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package CyrusSasl;
public abstract class SaslUtils
{
/**
* a static array that maps 6 bit integers to a specific char
*/
private final static char enc_table[] =
{
// 0 1 2 3 4 5 6 7
'A','B','C','D','E','F','G','H', // 0
'I','J','K','L','M','N','O','P', // 1
'Q','R','S','T','U','V','W','X', // 2
'Y','Z','a','b','c','d','e','f', // 3
'g','h','i','j','k','l','m','n', // 4
'o','p','q','r','s','t','u','v', // 5
'w','x','y','z','0','1','2','3', // 6
'4','5','6','7','8','9','+','/' // 7
};
private final static byte dec_table[] =
{
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
/**
* Base 64 Encodes a String in byte[] form
*
* @param buf String to be encoded
*
* @return the encoded value in string form
*/
public static String
encode64( byte buf[] )
{
int i = 0;
StringBuffer buffer = new StringBuffer();
int len = buf.length;
int delta = len % 3;
byte a, b, c;
for (int count = len / 3; count > 0; count--)
{
a = buf[i++];
b = buf[i++];
c = buf[i++];
buffer.append(enc_table[(a >>> 2) & 0x3F]);
buffer.append(enc_table[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]);
buffer.append(enc_table[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]);
buffer.append(enc_table[c & 0x3F]);
/* if (i != 0 && i%57 == 0)
buffer.append("\r\n");*/
}
if (delta == 1)
{
a = buf[i++];
buffer.append(enc_table[(a >>> 2) & 0x3F]);
buffer.append(enc_table[((a << 4) & 0x30)]);
buffer.append('=');
buffer.append('=');
}
if (delta == 2)
{
a = buf[i++];
b = buf[i++];
buffer.append(enc_table[(a >>> 2) & 0x3F]);
buffer.append(enc_table[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]);
buffer.append(enc_table[((b << 2) & 0x3c)]);
buffer.append('=');
}
/*buffer.append("\r\n");*/
return buffer.toString();
}
/**
* Base 64 Encodes a String in String form
*
* @param s String to be encoded
*
* @return the encoded value in string form
*/
public static String encode64( String s )
{
return encode64( s.getBytes() );
}
/**
* Base 64 Decodes a byte[] string
* Ignores trailing whitespace and newlines
*
* @param buf buffer to be decoded
*
* @return the decoded value in byte[] form
*/
public static byte[]
decode64( byte buf[] )
{
int padCount = 0;
int i, len = buf.length;
int real_len = 0;
for (i=len-1; i >= 0; --i)
{
if (buf[i] > ' ')
real_len++;
if (buf[i] == 0x3D)
padCount++;
}
// Hmm - should this be a "bad format MIME" exception instead?
if (real_len%4 != 0)
throw new IllegalArgumentException("Length not a multiple of 4");
int ret_len = (real_len/4)*3 - padCount;
byte ret[] = new byte[ret_len];
i = 0;
byte[] t = new byte[4];
int output_index = 0;
int j = 0;
t[0] = t[1] = t[2] = t[3] = 61; // Ascii =
while (i < len)
{
byte c = buf[i++];
if (c > ' ')
t[j++] = c;
if (j == 4)
{
output_index += decode64(ret, output_index, t[0], t[1], t[2], t[3]);
j = 0;
t[0] = t[1] = t[2] = t[3] = 61; // Ascii =
}
}
if (j > 0)
decode64(ret, output_index, t[0], t[1], t[2], t[3]);
return ret;
}
/**
* Base 64 Decodes a String
* Ignores trailing whitespace and newlines
*
* @param msg String to be decoded
*
* @return the decoded value in byte[] form
*/
public static byte[] decode64( String msg )
{
return decode64( msg.getBytes());
}
// Returns the number of bytes converted
private static int
decode64( byte ret[], int ret_off, byte a, byte b, byte c, byte d )
{
byte da = dec_table[a];
byte db = dec_table[b];
byte dc = dec_table[c];
byte dd = dec_table[d];
if (da == -1 || db == -1 || (dc == -1 && c != 0x3d) || (dd == -1 && d != 0x3d))
throw new IllegalArgumentException("Invalid character ["+a+", "+b+", "+c+", "+d+"]");
ret[ret_off++] = (byte)(da << 2 | db >>> 4);
if (c == 0x3d) // Ascii =
return 1;
ret[ret_off++] = (byte)(db << 4 | dc >>> 2);
if (d == 0x3d) // Ascii =
return 2;
ret[ret_off++] = (byte)(dc << 6 | dd);
return 3;
}
}
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