297 lines
9.9 KiB
C++
297 lines
9.9 KiB
C++
|
/*
|
||
|
|
* Copyright (c) 2007, Cameron Rich
|
||
|
|
*
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions are met:
|
||
|
|
*
|
||
|
|
* * Redistributions of source code must retain the above copyright notice,
|
||
|
|
* this list of conditions and the following disclaimer.
|
||
|
|
* * Redistributions in binary form must reproduce the above copyright notice,
|
||
|
|
* this list of conditions and the following disclaimer in the documentation
|
||
|
|
* and/or other materials provided with the distribution.
|
||
|
|
* * Neither the name of the axTLS project nor the names of its contributors
|
||
|
|
* may be used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
||
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
||
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
||
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
||
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This file implements the MD5 algorithm as defined in RFC1321
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
#include "crypt_md5.h"
|
||
|
|
|
||
|
|
/* 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
|
||
|
|
|
||
|
|
/* ----- static functions ----- */
|
||
|
|
static void OVMS_MD5Transform(uint32_t state[4], const uint8_t block[64]);
|
||
|
|
static void OVMS_Encode(uint8_t *output, uint32_t *input, uint32_t len);
|
||
|
|
static void OVMS_Decode(uint32_t *output, const uint8_t *input, uint32_t len);
|
||
|
|
|
||
|
|
uint32_t t_x[OVMS_MD5_SIZE];
|
||
|
|
|
||
|
|
/* 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_t)(ac); \
|
||
|
|
(a) = ROTATE_LEFT ((a), (s)); \
|
||
|
|
(a) += (b); \
|
||
|
|
}
|
||
|
|
#define GG(a, b, c, d, x, s, ac) { \
|
||
|
|
(a) += G ((b), (c), (d)) + (x) + (uint32_t)(ac); \
|
||
|
|
(a) = ROTATE_LEFT ((a), (s)); \
|
||
|
|
(a) += (b); \
|
||
|
|
}
|
||
|
|
#define HH(a, b, c, d, x, s, ac) { \
|
||
|
|
(a) += H ((b), (c), (d)) + (x) + (uint32_t)(ac); \
|
||
|
|
(a) = ROTATE_LEFT ((a), (s)); \
|
||
|
|
(a) += (b); \
|
||
|
|
}
|
||
|
|
#define II(a, b, c, d, x, s, ac) { \
|
||
|
|
(a) += I ((b), (c), (d)) + (x) + (uint32_t)(ac); \
|
||
|
|
(a) = ROTATE_LEFT ((a), (s)); \
|
||
|
|
(a) += (b); \
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* MD5 initialization - begins an MD5 operation, writing a new ctx.
|
||
|
|
*/
|
||
|
|
void OVMS_MD5_Init(OVMS_MD5_CTX *ctx)
|
||
|
|
{
|
||
|
|
ctx->count[0] = ctx->count[1] = 0;
|
||
|
|
|
||
|
|
/* Load magic initialization constants.
|
||
|
|
*/
|
||
|
|
ctx->state[0] = 0x67452301;
|
||
|
|
ctx->state[1] = 0xefcdab89;
|
||
|
|
ctx->state[2] = 0x98badcfe;
|
||
|
|
ctx->state[3] = 0x10325476;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Accepts an array of octets as the next portion of the message.
