libavutil/ripemd.c
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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
     /** function used to update hash for 512-bit input block */
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     void     (*transform)(uint32_t *state, const uint8_t buffer[64]);
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 } 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
 };
 
fab1562a
 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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 #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++
 
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 #define R128_0                          \
     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)
 
 #define R128_16                         \
     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)
 
 #define R128_32                         \
     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)
 
 #define R128_48                         \
     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)
 
 static void ripemd128_transform(uint32_t *state, const uint8_t buffer[64])
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 {
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     uint32_t a, b, c, d, e, f, g, h, av_unused t;
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     uint32_t block[16];
     int n;
 
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     a = e = state[0];
     b = f = state[1];
     c = g = state[2];
     d = h = state[3];
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     for (n = 0; n < 16; n++)
         block[n] = AV_RL32(buffer + 4 * n);
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     n = 0;
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 #if CONFIG_SMALL
     for (; n < 16;) {
         ROUND128_0_TO_15(a,b,c,d,e,f,g,h);
         t = d; d = c; c = b; b = a; a = t;
         t = h; h = g; g = f; f = e; e = t;
     }
 
     for (; n < 32;) {
         ROUND128_16_TO_31(a,b,c,d,e,f,g,h);
         t = d; d = c; c = b; b = a; a = t;
         t = h; h = g; g = f; f = e; e = t;
     }
 
     for (; n < 48;) {
         ROUND128_32_TO_47(a,b,c,d,e,f,g,h);
         t = d; d = c; c = b; b = a; a = t;
         t = h; h = g; g = f; f = e; e = t;
     }
 
     for (; n < 64;) {
         ROUND128_48_TO_63(a,b,c,d,e,f,g,h);
         t = d; d = c; c = b; b = a; a = t;
         t = h; h = g; g = f; f = e; e = t;
     }
 #else
 
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     R128_0; R128_0; R128_0; R128_0;
 
     R128_16; R128_16; R128_16; R128_16;
 
     R128_32; R128_32; R128_32; R128_32;
 
     R128_48; R128_48; R128_48; R128_48;
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 #endif
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     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;
 }
 
 static void ripemd256_transform(uint32_t *state, const uint8_t buffer[64])
 {
     uint32_t a, b, c, d, e, f, g, h, av_unused t;
     uint32_t block[16];
     int n;
 
     a = state[0]; b = state[1]; c = state[2]; d = state[3];
     e = state[4]; f = state[5]; g = state[6]; h = state[7];
 
     for (n = 0; n < 16; n++)
         block[n] = AV_RL32(buffer + 4 * n);
     n = 0;
 
 #if CONFIG_SMALL
     for (; n < 16;) {
         ROUND128_0_TO_15(a,b,c,d,e,f,g,h);
         t = d; d = c; c = b; b = a; a = t;
         t = h; h = g; g = f; f = e; e = t;
     }
     FFSWAP(uint32_t, a, e);
 
     for (; n < 32;) {
         ROUND128_16_TO_31(a,b,c,d,e,f,g,h);
         t = d; d = c; c = b; b = a; a = t;
         t = h; h = g; g = f; f = e; e = t;
     }
     FFSWAP(uint32_t, b, f);
 
     for (; n < 48;) {
         ROUND128_32_TO_47(a,b,c,d,e,f,g,h);
         t = d; d = c; c = b; b = a; a = t;
         t = h; h = g; g = f; f = e; e = t;
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     }
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     FFSWAP(uint32_t, c, g);
 
     for (; n < 64;) {
         ROUND128_48_TO_63(a,b,c,d,e,f,g,h);
         t = d; d = c; c = b; b = a; a = t;
         t = h; h = g; g = f; f = e; e = t;
     }
     FFSWAP(uint32_t, d, h);
 #else
 
     R128_0; R128_0; R128_0; R128_0;
     FFSWAP(uint32_t, a, e);
 
     R128_16; R128_16; R128_16; R128_16;
     FFSWAP(uint32_t, b, f);
 
     R128_32; R128_32; R128_32; R128_32;
     FFSWAP(uint32_t, c, g);
 
     R128_48; R128_48; R128_48; R128_48;
     FFSWAP(uint32_t, d, h);
 #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;
99b8cd0c
 }
 
 #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)
 
aa70801a
 #define R160_0                              \
     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)
 
 #define R160_16                             \
     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)
 
 #define R160_32                             \
     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)
 
 #define R160_48                             \
     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)
 
 #define R160_64                             \
     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)
 
 static void ripemd160_transform(uint32_t *state, const uint8_t buffer[64])
99b8cd0c
 {
aa70801a
     uint32_t a, b, c, d, e, f, g, h, i, j, av_unused t;
99b8cd0c
     uint32_t block[16];
     int n;
 
aa70801a
     a = f = state[0];
     b = g = state[1];
     c = h = state[2];
     d = i = state[3];
     e = j = state[4];
99b8cd0c
 
     for (n = 0; n < 16; n++)
         block[n] = AV_RL32(buffer + 4 * n);
452ac2aa
     n = 0;
99b8cd0c
 
