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FFmpeg/libavutil/sha.c

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/*
* Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
* Copyright (C) 2009 Konstantin Shishkov
* based on public domain SHA-1 code by Steve Reid <steve@edmweb.com>
* and on BSD-licensed SHA-2 code by Aaron D. Gifford
*
* 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 "sha.h"
#include "intreadwrite.h"
#include "mem.h"
/** hash context */
typedef struct AVSHA {
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[8]; ///< current hash value
/** function used to update hash for 512-bit input block */
void (*transform)(uint32_t *state, const uint8_t buffer[64]);
} AVSHA;
const int av_sha_size = sizeof(AVSHA);
struct AVSHA *av_sha_alloc(void)
{
return av_mallocz(sizeof(struct AVSHA));
}
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
#define blk0(i) (block[i] = AV_RB32(buffer + 4 * (i)))
#define blk(i) (block[i] = rol(block[(i)-3] ^ block[(i)-8] ^ block[(i)-14] ^ block[(i)-16], 1))
#define R0(v,w,x,y,z,i) z += (((w)&((x)^(y)))^(y)) + blk0(i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
#define R1(v,w,x,y,z,i) z += (((w)&((x)^(y)))^(y)) + blk (i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
#define R2(v,w,x,y,z,i) z += ( (w)^(x) ^(y)) + blk (i) + 0x6ED9EBA1 + rol(v, 5); w = rol(w, 30);
#define R3(v,w,x,y,z,i) z += ((((w)|(x))&(y))|((w)&(x))) + blk (i) + 0x8F1BBCDC + rol(v, 5); w = rol(w, 30);
#define R4(v,w,x,y,z,i) z += ( (w)^(x) ^(y)) + blk (i) + 0xCA62C1D6 + rol(v, 5); w = rol(w, 30);
/* Hash a single 512-bit block. This is the core of the algorithm. */
static void sha1_transform(uint32_t state[5], const uint8_t buffer[64])
{
uint32_t block[80];
unsigned int i, a, b, c, d, e;
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
#if CONFIG_SMALL
for (i = 0; i < 80; i++) {
int t;
if (i < 16)
t = AV_RB32(buffer + 4 * i);
else
t = rol(block[i-3] ^ block[i-8] ^ block[i-14] ^ block[i-16], 1);
block[i] = t;
t += e + rol(a, 5);
if (i < 40) {
if (i < 20)
t += ((b&(c^d))^d) + 0x5A827999;
else
t += ( b^c ^d) + 0x6ED9EBA1;
} else {
if (i < 60)
t += (((b|c)&d)|(b&c)) + 0x8F1BBCDC;
else
t += ( b^c ^d) + 0xCA62C1D6;
}
e = d;
d = c;
c = rol(b, 30);
b = a;
a = t;
}
#else
#define R1_0 \
R0(a, b, c, d, e, 0 + i); \
R0(e, a, b, c, d, 1 + i); \
R0(d, e, a, b, c, 2 + i); \
R0(c, d, e, a, b, 3 + i); \
R0(b, c, d, e, a, 4 + i); \
i += 5
i = 0;
R1_0; R1_0; R1_0;
R0(a, b, c, d, e, 15);
R1(e, a, b, c, d, 16);
R1(d, e, a, b, c, 17);
R1(c, d, e, a, b, 18);
R1(b, c, d, e, a, 19);
#define R1_20 \
R2(a, b, c, d, e, 0 + i); \
R2(e, a, b, c, d, 1 + i); \
R2(d, e, a, b, c, 2 + i); \
R2(c, d, e, a, b, 3 + i); \
R2(b, c, d, e, a, 4 + i); \
i += 5
i = 20;
R1_20; R1_20; R1_20; R1_20;
#define R1_40 \
R3(a, b, c, d, e, 0 + i); \
R3(e, a, b, c, d, 1 + i); \
R3(d, e, a, b, c, 2 + i); \
R3(c, d, e, a, b, 3 + i); \
R3(b, c, d, e, a, 4 + i); \
i += 5
R1_40; R1_40; R1_40; R1_40;
#define R1_60 \
R4(a, b, c, d, e, 0 + i); \
R4(e, a, b, c, d, 1 + i); \
R4(d, e, a, b, c, 2 + i); \
R4(c, d, e, a, b, 3 + i); \
R4(b, c, d, e, a, 4 + i); \
i += 5
R1_60; R1_60; R1_60; R1_60;
#endif
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
}
static const uint32_t K256[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
#define Ch(x,y,z) (((x) & ((y) ^ (z))) ^ (z))
#define Maj(z,y,x) ((((x) | (y)) & (z)) | ((x) & (y)))
#define Sigma0_256(x) (rol((x), 30) ^ rol((x), 19) ^ rol((x), 10))
#define Sigma1_256(x) (rol((x), 26) ^ rol((x), 21) ^ rol((x), 7))
#define sigma0_256(x) (rol((x), 25) ^ rol((x), 14) ^ ((x) >> 3))
