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| import java.io.UnsupportedEncodingException;
/**
* The <code>Base64</code> is the entry point for a Base64 encoder/decoder.
*
* @version 1.0
*
* @author Extract from BouncyCastle
*/
public class Base64
{
private static final byte[] encodingTable =
{
(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
(byte)'v',
(byte)'w', (byte)'x', (byte)'y', (byte)'z',
(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6',
(byte)'7', (byte)'8', (byte)'9',
(byte)'+', (byte)'/'
};
/**
* encode the input data producong a base 64 encoded byte array.
*
* @return a String containing the base 64 encoded data.
*/
private static String lcl_encode(
byte[] data, String pemType)
{
byte[] bytes;
int modulus = data.length % 3;
int add = 0;
if (pemType != null)
{
if (pemType.length() > 0)
{
add = data.length / 45;
add += 17; /* ----BEGIN ...-----\n */
add += pemType.length();
add += 16; /* \n----END ...-----\n */
add += pemType.length();
}
}
if (modulus == 0)
{
bytes = new byte[(4 * data.length / 3) + add];
}
else
{
bytes = new byte[(4 * ((data.length / 3) + 1)) + add];
}
int dataLength = (data.length - modulus);
int j, a1, a2, a3;
j = 0;
if (add != 0)
{
byte []
btmp;
String
stmp;
stmp = "-----BEGIN " + pemType + "-----";
btmp = stmp.getBytes();
for (j = 0; j < btmp.length; j++)
bytes[j] = btmp[j];
}
for (int i = 0; i < dataLength; i += 3, j += 4)
{
a1 = data[i] & 0xff;
a2 = data[i + 1] & 0xff;
a3 = data[i + 2] & 0xff;
if (add != 0 && (i % 45) == 0)
bytes[j++] = 0x0a;
bytes[j] = encodingTable[(a1 >>> 2) & 0x3f];
bytes[j + 1] = encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f];
bytes[j + 2] = encodingTable[((a2 << 2) | (a3 >>> 6)) & 0x3f];
bytes[j + 3] = encodingTable[a3 & 0x3f];
}
/*
* process the tail end.
*/
int b1, b2, b3;
int d1, d2;
switch (modulus)
{
case 0: /* nothing left to do */
break;
case 1:
d1 = data[data.length - 1] & 0xff;
b1 = (d1 >>> 2) & 0x3f;
b2 = (d1 << 4) & 0x3f;
bytes[j++] = encodingTable[b1];
bytes[j++] = encodingTable[b2];
bytes[j++] = (byte)'=';
bytes[j++] = (byte)'=';
break;
case 2:
d1 = data[data.length - 2] & 0xff;
d2 = data[data.length - 1] & 0xff;
b1 = (d1 >>> 2) & 0x3f;
b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f;
b3 = (d2 << 2) & 0x3f;
bytes[j++] = encodingTable[b1];
bytes[j++] = encodingTable[b2];
bytes[j++] = encodingTable[b3];
bytes[j++] = (byte)'=';
break;
}
if (add != 0)
{
byte []
btmp;
String
stmp;
stmp = "\n-----END " + pemType + "-----\n";
btmp = stmp.getBytes();
for (a1 = 0; a1 < btmp.length; a1++, j++)
bytes[j] = btmp[a1];
}
return new String (bytes);
}
/**
* encode the input data producong a base 64 encoded byte array.
*
* @return a String containing the base 64 encoded data.
*/
private static String lcl_encode(
String data, String pemType)
{
byte []
b;
try {
/*
* We really do want ASCII7 -- the http protocol doesn't change
* with locale.
*/
b = data.getBytes("ASCII7");
}
catch (UnsupportedEncodingException ignored) {
/*
* If ASCII7 isn't there, something serious is wrong, but
* Paranoia Is Good (tm)
*/
b = data.getBytes();
}
return lcl_encode(b, pemType);
}
public static String encode(
byte[] data)
{
return lcl_encode(data, null);
}
public static String encode(
String data)
{
return lcl_encode(data, null);
}
public static String der2pem(
byte[] data, String pemType)
{
return lcl_encode(data, pemType);
}
/*
* set up the decoding table.
*/
private static final byte[] decodingTable;
static
{
decodingTable = new byte[128];
for (int i = 'A'; i <= 'Z'; i++)
{
decodingTable[i] = (byte)(i - 'A');
}
for (int i = 'a'; i <= 'z'; i++)
{
decodingTable[i] = (byte)(i - 'a' + 26);
}
for (int i = '0'; i <= '9'; i++)
{
decodingTable[i] = (byte)(i - '0' + 52);
}
decodingTable['+'] = 62;
decodingTable['/'] = 63;
}
/**
* decode the base 64 encoded input data.
*
* @return a byte array representing the decoded data.
*/
public static byte[] decode(
byte[] data)
{
byte[] bytes;
byte b1, b2, b3, b4;
if (data[data.length - 2] == '=')
{
bytes = new byte[(((data.length / 4) - 1) * 3) + 1];
}
else if (data[data.length - 1] == '=')
{
bytes = new byte[(((data.length / 4) - 1) * 3) + 2];
}
else
{
bytes = new byte[((data.length / 4) * 3)];
}
for (int i = 0, j = 0; i < data.length - 4; i += 4, j += 3)
{
b1 = decodingTable[data[i]];
b2 = decodingTable[data[i + 1]];
b3 = decodingTable[data[i + 2]];
b4 = decodingTable[data[i + 3]];
bytes[j] = (byte)((b1 << 2) | (b2 >> 4));
bytes[j + 1] = (byte)((b2 << 4) | (b3 >> 2));
bytes[j + 2] = (byte)((b3 << 6) | b4);
}
if (data[data.length - 2] == '=')
{
b1 = decodingTable[data[data.length - 4]];
b2 = decodingTable[data[data.length - 3]];
bytes[bytes.length - 1] = (byte)((b1 << 2) | (b2 >> 4));
}
else if (data[data.length - 1] == '=')
{
b1 = decodingTable[data[data.length - 4]];
b2 = decodingTable[data[data.length - 3]];
b3 = decodingTable[data[data.length - 2]];
bytes[bytes.length - 2] = (byte)((b1 << 2) | (b2 >> 4));
bytes[bytes.length - 1] = (byte)((b2 << 4) | (b3 >> 2));
}
else
{
b1 = decodingTable[data[data.length - 4]];
b2 = decodingTable[data[data.length - 3]];
b3 = decodingTable[data[data.length - 2]];
b4 = decodingTable[data[data.length - 1]];
bytes[bytes.length - 3] = (byte)((b1 << 2) | (b2 >> 4));
bytes[bytes.length - 2] = (byte)((b2 << 4) | (b3 >> 2));
bytes[bytes.length - 1] = (byte)((b3 << 6) | b4);
}
return bytes;
}
/**
* decode the base 64 encoded String data.
*
* @return a byte array representing the decoded data.
*/
public static byte[] decode(
String data)
{
byte []
b;
try {
/*
* We really do want ASCII7 -- the http protocol doesn't change
* with locale.
*/
b = data.getBytes("ASCII7");
}
catch (UnsupportedEncodingException ignored) {
/*
* If ASCII7 isn't there, something serious is wrong, but
* Paranoia Is Good (tm)
*/
b = data.getBytes();
}
return decode(b);
}
} |
[String][ASCII]Java / Python
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