/****************************************************************************
*
* Copyright (C) 2000-2001 RealNetworks, Inc. All rights reserved.
*
* This program is free software. It may be distributed under the terms
* in the file LICENSE, found in the top level of the source distribution.
*
*/
#include "types.h"
#include "str.h"
#include "util.h"
#include "dbg.h"
#include <ctype.h>
// Unsafe character map for the range 0x20..0x7F according to RFC1738
static BYTE s_byUrlEscapeMap[0x80-0x20] =
{
// ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ?
1,0,1,1,0,1,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,
// @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _
1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,
// ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~ DEL
1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1
};
CString UrlEncode( CPCHAR sz )
{
CPBYTE pSrc;
UINT nLength = 0;
// Find string length and count of escaped chars
for( pSrc = (CPBYTE)sz; *pSrc; pSrc++ )
{
nLength++;
if( *pSrc >= 0x20 && *pSrc < 0x80 ) nLength += 2*s_byUrlEscapeMap[ *pSrc - 0x20 ];
}
CString strEncoded( '\0', nLength );
PBYTE pDest = (PBYTE)(CPBYTE)strEncoded.c_str(); // Do this with operator[] instead?
for( pSrc = (CPBYTE)sz; *pSrc; pSrc++ )
{
if( *pSrc >= 0x20 && *pSrc < 0x80 && s_byUrlEscapeMap[ *pSrc - 0x20 ] )
{
char chHex1 = '0' + ( *pSrc / 16 );
if( chHex1 > '9' ) chHex1 += ( 'A' - ('9'+1) );
char chHex2 = '0' + ( *pSrc % 16 );
if( chHex2 > '9' ) chHex2 += ( 'A' - ('9'+1) );
*pDest++ = '%';
*pDest++ = chHex1;
*pDest++ = chHex2;
}
else
{
*pDest++ = *pSrc;
}
}
return strEncoded;
}
CString UrlDecode( CPCHAR sz )
{
CPBYTE pSrc;
UINT nLength = 0;
for( pSrc = (CPBYTE)sz; *pSrc; pSrc++ )
{
nLength++;
if( '%' == *pSrc &&
isxdigit( *(pSrc+1) ) &&
isxdigit( *(pSrc+2) ) )
{
pSrc += 2;
}
}
CString strDecoded( '\0', nLength );
PBYTE pDest = (PBYTE)(CPBYTE)strDecoded.c_str();
for( pSrc = (CPBYTE)sz; *pSrc; pSrc++ )
{
if( '%' == *pSrc &&
isxdigit( *(pSrc+1) ) &&
isxdigit( *(pSrc+2) ) )
{
BYTE byHex1 = toupper( *(pSrc+1) ) - '0';
if( byHex1 > 9 ) byHex1 -= ( 'A' - ('9'+1) );
BYTE byHex2 = toupper( *(pSrc+2) ) - '0';
if( byHex2 > 9 ) byHex2 -= ( 'A' - ('9'+1) );
*pDest++ = byHex1 * 16 + byHex2;
pSrc += 2;
}
else
{
*pDest++ = *pSrc;
}
}
return strDecoded;
}
CString Base64Encode( CPCHAR sz )
{
UINT nLen = strlen( sz );
if( !nLen )
{
dbgout( "Base64Encode: empty string" );
return CString("");
}
CString strEncoded( 'x', 4*((nLen+2)/3) );
PCHAR pDest = (PCHAR)strEncoded.c_str();
while( *sz )
{
int quad = 0;
int n;
for( n = 0; n < 3; n++ )
{
quad <<= 8;
if( *sz )
{
quad += (int)(*sz);
sz++;
}
}
for( n = 3; n >= 0; n-- )
{
if( quad & 0xFF )
{
int val = quad & 0x3F;
if( val < 26 ) *(pDest+n) = 'A' - 0 + val;
else if( val < 52 ) *(pDest+n) = 'a' - 26 + val;
else if( val < 62 ) *(pDest+n) = '0' - 52 + val;
else if( val == 62 ) *(pDest+n) = '+';
else *(pDest+n) = '/';
}
else
{
*(pDest+n) = '=';
}
quad >>= 6;
}
pDest += 4;
}
return strEncoded;
}
CString Base64Decode( CPCHAR sz )
{
UINT nLen = strlen( sz );
if( !nLen || nLen % 4 )
{
dbgout( "Base64Decode: length %u for '%s'", nLen, sz );
return CString("");
}
CString strDecoded( '\0', 3*((nLen+3)/4) );
PCHAR pDest = (PCHAR)strDecoded.c_str();
while( *sz )
{
int trip = 0;
int n;
for( n = 0; n < 4; n++ )
{
int val = 0;
if( *sz >= 'A' && *sz <= 'Z' ) val = *sz - 'A' + 0;
else if( *sz >= 'a' && *sz <= 'z' ) val = *sz - 'a' + 26;
else if( *sz >= '0' && *sz <= '9' ) val = *sz - '0' + 52;
else if( *sz == '+' ) val = 62;
else if( *sz == '/' ) val = 63;
trip <<= 6;
trip += val;
sz++;
}
for( n = 2; n >= 0; n-- )
{
*(pDest+n) = trip & 0xFF;
trip >>= 8;
}
pDest += 3;
}
return strDecoded;
}
////////////////////////////////////////
/* Constants for MD5Transform routine. */
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
typedef unsigned char* POINTER;
static void MD5Transform( UINT32[4], unsigned char[64] );
static void Encode( unsigned char*, UINT32*, unsigned int );
