Cryptage/Decryptage de String

Version imprimable

Bonjour,

En fait je cherche à faire quelque chose d'assez simple.
J'aimerais crypter de manière asymétrique une chaine de caractère sur un serveur, puis sur un autre serveur (poscédant la clé publique correspondante), décrypter cette meme chaine à l'intérieur d'une JSP ou autre.

J'ai trouvé cette méthode pour crypter/decrypter un fichier apres avoir générer le duo-clé publique/clé privé proposée par Razgriz ici

Code:

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/*
 * RSAEncryptor.java
 *
 * Created on 17 juin 2006, 15:58
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */
 
package Security;
 
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
 
/**
 *
 * @author Absil Romain
 */
public class RSAEncryptor
{
 
    /**
     * Generate a pair of key, write the public in publicOutputFileName and the
     * private in privateOutputFileName.
     * @param publicOutputFileName the file where the public key is written in.
     * @param privateOutputFileName the file where the private key is written in.
     **/
    public static void generateKeys(String publicInputFileName, 
            String privateOutputFileName)
    {
        try
        {
            KeyPairGenerator pairgen = KeyPairGenerator.getInstance("RSA");
            SecureRandom random = new SecureRandom();
            pairgen.initialize(2048, random);
            KeyPair keyPair = pairgen.generateKeyPair();
 
            ObjectOutputStream out = new ObjectOutputStream(
                    new FileOutputStream(publicInputFileName));
            out.writeObject(keyPair.getPublic());
            out.close();
 
            out = new ObjectOutputStream(
                    new FileOutputStream(privateOutputFileName));
            out.writeObject(keyPair.getPrivate());
            out.close();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
 
    /**
     * Encrytps the file inputFileName and saves the result in the file 
     * outputFileName, with the specified key keyFileName.
     * @param inputFileNane the file to encrypt.
     * @param outputFileName the file to save the encrypting result in.
     * @param keyFileName the key to use to encrypt the file.
     **/
    public static void encryptFile(String inputFileName, String outputFileName, 
            String keyFileName)
    {
        try
        {
            KeyGenerator keygen = KeyGenerator.getInstance("AES");
            SecureRandom random = new SecureRandom();
            keygen.init(random);
            SecretKey key = keygen.generateKey();
 
            //emballe avec la clé publique RSA
            ObjectInputStream keyIn = new ObjectInputStream(
                    new FileInputStream(keyFileName));
            Key publicKey = (Key)keyIn.readObject();
            keyIn.close();
 
            Cipher cipher = Cipher.getInstance("RSA");            
            cipher.init(Cipher.WRAP_MODE, publicKey);
            byte[] wrappedKey = cipher.wrap(key);
            DataOutputStream out = new DataOutputStream(
                    new FileOutputStream(outputFileName));
            out.writeInt(wrappedKey.length);
            out.write(wrappedKey);
 
            InputStream in = new FileInputStream(inputFileName);
            cipher = cipher.getInstance("AES");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            crypt(in, out, cipher);
            in.close();
            out.close();
        } 
 
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
 
    /**
     * Decrytps the file inputFileName and saves the result in the file 
     * outputFileName, with the specified key keyFileName.
     * @param inputFileName the file to decrypt.
     * @param outputFileName the file to save the decrypting result in.
     * @param keyFileName the key to use to decrypt the file.
     **/
    public static void decryptFile(String inputFileName, String outputFileName, 
            String keyFileName)
    {
        try
        {
            DataInputStream in = new DataInputStream(
                    new FileInputStream(inputFileName));
            int length = in.readInt();
            byte[] wrappedKey = new byte[length];
            in.read(wrappedKey, 0, length);
 
            //déballe avec la clé RSA
            ObjectInputStream keyIn = new ObjectInputStream(
                    new FileInputStream(keyFileName));
            Key privateKey = (Key)keyIn.readObject();
            keyIn.close();
 
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.UNWRAP_MODE, privateKey);
            Key key = cipher.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);
 
            OutputStream out = new FileOutputStream(outputFileName);
            cipher = cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, key);
 
            crypt(in, out, cipher);
            in.close();
            out.close();            
        } 
        catch (Exception ex)
        {
            ex.printStackTrace();
        }
 
    }
 
    private static void crypt(InputStream in, OutputStream out, Cipher cipher)
        throws IOException, GeneralSecurityException
    {
        int blockSize = cipher.getBlockSize();
        int outputSize = cipher.getOutputSize(blockSize);
        byte[] inBytes = new byte[blockSize];
        byte[] outBytes = new byte[outputSize];
 
        int inLength = 0;
        boolean done = false;
        while(!done)
        {
            inLength = in.read(inBytes);
            if(inLength == blockSize)
            {
                int outLength = cipher.update(inBytes, 0, blockSize, outBytes);
                out.write(outBytes, 0, outLength);
            }
            else
                done = true;
        }
 
        if(inLength > 0)
            outBytes = cipher.doFinal(inBytes, 0, inLength);
        else
            outBytes = cipher.doFinal();
        out.write(outBytes);
    }
}

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//Génération de clés : 
        RSAEncryptor.generateKeys("public key.key","private key.key");
 
        //Encryptage
	RSAEncryptor.encryptFile("The Chronicles Of Narnia.avi","Encrypt.encrypt","public key.key");
 
        //Décryptage
	RSAEncryptor.decryptFile("Encrypt.encrypt","Chronicles 2.avi"

Merci pour vos suggestions.

Aswat

21/06/2007, 11h23
Razgriz

Tu utilise la méthode getBytes() de la classe String, ça te renvoie un tableau de bytes et tu passe ça au cipher. Pour décrypter tu fait new String (decryptedbytes) et ça va mercher.

Sinon beaucoup plus simple : j'ai posté une autre classe sympatique quicrypte bien (un stream de cryptage), elle se trouev ici.

Y a l'input stream et l'output stream.
Note : une amélioration serait d'écrire la clé AES en début de fichier crypté. Pour décryptae, il suffit de la décrypter avec la RSA et ensuite de décrypter le reste du fichier avec la clé AES.

Tu n'as qu'à faire stream.writeObject(monString) et a marche.
21/06/2007, 11h43
aswat

Citation:

Envoyé par Razgriz

Tu utilise la méthode getBytes() de la classe String, ça te renvoie un tableau de bytes et tu passe ça au cipher. Pour décrypter tu fait new String (decryptedbytes) et ça va mercher.

