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419 lines
11 KiB
C++
419 lines
11 KiB
C++
// MD5.CPP - RSA Data Security, Inc., MD5 message-digest algorithm
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/*
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Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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rights reserved.
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License to copy and use this software is granted provided that it
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is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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Algorithm" in all material mentioning or referencing this software
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or this function.
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License is also granted to make and use derivative works provided
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that such works are identified as "derived from the RSA Data
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Security, Inc. MD5 Message-Digest Algorithm" in all material
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mentioning or referencing the derived work.
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RSA Data Security, Inc. makes no representations concerning either
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the merchantability of this software or the suitability of this
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software for any particular purpose. It is provided "as is"
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without express or implied warranty of any kind.
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These notices must be retained in any copies of any part of this
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documentation and/or software.
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*/
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//#include <assert.h>
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#include <memory.h>
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#include <ctype.h>
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#include <vector>
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#include "MD5.h"
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using std::string;
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using std::vector;
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// Constants for MD5Transform routine.
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#define S11 7
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#define S12 12
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#define S13 17
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#define S14 22
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#define S21 5
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#define S22 9
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#define S23 14
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#define S24 20
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#define S31 4
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#define S32 11
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#define S33 16
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#define S34 23
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#define S41 6
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#define S42 10
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#define S43 15
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#define S44 21
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static void MD5Transform ( UINT4 [4], const uchar [64] );
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static void Encode ( unsigned char *, UINT4 *, unsigned int );
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static void Decode ( UINT4 *, const uchar *, unsigned int );
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static unsigned char PADDING[64] =
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{
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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// F, G, H and I are basic MD5 functions.
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#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | (~z)))
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// ROTATE_LEFT rotates x left n bits.
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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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// FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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// Rotation is separate from addition to prevent recomputation.
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#define FF(a, b, c, d, x, s, ac) { \
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(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define GG(a, b, c, d, x, s, ac) { \
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(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define HH(a, b, c, d, x, s, ac) { \
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(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define II(a, b, c, d, x, s, ac) { \
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(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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// MD5 initialization. Begins an MD5 operation, writing a new context.
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void MD5Init (
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MD5_CTX *context ) // context
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{
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context->count[0] = context->count[1] = 0;
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// Load magic initialization constants.
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context->state[0] = 0x67452301;
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context->state[1] = 0xefcdab89;
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context->state[2] = 0x98badcfe;
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context->state[3] = 0x10325476;
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}
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// MD5 block update operation. Continues an MD5 message-digest
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// operation, processing another message block, and updating the
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// context.
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void MD5Update (
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MD5_CTX *context, // context
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const char *input_, // input block
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unsigned int inputLen ) // length of input block
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{
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unsigned int i, index, partLen;
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const uchar* input = (const uchar*)input_;
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// Compute number of bytes mod 64
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index = (unsigned int)((context->count[0] >> 3) & 0x3F);
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// Update number of bits
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if ((context->count[0] += ((UINT4)inputLen << 3))
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< ((UINT4)inputLen << 3))
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context->count[1]++;
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context->count[1] += ((UINT4)inputLen >> 29);
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partLen = 64 - index;
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// Transform as many times as possible.
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if (inputLen >= partLen)
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{
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memcpy
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((POINTER)&context->buffer[index], (POINTER)input, partLen);
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MD5Transform (context->state, context->buffer);
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for (i = partLen; i + 63 < inputLen; i += 64)
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MD5Transform (context->state, &input[i]);
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index = 0;
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}
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else
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i = 0;
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// Buffer remaining input
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memcpy
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((POINTER)&context->buffer[index], (POINTER)&input[i],
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inputLen-i);
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}
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// MD5 finalization. Ends an MD5 message-digest operation, writing the
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// the message digest and zeroizing the context.
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void MD5Final (
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unsigned char digest[16], // message digest
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MD5_CTX *context ) // context
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{
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uchar bits[8];
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unsigned int index, padLen;
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// Save number of bits
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Encode (bits, context->count, 8);
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// Pad out to 56 mod 64.
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index = (unsigned int)((context->count[0] >> 3) & 0x3f);
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padLen = (index < 56) ? (56 - index) : (120 - index);
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MD5Update (context, (const char*)PADDING, padLen);
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// Append length (before padding)
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MD5Update (context, (const char*)bits, 8);
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// Store state in digest
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Encode (digest, context->state, 16);
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// Zeroize sensitive information.
