Discussion :

[Greg L.]

Bonjour à tous,

Je travaille actuellement avec un outil qui dispose d'un interpréteur/compilateur C, et j'ai besoin de hasher une chaine de caractère (variable, forcément) en MD5. Manque de bol et aussi curieux que ça puisse paraitre, l'outil que j'utilise n'embarque pas de fonction d'encodage ... alors qu'il est capable de travailler avec des connexions sécurisées.

Bref, je cherche une bibliothèque (sous forme de DLL + .h) me permettant simplement de hasher une chaine en MD5, car je peux inclure des bibliothèques externes à mon programme C.

Est-ce que quelqu'un a ça sous la main ou peut me donner une piste ?

Merci d'avance.

[homeostasie]

Tu devrais aller jeter un coup d'oeil du coté de:
http://fr.wikipedia.org/wiki/MD5

A la fin, il y a plusieurs liens interessants et notamment celui ci:
Une implémentation simple en C

[D[r]eadLock]

md5(3) OpenSSL md5(3)



NAME
MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update, MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4, and MD5 hash
functions

SYNOPSIS
#include <openssl/md2.h>

unsigned char *MD2(const unsigned char *d, unsigned long n,
unsigned char *md);

void MD2_Init(MD2_CTX *c);
void MD2_Update(MD2_CTX *c, const unsigned char *data,
unsigned long len);
void MD2_Final(unsigned char *md, MD2_CTX *c);

#include <openssl/md4.h>

unsigned char *MD4(const unsigned char *d, unsigned long n,
unsigned char *md);

void MD4_Init(MD4_CTX *c);
void MD4_Update(MD4_CTX *c, const void *data,
unsigned long len);
void MD4_Final(unsigned char *md, MD4_CTX *c);

#include <openssl/md5.h>

unsigned char *MD5(const unsigned char *d, unsigned long n,
unsigned char *md);

void MD5_Init(MD5_CTX *c);
void MD5_Update(MD5_CTX *c, const void *data,
unsigned long len);
void MD5_Final(unsigned char *md, MD5_CTX *c);

DESCRIPTION
MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output.

MD2(), MD4(), and MD5() compute the MD2, MD4, and MD5 message digest of the n bytes at d and place it in md (which must have space for
MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16 bytes of output). If md is NULL, the digest is placed in a static array.

The following functions may be used if the message is not completely stored in memory:

MD2_Init() initializes a MD2_CTX structure.

MD2_Update() can be called repeatedly with chunks of the message to be hashed (len bytes at data).

MD2_Final() places the message digest in md, which must have space for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the MD2_CTX.

MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() are analogous using an MD4_CTX and MD5_CTX structure.

Applications should use the higher level functions EVP_DigestInit(3) etc. instead of calling the hash functions directly.

NOTE
MD2, MD4, and MD5 are recommended only for compatibility with existing applications. In new applications, SHA-1 or RIPEMD-160 should be pre-
ferred.

RETURN VALUES
MD2(), MD4(), and MD5() return pointers to the hash value.

MD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() do not return values.

CONFORMING TO
RFC 1319, RFC 1320, RFC 1321

SEE ALSO
sha(3), ripemd(3), EVP_DigestInit(3)

HISTORY
MD2(), MD2_Init(), MD2_Update() MD2_Final(), MD5(), MD5_Init(), MD5_Update() and MD5_Final() are available in all versions of SSLeay and
OpenSSL.

MD4(), MD4_Init(), and MD4_Update() are available in OpenSSL 0.9.6 and above.



0.9.8d 2000-08-14 md5(3)