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FFmpeg/libavutil/ripemd.c
Michael Niedermayer b6ce50a2d4 avutil/ripemd: adjust loop condition to silence CID1035716 
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-06-22 14:52:29 +02:00

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/*
* Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
* Copyright (C) 2013 James Almer
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "attributes.h"
#include "avutil.h"
#include "bswap.h"
#include "intreadwrite.h"
#include "ripemd.h"
#include "mem.h"
/** hash context */
typedef struct AVRIPEMD {
uint8_t digest_len; ///< digest length in 32-bit words
uint64_t count; ///< number of bytes in buffer
uint8_t buffer[64]; ///< 512-bit buffer of input values used in hash updating
uint32_t state[10]; ///< current hash value
uint8_t ext; ///< extension (0 for 128 and 160, 1 for 256 and 320)
/** function used to update hash for 512-bit input block */
void (*transform)(uint32_t *state, const uint8_t buffer[64], int ext);
} AVRIPEMD;
const int av_ripemd_size = sizeof(AVRIPEMD);
struct AVRIPEMD *av_ripemd_alloc(void)
{
return av_mallocz(sizeof(struct AVRIPEMD));
}
static const uint32_t KA[4] = {
0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xa953fd4e
};
static const uint32_t KB[4] = {
0x50a28be6, 0x5c4dd124, 0x6d703ef3, 0x7a6d76e9
};
static const int ROTA[80] = {
11, 14, 15, 12, 5, 8, 7 , 9, 11, 13, 14, 15, 6, 7, 9, 8,
7 , 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6
};
static const int ROTB[80] = {
8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11
};
static const int WA[80] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13
};
static const int WB[80] = {
5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11
};
#define rol(value, bits) ((value << bits) | (value >> (32 - bits)))
#define SWAP(a,b) if (ext) { int t = a; a = b; b = t; }
#define ROUND128_0_TO_15(a,b,c,d,e,f,g,h) \
a = rol(a + (( b ^ c ^ d) + block[WA[n]]), ROTA[n]); \
e = rol(e + ((((f ^ g) & h) ^ g) + block[WB[n]] + KB[0]), ROTB[n]); \
n++
#define ROUND128_16_TO_31(a,b,c,d,e,f,g,h) \
a = rol(a + ((((c ^ d) & b) ^ d) + block[WA[n]] + KA[0]), ROTA[n]); \
e = rol(e + (((~g | f) ^ h) + block[WB[n]] + KB[1]), ROTB[n]); \
n++
#define ROUND128_32_TO_47(a,b,c,d,e,f,g,h) \
a = rol(a + (((~c | b) ^ d) + block[WA[n]] + KA[1]), ROTA[n]); \
e = rol(e + ((((g ^ h) & f) ^ h) + block[WB[n]] + KB[2]), ROTB[n]); \
n++
#define ROUND128_48_TO_63(a,b,c,d,e,f,g,h) \
a = rol(a + ((((b ^ c) & d) ^ c) + block[WA[n]] + KA[2]), ROTA[n]); \
e = rol(e + (( f ^ g ^ h) + block[WB[n]]), ROTB[n]); \
n++
static void ripemd128_transform(uint32_t *state, const uint8_t buffer[64], int ext)