Sinon beaucoup plus simple : j'ai posté une autre classe sympatique quicrypte bien (un stream de cryptage), elle se trouev ici.

Y a l'input stream et l'output stream.
Note : une amélioration serait d'écrire la clé AES en début de fichier crypté. Pour décryptae, il suffit de la décrypter avec la RSA et ensuite de décrypter le reste du fichier avec la clé AES.

Tu n'as qu'à faire stream.writeObject(monString) et a marche.

Attend je ne suis pas sur que tu est compris ce que je cherche a faire. :roll: En fait j'aimerais balader une chaine de caractère dans un cookie. Cette chaine doit être cryptée et décryptée. Les solutions que tu m'indiques semblent s'orienter vers le cryptage/décryptage de fichiers ce qui ne me sert pas vraiment. Il faudrait que j'utilise pour cela une clé coté serveur 1 et une autre clé coté appli (serveur 2) pour décoder. :?

Je suis un peu paumé....

j'ai une classe qui fait presque ce que je veux. En fait j'aimerais remplacer le cryptage symétrique par un cryptage asymétrique. Et surtout j'aimerais pouvoir avoir une clé privé sur le serveur qui crypte et une clé publique sur le serveur qui decrypte

Code:

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package com.atosorigin.opiam.auth.cas.security;
 
import java.io.UnsupportedEncodingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
 
public class Encryption {
	Cipher ecipher;
    Cipher dcipher;
 
    public Encryption(SecretKey key) {
    	try {
            ecipher = Cipher.getInstance("DES");
            dcipher = Cipher.getInstance("DES");
            ecipher.init(Cipher.ENCRYPT_MODE, key);
            dcipher.init(Cipher.DECRYPT_MODE, key);
 
        } catch (javax.crypto.NoSuchPaddingException e) {
        } catch (java.security.NoSuchAlgorithmException e) {
        } catch (java.security.InvalidKeyException e) {
        }
    }
 
    /**
     * @param str
     * @return
     */
    public String encrypt(String str) {
        try {
            // Encode the string into bytes using utf-8
            byte[] utf8 = str.getBytes("UTF8");
 
            // Encrypt
            byte[] enc = ecipher.doFinal(utf8);
 
            // Encode bytes to base64 to get a string
            return new sun.misc.BASE64Encoder().encode(enc);
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        }
        return null;
    }
 
    /**
     * @param str
     * @return
     */
    public String decrypt(String str) {
        try {
            // Decode base64 to get bytes
            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
 
            // Decrypt
            byte[] utf8 = dcipher.doFinal(dec);
 
            // Decode using utf-8
            return new String(utf8, "UTF8");
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        } catch (java.io.IOException e) {
        }
        return null;
    }
}

bon j'ai généré un couple de clé avec OpenSSL de cette manière :

Code:

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openssl genrsa -out private.der 2048 
openssl rsa -in private.der -pubout -outform DER -out public.der

ensuite j'essaye d'utiliser ma clé privé pour chiffrer :

Code:

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package com.atosorigin.opiam.auth.cas.security;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
 
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
 
public class Main {
 
	/**
         * @param args
         */
	public static void main(String[] args) {
 
		String passwordEnClair = "motDePasse";
		String passwordCrypte = "vide";
		File keyFile = new File("private.der");
		byte[] encodedKey = new byte[(int)keyFile.length()];
 
		try {
			new FileInputStream(keyFile).read(encodedKey);
		} catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
 
		PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedKey);
 
		KeyFactory kf;
		try {
			kf = KeyFactory.getInstance("RSA");
			PrivateKey pk;
			try {
				pk = kf.generatePrivate(privateKeySpec);
			} catch (InvalidKeySpecException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
			Cipher rsa;
 
			try {
				rsa = Cipher.getInstance("RSA");
 
				try {
	                // Encode the string into bytes using utf-8
	                byte[] utf8 = passwordEnClair.getBytes("UTF8");
 
	                // Encrypt
	                byte[] enc = rsa.doFinal(utf8);
 
	                // Encode bytes to base64 to get a string
	                passwordCrypte = new sun.misc.BASE64Encoder().encode(enc);
	            } catch (javax.crypto.BadPaddingException e) {
	            } catch (IllegalBlockSizeException e) {
	            } catch (UnsupportedEncodingException e) {
	            }
			} catch (NoSuchAlgorithmException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			} catch (NoSuchPaddingException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
 
		} catch (NoSuchAlgorithmException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		System.out.println(passwordCrypte);
	}
}

mais j'obtient cette erreur :

Code:

java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: invalid key format

Quelqun a déjàs essayé de faire ceci ?

Bon j'y suis presque, le cryptage fonctionne mais j'arrive pas a utiliser ma clé privé pour décrypter ...

Code:

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package com.atosorigin.opiam.auth.cas.security;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
 
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
 
public class Main {
 
	/**
         * @param args
         */
	public static void main(String[] args) {
 
		String passwordEnClair = "motDePasse";
		String passwordCrypte = "vide";
		String passwordDeCrypte = "vide";
 
		File publicKeyFile = new File("public2.der");
		byte[] encodedPublicKey = new byte[(int)publicKeyFile.length()];
 
		try {
			new FileInputStream(publicKeyFile).read(encodedPublicKey);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
		X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(encodedPublicKey);
 
		KeyFactory kf;
		try {
			kf = KeyFactory.getInstance("RSA");
			PublicKey pk;
			try {
				pk = kf.generatePublic(publicKeySpec);
				Cipher rsa;
				try {
					rsa = Cipher.getInstance("RSA");
					try {
						rsa.init(Cipher.ENCRYPT_MODE, pk);
					} catch (InvalidKeyException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					try {
			            // Encode the string into bytes using utf-8
			            byte[] utf8 = passwordEnClair.getBytes("UTF8");
 
			            // Encrypt
			            byte[] enc = rsa.doFinal(utf8);
 
			            // Encode bytes to base64 to get a string
			            passwordCrypte =  new sun.misc.BASE64Encoder().encode(enc);
			        } catch (javax.crypto.BadPaddingException e) {
			        } catch (IllegalBlockSizeException e) {
			        } catch (UnsupportedEncodingException e) {
			        }
				} catch (NoSuchAlgorithmException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (NoSuchPaddingException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			} catch (InvalidKeySpecException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(passwordCrypte);
 