#define sigma1_256(x) (rol((x), 15) ^ rol((x), 13) ^ ((x) >> 10))
#undef blk
#define blk(i) (block[i] = block[i - 16] + sigma0_256(block[i - 15]) + \
sigma1_256(block[i - 2]) + block[i - 7])
#define ROUND256(a,b,c,d,e,f,g,h) \
T1 += (h) + Sigma1_256(e) + Ch((e), (f), (g)) + K256[i]; \
(d) += T1; \
(h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
i++
#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) \
T1 = blk0(i); \
ROUND256(a,b,c,d,e,f,g,h)
#define ROUND256_16_TO_63(a,b,c,d,e,f,g,h) \
T1 = blk(i); \
ROUND256(a,b,c,d,e,f,g,h)
static void sha256_transform(uint32_t *state, const uint8_t buffer[64])
{
unsigned int i, a, b, c, d, e, f, g, h;
uint32_t block[64];
uint32_t T1;
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
f = state[5];
g = state[6];
h = state[7];
#if CONFIG_SMALL
for (i = 0; i < 64; i++) {
uint32_t T2;
if (i < 16)
T1 = blk0(i);
else
T1 = blk(i);
T1 += h + Sigma1_256(e) + Ch(e, f, g) + K256[i];
T2 = Sigma0_256(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
}
#else
i = 0;
#define R256_0 \
ROUND256_0_TO_15(a, b, c, d, e, f, g, h); \
ROUND256_0_TO_15(h, a, b, c, d, e, f, g); \
ROUND256_0_TO_15(g, h, a, b, c, d, e, f); \
ROUND256_0_TO_15(f, g, h, a, b, c, d, e); \
ROUND256_0_TO_15(e, f, g, h, a, b, c, d); \
ROUND256_0_TO_15(d, e, f, g, h, a, b, c); \
ROUND256_0_TO_15(c, d, e, f, g, h, a, b); \
ROUND256_0_TO_15(b, c, d, e, f, g, h, a)
R256_0; R256_0;
#define R256_16 \
ROUND256_16_TO_63(a, b, c, d, e, f, g, h); \
ROUND256_16_TO_63(h, a, b, c, d, e, f, g); \
ROUND256_16_TO_63(g, h, a, b, c, d, e, f); \
ROUND256_16_TO_63(f, g, h, a, b, c, d, e); \
ROUND256_16_TO_63(e, f, g, h, a, b, c, d); \
ROUND256_16_TO_63(d, e, f, g, h, a, b, c); \
ROUND256_16_TO_63(c, d, e, f, g, h, a, b); \
ROUND256_16_TO_63(b, c, d, e, f, g, h, a)
R256_16; R256_16; R256_16;
R256_16; R256_16; R256_16;
#endif
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
state[5] += f;
state[6] += g;
state[7] += h;
}
av_cold int av_sha_init(AVSHA *ctx, int bits)
{
ctx->digest_len = bits >> 5;
switch (bits) {
case 160: // SHA-1
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0xC3D2E1F0;
ctx->transform = sha1_transform;
break;
case 224: // SHA-224
ctx->state[0] = 0xC1059ED8;
ctx->state[1] = 0x367CD507;
ctx->state[2] = 0x3070DD17;
ctx->state[3] = 0xF70E5939;
ctx->state[4] = 0xFFC00B31;
ctx->state[5] = 0x68581511;
ctx->state[6] = 0x64F98FA7;
ctx->state[7] = 0xBEFA4FA4;
ctx->transform = sha256_transform;
break;
case 256: // SHA-256
ctx->state[0] = 0x6A09E667;
ctx->state[1] = 0xBB67AE85;
ctx->state[2] = 0x3C6EF372;
ctx->state[3] = 0xA54FF53A;
ctx->state[4] = 0x510E527F;
ctx->state[5] = 0x9B05688C;
ctx->state[6] = 0x1F83D9AB;
ctx->state[7] = 0x5BE0CD19;
ctx->transform = sha256_transform;
break;
default:
return AVERROR(EINVAL);
}
ctx->count = 0;
return 0;
}
void av_sha_update(struct AVSHA *ctx, const uint8_t *data, size_t len)
{
unsigned int j;
size_t i;
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);
j = 0;
}
}
#else
if (len >= 64 - j) {
const uint8_t *end;
memcpy(&ctx->buffer[j], data, (i = 64 - j));
ctx->transform(ctx->state, ctx->buffer);
data += i;
len -= i;
end = data + (len & ~63);
len = len % 64;
for (; data < end; data += 64)
ctx->transform(ctx->state, data);
j = 0;
}
memcpy(&ctx->buffer[j], data, len);
#endif
}
void av_sha_final(AVSHA* ctx, uint8_t *digest)
{
int i;
uint64_t finalcount = av_be2ne64(ctx->count << 3);
av_sha_update(ctx, "\200", 1);
while ((ctx->count & 63) != 56)
av_sha_update(ctx, "", 1);
av_sha_update(ctx, (uint8_t *)&finalcount, 8); /* Should cause a transform() */
for (i = 0; i < ctx->digest_len; i++)
AV_WB32(digest + i*4, ctx->state[i]);
}