|
||
|
|
*/
|
||
|
|
void OVMS_MD5_Update(OVMS_MD5_CTX *ctx, const uint8_t * msg, int len)
|
||
|
|
{
|
||
|
|
uint32_t x;
|
||
|
|
int i, partLen;
|
||
|
|
|
||
|
|
/* Compute number of bytes mod 64 */
|
||
|
|
x = (uint32_t)((ctx->count[0] >> 3) & 0x3F);
|
||
|
|
|
||
|
|
/* Update number of bits */
|
||
|
|
if ((ctx->count[0] += ((uint32_t)len << 3)) < ((uint32_t)len << 3))
|
||
|
|
ctx->count[1]++;
|
||
|
|
ctx->count[1] += ((uint32_t)len >> 29);
|
||
|
|
|
||
|
|
partLen = 64 - x;
|
||
|
|
|
||
|
|
/* Transform as many times as possible. */
|
||
|
|
if (len >= partLen)
|
||
|
|
{
|
||
|
|
memcpy(&ctx->buffer[x], msg, partLen);
|
||
|
|
OVMS_MD5Transform(ctx->state, ctx->buffer);
|
||
|
|
|
||
|
|
for (i = partLen; i + 63 < len; i += 64)
|
||
|
|
OVMS_MD5Transform(ctx->state, &msg[i]);
|
||
|
|
|
||
|
|
x = 0;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
i = 0;
|
||
|
|
|
||
|
|
/* Buffer remaining input */
|
||
|
|
memcpy(&ctx->buffer[x], &msg[i], len-i);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return the 128-bit message digest into the user's array
|
||
|
|
*/
|
||
|
|
void OVMS_MD5_Final(uint8_t *digest, OVMS_MD5_CTX *ctx)
|
||
|
|
{
|
||
|
|
uint8_t bits[8];
|
||
|
|
uint32_t x, padLen;
|
||
|
|
uint8_t PADDING;
|
||
|
|
|
||
|
|
/* Save number of bits */
|
||
|
|
OVMS_Encode(bits, ctx->count, 8);
|
||
|
|
|
||
|
|
/* Pad out to 56 mod 64.
|
||
|
|
*/
|
||
|
|
x = (uint32_t)((ctx->count[0] >> 3) & 0x3f);
|
||
|
|
padLen = (x < 56) ? (56 - x) : (120 - x);
|
||
|
|
if (padLen>0)
|
||
|
|
{
|
||
|
|
PADDING = 0x80;
|
||
|
|
OVMS_MD5_Update(ctx, (const uint8_t*)&PADDING, 1);
|
||
|
|
}
|
||
|
|
PADDING = 0x00;
|
||
|
|
for (padLen--;padLen>0;padLen--)
|
||
|
|
OVMS_MD5_Update(ctx, (const uint8_t*)&PADDING, 1);
|
||
|
|
|
||
|
|
/* Append length (before padding) */
|
||
|
|
OVMS_MD5_Update(ctx, bits, 8);
|
||
|
|
|
||
|
|
/* Store state in digest */
|
||
|
|
OVMS_Encode(digest, ctx->state, OVMS_MD5_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* MD5 basic transformation. Transforms state based on block.
|
||
|
|
*/
|
||
|
|
static void OVMS_MD5Transform(uint32_t state[4], const uint8_t block[64])
|
||
|
|
{
|
||
|
|
uint32_t a = state[0], b = state[1], c = state[2], d = state[3];
|
||
|
|
|
||
|
|
OVMS_Decode(t_x, block, 64);
|
||
|
|
|
||
|
|
/* Round 1 */
|
||
|
|
FF (a, b, c, d, t_x[ 0], S11, 0xd76aa478); /* 1 */
|
||
|
|
FF (d, a, b, c, t_x[ 1], S12, 0xe8c7b756); /* 2 */
|
||
|
|
FF (c, d, a, b, t_x[ 2], S13, 0x242070db); /* 3 */