		//************************************************************************
		//Décryptage
		//************************************************************************
 
		File privateKeyFile = new File("private2.pem");
		byte[] encodedPrivateKey = new byte[(int)privateKeyFile.length()];
 
		try {
			new FileInputStream(privateKeyFile).read(encodedPrivateKey);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
		PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedPrivateKey);
 
		KeyFactory kf2;
		try {
			kf2 = KeyFactory.getInstance("RSA");
			PrivateKey pk2;
			try {
				pk2 = kf2.generatePrivate(privateKeySpec);
				Cipher rsa2;
				try {
					rsa2 = Cipher.getInstance("RSA");
					try {
						rsa2.init(Cipher.DECRYPT_MODE, pk2);
					} catch (InvalidKeyException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					try {
			            // Decode base64 to get bytes
			            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(passwordCrypte);
 
			            // Decrypt
			            byte[] utf8 = rsa2.doFinal(dec);
 
			            // Decode using utf-8
			            passwordDeCrypte = new String(utf8, "UTF8");
			        } catch (javax.crypto.BadPaddingException e) {
			        } catch (IllegalBlockSizeException e) {
			        } catch (UnsupportedEncodingException e) {
			        } catch (java.io.IOException e) {
			        }
 
				} catch (NoSuchAlgorithmException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (NoSuchPaddingException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			} catch (InvalidKeySpecException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println("**********\nInitial: " + passwordEnClair + "\nCrypté: " + passwordCrypte + "\nDécrypté: " + passwordDeCrypte);
 
	}
}

Par contre j'ai une exception :

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java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: invalid key format
	at sun.security.rsa.RSAKeyFactory.engineGeneratePrivate(RSAKeyFactory.java:175)
	at java.security.KeyFactory.generatePrivate(KeyFactory.java:322)
	at com.atosorigin.opiam.auth.cas.security.Main.main(Main.java:116)
Caused by: java.security.InvalidKeyException: invalid key format
	at sun.security.pkcs.PKCS8Key.decode(PKCS8Key.java:324)
	at sun.security.pkcs.PKCS8Key.decode(PKCS8Key.java:350)
	at sun.security.rsa.RSAPrivateCrtKeyImpl.<init>(RSAPrivateCrtKeyImpl.java:74)
	at sun.security.rsa.RSAPrivateCrtKeyImpl.newKey(RSAPrivateCrtKeyImpl.java:58)
	at sun.security.rsa.RSAKeyFactory.generatePrivate(RSAKeyFactory.java:274)
	at sun.security.rsa.RSAKeyFactory.engineGeneratePrivate(RSAKeyFactory.java:171)
	... 2 more

Je comprend pas j'ai du me planter quelque part .... cette fois-ci j'ai testé en créant les clés de deux manières différentes :

Code:

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openssl genrsa -out private.der 2048 
openssl rsa -in private.der -pubout -outform DER -out public.der

Code:

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openssl genrsa -out private2.pem 2048 
openssl rsa -in private2.pem -pubout -outform DER -out public2.der

Quelqun pour m'aider ??

aswat

21/06/2007, 19h37
Razgriz

C'est tout à fait normal.

Les clés RSA en gros contiennt des nombres, en java le fichier est évrit d'une certaine manoère (sérialisation) et ton logiciel le fait d'une autre manière. Donc évidement la clé de ton logiciel n'est pas reconnue comme une clé par mon programme. Utilise generateKeys de mon code pour le faire.

D'accord c'est pas super POO comme classe, c'était un des premiers modèles pour voir si ça fonctionnait, j'ai une belle classe bien faite si tu veux mais tout est là sinon.
22/06/2007, 08h53
aswat

Non tinquiete pas je n'ais pas la prétention de coder POO comme un pro, loing de là. Je voulais juste essayer de passer par un outil externe pour générer les clés mais c'est pas indispensable pour moi. Je vais essayer avec ta methode.
Par contre ce que je ne comprend pas c'est que la clé "publique" est bien lue par mon programme, seule la clé privé ne l'est pas. Sinon, pour la manière dont je lit ces clés tu vois un truc qui cloche ??

je veux bien voir ta classe bien faite par curiosité et surtout pour apprendre, merci.

aswat

En fait ca ne marche pas, du coup mon programme ne lit aucune des deux clés. Je m'explique j'appel ta methode generateKeys puis je les utilisent dans mon programme. J'ai une erreur :

Code:

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java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException: DerInputStream.getLength(): lengthTag=109, too big.
	at sun.security.rsa.RSAKeyFactory.engineGeneratePublic(RSAKeyFactory.java:163)
	at java.security.KeyFactory.generatePublic(KeyFactory.java:284)
	at com.atosorigin.opiam.auth.cas.security.Main.crypt(Main.java:72)
	at com.atosorigin.opiam.auth.cas.security.Main.main(Main.java:40)
Caused by: java.security.InvalidKeyException: IOException: DerInputStream.getLength(): lengthTag=109, too big.
	at sun.security.x509.X509Key.decode(X509Key.java:380)
	at sun.security.x509.X509Key.decode(X509Key.java:386)
	at sun.security.rsa.RSAPublicKeyImpl.<init>(RSAPublicKeyImpl.java:65)
	at sun.security.rsa.RSAKeyFactory.generatePublic(RSAKeyFactory.java:256)
	at sun.security.rsa.RSAKeyFactory.engineGeneratePublic(RSAKeyFactory.java:159)

voici le code en entier :

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package com.atosorigin.opiam.auth.cas.security;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
 
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
 
public class Main {
 
	/**
         * @param args
         */
	public static void main(String[] args) {
 
		String passwordEnClair = "motDePasse";
		String passwordCrypte = "vide";
		String passwordDeCrypte = "vide";
		//************************************************************************
		//Génération des clés
		//************************************************************************
		RSAEncryptor.generateKeys("encryptionKey.key","decryptionKey.key");
 
		System.out.println("Initial: " + passwordEnClair);
		//************************************************************************
		//Cryptage
		//************************************************************************
		passwordCrypte = crypt(passwordEnClair);
		System.out.println("Crypté: " + passwordCrypte);
		//************************************************************************
		//Décryptage
		//************************************************************************
		passwordDeCrypte = decrypt(passwordCrypte);
		System.out.println("Décrypté: " + passwordDeCrypte);
 