static void Decode( UINT32*, unsigned char*, unsigned int );
static void MD5_memcpy( POINTER, POINTER, unsigned int );
static void MD5_memset( POINTER, int, unsigned int );
static unsigned char PADDING[64] =
{
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/* F, G, H and I are basic MD5 functions. */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
/* ROTATE_LEFT rotates x left n bits. */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT32)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT32)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT32)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT32)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init( MD5_CTX *context )
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update( MD5_CTX *context, unsigned char *input, unsigned int inputLen )
{
unsigned int i, index, partLen;
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
/* Update number of bits */
if( (context->count[0] += ((UINT32)inputLen << 3))
< ((UINT32)inputLen << 3) )
context->count[1]++;
context->count[1] += ((UINT32)inputLen >> 29);
partLen = 64 - index;
/* Transform as many times as possible.
*/
if( inputLen >= partLen )
{
MD5_memcpy
((POINTER)&context->buffer[index], (POINTER)input, partLen);
MD5Transform (context->state, context->buffer);
for( i = partLen; i + 63 < inputLen; i += 64 )
MD5Transform (context->state, &input[i]);
index = 0;
}
else
i = 0;
/* Buffer remaining input */
MD5_memcpy
((POINTER)&context->buffer[index], (POINTER)&input[i],
inputLen-i);
}
/* MD5 finalization. Ends an MD5 message-digest operation, writing the
the message digest and zeroizing the context.
*/
void MD5Final( unsigned char digest[16], MD5_CTX *context )
{
unsigned char bits[8];
unsigned int index, padLen;
/* Save number of bits */
Encode (bits, context->count, 8);
/* Pad out to 56 mod 64.
*/
index = (unsigned int)((context->count[0] >> 3) & 0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
MD5Update (context, PADDING, padLen);
/* Append length (before padding) */
MD5Update (context, bits, 8);
/* Store state in digest */
Encode (digest, context->state, 16);
/* Zeroize sensitive information.
*/
MD5_memset ((POINTER)context, 0, sizeof (*context));
}
/* MD5 basic transformation. Transforms state based on block.
*/
static void MD5Transform( UINT32 state[4], unsigned char block[64] )
{
UINT32 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
Decode (x, block, 64);
/* Round 1 */
FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
/* Round 2 */
GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
/* Round 3 */
HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
/* Round 4 */
II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
/* Zeroize sensitive information.
*/
MD5_memset ((POINTER)x, 0, sizeof (x));
}
/* Encodes input (UINT32) into output (unsigned char). Assumes len is
a multiple of 4.
*/
static void Encode( unsigned char *output, UINT32 *input, unsigned int len )
{
unsigned int i, j;
for( i = 0, j = 0; j < len; i++, j += 4 )
{
output[j] = (unsigned char)(input[i] & 0xff);
output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
}
}
/* Decodes input (unsigned char) into output (UINT32). Assumes len is
a multiple of 4.
*/
static void Decode( UINT32 *output, unsigned char *input, unsigned int len )
{
unsigned int i, j;
for( i = 0, j = 0; j < len; i++, j += 4 )
output[i] = ((UINT32)input[j]) | (((UINT32)input[j+1]) << 8) |
(((UINT32)input[j+2]) << 16) | (((UINT32)input[j+3]) << 24);
}
/* Note: Replace "for loop" with standard memcpy if possible.
*/
static void MD5_memcpy( POINTER output, POINTER input, unsigned int len )
{
unsigned int i;
for( i = 0; i < len; i++ )
output[i] = input[i];
}
/* Note: Replace "for loop" with standard memset if possible.
*/
static void MD5_memset( POINTER output, int value, unsigned int len )
{
unsigned int i;
for( i = 0; i < len; i++ )
((char *)output)[i] = (char)value;
}
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