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memset ((POINTER)context, 0, sizeof (*context));
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}
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// MD5 basic transformation. Transforms state based on block.
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static void MD5Transform (
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UINT4 state[4],
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const uchar block[64] )
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{
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UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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Decode (x, block, 64);
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// Round 1
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FF (a, b, c, d, x[ 0], S11, 0xd76aa478); // 1
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FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); // 2
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FF (c, d, a, b, x[ 2], S13, 0x242070db); // 3
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FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); // 4
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FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); // 5
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FF (d, a, b, c, x[ 5], S12, 0x4787c62a); // 6
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FF (c, d, a, b, x[ 6], S13, 0xa8304613); // 7
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FF (b, c, d, a, x[ 7], S14, 0xfd469501); // 8
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FF (a, b, c, d, x[ 8], S11, 0x698098d8); // 9
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FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); // 10
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FF (c, d, a, b, x[10], S13, 0xffff5bb1); // 11
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FF (b, c, d, a, x[11], S14, 0x895cd7be); // 12
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FF (a, b, c, d, x[12], S11, 0x6b901122); // 13
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FF (d, a, b, c, x[13], S12, 0xfd987193); // 14
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FF (c, d, a, b, x[14], S13, 0xa679438e); // 15
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FF (b, c, d, a, x[15], S14, 0x49b40821); // 16
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// Round 2
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GG (a, b, c, d, x[ 1], S21, 0xf61e2562); // 17
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GG (d, a, b, c, x[ 6], S22, 0xc040b340); // 18
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GG (c, d, a, b, x[11], S23, 0x265e5a51); // 19
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GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); // 20
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GG (a, b, c, d, x[ 5], S21, 0xd62f105d); // 21
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GG (d, a, b, c, x[10], S22, 0x2441453); // 22
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GG (c, d, a, b, x[15], S23, 0xd8a1e681); // 23
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GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); // 24
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GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); // 25
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GG (d, a, b, c, x[14], S22, 0xc33707d6); // 26
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GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); // 27
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GG (b, c, d, a, x[ 8], S24, 0x455a14ed); // 28
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GG (a, b, c, d, x[13], S21, 0xa9e3e905); // 29
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GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); // 30
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GG (c, d, a, b, x[ 7], S23, 0x676f02d9); // 31
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GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); // 32
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// Round 3
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HH (a, b, c, d, x[ 5], S31, 0xfffa3942); // 33
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HH (d, a, b, c, x[ 8], S32, 0x8771f681); // 34
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HH (c, d, a, b, x[11], S33, 0x6d9d6122); // 35
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HH (b, c, d, a, x[14], S34, 0xfde5380c); // 36
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HH (a, b, c, d, x[ 1], S31, 0xa4beea44); // 37
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HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); // 38
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HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); // 39
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HH (b, c, d, a, x[10], S34, 0xbebfbc70); // 40
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HH (a, b, c, d, x[13], S31, 0x289b7ec6); // 41
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HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); // 42
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HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); // 43
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HH (b, c, d, a, x[ 6], S34, 0x4881d05); // 44
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HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); // 45
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HH (d, a, b, c, x[12], S32, 0xe6db99e5); // 46
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HH (c, d, a, b, x[15], S33, 0x1fa27cf8); // 47
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HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); // 48
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// Round 4
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II (a, b, c, d, x[ 0], S41, 0xf4292244); // 49
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II (d, a, b, c, x[ 7], S42, 0x432aff97); // 50
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II (c, d, a, b, x[14], S43, 0xab9423a7); // 51
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II (b, c, d, a, x[ 5], S44, 0xfc93a039); // 52
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II (a, b, c, d, x[12], S41, 0x655b59c3); // 53
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II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); // 54
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II (c, d, a, b, x[10], S43, 0xffeff47d); // 55
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II (b, c, d, a, x[ 1], S44, 0x85845dd1); // 56
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II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); // 57
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II (d, a, b, c, x[15], S42, 0xfe2ce6e0); // 58
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II (c, d, a, b, x[ 6], S43, 0xa3014314); // 59
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II (b, c, d, a, x[13], S44, 0x4e0811a1); // 60
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II (a, b, c, d, x[ 4], S41, 0xf7537e82); // 61
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II (d, a, b, c, x[11], S42, 0xbd3af235); // 62
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II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); // 63
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II (b, c, d, a, x[ 9], S44, 0xeb86d391); // 64
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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// Zeroize sensitive information.