	}
 
	private static String crypt(String passwordEnClair)
	{
		File encryptionKeyFile = new File("encryptionKey.key");
		byte[] encodedEncryptionKey = new byte[(int)encryptionKeyFile.length()];
 
		try {
			new FileInputStream(encryptionKeyFile).read(encodedEncryptionKey);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
		X509EncodedKeySpec encryptionKeySpec = new X509EncodedKeySpec(encodedEncryptionKey);
 
		KeyFactory kf;
		try {
			kf = KeyFactory.getInstance("RSA");
			PublicKey pk;
			try {
				pk = kf.generatePublic(encryptionKeySpec);
				Cipher rsa;
				try {
					rsa = Cipher.getInstance("RSA");
					try {
						rsa.init(Cipher.ENCRYPT_MODE, pk);
					} catch (InvalidKeyException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					try {
			            // Encode the string into bytes using utf-8
			            byte[] utf8 = passwordEnClair.getBytes("UTF8");
 
			            // Encrypt
			            byte[] enc = rsa.doFinal(utf8);
 
			            // Encode bytes to base64 to get a string
			            return new sun.misc.BASE64Encoder().encode(enc);
			        } catch (javax.crypto.BadPaddingException e) {
			        } catch (IllegalBlockSizeException e) {
			        } catch (UnsupportedEncodingException e) {
			        }
				} catch (NoSuchAlgorithmException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (NoSuchPaddingException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			} catch (InvalidKeySpecException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
 
	private static String decrypt(String passwordCrypte)
	{
		File privateKeyFile = new File("decryptionKey.key");
		byte[] encodedPrivateKey = new byte[(int)privateKeyFile.length()];
 
		try {
			new FileInputStream(privateKeyFile).read(encodedPrivateKey);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
		X509EncodedKeySpec privateKeySpec = new X509EncodedKeySpec(encodedPrivateKey);
 
		KeyFactory kf2;
		try {
			kf2 = KeyFactory.getInstance("RSA");
			PrivateKey pk2;
			try {
				pk2 = kf2.generatePrivate(privateKeySpec);
				Cipher rsa2;
				try {
					rsa2 = Cipher.getInstance("RSA");
					try {
						rsa2.init(Cipher.DECRYPT_MODE, pk2);
					} catch (InvalidKeyException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					try {
			            // Decode base64 to get bytes
			            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(passwordCrypte);
 
			            // Decrypt
			            byte[] utf8 = rsa2.doFinal(dec);
 
			            // Decode using utf-8
			            return new String(utf8, "UTF8");
			        } catch (javax.crypto.BadPaddingException e) {
			        } catch (IllegalBlockSizeException e) {
			        } catch (UnsupportedEncodingException e) {
			        } catch (java.io.IOException e) {
			        }
 
				} catch (NoSuchAlgorithmException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (NoSuchPaddingException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			} catch (InvalidKeySpecException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
}

Ca plante a cette instruction :

pk = kf.generatePublic(encryptionKeySpec);

J'aurais pas oublié un paramètre ?

Bon ben c'a y est j'y suis parvenu.
ci-joint ma classe:

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package com.atosorigin.opiam.auth.cas.security;
 
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
 
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
 
public class Main {
 
	/**
         * @param args
         */
	public static void main(String[] args) {
 
		String passwordEnClair = "motDePasse";
		String passwordCrypte = "vide";
		String passwordDeCrypte = "vide";
		//************************************************************************
		//Génération des clés
		//************************************************************************
		//RSAEncryptor.generateKeys("encryptionKey.key","decryptionKey.key");
 
		System.out.println("Initial: " + passwordEnClair);
		//************************************************************************
		//Cryptage
		//************************************************************************
		passwordCrypte = crypt(passwordEnClair);
		System.out.println("Crypté: " + passwordCrypte);
		//************************************************************************
		//Décryptage
		//************************************************************************
		passwordDeCrypte = decrypt(passwordCrypte);
		System.out.println("Décrypté: " + passwordDeCrypte);
 
	}
 
	private static String crypt(String passwordEnClair)
	{
		//	emballe avec la clé publique RSA
        ObjectInputStream keyIn;
		try {
			keyIn = new ObjectInputStream(new FileInputStream("encryptionKey.key"));
			Key encryptionKey;
			try {
				encryptionKey = (Key)keyIn.readObject();
				Cipher rsa;
				try {
					rsa = Cipher.getInstance("RSA");
					try {
						rsa.init(Cipher.ENCRYPT_MODE, encryptionKey);
						byte[] utf8 = passwordEnClair.getBytes("UTF8");
 
						// Encrypt
						byte[] enc;
						try {
							enc = rsa.doFinal(utf8);
							// Encode bytes to base64 to get a string
							return new sun.misc.BASE64Encoder().encode(enc);
 
						} catch (IllegalBlockSizeException e) {
							e.printStackTrace();
						} catch (BadPaddingException e) {
							e.printStackTrace();
						}
					} catch (InvalidKeyException e) {
						e.printStackTrace();
					}
				} catch (NoSuchAlgorithmException e) {
					e.printStackTrace();
				} catch (NoSuchPaddingException e) {
					e.printStackTrace();
				}
			} catch (IOException e) {
				e.printStackTrace();
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}
			keyIn.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}
 
	private static String decrypt(String passwordCrypte)
	{
		//	déballe de la clé privé RSA
        ObjectInputStream keyIn;
		try {
			keyIn = new ObjectInputStream(new FileInputStream("decryptionKey.key"));
			Key decryptionKey;
			try {
				decryptionKey = (Key)keyIn.readObject();
				Cipher rsa;
				try {
					rsa = Cipher.getInstance("RSA");
					try {
						rsa.init(Cipher.DECRYPT_MODE, decryptionKey);
						//	Decode base64 to get bytes
				        byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(passwordCrypte);
 
				        // Decrypt
				        byte[] utf8 = rsa.doFinal(dec);
				        // Decode using utf-8
				        return new String(utf8, "UTF8");
 
					} catch (InvalidKeyException e) {
						e.printStackTrace();
					} catch (IllegalBlockSizeException e) {
						e.printStackTrace();
					} catch (BadPaddingException e) {
						e.printStackTrace();
					}
				} catch (NoSuchAlgorithmException e) {
					e.printStackTrace();
				} catch (NoSuchPaddingException e) {
					e.printStackTrace();
				}
			} catch (IOException e) {
				e.printStackTrace();
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}
			keyIn.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}
}

Si vous avez des suggestions pour améliorer tout ca, je suis preneur.

aswat

Pour info, voivi la classe d'encryption RSA bien faite.

