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/*
* SHA3 implementation.
*
* Copyright (c) 2014 Marko Kreen
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <usual/crypto/sha3.h>
#include <usual/crypto/digest.h>
#define PAD_SHA3 0x06
#define PAD_SHAKE 0x1f
void sha3_224_reset(struct SHA3Context *ctx)
{
keccak_init(&ctx->kctx, SHA3_224_CAPACITY);
ctx->padded = 0;
ctx->obytes = SHA3_224_DIGEST_LENGTH;
ctx->pad = PAD_SHA3;
}
void sha3_256_reset(struct SHA3Context *ctx)
{
keccak_init(&ctx->kctx, SHA3_256_CAPACITY);
ctx->padded = 0;
ctx->obytes = SHA3_256_DIGEST_LENGTH;
ctx->pad = PAD_SHA3;
}
void sha3_384_reset(struct SHA3Context *ctx)
{
keccak_init(&ctx->kctx, SHA3_384_CAPACITY);
ctx->padded = 0;
ctx->obytes = SHA3_384_DIGEST_LENGTH;
ctx->pad = PAD_SHA3;
}
void sha3_512_reset(struct SHA3Context *ctx)
{
keccak_init(&ctx->kctx, SHA3_512_CAPACITY);
ctx->padded = 0;
ctx->obytes = SHA3_512_DIGEST_LENGTH;
ctx->pad = PAD_SHA3;
}
void shake128_reset(struct SHA3Context *ctx)
{
keccak_init(&ctx->kctx, SHAKE128_CAPACITY);
ctx->padded = 0;
ctx->obytes = SHAKE128_DIGEST_LENGTH;
ctx->pad = PAD_SHAKE;
}
void shake256_reset(struct SHA3Context *ctx)
{
keccak_init(&ctx->kctx, SHAKE256_CAPACITY);
ctx->padded = 0;
ctx->obytes = SHAKE256_DIGEST_LENGTH;
ctx->pad = PAD_SHAKE;
}
void sha3_update(struct SHA3Context *ctx, const void *ptr, unsigned len)
{
keccak_absorb(&ctx->kctx, ptr, len);
}
void sha3_final(struct SHA3Context *ctx, void *dst)
{
if (!ctx->padded) {
keccak_pad(&ctx->kctx, &ctx->pad, 1);
ctx->padded = 1;
}
keccak_squeeze(&ctx->kctx, dst, ctx->obytes);
}
void shake_update(struct SHA3Context *ctx, const void *ptr, unsigned len)
{
keccak_absorb(&ctx->kctx, ptr, len);
}
void shake_extract(struct SHA3Context *ctx, void *dst, unsigned count)
{
if (!ctx->padded) {
keccak_pad(&ctx->kctx, &ctx->pad, 1);
ctx->padded = 1;
}
keccak_squeeze(&ctx->kctx, dst, count);
}
/*
* DigestInfo
*/
static const struct DigestInfo sha3_224_info = {
(DigestInitFunc *)sha3_224_reset,
(DigestUpdateFunc *)sha3_update,
(DigestFinalFunc *)sha3_final,
sizeof(struct SHA3Context),
SHA3_224_DIGEST_LENGTH,
SHA3_224_BLOCK_SIZE
};
static const struct DigestInfo sha3_256_info = {
(DigestInitFunc *)sha3_256_reset,
(DigestUpdateFunc *)sha3_update,
(DigestFinalFunc *)sha3_final,
sizeof(struct SHA3Context),
SHA3_256_DIGEST_LENGTH,
SHA3_256_BLOCK_SIZE
};
static const struct DigestInfo sha3_384_info = {
(DigestInitFunc *)sha3_384_reset,
(DigestUpdateFunc *)sha3_update,
(DigestFinalFunc *)sha3_final,
sizeof(struct SHA3Context),
SHA3_384_DIGEST_LENGTH,
SHA3_384_BLOCK_SIZE
};
static const struct DigestInfo sha3_512_info = {
(DigestInitFunc *)sha3_512_reset,
(DigestUpdateFunc *)sha3_update,
(DigestFinalFunc *)sha3_final,
sizeof(struct SHA3Context),
SHA3_512_DIGEST_LENGTH,
SHA3_512_BLOCK_SIZE
};
static const struct DigestInfo shake128_info = {
(DigestInitFunc *)shake128_reset,
(DigestUpdateFunc *)sha3_update,
(DigestFinalFunc *)sha3_final,
sizeof(struct SHA3Context),
SHAKE128_DIGEST_LENGTH,
SHAKE128_BLOCK_SIZE
};
static const struct DigestInfo shake256_info = {
(DigestInitFunc *)shake256_reset,
(DigestUpdateFunc *)sha3_update,
(DigestFinalFunc *)sha3_final,
sizeof(struct SHA3Context),
SHAKE256_DIGEST_LENGTH,
SHAKE256_BLOCK_SIZE
};
const struct DigestInfo *digest_SHA3_224(void)
{
return &sha3_224_info;
}
const struct DigestInfo *digest_SHA3_256(void)
{
return &sha3_256_info;
}
const struct DigestInfo *digest_SHA3_384(void)
{
return &sha3_384_info;
}
const struct DigestInfo *digest_SHA3_512(void)
{
return &sha3_512_info;
}
const struct DigestInfo *digest_SHAKE128(void)
{
return &shake128_info;
}
const struct DigestInfo *digest_SHAKE256(void)
{
return &shake256_info;
}
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