260 lines
7.6 KiB
C
260 lines
7.6 KiB
C
/*
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* Copyright (C) 2012 Martin Storsjo
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "attributes.h"
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#include "hmac.h"
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#include "md5.h"
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#include "sha.h"
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#include "sha512.h"
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#include "mem.h"
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#define MAX_HASHLEN 64
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#define MAX_BLOCKLEN 128
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struct AVHMAC {
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void *hash;
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int blocklen, hashlen;
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void (*final)(void*, uint8_t*);
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void (*update)(void*, const uint8_t*, int len);
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void (*init)(void*);
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uint8_t key[MAX_BLOCKLEN];
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int keylen;
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};
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#define DEFINE_SHA(bits) \
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static av_cold void sha ## bits ##_init(void *ctx) \
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{ \
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av_sha_init(ctx, bits); \
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}
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#define DEFINE_SHA512(bits) \
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static av_cold void sha ## bits ##_init(void *ctx) \
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{ \
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av_sha512_init(ctx, bits); \
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}
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DEFINE_SHA(160)
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DEFINE_SHA(224)
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DEFINE_SHA(256)
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DEFINE_SHA512(384)
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DEFINE_SHA512(512)
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AVHMAC *av_hmac_alloc(enum AVHMACType type)
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{
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AVHMAC *c = av_mallocz(sizeof(*c));
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if (!c)
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return NULL;
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switch (type) {
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case AV_HMAC_MD5:
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c->blocklen = 64;
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c->hashlen = 16;
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c->init = (void*)av_md5_init;
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c->update = (void*)av_md5_update;
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c->final = (void*)av_md5_final;
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c->hash = av_md5_alloc();
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break;
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case AV_HMAC_SHA1:
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c->blocklen = 64;
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c->hashlen = 20;
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c->init = sha160_init;
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c->update = (void*)av_sha_update;
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c->final = (void*)av_sha_final;
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c->hash = av_sha_alloc();
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break;
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case AV_HMAC_SHA224:
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c->blocklen = 64;
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c->hashlen = 28;
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c->init = sha224_init;
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c->update = (void*)av_sha_update;
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c->final = (void*)av_sha_final;
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c->hash = av_sha_alloc();
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break;
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case AV_HMAC_SHA256:
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c->blocklen = 64;
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c->hashlen = 32;
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c->init = sha256_init;
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c->update = (void*)av_sha_update;
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c->final = (void*)av_sha_final;
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c->hash = av_sha_alloc();
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break;
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case AV_HMAC_SHA384:
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c->blocklen = 128;
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c->hashlen = 48;
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c->init = sha384_init;
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c->update = (void*)av_sha512_update;
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c->final = (void*)av_sha512_final;
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c->hash = av_sha512_alloc();
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break;
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case AV_HMAC_SHA512:
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c->blocklen = 128;
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c->hashlen = 64;
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c->init = sha512_init;
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c->update = (void*)av_sha512_update;
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c->final = (void*)av_sha512_final;
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c->hash = av_sha512_alloc();
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break;
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default:
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av_free(c);
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return NULL;
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}
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if (!c->hash) {
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av_free(c);
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return NULL;
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}
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return c;
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}
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void av_hmac_free(AVHMAC *c)
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{
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if (!c)
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return;
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av_free(c->hash);
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av_free(c);
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}
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void av_hmac_init(AVHMAC *c, const uint8_t *key, unsigned int keylen)
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{
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int i;
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uint8_t block[MAX_BLOCKLEN];
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if (keylen > c->blocklen) {
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c->init(c->hash);
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c->update(c->hash, key, keylen);
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c->final(c->hash, c->key);
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c->keylen = c->hashlen;
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} else {
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memcpy(c->key, key, keylen);
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c->keylen = keylen;
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}
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c->init(c->hash);
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for (i = 0; i < c->keylen; i++)