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/*
 * RSAEncryptor.java
 *
 * Created on 17 juin 2006, 15:58
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */
 
package org.umh.crypto;
 
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.InvalidParameterException;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.ShortBufferException;
import javax.crypto.BadPaddingException;
 
/**
 * This class provides methods for generate keys, encrypt or decrypt files and
 * streams with the RSA crypting algorithm.
 * @author Absil Romain
 */
public class RSAEncryptor implements CipherEncryptor
{
    private Key publicKey;
    private Key privateKey;
    private boolean isEncryptInitialized;
    private boolean isDecryptInitialized;
 
    /**
     * Constructs a new RSA encryptor with the specified file containing one 
     * of the keys, in encrypt or decrypt mode (depends on the type of stored
     * key, if the key is public, then the encryptor is in encrypt mode,
     * otherwise it is in decrypt mode.
     * @param keyFileName the name of the file containing a RSA key.
     * @throws java.io.FileNotFoundException if the file containing the key doesn't
     * exist.
     * @throws java.io.IOException if an error occurs during reading the file 
     * containing the key.
     * @throws java.lang.ClassNotFoundException if the class of the key is unknown.
     * @throws java.security.InvalidKeyException is the stored key is not a valid type of key.
     */
    public RSAEncryptor(String keyFileName) 
        throws FileNotFoundException, IOException, ClassNotFoundException, 
            InvalidKeyException
    {
        ObjectInputStream keyIn = new ObjectInputStream(
                new FileInputStream(keyFileName));
        Object key = keyIn.readObject();
        keyIn.close();
 
        if(key instanceof PublicKey)
        {
            publicKey = (Key)key;
            isEncryptInitialized = true;
        }
        else if(key instanceof PrivateKey)
        {
            privateKey = (Key)key;
            isDecryptInitialized = true;
        }
        else
            throw new InvalidKeyException("The file does not contain a " +
                    "valid key");
    }
 
    /**
     * Constructs a new RSA encryptor with the specified file containing one 
     * of the keys, in encrypt or decrypt mode (depends on the type of stored
     * key, if the key is public, then the encryptor is in encrypt mode,
     * otherwise it is in decrypt mode.
     * @param keyFile the file containing a RSA key.
     * @throws java.io.FileNotFoundException if the file containing the key doesn't
     * exist.
     * @throws java.io.IOException if an error occurs during reading the file 
     * containing the key.
     * @throws java.lang.ClassNotFoundException if the class of the key is unknown.
     * @throws java.security.InvalidKeyException is the stored key is not a valid type of key.
     */
    public RSAEncryptor(File keyFile) 
        throws FileNotFoundException, IOException, ClassNotFoundException, InvalidKeyException
    {
        ObjectInputStream keyIn = new ObjectInputStream(
                new FileInputStream(keyFile));
        Object key = keyIn.readObject();
        keyIn.close();
 
        if(key instanceof PublicKey)
        {
            publicKey = (Key)key;
            isEncryptInitialized = true;
        }
        else if(key instanceof PrivateKey)
        {
            privateKey = (Key)key;
            isDecryptInitialized = true;
        }
        else
            throw new InvalidKeyException("The file does not contain a " +
                    "valid key");
    }
 
    /**
     * Constructs a new RSA encryptor in encrypt mode with the specified
     * public key.
     * @param key the public key (used to encrypt files and streams).
     **/
    public RSAEncryptor(PublicKey key)
    {
        this.publicKey = key;
        this.isEncryptInitialized = true;
    }
 
    /**
     * Constructs a new RSA encryptor in decrypt mode with the specified
     * private key.
     * @param key the private key (used to decrypt files and streams).
     **/
    public RSAEncryptor(PrivateKey key)
    {
        this.privateKey = key;
        this.isDecryptInitialized = true;
    }
 
    /**
     * Constructs a new RSA encryptor in encrypt and decrypt mode with the
     * specified files containing the public and private key.
     * @param publicKeyFileName the name of the file containing the public key.
     * @param privateKeyFileName the name of the file containing the private key.
     * @throws java.io.FileNotFoundException if one of the files containing a key 
     * doen't exist.
     * @throws java.io.IOException if an error occurs during reading one of the keys.
     * @throws java.lang.ClassNotFoundException if one of the class of the keys is
     * unknown.
     * @throws java.security.InvalidKeyException if the files containing the keys don't
     * contain valid keys.
     */
    public RSAEncryptor(String publicKeyFileName, String privateKeyFileName) 
        throws FileNotFoundException, IOException, ClassNotFoundException,
            InvalidKeyException
    {
        ObjectInputStream keyIn = new ObjectInputStream(
                new FileInputStream(publicKeyFileName));
        Object puKey = keyIn.readObject();
        keyIn.close();
 
        keyIn = new ObjectInputStream(
                new FileInputStream(privateKeyFileName));
        Object prKey = keyIn.readObject();
        keyIn.close();
 
        if(puKey instanceof PublicKey && prKey instanceof PrivateKey)
        {
            this.publicKey = (Key)puKey;
            this.isEncryptInitialized = true;
            this.privateKey = (Key)prKey;
            this.isDecryptInitialized = true;
        }
        else
            throw new InvalidKeyException("Some of the files don't contains" +
                    " a valid key");
    }
 
    /**
     * Constructs a new RSA encryptor in encrypt and decrypt mode with the
     * specified files containing the public and private key.
     * @param publicKeyFile the file containing the public key.
     * @param privateKeyFile the file containing the private key.
     * @throws java.io.FileNotFoundException if one of the files containing a key 
     * doen't exist.
     * @throws java.io.IOException if an error occurs during reading one of the keys.
     * @throws java.lang.ClassNotFoundException if one of the class of the keys is
     * unknown.
     */
    public RSAEncryptor(File publicKeyFile, File privateKeyFile) 
        throws FileNotFoundException, IOException, ClassNotFoundException
    {
        ObjectInputStream keyIn = new ObjectInputStream(
                new FileInputStream(publicKeyFile));
        this.publicKey = (Key) keyIn.readObject();
        this.isEncryptInitialized = true;
        keyIn.close();
 
        keyIn = new ObjectInputStream(
                new FileInputStream(privateKeyFile));
        this.privateKey = (Key) keyIn.readObject();
        this.isDecryptInitialized = true;
        keyIn.close();
    }
 
