diff options
Diffstat (limited to 'libavutil')
-rw-r--r-- | libavutil/Makefile | 2 | ||||
-rw-r--r-- | libavutil/hmac.c | 138 | ||||
-rw-r--r-- | libavutil/hmac.h | 95 | ||||
-rw-r--r-- | libavutil/version.h | 2 |
4 files changed, 236 insertions, 1 deletions
diff --git a/libavutil/Makefile b/libavutil/Makefile index 61ddc9a3fc..a0044dade4 100644 --- a/libavutil/Makefile +++ b/libavutil/Makefile @@ -22,6 +22,7 @@ HEADERS = adler32.h \ eval.h \ fifo.h \ file.h \ + hmac.h \ imgutils.h \ intfloat.h \ intfloat_readwrite.h \ @@ -72,6 +73,7 @@ OBJS = adler32.o \ fifo.o \ file.o \ float_dsp.o \ + hmac.o \ imgutils.o \ intfloat_readwrite.o \ intmath.o \ diff --git a/libavutil/hmac.c b/libavutil/hmac.c new file mode 100644 index 0000000000..1520148246 --- /dev/null +++ b/libavutil/hmac.c @@ -0,0 +1,138 @@ +/* + * Copyright (C) 2012 Martin Storsjo + * + * 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 "hmac.h" +#include "md5.h" +#include "sha.h" +#include "mem.h" + +#define MAX_HASHLEN 20 +#define MAX_BLOCKLEN 64 + +struct AVHMAC { + void *hash; + int blocklen, hashlen; + void (*final)(void*, uint8_t*); + void (*update)(void*, const uint8_t*, int len); + void (*init)(void*); + uint8_t key[MAX_BLOCKLEN]; + int keylen; +}; + +static void sha1_init(void *ctx) +{ + av_sha_init(ctx, 160); +} + +AVHMAC *av_hmac_alloc(enum AVHMACType type) +{ + AVHMAC *c = av_mallocz(sizeof(*c)); + if (!c) + return NULL; + switch (type) { + case AV_HMAC_MD5: + c->blocklen = 64; + c->hashlen = 16; + c->init = av_md5_init; + c->update = av_md5_update; + c->final = av_md5_final; + c->hash = av_md5_alloc(); + break; + case AV_HMAC_SHA1: + c->blocklen = 64; + c->hashlen = 20; + c->init = sha1_init; + c->update = av_sha_update; + c->final = av_sha_final; + c->hash = av_sha_alloc(); + break; + default: + av_free(c); + return NULL; + } + if (!c->hash) { + av_free(c); + return NULL; + } + return c; +} + +void av_hmac_free(AVHMAC *c) +{ + if (!c) + return; + av_free(c->hash); + av_free(c); +} + +void av_hmac_init(AVHMAC *c, const uint8_t *key, unsigned int keylen) +{ + int i; + uint8_t block[MAX_BLOCKLEN]; + if (keylen > c->blocklen) { + c->init(c->hash); + c->update(c->hash, key, keylen); + c->final(c->hash, c->key); + c->keylen = c->hashlen; + } else { + memcpy(c->key, key, keylen); + c->keylen = keylen; + } + c->init(c->hash); + for (i = 0; i < c->keylen; i++) + block[i] = c->key[i] ^ 0x36; + for (i = c->keylen; i < c->blocklen; i++) + block[i] = 0x36; + c->update(c->hash, block, c->blocklen); +} + +void av_hmac_update(AVHMAC *c, const uint8_t *data, unsigned int len) +{ + c->update(c->hash, data, len); +} + +int av_hmac_final(AVHMAC *c, uint8_t *out, unsigned int outlen) +{ + uint8_t block[MAX_BLOCKLEN]; + int i; + if (outlen < c->hashlen) + return AVERROR(EINVAL); + c->final(c->hash, out); + c->init(c->hash); + for (i = 0; i < c->keylen; i++) + block[i] = c->key[i] ^ 0x5C; + for (i = c->keylen; i < c->blocklen; i++) + block[i] = 0x5C; + c->update(c->hash, block, c->blocklen); + c->update(c->hash, out, c->hashlen); + c->final(c->hash, out); + return c->hashlen; +} + +int av_hmac_calc(AVHMAC *c, const uint8_t *data, unsigned int len, + const uint8_t *key, unsigned int keylen, + uint8_t *out, unsigned int outlen) +{ + av_hmac_init(c, key, keylen); + av_hmac_update(c, data, len); + return av_hmac_final(c, out, outlen); +} diff --git a/libavutil/hmac.h b/libavutil/hmac.h new file mode 100644 index 0000000000..aef84c6439 --- /dev/null +++ b/libavutil/hmac.h @@ -0,0 +1,95 @@ +/* + * Copyright (C) 2012 Martin Storsjo + * + * 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_HMAC_H +#define AVUTIL_HMAC_H + +#include <stdint.h> + +/** + * @defgroup lavu_hmac HMAC + * @ingroup lavu_crypto + * @{ + */ + +enum AVHMACType { + AV_HMAC_MD5, + AV_HMAC_SHA1, +}; + +typedef struct AVHMAC AVHMAC; + +/** + * Allocate an AVHMAC context. + * @param type The hash function used for the HMAC. + */ +AVHMAC *av_hmac_alloc(enum AVHMACType type); + +/** + * Free an AVHMAC context. + * @param ctx The context to free, may be NULL + */ +void av_hmac_free(AVHMAC *ctx); + +/** + * Initialize an AVHMAC context with an authentication key. + * @param ctx The HMAC context + * @param key The authentication key + * @param keylen The length of the key, in bytes + */ +void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen); + +/** + * Hash data with the HMAC. + * @param ctx The HMAC context + * @param data The data to hash + * @param len The length of the data, in bytes + */ +void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len); + +/** + * Finish hashing and output the HMAC digest. + * @param ctx The HMAC context + * @param out The output buffer to write the digest into + * @param outlen The length of the out buffer, in bytes + * @return The number of bytes written to out, or a negative error code. + */ +int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen); + +/** + * Hash an array of data with a key. + * @param ctx The HMAC context + * @param data The data to hash + * @param len The length of the data, in bytes + * @param key The authentication key + * @param keylen The length of the key, in bytes + * @param out The output buffer to write the digest into + * @param outlen The length of the out buffer, in bytes + * @return The number of bytes written to out, or a negative error code. + */ +int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len, + const uint8_t *key, unsigned int keylen, + uint8_t *out, unsigned int outlen); + +/** + * @} + */ + +#endif /* AVUTIL_HMAC_H */ diff --git a/libavutil/version.h b/libavutil/version.h index f59fd9baea..c0c8fcad2e 100644 --- a/libavutil/version.h +++ b/libavutil/version.h @@ -75,7 +75,7 @@ */ #define LIBAVUTIL_VERSION_MAJOR 52 -#define LIBAVUTIL_VERSION_MINOR 14 +#define LIBAVUTIL_VERSION_MINOR 15 #define LIBAVUTIL_VERSION_MICRO 100 #define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \ |