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md5.c
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md5.c
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#include <string.h>
#include "md5.h"
/* ==========================================================================
* Function: md5str ( instr )
* Purpose: returns null-terminated character string containing
* md5 hash of instr (input string)
* --------------------------------------------------------------------------
* Arguments: instr (I) pointer to null-terminated char string
* containing input string whose md5 hash
* is desired
* --------------------------------------------------------------------------
* Returns: ( char * ) ptr to null-terminated 32-character
* md5 hash of instr
* --------------------------------------------------------------------------
* Notes: o Other md5 library functions are included below.
* They're all taken from Christophe Devine's code,
* which (as of 04-Aug-2004) is available from
* http://www.cr0.net:8040/code/crypto/md5/
* o The P,F,S macros in the original code are replaced
* by four functions P1()...P4() to accommodate a problem
* with Compaq's vax/vms C compiler.
* ======================================================================= */
#define GET_UINT32(n,b,i) \
{ (n) = ( (uint32_t) (b)[(i) ] ) \
| ( (uint32_t) (b)[(i) + 1] << 8 ) \
| ( (uint32_t) (b)[(i) + 2] << 16 ) \
| ( (uint32_t) (b)[(i) + 3] << 24 ); }
#define PUT_UINT32(n,b,i) \
{ (b)[(i) ] = (uint8_t) ( (n) ); \
(b)[(i) + 1] = (uint8_t) ( (n) >> 8 ); \
(b)[(i) + 2] = (uint8_t) ( (n) >> 16 ); \
(b)[(i) + 3] = (uint8_t) ( (n) >> 24 ); }
/* --- P,S,F macros defined as functions --- */
static void P1(uint32_t *X, uint32_t *a, uint32_t b, uint32_t c, uint32_t d, int k, int s, uint32_t t)
{
*a += (uint32_t)(d ^(b & (c ^ d))) + X[k] + t;
*a = ((*a << s) | ((*a & 0xFFFFFFFF) >> (32 - s))) + b;
return;
}
static void P2(uint32_t *X, uint32_t *a, uint32_t b, uint32_t c, uint32_t d, int k, int s, uint32_t t)
{
*a += (uint32_t)(c ^(d & (b ^ c))) + X[k] + t;
*a = ((*a << s) | ((*a & 0xFFFFFFFF) >> (32 - s))) + b;
return;
}
static void P3(uint32_t *X, uint32_t *a, uint32_t b, uint32_t c, uint32_t d, int k, int s, uint32_t t)
{
*a += (uint32_t)(b ^ c ^ d) + X[k] + t;
*a = ((*a << s) | ((*a & 0xFFFFFFFF) >> (32 - s))) + b;
return;
}
static void P4(uint32_t *X, uint32_t *a, uint32_t b, uint32_t c, uint32_t d, int k, int s, uint32_t t)
{
*a += (uint32_t)(c ^(b | ~d)) + X[k] + t;
*a = ((*a << s) | ((*a & 0xFFFFFFFF) >> (32 - s))) + b;
return;
}
/* --- entry point (all md5 functions below by Christophe Devine) --- */
void md5_starts(md5_context *ctx)
{
ctx->total[0] = 0;
ctx->total[1] = 0;
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
}
static void md5_process(md5_context *ctx, uint8_t data[64])
{
uint32_t X[16], A, B, C, D;
GET_UINT32(X[0], data, 0);
GET_UINT32(X[1], data, 4);
GET_UINT32(X[2], data, 8);
GET_UINT32(X[3], data, 12);
GET_UINT32(X[4], data, 16);
GET_UINT32(X[5], data, 20);
GET_UINT32(X[6], data, 24);
GET_UINT32(X[7], data, 28);
GET_UINT32(X[8], data, 32);
GET_UINT32(X[9], data, 36);
GET_UINT32(X[10], data, 40);
GET_UINT32(X[11], data, 44);
GET_UINT32(X[12], data, 48);
GET_UINT32(X[13], data, 52);
GET_UINT32(X[14], data, 56);
GET_UINT32(X[15], data, 60);
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
P1(X, &A, B, C, D, 0, 7, 0xD76AA478);
P1(X, &D, A, B, C, 1, 12, 0xE8C7B756);
P1(X, &C, D, A, B, 2, 17, 0x242070DB);
P1(X, &B, C, D, A, 3, 22, 0xC1BDCEEE);
P1(X, &A, B, C, D, 4, 7, 0xF57C0FAF);
P1(X, &D, A, B, C, 5, 12, 0x4787C62A);