    /**
     * Construct a new RSA encryptor in encrypt and decrypt mode with the
     * specified public and private key.
     * @param publicKey the public key (used to encrypt files and streams).
     * @param privateKey the private key (used to decrypt files and streams).
     **/
    public RSAEncryptor(PublicKey publicKey, PrivateKey privateKey)
    {
        this.publicKey = publicKey;
        this.isEncryptInitialized = true;
        this.privateKey = privateKey;
        this.isDecryptInitialized = true;
    }
 
    /**
     * Construct a new RSA encryptor in encrypt and decrypt mode with the
     * specified pair of keys.
     * @param keyPair the pair of keys used to encrypt and decrypt files and
     * streams.
     **/
    public RSAEncryptor(KeyPair keyPair)
    {
        this(keyPair.getPublic(), keyPair.getPrivate());
    }
 
    /**
     * Returns the public key of the underlying encryptor.
     * @return the public key of the underlying encryptor.
     **/
    public PublicKey getPublicKey()
    {
        return (PublicKey) publicKey;
    }
 
    /**
     * Sets the public key of the underlying encryptor.
     * @param key the public key to set.
     **/
    public void setPublicKey(PublicKey key)
    {
        this.publicKey = key;
    }
 
    /**
     * Returns the private key of the underlying encryptor.
     * @return the private key of the underlying encryptor.
     **/
    public PrivateKey getPrivateKey()
    {
        return (PrivateKey) privateKey;
    }
 
    /**
     * Returns a new instance of RSAEncryptor with the specified size for
     * generated keys.
     * @param size the size of the generated keys.
     * @return a new instance of RSAEncryptor.
     **/
    public static RSAEncryptor getInstance(int size)
    {
        return new RSAEncryptor(generateKeys(size));
    }
 
    /**
     * Returns a new instance of RSAEncryptor with the specified size for
     * generated keys and writes them into the specified files.
     * @return a new instance of RSAEncryptor.
     * @param size the size of the generated keys.
     * @param publicKeyFileName the name of the file in wich youw ant to write
     * the public key.
     * @param privateKeyFileName the name of the file in wich youw ant to write
     * the private key.
     * @throws java.io.IOException if an error occurs during writing one of the keys.
     */
    public static RSAEncryptor getInstance(int size, String publicKeyFileName,
            String privateKeyFileName) throws IOException
    {
        return new RSAEncryptor(generateAndSaveKeys(size, publicKeyFileName, privateKeyFileName));
    }
 
    /**
     * Returns a new instance of RSAEncryptor with the specified size for
     * generated keys and writes them into the specified files.
     * @return a new instance of RSAEncryptor.
     * @param size the size of the generated keys.
     * @param publicKeyFile the file in wich youw ant to write the public key.
     * @param privateKeyFile the file in wich youw ant to write the private key.
     * @throws java.io.IOException if an error occurs during writing one of the keys.
     */
    public static RSAEncryptor getInstance(int size, File publicKeyFile, 
            File privateKeyFile) throws IOException
    {
        return new RSAEncryptor(generateAndSaveKeys(size, publicKeyFile, privateKeyFile));
    }
 
    /**
     * Returns a pair of keys generated with the specified size.
     * @return a pair of keys generated with the specified size.
     * @param size the size of the generated key.
     */
    public static KeyPair generateKeys(int size)
    {
        KeyPairGenerator pairgen = null;
        try
        {
            pairgen = KeyPairGenerator.getInstance("RSA");
        } 
        catch (NoSuchAlgorithmException ex)//never launched
        {
            ex.printStackTrace();
        }
        SecureRandom random = new SecureRandom();
        pairgen.initialize(size, random);
        KeyPair keyPair = pairgen.generateKeyPair();
        return keyPair;
    }
 
    /**
     * Returns a pair of keys generated with the specified size and writes 
     * them into the specified files.
     * @param size the size of the generated keys.
     * @param publicKeyFileName the name of the file in wich youw ant to write
     * the public key.
     * @param privateKeyFileName the name of the file in wich youw ant to write
     * the private key.
     * @return a pair of keys with the specified size.
     * @throws java.io.IOException if an error occurs during writing the keys.
     **/
    public static KeyPair generateAndSaveKeys(int size, String publicKeyFileName, 
            String privateKeyFileName) throws IOException
    {
        KeyPair keyPair = generateKeys(size);
 
        ObjectOutputStream out = new ObjectOutputStream(
                new FileOutputStream(publicKeyFileName));
        out.writeObject(keyPair.getPublic());
        out.close();
 
        out = new ObjectOutputStream(
                new FileOutputStream(privateKeyFileName));
        out.writeObject(keyPair.getPrivate());
        out.close();
 
        return keyPair;
    }
 
    /**
     * Returns a pair of keys generated with the specified size and writes 
     * them into the specified files.
     * @param size the size of the generated keys.
     * @param publicKeyFile the file in wich you want to write the public key.
     * @param privateKeyFile the file in wich you want to write the private key.
     * @return a pair of keys with the specified size.
     * @throws java.io.IOException if an error occurs during writing the keys.
     **/
    public static KeyPair generateAndSaveKeys(int size, File publicKeyFile, 
            File privateKeyFile) throws IOException
    {
        KeyPair keyPair = generateKeys(size);
 
        ObjectOutputStream out = new ObjectOutputStream(
                new FileOutputStream(publicKeyFile));
        out.writeObject(keyPair.getPublic());
        out.close();
 
        out = new ObjectOutputStream(
                new FileOutputStream(privateKeyFile));
        out.writeObject(keyPair.getPrivate());
        out.close();
 
        return keyPair;
    }

La suite au prochain post(sinon ça plante...)