8702a94e
 #if CONFIG_SMALL
     for (; n < 16;) {
         ROUND160_0_TO_15(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
     }
 
     for (; n < 32;) {
         ROUND160_16_TO_31(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
     }
 
     for (; n < 48;) {
         ROUND160_32_TO_47(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
     }
 
     for (; n < 64;) {
         ROUND160_48_TO_63(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
     }
 
     for (; n < 80;) {
         ROUND160_64_TO_79(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
     }
 #else
 
452ac2aa
     R160_0; R160_0; R160_0;
99b8cd0c
     ROUND160_0_TO_15(a,b,c,d,e,f,g,h,i,j);
452ac2aa
 
     R160_16; R160_16; R160_16;
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     ROUND160_16_TO_31(e,a,b,c,d,j,f,g,h,i);
452ac2aa
 
     R160_32; R160_32; R160_32;
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     ROUND160_32_TO_47(d,e,a,b,c,i,j,f,g,h);
452ac2aa
 
     R160_48; R160_48; R160_48;
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     ROUND160_48_TO_63(c,d,e,a,b,h,i,j,f,g);
452ac2aa
 
     R160_64; R160_64; R160_64;
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     ROUND160_64_TO_79(b,c,d,e,a,g,h,i,j,f);
8702a94e
 #endif
99b8cd0c
 
aa70801a
     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;
 }
 
 static void ripemd320_transform(uint32_t *state, const uint8_t buffer[64])
 {
     uint32_t a, b, c, d, e, f, g, h, i, j, av_unused t;
     uint32_t block[16];
     int n;
 
     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];
 
     for (n = 0; n < 16; n++)
         block[n] = AV_RL32(buffer + 4 * n);
     n = 0;
 
 #if CONFIG_SMALL
     for (; n < 16;) {
         ROUND160_0_TO_15(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
     }
     FFSWAP(uint32_t, b, g);
 
     for (; n < 32;) {
         ROUND160_16_TO_31(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
     }
     FFSWAP(uint32_t, d, i);
 
     for (; n < 48;) {
         ROUND160_32_TO_47(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
     }
     FFSWAP(uint32_t, a, f);
 
     for (; n < 64;) {
         ROUND160_48_TO_63(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
     }
     FFSWAP(uint32_t, c, h);
 
     for (; n < 80;) {
         ROUND160_64_TO_79(a,b,c,d,e,f,g,h,i,j);
         t = e; e = d; d = c; c = b; b = a; a = t;
         t = j; j = i; i = h; h = g; g = f; f = t;
99b8cd0c
     }
aa70801a
     FFSWAP(uint32_t, e, j);
 #else
 
     R160_0; R160_0; R160_0;
     ROUND160_0_TO_15(a,b,c,d,e,f,g,h,i,j);
     FFSWAP(uint32_t, a, f);
 
     R160_16; R160_16; R160_16;
     ROUND160_16_TO_31(e,a,b,c,d,j,f,g,h,i);
     FFSWAP(uint32_t, b, g);
 
     R160_32; R160_32; R160_32;
     ROUND160_32_TO_47(d,e,a,b,c,i,j,f,g,h);
     FFSWAP(uint32_t, c, h);
 
     R160_48; R160_48; R160_48;
     ROUND160_48_TO_63(c,d,e,a,b,h,i,j,f,g);
     FFSWAP(uint32_t, d, i);
 
     R160_64; R160_64; R160_64;
     ROUND160_64_TO_79(b,c,d,e,a,g,h,i,j,f);
     FFSWAP(uint32_t, e, j);
 #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; state[8] += i; state[9] += j;
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 }
 
 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;
         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;
         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;
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         ctx->transform = ripemd256_transform;
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         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;
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         ctx->transform = ripemd320_transform;
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         break;
     default:
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         return AVERROR(EINVAL);
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     }
     ctx->count = 0;
     return 0;
 }
 
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 #if FF_API_CRYPTO_SIZE_T
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 void av_ripemd_update(AVRIPEMD* ctx, const uint8_t* data, unsigned int len)
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 #else
 void av_ripemd_update(AVRIPEMD* ctx, const uint8_t* data, size_t len)
 #endif
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 {
     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) {
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             ctx->transform(ctx->state, ctx->buffer);
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             j = 0;
         }
     }
 #else
     if ((j + len) > 63) {
         memcpy(&ctx->buffer[j], data, (i = 64 - j));
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         ctx->transform(ctx->state, ctx->buffer);
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         for (; i + 63 < len; i += 64)
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             ctx->transform(ctx->state, &data[i]);
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         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]);
 }