/* * Copyright (C) 2013 Reimar Döffinger * * 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 #include #include "hash.h" #include "adler32.h" #include "crc.h" #include "md5.h" #include "murmur3.h" #include "ripemd.h" #include "sha.h" #include "sha512.h" #include "avstring.h" #include "base64.h" #include "error.h" #include "intreadwrite.h" #include "mem.h" enum hashtype { MD5, MURMUR3, RIPEMD128, RIPEMD160, RIPEMD256, RIPEMD320, SHA160, SHA224, SHA256, SHA512_224, SHA512_256, SHA384, SHA512, CRC32, ADLER32, NUM_HASHES }; typedef struct AVHashContext { void *ctx; enum hashtype type; const AVCRC *crctab; uint32_t crc; } AVHashContext; static const struct { const char *name; int size; } hashdesc[] = { [MD5] = {"MD5", 16}, [MURMUR3] = {"murmur3", 16}, [RIPEMD128] = {"RIPEMD128", 16}, [RIPEMD160] = {"RIPEMD160", 20}, [RIPEMD256] = {"RIPEMD256", 32}, [RIPEMD320] = {"RIPEMD320", 40}, [SHA160] = {"SHA160", 20}, [SHA224] = {"SHA224", 28}, [SHA256] = {"SHA256", 32}, [SHA512_224] = {"SHA512/224", 28}, [SHA512_256] = {"SHA512/256", 32}, [SHA384] = {"SHA384", 48}, [SHA512] = {"SHA512", 64}, [CRC32] = {"CRC32", 4}, [ADLER32] = {"adler32", 4}, }; const char *av_hash_names(int i) { if (i < 0 || i >= NUM_HASHES) return NULL; return hashdesc[i].name; } const char *av_hash_get_name(const AVHashContext *ctx) { return hashdesc[ctx->type].name; } int av_hash_get_size(const AVHashContext *ctx) { return hashdesc[ctx->type].size; } int av_hash_alloc(AVHashContext **ctx, const char *name) { AVHashContext *res; int i; *ctx = NULL; for (i = 0; i < NUM_HASHES; i++) if (av_strcasecmp(name, hashdesc[i].name) == 0) break; if (i >= NUM_HASHES) return AVERROR(EINVAL); res = av_mallocz(sizeof(*res)); if (!res) return AVERROR(ENOMEM); res->type = i; switch (i) { case MD5: res->ctx = av_md5_alloc(); break; case MURMUR3: res->ctx = av_murmur3_alloc(); break; case RIPEMD128: case RIPEMD160: case RIPEMD256: case RIPEMD320: res->ctx = av_ripemd_alloc(); break; case SHA160: case SHA224: case SHA256: res->ctx = av_sha_alloc(); break; case SHA512_224: case SHA512_256: case SHA384: case SHA512: res->ctx = av_sha512_alloc(); break; case CRC32: res->crctab = av_crc_get_table(AV_CRC_32_IEEE_LE); break; case ADLER32: break; } if (i != ADLER32 && i != CRC32 && !res->ctx) { av_free(res); return AVERROR(ENOMEM); } *ctx = res; return 0; } void av_hash_init(AVHashContext *ctx) { switch (ctx->type) { case MD5: av_md5_init(ctx->ctx); break; case MURMUR3: av_murmur3_init(ctx->ctx); break; case RIPEMD128: av_ripemd_init(ctx->ctx, 128); break; case RIPEMD160: av_ripemd_init(ctx->ctx, 160); break; case RIPEMD256: av_ripemd_init(ctx->ctx, 256); break; case RIPEMD320: av_ripemd_init(ctx->ctx, 320); break; case SHA160: av_sha_init(ctx->ctx, 160); break; case SHA224: av_sha_init(ctx->ctx, 224); break; case SHA256: av_sha_init(ctx->ctx, 256); break; case SHA512_224: av_sha512_init(ctx->ctx, 224); break; case SHA512_256: av_sha512_init(ctx->ctx, 256); break; case SHA384: av_sha512_init(ctx->ctx, 384); break; case SHA512: av_sha512_init(ctx->ctx, 512); break; case CRC32: ctx->crc = UINT32_MAX; break; case ADLER32: ctx->crc = 1; break; } } void av_hash_update(AVHashContext *ctx, const uint8_t *src, size_t len) { switch (ctx->type) { case MD5: av_md5_update(ctx->ctx, src, len); break; case MURMUR3: av_murmur3_update(ctx->ctx, src, len); break; case RIPEMD128: case RIPEMD160: case RIPEMD256: case RIPEMD320: av_ripemd_update(ctx->ctx, src, len); break; case SHA160: case SHA224: case SHA256: av_sha_update(ctx->ctx, src, len); break; case SHA512_224: case SHA512_256: case SHA384: case SHA512: av_sha512_update(ctx->ctx, src, len); break; case CRC32: ctx->crc = av_crc(ctx->crctab, ctx->crc, src, len); break; case ADLER32: ctx->crc = av_adler32_update(ctx->crc, src, len); break; } } void av_hash_final(AVHashContext *ctx, uint8_t *dst) { switch (ctx->type) { case MD5: av_md5_final(ctx->ctx, dst); break; case MURMUR3: av_murmur3_final(ctx->ctx, dst); break; case RIPEMD128: case RIPEMD160: case RIPEMD256: case RIPEMD320: av_ripemd_final(ctx->ctx, dst); break; case SHA160: case SHA224: case SHA256: av_sha_final(ctx->ctx, dst); break; case SHA512_224: case SHA512_256: case SHA384: case SHA512: av_sha512_final(ctx->ctx, dst); break; case CRC32: AV_WB32(dst, ctx->crc ^ UINT32_MAX); break; case ADLER32: AV_WB32(dst, ctx->crc); break; } } void av_hash_final_bin(struct AVHashContext *ctx, uint8_t *dst, int size) { uint8_t buf[AV_HASH_MAX_SIZE]; unsigned rsize = av_hash_get_size(ctx); av_hash_final(ctx, buf); memcpy(dst, buf, FFMIN(size, rsize)); if (size > rsize) memset(dst + rsize, 0, size - rsize); } void av_hash_final_hex(struct AVHashContext *ctx, uint8_t *dst, int size) { uint8_t buf[AV_HASH_MAX_SIZE]; unsigned rsize = av_hash_get_size(ctx), i; av_hash_final(ctx, buf); for (i = 0; i < FFMIN(rsize, size / 2); i++) snprintf(dst + i * 2, size - i * 2, "%02x", buf[i]); } void av_hash_final_b64(struct AVHashContext *ctx, uint8_t *dst, int size) { uint8_t buf[AV_HASH_MAX_SIZE], b64[AV_BASE64_SIZE(AV_HASH_MAX_SIZE)]; unsigned rsize = av_hash_get_size(ctx), osize; av_hash_final(ctx, buf); av_base64_encode(b64, sizeof(b64), buf, rsize); osize = AV_BASE64_SIZE(rsize); memcpy(dst, b64, FFMIN(osize, size)); if (size < osize) dst[size - 1] = 0; } void av_hash_freep(AVHashContext **ctx) { if (*ctx) av_freep(&(*ctx)->ctx); av_freep(ctx); }