P1(X, &C, D, A, B, 6, 17, 0xA8304613);
P1(X, &B, C, D, A, 7, 22, 0xFD469501);
P1(X, &A, B, C, D, 8, 7, 0x698098D8);
P1(X, &D, A, B, C, 9, 12, 0x8B44F7AF);
P1(X, &C, D, A, B, 10, 17, 0xFFFF5BB1);
P1(X, &B, C, D, A, 11, 22, 0x895CD7BE);
P1(X, &A, B, C, D, 12, 7, 0x6B901122);
P1(X, &D, A, B, C, 13, 12, 0xFD987193);
P1(X, &C, D, A, B, 14, 17, 0xA679438E);
P1(X, &B, C, D, A, 15, 22, 0x49B40821);
P2(X, &A, B, C, D, 1, 5, 0xF61E2562);
P2(X, &D, A, B, C, 6, 9, 0xC040B340);
P2(X, &C, D, A, B, 11, 14, 0x265E5A51);
P2(X, &B, C, D, A, 0, 20, 0xE9B6C7AA);
P2(X, &A, B, C, D, 5, 5, 0xD62F105D);
P2(X, &D, A, B, C, 10, 9, 0x02441453);
P2(X, &C, D, A, B, 15, 14, 0xD8A1E681);
P2(X, &B, C, D, A, 4, 20, 0xE7D3FBC8);
P2(X, &A, B, C, D, 9, 5, 0x21E1CDE6);
P2(X, &D, A, B, C, 14, 9, 0xC33707D6);
P2(X, &C, D, A, B, 3, 14, 0xF4D50D87);
P2(X, &B, C, D, A, 8, 20, 0x455A14ED);
P2(X, &A, B, C, D, 13, 5, 0xA9E3E905);
P2(X, &D, A, B, C, 2, 9, 0xFCEFA3F8);
P2(X, &C, D, A, B, 7, 14, 0x676F02D9);
P2(X, &B, C, D, A, 12, 20, 0x8D2A4C8A);
P3(X, &A, B, C, D, 5, 4, 0xFFFA3942);
P3(X, &D, A, B, C, 8, 11, 0x8771F681);
P3(X, &C, D, A, B, 11, 16, 0x6D9D6122);
P3(X, &B, C, D, A, 14, 23, 0xFDE5380C);
P3(X, &A, B, C, D, 1, 4, 0xA4BEEA44);
P3(X, &D, A, B, C, 4, 11, 0x4BDECFA9);
P3(X, &C, D, A, B, 7, 16, 0xF6BB4B60);
P3(X, &B, C, D, A, 10, 23, 0xBEBFBC70);
P3(X, &A, B, C, D, 13, 4, 0x289B7EC6);
P3(X, &D, A, B, C, 0, 11, 0xEAA127FA);
P3(X, &C, D, A, B, 3, 16, 0xD4EF3085);
P3(X, &B, C, D, A, 6, 23, 0x04881D05);
P3(X, &A, B, C, D, 9, 4, 0xD9D4D039);
P3(X, &D, A, B, C, 12, 11, 0xE6DB99E5);
P3(X, &C, D, A, B, 15, 16, 0x1FA27CF8);
P3(X, &B, C, D, A, 2, 23, 0xC4AC5665);
P4(X, &A, B, C, D, 0, 6, 0xF4292244);
P4(X, &D, A, B, C, 7, 10, 0x432AFF97);
P4(X, &C, D, A, B, 14, 15, 0xAB9423A7);
P4(X, &B, C, D, A, 5, 21, 0xFC93A039);
P4(X, &A, B, C, D, 12, 6, 0x655B59C3);
P4(X, &D, A, B, C, 3, 10, 0x8F0CCC92);
P4(X, &C, D, A, B, 10, 15, 0xFFEFF47D);
P4(X, &B, C, D, A, 1, 21, 0x85845DD1);
P4(X, &A, B, C, D, 8, 6, 0x6FA87E4F);
P4(X, &D, A, B, C, 15, 10, 0xFE2CE6E0);
P4(X, &C, D, A, B, 6, 15, 0xA3014314);
P4(X, &B, C, D, A, 13, 21, 0x4E0811A1);
P4(X, &A, B, C, D, 4, 6, 0xF7537E82);
P4(X, &D, A, B, C, 11, 10, 0xBD3AF235);
P4(X, &C, D, A, B, 2, 15, 0x2AD7D2BB);
P4(X, &B, C, D, A, 9, 21, 0xEB86D391);
ctx->state[0] += A;
ctx->state[1] += B;
ctx->state[2] += C;
ctx->state[3] += D;
}
void md5_update(md5_context *ctx, uint8_t *input, uint32_t length)
{
uint32_t left, fill;
if (length < 1) return;
left = ctx->total[0] & 0x3F;
fill = 64 - left;
ctx->total[0] += length;
ctx->total[0] &= 0xFFFFFFFF;
if (ctx->total[0] < length)
ctx->total[1]++;
if (left && length >= fill) {
memcpy((void *)(ctx->buffer + left),
(void *) input, fill);
md5_process(ctx, ctx->buffer);
length -= fill;
input += fill;
left = 0;
}
while (length >= 64) {
md5_process(ctx, input);
length -= 64;
input += 64;
}
if (length >= 1)
memcpy((void *)(ctx->buffer + left),
(void *) input, length);
}
void md5_finish(md5_context *ctx, uint8_t digest[16])
{
static uint8_t md5_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
};
uint32_t last, padn;
uint32_t high, low;
uint8_t msglen[8];
high = (ctx->total[0] >> 29) | (ctx->total[1] << 3);
low = (ctx->total[0] << 3);
PUT_UINT32(low, msglen, 0);
PUT_UINT32(high, msglen, 4);
last = ctx->total[0] & 0x3F;
padn = (last < 56) ? (56 - last) : (120 - last);
md5_update(ctx, md5_padding, padn);
md5_update(ctx, msglen, 8);
PUT_UINT32(ctx->state[0], digest, 0);
PUT_UINT32(ctx->state[1], digest, 4);
PUT_UINT32(ctx->state[2], digest, 8);
PUT_UINT32(ctx->state[3], digest, 12);
}