{
uint32_t a, b, c, d, e, f, g, h;
uint32_t block[16];
int n;
if (ext) {
a = state[0]; b = state[1]; c = state[2]; d = state[3];
e = state[4]; f = state[5]; g = state[6]; h = state[7];
} else {
a = e = state[0];
b = f = state[1];
c = g = state[2];
d = h = state[3];
}
for (n = 0; n < 16; n++)
block[n] = AV_RL32(buffer + 4 * n);
for (n = 0; n < 16;) {
ROUND128_0_TO_15(a,b,c,d,e,f,g,h);
ROUND128_0_TO_15(d,a,b,c,h,e,f,g);
ROUND128_0_TO_15(c,d,a,b,g,h,e,f);
ROUND128_0_TO_15(b,c,d,a,f,g,h,e);
}
SWAP(a,e)
for (; n < 32;) {
ROUND128_16_TO_31(a,b,c,d,e,f,g,h);
ROUND128_16_TO_31(d,a,b,c,h,e,f,g);
ROUND128_16_TO_31(c,d,a,b,g,h,e,f);
ROUND128_16_TO_31(b,c,d,a,f,g,h,e);
}
SWAP(b,f)
for (; n < 48;) {
ROUND128_32_TO_47(a,b,c,d,e,f,g,h);
ROUND128_32_TO_47(d,a,b,c,h,e,f,g);
ROUND128_32_TO_47(c,d,a,b,g,h,e,f);
ROUND128_32_TO_47(b,c,d,a,f,g,h,e);
}
SWAP(c,g)
for (; n < 64;) {
ROUND128_48_TO_63(a,b,c,d,e,f,g,h);
ROUND128_48_TO_63(d,a,b,c,h,e,f,g);
ROUND128_48_TO_63(c,d,a,b,g,h,e,f);
ROUND128_48_TO_63(b,c,d,a,f,g,h,e);
}
SWAP(d,h)
if (ext) {
state[0] += a; state[1] += b; state[2] += c; state[3] += d;
state[4] += e; state[5] += f; state[6] += g; state[7] += h;
} else {
h += c + state[1];
state[1] = state[2] + d + e;
state[2] = state[3] + a + f;
state[3] = state[0] + b + g;
state[0] = h;
}
}
#define ROTATE(x,y) \
x = rol(x, 10); \
y = rol(y, 10); \
n++
#define ROUND160_0_TO_15(a,b,c,d,e,f,g,h,i,j) \
a = rol(a + (( b ^ c ^ d) + block[WA[n]]), ROTA[n]) + e; \
f = rol(f + (((~i | h) ^ g) + block[WB[n]] + KB[0]), ROTB[n]) + j; \
ROTATE(c,h)
#define ROUND160_16_TO_31(a,b,c,d,e,f,g,h,i,j) \
a = rol(a + ((((c ^ d) & b) ^ d) + block[WA[n]] + KA[0]), ROTA[n]) + e; \
f = rol(f + ((((g ^ h) & i) ^ h) + block[WB[n]] + KB[1]), ROTB[n]) + j; \
ROTATE(c,h)
#define ROUND160_32_TO_47(a,b,c,d,e,f,g,h,i,j) \
a = rol(a + (((~c | b) ^ d) + block[WA[n]] + KA[1]), ROTA[n]) + e; \
f = rol(f + (((~h | g) ^ i) + block[WB[n]] + KB[2]), ROTB[n]) + j; \
ROTATE(c,h)
#define ROUND160_48_TO_63(a,b,c,d,e,f,g,h,i,j) \
a = rol(a + ((((b ^ c) & d) ^ c) + block[WA[n]] + KA[2]), ROTA[n]) + e; \
f = rol(f + ((((h ^ i) & g) ^ i) + block[WB[n]] + KB[3]), ROTB[n]) + j; \
ROTATE(c,h)
#define ROUND160_64_TO_79(a,b,c,d,e,f,g,h,i,j) \
a = rol(a + (((~d | c) ^ b) + block[WA[n]] + KA[3]), ROTA[n]) + e; \
f = rol(f + (( g ^ h ^ i) + block[WB[n]]), ROTB[n]) + j; \
ROTATE(c,h)
static void ripemd160_transform(uint32_t *state, const uint8_t buffer[64], int ext)
{
uint32_t a, b, c, d, e, f, g, h, i, j;
uint32_t block[16];
int n;
if (ext) {
a = state[0]; b = state[1]; c = state[2]; d = state[3]; e = state[4];
f = state[5]; g = state[6]; h = state[7]; i = state[8]; j = state[9];
} else {
a = f = state[0];
