lavu: Add RIPEMD hashing

Includes RIPEMD-128, RIPEMD-160, RIPEMD-256 and RIPEMD-320

Signed-off-by: James Almer <jamrial@gmail.com>

8 files changed, 554 insertions, 1 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 35e12a4..407a6c8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -68,6 +68,7 @@ Other:
   integer.c, integer.h                  Michael Niedermayer
   bswap.h
   opencl.c, opencl.h                    Wei Gao
+  ripemd.c, ripemd.h                    James Almer
 
 
 libavcodec
diff --git a/doc/APIchanges b/doc/APIchanges
index 1ab17c2..ffdb8a2 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -16,6 +16,13 @@ libavutil:     2012-10-22
 API changes, most recent first:
 
 
+2013-06-xx - xxxxxxx - lavu 52.36.100
+  Add AVRIPEMD:
+   av_ripemd_alloc()
+   av_ripemd_init()
+   av_ripemd_update()
+   av_ripemd_final()
+
 2013-06-05 - fc962d4 - lavu 52.13.0 - mem.h
   Add av_realloc_array and av_reallocp_array
 
diff --git a/libavutil/Makefile b/libavutil/Makefile
index f1ff9c6..21746f0 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -43,6 +43,7 @@ HEADERS = adler32.h                                                     \
           pixfmt.h                                                      \
           random_seed.h                                                 \
           rational.h                                                    \
+          ripemd.h                                                      \
           samplefmt.h                                                   \
           sha.h                                                         \
           sha512.h                                                      \
@@ -102,6 +103,7 @@ OBJS = adler32.o                                                        \
        random_seed.o                                                    \
        rational.o                                                       \
        rc4.o                                                            \
+       ripemd.o                                                         \
        samplefmt.o                                                      \
        sha.o                                                            \
        sha512.o                                                         \
@@ -148,6 +150,7 @@ TESTPROGS = adler32                                                     \
             parseutils                                                  \
             random_seed                                                 \
             rational                                                    \
+            ripemd                                                      \
             sha                                                         \
             sha512                                                      \
             tree                                                        \
diff --git a/libavutil/ripemd.c b/libavutil/ripemd.c
new file mode 100644
index 0000000..42aca8a
--- a/dev/null
+++ b/libavutil/ripemd.c
@@ -0,0 +1,435 @@
+/*
+ * 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 < 80 - 1;) {
+        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
diff --git a/libavutil/ripemd.h b/libavutil/ripemd.h
new file mode 100644
index 0000000..7b0c8bc
--- a/dev/null
+++ b/libavutil/ripemd.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (C) 2013 James Almer <jamrial@gmail.com>
+ *
+ * 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
+ */
+
+#ifndef AVUTIL_RIPEMD_H
+#define AVUTIL_RIPEMD_H
+
+#include <stdint.h>
+
+#include "attributes.h"
+#include "version.h"
+
+/**
+ * @defgroup lavu_ripemd RIPEMD
+ * @ingroup lavu_crypto
+ * @{
+ */
+
+extern const int av_ripemd_size;
+
+struct AVRIPEMD;
+
+/**
+ * Allocate an AVRIPEMD context.
+ */
+struct AVRIPEMD *av_ripemd_alloc(void);
+
+/**
+ * Initialize RIPEMD hashing.
+ *
+ * @param context pointer to the function context (of size av_ripemd_size)
+ * @param bits    number of bits in digest (128, 160, 256 or 320 bits)
+ * @return        zero if initialization succeeded, -1 otherwise
+ */
+int av_ripemd_init(struct AVRIPEMD* context, int bits);
+
+/**
+ * Update hash value.
+ *
+ * @param context hash function context
+ * @param data    input data to update hash with
+ * @param len     input data length
+ */
+void av_ripemd_update(struct AVRIPEMD* context, const uint8_t* data, unsigned int len);
+
+/**
+ * Finish hashing and output digest value.
+ *
+ * @param context hash function context
+ * @param digest  buffer where output digest value is stored
+ */
+void av_ripemd_final(struct AVRIPEMD* context, uint8_t *digest);
+
+/**
+ * @}
+ */
+
+#endif /* AVUTIL_RIPEMD_H */
diff --git a/libavutil/version.h b/libavutil/version.h
index ff98c69..6013fa1 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -75,7 +75,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  52
-#define LIBAVUTIL_VERSION_MINOR  36
+#define LIBAVUTIL_VERSION_MINOR  37
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
diff --git a/tests/fate/libavutil.mak b/tests/fate/libavutil.mak
index 1bc1968..f29123c 100644
--- a/tests/fate/libavutil.mak
+++ b/tests/fate/libavutil.mak
@@ -66,6 +66,10 @@ FATE_LIBAVUTIL += fate-random_seed
 fate-random_seed: libavutil/random_seed-test$(EXESUF)
 fate-random_seed: CMD = run libavutil/random_seed-test
 
