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/*
* Common API for cryptographic digests.
*
* Copyright (c) 2012 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/digest.h>
#include <string.h>
struct DigestContext {
const struct DigestInfo *impl;
CxMem *cx;
uint64_t state[1];
};
struct DigestContext *digest_new(const struct DigestInfo *impl, CxMem *cx)
{
struct DigestContext *ctx;
unsigned alloc;
alloc = offsetof(struct DigestContext, state) + impl->state_len;
ctx = cx_alloc(cx, alloc);
if (!ctx)
return NULL;
ctx->impl = impl;
ctx->cx = cx;
impl->init(ctx->state);
return ctx;
}
void digest_update(struct DigestContext *ctx, const void *data, size_t len)
{
ctx->impl->update(ctx->state, data, len);
}
void digest_final(struct DigestContext *ctx, uint8_t *res)
{
ctx->impl->final(ctx->state, res);
}
void digest_reset(struct DigestContext *ctx)
{
ctx->impl->init(ctx->state);
}
void digest_free(struct DigestContext *ctx)
{
CxMem *cx = ctx->cx;
unsigned alloc = offsetof(struct DigestContext, state) + ctx->impl->state_len;
memset(ctx, 0, alloc);
cx_free(cx, ctx);
}
unsigned digest_block_len(struct DigestContext *ctx)
{
return ctx->impl->block_len;
}
unsigned digest_result_len(struct DigestContext *ctx)
{
return ctx->impl->result_len;
}
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