b = g = state[1];
c = h = state[2];
d = i = state[3];
e = j = state[4];
}
for (n = 0; n < 16; n++)
block[n] = AV_RL32(buffer + 4 * n);
for (n = 0; n < 16 - 1;) {
ROUND160_0_TO_15(a,b,c,d,e,f,g,h,i,j);
ROUND160_0_TO_15(e,a,b,c,d,j,f,g,h,i);
ROUND160_0_TO_15(d,e,a,b,c,i,j,f,g,h);
ROUND160_0_TO_15(c,d,e,a,b,h,i,j,f,g);
ROUND160_0_TO_15(b,c,d,e,a,g,h,i,j,f);
}
ROUND160_0_TO_15(a,b,c,d,e,f,g,h,i,j);
SWAP(a,f)
for (; n < 32 - 1;) {
ROUND160_16_TO_31(e,a,b,c,d,j,f,g,h,i);
ROUND160_16_TO_31(d,e,a,b,c,i,j,f,g,h);
ROUND160_16_TO_31(c,d,e,a,b,h,i,j,f,g);
ROUND160_16_TO_31(b,c,d,e,a,g,h,i,j,f);
ROUND160_16_TO_31(a,b,c,d,e,f,g,h,i,j);
}
ROUND160_16_TO_31(e,a,b,c,d,j,f,g,h,i);
SWAP(b,g)
for (; n < 48 - 1;) {
ROUND160_32_TO_47(d,e,a,b,c,i,j,f,g,h);
ROUND160_32_TO_47(c,d,e,a,b,h,i,j,f,g);
ROUND160_32_TO_47(b,c,d,e,a,g,h,i,j,f);
ROUND160_32_TO_47(a,b,c,d,e,f,g,h,i,j);
ROUND160_32_TO_47(e,a,b,c,d,j,f,g,h,i);
}
ROUND160_32_TO_47(d,e,a,b,c,i,j,f,g,h);
SWAP(c,h)
for (; n < 64 - 1;) {
ROUND160_48_TO_63(c,d,e,a,b,h,i,j,f,g);
ROUND160_48_TO_63(b,c,d,e,a,g,h,i,j,f);
ROUND160_48_TO_63(a,b,c,d,e,f,g,h,i,j);
ROUND160_48_TO_63(e,a,b,c,d,j,f,g,h,i);
ROUND160_48_TO_63(d,e,a,b,c,i,j,f,g,h);
}
ROUND160_48_TO_63(c,d,e,a,b,h,i,j,f,g);
SWAP(d,i)
for (; n < 75;) {
ROUND160_64_TO_79(b,c,d,e,a,g,h,i,j,f);
ROUND160_64_TO_79(a,b,c,d,e,f,g,h,i,j);
ROUND160_64_TO_79(e,a,b,c,d,j,f,g,h,i);
ROUND160_64_TO_79(d,e,a,b,c,i,j,f,g,h);
ROUND160_64_TO_79(c,d,e,a,b,h,i,j,f,g);
}
ROUND160_64_TO_79(b,c,d,e,a,g,h,i,j,f);
SWAP(e,j)
if (ext) {
state[0] += a; state[1] += b; state[2] += c; state[3] += d; state[4] += e;
state[5] += f; state[6] += g; state[7] += h; state[8] += i; state[9] += j;
} else {
i += c + state[1];
state[1] = state[2] + d + j;
state[2] = state[3] + e + f;
state[3] = state[4] + a + g;
state[4] = state[0] + b + h;
state[0] = i;
}
}
av_cold int av_ripemd_init(AVRIPEMD *ctx, int bits)
{
ctx->digest_len = bits >> 5;
switch (bits) {
case 128: // RIPEMD-128
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->transform = ripemd128_transform;
ctx->ext = 0;
break;
case 160: // RIPEMD-160
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0xC3D2E1F0;
ctx->transform = ripemd160_transform;
ctx->ext = 0;
break;
case 256: // RIPEMD-256
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0x76543210;
ctx->state[5] = 0xFEDCBA98;
ctx->state[6] = 0x89ABCDEF;
ctx->state[7] = 0x01234567;
ctx->transform = ripemd128_transform;
ctx->ext = 1;
break;
case 320: // RIPEMD-320
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0xC3D2E1F0;
ctx->state[5] = 0x76543210;
ctx->state[6] = 0xFEDCBA98;
ctx->state[7] = 0x89ABCDEF;
ctx->state[8] = 0x01234567;
ctx->state[9] = 0x3C2D1E0F;
ctx->transform = ripemd160_transform;