|
||
|
|
FF (b, c, d, a, t_x[ 3], S14, 0xc1bdceee); /* 4 */
|
||
|
|
FF (a, b, c, d, t_x[ 4], S11, 0xf57c0faf); /* 5 */
|
||
|
|
FF (d, a, b, c, t_x[ 5], S12, 0x4787c62a); /* 6 */
|
||
|
|
FF (c, d, a, b, t_x[ 6], S13, 0xa8304613); /* 7 */
|
||
|
|
FF (b, c, d, a, t_x[ 7], S14, 0xfd469501); /* 8 */
|
||
|
|
FF (a, b, c, d, t_x[ 8], S11, 0x698098d8); /* 9 */
|
||
|
|
FF (d, a, b, c, t_x[ 9], S12, 0x8b44f7af); /* 10 */
|
||
|
|
FF (c, d, a, b, t_x[10], S13, 0xffff5bb1); /* 11 */
|
||
|
|
FF (b, c, d, a, t_x[11], S14, 0x895cd7be); /* 12 */
|
||
|
|
FF (a, b, c, d, t_x[12], S11, 0x6b901122); /* 13 */
|
||
|
|
FF (d, a, b, c, t_x[13], S12, 0xfd987193); /* 14 */
|
||
|
|
FF (c, d, a, b, t_x[14], S13, 0xa679438e); /* 15 */
|
||
|
|
FF (b, c, d, a, t_x[15], S14, 0x49b40821); /* 16 */
|
||
|
|
|
||
|
|
/* Round 2 */
|
||
|
|
GG (a, b, c, d, t_x[ 1], S21, 0xf61e2562); /* 17 */
|
||
|
|
GG (d, a, b, c, t_x[ 6], S22, 0xc040b340); /* 18 */
|
||
|
|
GG (c, d, a, b, t_x[11], S23, 0x265e5a51); /* 19 */
|
||
|
|
GG (b, c, d, a, t_x[ 0], S24, 0xe9b6c7aa); /* 20 */
|
||
|
|
GG (a, b, c, d, t_x[ 5], S21, 0xd62f105d); /* 21 */
|
||
|
|
GG (d, a, b, c, t_x[10], S22, 0x2441453); /* 22 */
|
||
|
|
GG (c, d, a, b, t_x[15], S23, 0xd8a1e681); /* 23 */
|
||
|
|
GG (b, c, d, a, t_x[ 4], S24, 0xe7d3fbc8); /* 24 */
|
||
|
|
GG (a, b, c, d, t_x[ 9], S21, 0x21e1cde6); /* 25 */
|
||
|
|
GG (d, a, b, c, t_x[14], S22, 0xc33707d6); /* 26 */
|
||
|
|
GG (c, d, a, b, t_x[ 3], S23, 0xf4d50d87); /* 27 */
|
||
|
|
GG (b, c, d, a, t_x[ 8], S24, 0x455a14ed); /* 28 */
|
||
|
|
GG (a, b, c, d, t_x[13], S21, 0xa9e3e905); /* 29 */
|
||
|
|
GG (d, a, b, c, t_x[ 2], S22, 0xfcefa3f8); /* 30 */
|
||
|
|
GG (c, d, a, b, t_x[ 7], S23, 0x676f02d9); /* 31 */
|
||
|
|
GG (b, c, d, a, t_x[12], S24, 0x8d2a4c8a); /* 32 */
|
||
|
|
|
||
|
|
/* Round 3 */
|
||
|
|
HH (a, b, c, d, t_x[ 5], S31, 0xfffa3942); /* 33 */
|
||
|
|
HH (d, a, b, c, t_x[ 8], S32, 0x8771f681); /* 34 */
|
||
|
|
HH (c, d, a, b, t_x[11], S33, 0x6d9d6122); /* 35 */
|
||
|
|
HH (b, c, d, a, t_x[14], S34, 0xfde5380c); /* 36 */
|
||
|
|
HH (a, b, c, d, t_x[ 1], S31, 0xa4beea44); /* 37 */
|
||
|
|
HH (d, a, b, c, t_x[ 4], S32, 0x4bdecfa9); /* 38 */
|
||
|
|
HH (c, d, a, b, t_x[ 7], S33, 0xf6bb4b60); /* 39 */
|
||
|
|
HH (b, c, d, a, t_x[10], S34, 0xbebfbc70); /* 40 */
|
||
|
|
HH (a, b, c, d, t_x[13], S31, 0x289b7ec6); /* 41 */
|
||
|
|
HH (d, a, b, c, t_x[ 0], S32, 0xeaa127fa); /* 42 */
|
||
|
|
HH (c, d, a, b, t_x[ 3], S33, 0xd4ef3085); /* 43 */
