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