ctx->ext = 1;
break;
default:
return -1;
}
ctx->count = 0;
return 0;
}
void av_ripemd_update(AVRIPEMD* ctx, const uint8_t* data, unsigned int len)
{
unsigned int i, j;
j = ctx->count & 63;
ctx->count += len;
#if CONFIG_SMALL
for (i = 0; i < len; i++) {
ctx->buffer[j++] = data[i];
if (64 == j) {
ctx->transform(ctx->state, ctx->buffer, ctx->ext);
j = 0;
}
}
#else
if ((j + len) > 63) {
memcpy(&ctx->buffer[j], data, (i = 64 - j));
ctx->transform(ctx->state, ctx->buffer, ctx->ext);
for (; i + 63 < len; i += 64)
ctx->transform(ctx->state, &data[i], ctx->ext);
j = 0;
} else
i = 0;
memcpy(&ctx->buffer[j], &data[i], len - i);
#endif
}
void av_ripemd_final(AVRIPEMD* ctx, uint8_t *digest)
{
int i;
uint64_t finalcount = av_le2ne64(ctx->count << 3);
av_ripemd_update(ctx, "\200", 1);
while ((ctx->count & 63) != 56)
av_ripemd_update(ctx, "", 1);
av_ripemd_update(ctx, (uint8_t *)&finalcount, 8); /* Should cause a transform() */
for (i = 0; i < ctx->digest_len; i++)
AV_WL32(digest + i*4, ctx->state[i]);
}
#ifdef TEST
#include <stdio.h>
int main(void)
{
int i, j, k;
AVRIPEMD ctx;
unsigned char digest[40];
const int lengths[4] = { 128, 160, 256, 320 };
for (j = 0; j < 4; j++) {
printf("Testing RIPEMD-%d\n", lengths[j]);
for (k = 0; k < 3; k++) {
av_ripemd_init(&ctx, lengths[j]);
if (k == 0)
av_ripemd_update(&ctx, "abc", 3);
else if (k == 1)
av_ripemd_update(&ctx, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56);
else
for (i = 0; i < 1000*1000; i++)
av_ripemd_update(&ctx, "a", 1);
av_ripemd_final(&ctx, digest);
for (i = 0; i < lengths[j] >> 3; i++)
printf("%02X", digest[i]);
putchar('\n');
}
switch (j) { //test vectors (from ISO:IEC 10118-3 (2004) and http://homes.esat.kuleuven.be/~bosselae/ripemd160.html)
case 0:
printf("c14a1219 9c66e4ba 84636b0f 69144c77\n"
"a1aa0689 d0fafa2d dc22e88b 49133a06\n"
"4a7f5723 f954eba1 216c9d8f 6320431f\n");
break;
case 1:
printf("8eb208f7 e05d987a 9b044a8e 98c6b087 f15a0bfc\n"
"12a05338 4a9c0c88 e405a06c 27dcf49a da62eb2b\n"
"52783243 c1697bdb e16d37f9 7f68f083 25dc1528\n");
break;
case 2:
printf("afbd6e22 8b9d8cbb cef5ca2d 03e6dba1 0ac0bc7d cbe4680e 1e42d2e9 75459b65\n"
"38430455 83aac6c8 c8d91285 73e7a980 9afb2a0f 34ccc36e a9e72f16 f6368e3f\n"
"ac953744 e10e3151 4c150d4d 8d7b6773 42e33399 788296e4 3ae4850c e4f97978\n");
break;
case 3:
printf("de4c01b3 054f8930 a79d09ae 738e9230 1e5a1708 5beffdc1 b8d11671 3e74f82f a942d64c dbc4682d\n"
"d034a795 0cf72202 1ba4b84d f769a5de 2060e259 df4c9bb4 a4268c0e 935bbc74 70a969c9 d072a1ac\n"
"bdee37f4 371e2064 6b8b0d86 2dda1629 2ae36f40 965e8c85 09e63d1d bddecc50 3e2b63eb 9245bb66\n");
break;
}
}
return 0;
}
#endif
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