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memset ((POINTER)x, 0, sizeof (x));
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}
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// Encodes input (UINT4) into output (unsigned char). Assumes len is
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// a multiple of 4.
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static void Encode (
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unsigned char *output,
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UINT4 *input,
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unsigned int len )
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{
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unsigned int i, j;
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for (i = 0, j = 0; j < len; i++, j += 4) {
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output[j] = (unsigned char)(input[i] & 0xff);
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output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
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output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
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output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
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}
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}
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// Decodes input (unsigned char) into output (UINT4). Assumes len is
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// a multiple of 4.
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static void Decode (
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UINT4 *output,
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const uchar *input,
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unsigned int len )
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{
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unsigned int i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
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(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
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}
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void digest2ascii ( char *ascii, const unsigned char *digest )
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{
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int i;
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static char* table = "0123456789abcdef";
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for ( i = 0; i < 16; i++ )
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{
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*ascii++ = table[(*digest)>>4];
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*ascii++ = table[(*digest++)%16];
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}
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*ascii++ = 0;
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}
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void ascii2digest ( unsigned char *digest, const char *ascii )
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{
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int i;
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#define CONV(c) (unsigned char)( (toupper(c)>='A') ? (toupper(c)+10-'A') : ((c)-'0') )
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#define MAKECHAR(a,b) ((CONV(a)%16)<<4)|(CONV(b)%16)
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for ( i = 0; i < 16; i++ )
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{
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*digest++ = MAKECHAR(ascii[0],ascii[1]);
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ascii += 2;
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}
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}
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#ifdef __cplusplus
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MD5::MD5()
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{
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Init();
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}
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void MD5::Init()
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{
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MD5Init(&_ctx);
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}
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void MD5::Update ( const string& s )
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{
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MD5Update ( &_ctx, s.c_str(), s.size() );
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}
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string MD5::Final ( char* digest )
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{
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vector<uchar> v;
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v.resize(16);
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MD5Final ( &v[0], &_ctx );
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if ( digest )
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memmove ( digest, &v[0], 16 );
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string s;
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static char* tohex = "0123456789abcdef";
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for ( int i = 0; i < 16; i++ )
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{
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uchar c = v[i];
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s += tohex[ (c>>4) & 0xF ];
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s += tohex[ c & 0xF ];
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}
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return s;
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}
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string MD5Hex ( const string& s )
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{
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MD5 md5;
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md5.Update ( s );
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return md5.Final();
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}
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string MD5Bin ( const string& s )
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{
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MD5 md5;
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md5.Update ( s );
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char digest[16];
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md5.Final ( digest );
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return string ( digest, 16 );
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}
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string HMAC_MD5 ( const string& key, const string& text, char* out_bin )
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{
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MD5 md5;
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char k_ipad[65]; // inner padding - key XORd with ipad
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char k_opad[65]; // outer padding - key XORd with opad
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string tmp;
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char digest[16];
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int i;
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// if key is longer than 64 bytes reset it to key=MD5(key)
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if ( key.length() > 64 )
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{
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md5.Init();
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md5.Update ( key );
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md5.Final ( digest );
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tmp = string ( digest, 16 );
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}
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else
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tmp = key;
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// start out by storing key in pads
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memset ( k_ipad, 0, sizeof(k_ipad) );
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memset ( k_opad, 0, sizeof(k_opad) );
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memcpy ( k_ipad, tmp.c_str(), tmp.length() );
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memcpy ( k_opad, tmp.c_str(), tmp.length() );
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// XOR key with ipad and opad values
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for ( i=0; i<64; i++ )
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{
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k_ipad[i] ^= 0x36;
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k_opad[i] ^= 0x5c;
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}
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// "inner" MD5
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md5.Init();
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md5.Update(k_ipad);
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md5.Update(text);
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md5.Final ( digest );
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// "outer" MD5
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md5.Init();
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md5.Update(k_opad);
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md5.Update(string(digest,16));
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return md5.Final(out_bin);
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}
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#endif//__cplusplus
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