|
||
|
|
HH (b, c, d, a, t_x[ 6], S34, 0x4881d05); /* 44 */
|
||
|
|
HH (a, b, c, d, t_x[ 9], S31, 0xd9d4d039); /* 45 */
|
||
|
|
HH (d, a, b, c, t_x[12], S32, 0xe6db99e5); /* 46 */
|
||
|
|
HH (c, d, a, b, t_x[15], S33, 0x1fa27cf8); /* 47 */
|
||
|
|
HH (b, c, d, a, t_x[ 2], S34, 0xc4ac5665); /* 48 */
|
||
|
|
|
||
|
|
/* Round 4 */
|
||
|
|
II (a, b, c, d, t_x[ 0], S41, 0xf4292244); /* 49 */
|
||
|
|
II (d, a, b, c, t_x[ 7], S42, 0x432aff97); /* 50 */
|
||
|
|
II (c, d, a, b, t_x[14], S43, 0xab9423a7); /* 51 */
|
||
|
|
II (b, c, d, a, t_x[ 5], S44, 0xfc93a039); /* 52 */
|
||
|
|
II (a, b, c, d, t_x[12], S41, 0x655b59c3); /* 53 */
|
||
|
|
II (d, a, b, c, t_x[ 3], S42, 0x8f0ccc92); /* 54 */
|
||
|
|
II (c, d, a, b, t_x[10], S43, 0xffeff47d); /* 55 */
|
||
|
|
II (b, c, d, a, t_x[ 1], S44, 0x85845dd1); /* 56 */
|
||
|
|
II (a, b, c, d, t_x[ 8], S41, 0x6fa87e4f); /* 57 */
|
||
|
|
II (d, a, b, c, t_x[15], S42, 0xfe2ce6e0); /* 58 */
|
||
|
|
II (c, d, a, b, t_x[ 6], S43, 0xa3014314); /* 59 */
|
||
|
|
II (b, c, d, a, t_x[13], S44, 0x4e0811a1); /* 60 */
|
||
|
|
II (a, b, c, d, t_x[ 4], S41, 0xf7537e82); /* 61 */
|
||
|
|
II (d, a, b, c, t_x[11], S42, 0xbd3af235); /* 62 */
|
||
|
|
II (c, d, a, b, t_x[ 2], S43, 0x2ad7d2bb); /* 63 */
|
||
|
|
II (b, c, d, a, t_x[ 9], S44, 0xeb86d391); /* 64 */
|
||
|
|
|
||
|
|
state[0] += a;
|
||
|
|
state[1] += b;
|
||
|
|
state[2] += c;
|
||
|
|
state[3] += d;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Encodes input (uint32_t) into output (uint8_t). Assumes len is
|
||
|
|
* a multiple of 4.
|
||
|
|
*/
|
||
|
|
static void OVMS_Encode(uint8_t *output, uint32_t *input, uint32_t len)
|
||
|
|
{
|
||
|
|
uint32_t i, j;
|
||
|
|
|
||
|
|
for (i = 0, j = 0; j < len; i++, j += 4)
|
||
|
|
{
|
||
|
|
output[j] = (uint8_t)(input[i] & 0xff);
|
||
|
|
output[j+1] = (uint8_t)((input[i] >> 8) & 0xff);
|
||
|
|
output[j+2] = (uint8_t)((input[i] >> 16) & 0xff);
|
||
|
|
output[j+3] = (uint8_t)((input[i] >> 24) & 0xff);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Decodes input (uint8_t) into output (uint32_t). Assumes len is
|
||
|
|
* a multiple of 4.
|
||
|
|
*/
|
||
|
|
static void OVMS_Decode(uint32_t *output, const uint8_t *input, uint32_t len)
|
||
|
|
{
|
||
|
|
uint32_t i, j;
|
||
|
|
|
||
|
|
for (i = 0, j = 0; j < len; i++, j += 4)
|
||
|
|
output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
|
||
|
|
(((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
|
||
|
|
}
|
||
|
|
|