La suite donc :

Code:

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/**
     * Encrypts the specified input file to the specified output file.
     * @param inputFileName the name of the file to encrypt.
     * @param outputFileName the name of the file where you want to write 
     * the encrypted file.
     * @throws java.io.FileNotFoundException if the file to encrypt doesn't
     * exist.
     * @throws java.io.IOException if an error occurs during writing encrypted
     * datas.
     * @throws java.security.InvalidKeyException if the key is not valid for
     * this type of operation.
     * @throws javax.crypto.IllegalBlockSizeException if the cipher is a block
     * cipher, no padding has been requested, and the length of the encoding
     * of the key to be wrapped is not a multiple of the block size.
     */
    public void encryptFile(String inputFileName, String outputFileName) 
        throws InvalidKeyException, IllegalBlockSizeException, 
            FileNotFoundException, IOException
    {
        if(!this.isEncryptInitialized)
            throw new IllegalStateException("The underlying encryptor is not" +
                    " initialized in encrypt mode. You must specify a " +
                    "public key.");
        KeyGenerator keygen = null;
        Cipher cipherRsa = null;
        Cipher cipherAes= null;
        try
        {
            keygen = KeyGenerator.getInstance("AES");
            cipherRsa = Cipher.getInstance("RSA");
            cipherAes = Cipher.getInstance("AES");
        }
        catch(NoSuchAlgorithmException e)//never launched
        {
            e.printStackTrace();
        }
        catch(NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
        SecureRandom random = new SecureRandom();
        keygen.init(random);
        SecretKey key = keygen.generateKey();
 
        cipherRsa.init(Cipher.WRAP_MODE, publicKey);
        byte[] wrappedKey = cipherRsa.wrap(key);
        DataOutputStream out = new DataOutputStream(
                new FileOutputStream(outputFileName));
        out.writeInt(wrappedKey.length);
        out.write(wrappedKey);
 
        InputStream in = new FileInputStream(inputFileName);
 
        cipherAes.init(Cipher.ENCRYPT_MODE, key);
        crypt(in, out, cipherAes);
        in.close();
        out.close();
    }
 
    /**
     * Encrypts the specified input file to the specified output file.
     * @param inputFile file to encrypt.
     * @param outputFile the file where you want to write the encrypted file.
     * @throws java.io.FileNotFoundException if the file to encrypt doesn't
     * exist.
     * @throws java.io.IOException if an error occurs during writing encrypted
     * datas.
     * @throws java.security.InvalidKeyException if the key is not valid for
     * this type of operation.
     * @throws javax.crypto.IllegalBlockSizeException if the cipher is a block
     * cipher, no padding has been requested, and the length of the encoding
     * of the key to be wrapped is not a multiple of the block size.
     */
    public void encryptFile(File inputFile, File outputFile)
        throws InvalidKeyException, IllegalBlockSizeException, 
            FileNotFoundException, IOException
    {
        if(!this.isEncryptInitialized)
            throw new IllegalStateException("The underlying encryptor is not" +
                    " initialized in encrypt mode. You must specify a " +
                    "public key.");
        KeyGenerator keygen = null;
        Cipher cipherRsa = null;
        Cipher cipherAes= null;
        try
        {
            keygen = KeyGenerator.getInstance("AES");
            cipherRsa = Cipher.getInstance("RSA");
            cipherAes = Cipher.getInstance("AES");
        }
        catch(NoSuchAlgorithmException e)//never launched
        {
            e.printStackTrace();
        }
        catch(NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
        SecureRandom random = new SecureRandom();
        keygen.init(random);
        SecretKey key = keygen.generateKey();
 
        cipherRsa.init(Cipher.WRAP_MODE, publicKey);
        byte[] wrappedKey = cipherRsa.wrap(key);
        DataOutputStream out = new DataOutputStream(
                new FileOutputStream(outputFile));
        out.writeInt(wrappedKey.length);
        out.write(wrappedKey);
 
        InputStream in = new FileInputStream(inputFile);
 
        cipherAes.init(Cipher.ENCRYPT_MODE, key);
        crypt(in, out, cipherAes);
        in.close();
        out.close();
    }
 
    /**
     * Decrypts the specified input file to the specified output file.
     * @param inputFileName the name of the file to decrypt.
     * @param outputFileName the name of the file where you want to write 
     * the decrypted file.
     * @throws java.io.FileNotFoundException if the file to decrypt doesn't
     * exist.
     * @throws java.io.IOException if an error occurs during writing decrypted
     * datas.
     * @throws java.security.InvalidKeyException if the key is not valid for
     * this type of operation.
     */
    public void decryptFile(String inputFileName, String outputFileName) 
        throws FileNotFoundException, IOException, InvalidKeyException
    {
        if(!this.isEncryptInitialized)
            throw new IllegalStateException("The underlying encryptor is not" +
                    " initialized in decrypt mode. You must specify a " +
                    "private key.");
        DataInputStream in = new DataInputStream(
                new FileInputStream(inputFileName));
        int length = in.readInt();
        byte[] wrappedKey = new byte[length];
        in.read(wrappedKey, 0, length);
        Cipher cipherRsa = null;
        Cipher cipherAes = null;
        Key key = null;
        try
        {
            cipherRsa = Cipher.getInstance("RSA");
            cipherAes = Cipher.getInstance("AES");
            cipherRsa.init(Cipher.UNWRAP_MODE, privateKey); 
            key = cipherRsa.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);
        }
        catch(NoSuchAlgorithmException e)//never thrown
        {
            e.printStackTrace();
        }
        catch(NoSuchPaddingException e)//never thrown
        {
            e.printStackTrace();
        }
 
        OutputStream out = new FileOutputStream(outputFileName);
        cipherAes.init(Cipher.DECRYPT_MODE, key);
 
        crypt(in, out, cipherAes);
        in.close();
        out.close();
    }
 
    /**
     * Decrypts the specified input file to the specified output file.
     * @param inputFile the file to decrypt.
     * @param outputFile the file where you want to write the decrypted file.
     * @throws java.io.FileNotFoundException if the file to decrypt doesn't
     * exist.
     * @throws java.io.IOException if an error occurs during writing decrypted
     * datas.
     * @throws java.security.InvalidKeyException if the key is not valid for
     * this type of operation.
     */
    public void decryptFile(File inputFile, File outputFile)
        throws FileNotFoundException, IOException, InvalidKeyException
    {
        if(!this.isEncryptInitialized)
            throw new IllegalStateException("The underlying encryptor is not" +
                    " initialized in decrypt mode. You must specify a " +
                    "private key.");
        DataInputStream in = new DataInputStream(
                new FileInputStream(inputFile));
        int length = in.readInt();
        byte[] wrappedKey = new byte[length];
        in.read(wrappedKey, 0, length);
        Cipher cipherRsa = null;
        Cipher cipherAes = null;
        Key key = null;
        try
        {
            cipherRsa = Cipher.getInstance("RSA");
            cipherAes = Cipher.getInstance("AES");
            cipherRsa.init(Cipher.UNWRAP_MODE, privateKey); 
            key = cipherRsa.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);
        }
        catch(NoSuchAlgorithmException e)//never thrown
        {
            e.printStackTrace();
        }
        catch(NoSuchPaddingException e)//never thrown
        {
            e.printStackTrace();
        }
 