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block[i] = c->key[i] ^ 0x36;
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for (i = c->keylen; i < c->blocklen; i++)
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block[i] = 0x36;
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c->update(c->hash, block, c->blocklen);
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}
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void av_hmac_update(AVHMAC *c, const uint8_t *data, unsigned int len)
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{
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c->update(c->hash, data, len);
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}
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int av_hmac_final(AVHMAC *c, uint8_t *out, unsigned int outlen)
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{
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uint8_t block[MAX_BLOCKLEN];
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int i;
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if (outlen < c->hashlen)
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return AVERROR(EINVAL);
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c->final(c->hash, out);
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c->init(c->hash);
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for (i = 0; i < c->keylen; i++)
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block[i] = c->key[i] ^ 0x5C;
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for (i = c->keylen; i < c->blocklen; i++)
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block[i] = 0x5C;
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c->update(c->hash, block, c->blocklen);
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c->update(c->hash, out, c->hashlen);
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c->final(c->hash, out);
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return c->hashlen;
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}
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int av_hmac_calc(AVHMAC *c, const uint8_t *data, unsigned int len,
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const uint8_t *key, unsigned int keylen,
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uint8_t *out, unsigned int outlen)
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{
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av_hmac_init(c, key, keylen);
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av_hmac_update(c, data, len);
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return av_hmac_final(c, out, outlen);
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}
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#ifdef TEST
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#include <stdio.h>
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static void test(AVHMAC *hmac, const uint8_t *key, int keylen,
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const uint8_t *data, int datalen)
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{
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uint8_t buf[MAX_HASHLEN];
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int out, i;
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// Some of the test vectors are strings, where sizeof() includes the
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// trailing null byte - remove that.
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if (!key[keylen - 1])
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keylen--;
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if (!data[datalen - 1])
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datalen--;
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out = av_hmac_calc(hmac, data, datalen, key, keylen, buf, sizeof(buf));
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for (i = 0; i < out; i++)
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printf("%02x", buf[i]);
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printf("\n");
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}
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int main(void)
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{
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uint8_t key1[20], key3[131], data3[50];
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enum AVHMACType i = AV_HMAC_SHA224;
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static const uint8_t key2[] = "Jefe";
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static const uint8_t data1[] = "Hi There";
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static const uint8_t data2[] = "what do ya want for nothing?";
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static const uint8_t data4[] = "Test Using Larger Than Block-Size Key - Hash Key First";
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static const uint8_t data5[] = "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data";
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static const uint8_t data6[] = "This is a test using a larger than block-size key and a larger "
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"than block-size data. The key needs to be hashed before being used"
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" by the HMAC algorithm.";
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AVHMAC *hmac = av_hmac_alloc(AV_HMAC_MD5);
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if (!hmac)
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return 1;
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memset(key1, 0x0b, sizeof(key1));
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memset(key3, 0xaa, sizeof(key3));
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memset(data3, 0xdd, sizeof(data3));
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// RFC 2202 test vectors
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test(hmac, key1, 16, data1, sizeof(data1));
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test(hmac, key2, sizeof(key2), data2, sizeof(data2));
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test(hmac, key3, 16, data3, sizeof(data3));
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test(hmac, key3, 80, data4, sizeof(data4));
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test(hmac, key3, 80, data5, sizeof(data5));
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av_hmac_free(hmac);
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/* SHA-1 */
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hmac = av_hmac_alloc(AV_HMAC_SHA1);
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if (!hmac)
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return 1;
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// RFC 2202 test vectors
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test(hmac, key1, sizeof(key1), data1, sizeof(data1));
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test(hmac, key2, sizeof(key2), data2, sizeof(data2));
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test(hmac, key3, 20, data3, sizeof(data3));
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test(hmac, key3, 80, data4, sizeof(data4));
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test(hmac, key3, 80, data5, sizeof(data5));
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av_hmac_free(hmac);
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/* SHA-2 */
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while (i <= AV_HMAC_SHA512) {
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hmac = av_hmac_alloc(i);
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// RFC 4231 test vectors
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test(hmac, key1, sizeof(key1), data1, sizeof(data1));
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test(hmac, key2, sizeof(key2), data2, sizeof(data2));
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test(hmac, key3, 20, data3, sizeof(data3));
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test(hmac, key3, sizeof(key3), data4, sizeof(data4));
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test(hmac, key3, sizeof(key3), data6, sizeof(data6));
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av_hmac_free(hmac);
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i++;
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}
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return 0;
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}
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#endif /* TEST */
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