+FATE_LIBAVUTIL += fate-ripemd
+fate-ripemd: libavutil/ripemd-test$(EXESUF)
+fate-ripemd: CMD = run libavutil/ripemd-test
+
 FATE_LIBAVUTIL += fate-sha
 fate-sha: libavutil/sha-test$(EXESUF)
 fate-sha: CMD = run libavutil/sha-test
diff --git a/tests/ref/fate/ripemd b/tests/ref/fate/ripemd
new file mode 100644
index 0000000..947412d
--- a/dev/null
+++ b/tests/ref/fate/ripemd
@@ -0,0 +1,28 @@
+Testing RIPEMD-128
+C14A12199C66E4BA84636B0F69144C77
+A1AA0689D0FAFA2DDC22E88B49133A06
+4A7F5723F954EBA1216C9D8F6320431F
+c14a1219 9c66e4ba 84636b0f 69144c77
+a1aa0689 d0fafa2d dc22e88b 49133a06
+4a7f5723 f954eba1 216c9d8f 6320431f
+Testing RIPEMD-160
+8EB208F7E05D987A9B044A8E98C6B087F15A0BFC
+12A053384A9C0C88E405A06C27DCF49ADA62EB2B
+52783243C1697BDBE16D37F97F68F08325DC1528
+8eb208f7 e05d987a 9b044a8e 98c6b087 f15a0bfc
+12a05338 4a9c0c88 e405a06c 27dcf49a da62eb2b
+52783243 c1697bdb e16d37f9 7f68f083 25dc1528
+Testing RIPEMD-256
+AFBD6E228B9D8CBBCEF5CA2D03E6DBA10AC0BC7DCBE4680E1E42D2E975459B65
+3843045583AAC6C8C8D9128573E7A9809AFB2A0F34CCC36EA9E72F16F6368E3F
+AC953744E10E31514C150D4D8D7B677342E33399788296E43AE4850CE4F97978
+afbd6e22 8b9d8cbb cef5ca2d 03e6dba1 0ac0bc7d cbe4680e 1e42d2e9 75459b65
+38430455 83aac6c8 c8d91285 73e7a980 9afb2a0f 34ccc36e a9e72f16 f6368e3f
+ac953744 e10e3151 4c150d4d 8d7b6773 42e33399 788296e4 3ae4850c e4f97978
+Testing RIPEMD-320
+DE4C01B3054F8930A79D09AE738E92301E5A17085BEFFDC1B8D116713E74F82FA942D64CDBC4682D
+D034A7950CF722021BA4B84DF769A5DE2060E259DF4C9BB4A4268C0E935BBC7470A969C9D072A1AC
+BDEE37F4371E20646B8B0D862DDA16292AE36F40965E8C8509E63D1DBDDECC503E2B63EB9245BB66
+de4c01b3 054f8930 a79d09ae 738e9230 1e5a1708 5beffdc1 b8d11671 3e74f82f a942d64c dbc4682d
+d034a795 0cf72202 1ba4b84d f769a5de 2060e259 df4c9bb4 a4268c0e 935bbc74 70a969c9 d072a1ac
+bdee37f4 371e2064 6b8b0d86 2dda1629 2ae36f40 965e8c85 09e63d1d bddecc50 3e2b63eb 9245bb66