        OutputStream out = new FileOutputStream(outputFile);
        cipherAes.init(Cipher.DECRYPT_MODE, key);
 
        crypt(in, out, cipherAes);
        in.close();
        out.close();
    }
 
    /**
     * Encrypts the specified input stream to the specified output stream.
     * @param in the stream to encrypt.
     * @param out the stream where you want to write the encrypted stream.
     * @throws java.io.IOException if an error occurs during writing encrypted
     * datas.
     * @throws java.security.InvalidKeyException if the key is not valid for
     * this type of operation.
     * @throws javax.crypto.IllegalBlockSizeException if the cipher is a block
     * cipher, no padding has been requested, and the length of the encoding
     * of the key to be wrapped is not a multiple of the block size.
     */
    public void encryptStream(InputStream in, OutputStream out) 
        throws InvalidKeyException, IllegalBlockSizeException, IOException
    {
        if(!this.isEncryptInitialized)
            throw new IllegalStateException("The underlying encryptor is not" +
                    " initialized in encrypt mode. You must specify a " +
                    "public key.");
        KeyGenerator keygen = null;
        Cipher cipherRsa = null;
        Cipher cipherAes= null;
        try
        {
            keygen = KeyGenerator.getInstance("AES");
            cipherRsa = Cipher.getInstance("RSA");
            cipherAes = Cipher.getInstance("AES");
        }
        catch(NoSuchAlgorithmException e)//never launched
        {
            e.printStackTrace();
        }
        catch(NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
        SecureRandom random = new SecureRandom();
        keygen.init(random);
        SecretKey key = keygen.generateKey();
 
        cipherRsa.init(Cipher.WRAP_MODE, publicKey);
        byte[] wrappedKey = cipherRsa.wrap(key);
 
        Integer length = wrappedKey.length;
        out.write(length.byteValue());
        out.write(wrappedKey);
 
        cipherAes.init(Cipher.ENCRYPT_MODE, key);
        crypt(in, out, cipherAes);
        in.close();
        out.close();
    }
 
    /**
     * Decrypts the specified input stream to the specified output stream.
     * @param in the stream to decrypt.
     * @param out the stream where you want to write the decrypted stream.
     * @throws java.io.IOException if an error occurs during writing encrypted
     * datas.
     * @throws java.security.InvalidKeyException if the key is not valid for
     * this type of operation.
     */
    public void decryptStream(InputStream in, OutputStream out) 
        throws IOException, InvalidKeyException
    {
        if(!this.isEncryptInitialized)
            throw new IllegalStateException("The underlying encryptor is not" +
                    " initialized in decrypt mode. You must specify a " +
                    "private key.");
        int length = in.read();
        byte[] wrappedKey = new byte[length];
        in.read(wrappedKey, 0, length);
        Cipher cipherRsa = null;
        Cipher cipherAes = null;
        Key key = null;
        try
        {
            cipherRsa = Cipher.getInstance("RSA");
            cipherAes = Cipher.getInstance("AES");
            cipherRsa.init(Cipher.UNWRAP_MODE, privateKey); 
            key = cipherRsa.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);
        }
        catch(NoSuchAlgorithmException e)//never thrown
        {
            e.printStackTrace();
        }
        catch(NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
 
        cipherAes.init(Cipher.DECRYPT_MODE, key);
 
        crypt(in, out, cipherAes);
        in.close();
        out.close();
    }
 
    /**
     * Crypts or decrypts the specified input stream to the specified output
     * stream with a given cipher. The crypting or decrypting operation is 
     * determined by the cipher's state.
     * @param cipher the cipher used to crypt datas.
     * @param in the input srteal stream to be encypted or decrypted.
     * @param out the output stream to be encypted or decrypted.
     * @throws java.io.IOException if an I/O error occurs during reading 
     * the input stream or writting datas to the output stream.
     */
    public void crypt(InputStream in, OutputStream out, Cipher cipher)
        throws IOException
    {
        int blockSize = cipher.getBlockSize();
        int outputSize = cipher.getOutputSize(blockSize);
        byte[] inBytes = new byte[blockSize];
        byte[] outBytes = new byte[outputSize];
 
        int inLength = 0;
        boolean done = false;
        while(!done)
        {
            inLength = in.read(inBytes);
            if(inLength == blockSize)
            {
                try
                {
                    int outLength = cipher.update(inBytes, 0, blockSize, outBytes);
                    out.write(outBytes, 0, outLength);
                }
                catch(ShortBufferException e)
                {
                    e.printStackTrace();
                }
            }
            else
                done = true;
        }
 
        try
        {
            if(inLength > 0)
                outBytes = cipher.doFinal(inBytes, 0, inLength);
            else
                outBytes = cipher.doFinal();
            out.write(outBytes);
        }
        catch(IllegalBlockSizeException e)
        {
            e.printStackTrace();
        }
        catch(BadPaddingException e)
        {
            e.printStackTrace();
        }
    }
}

Et voilà fini.
Amuse-toi bien ;)

J'avais besoin comme toi de crypter des String sans devoir les écrire, mais ça ne marche pas.

J'ai ceci :
Code:

1 2 3 4 5 6 javax.crypto.IllegalBlockSizeException: Data must not be longer than 128 bytes at com.sun.crypto.provider.RSACipher.a(DashoA13*..) at com.sun.crypto.provider.RSACipher.engineDoFinal(DashoA13*..) at javax.crypto.Cipher.doFinal(DashoA13*..) ...
Il faut passer par cipher.update et passer de petits blocs de bytes, mais le truc c'est que cipher.getBockSize() vaut zéro... Comment as-tu fait?