551b1a36fc
the output block. git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@16774 ec53bebd-3082-4978-b11e-865c3cabbd6b
120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <hmac.h>
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void
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HMAC_CTX_init(HMAC_CTX *ctx)
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{
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memset(ctx, 0, sizeof(*ctx));
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}
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void
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HMAC_CTX_cleanup(HMAC_CTX *ctx)
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{
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if (ctx->buf) {
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memset(ctx->buf, 0, ctx->key_length);
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free(ctx->buf);
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ctx->buf = NULL;
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}
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if (ctx->opad) {
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memset(ctx->ipad, 0, ctx->key_length);
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free(ctx->opad);
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ctx->opad = NULL;
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}
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if (ctx->ipad) {
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memset(ctx->ipad, 0, ctx->key_length);
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free(ctx->ipad);
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ctx->ipad = NULL;
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}
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EVP_MD_CTX_cleanup(ctx->ctx);
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}
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size_t
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HMAC_size(const HMAC_CTX *ctx)
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{
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return EVP_MD_size(ctx->md);
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}
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void
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HMAC_Init_ex(HMAC_CTX *ctx,
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const void *key,
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size_t keylen,
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const EVP_MD *md,
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ENGINE *engine)
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{
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unsigned char *p;
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size_t i;
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if (ctx->md != md) {
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ctx->md = md;
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if (ctx->buf)
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free (ctx->buf);
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ctx->key_length = EVP_MD_size(ctx->md);
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ctx->buf = malloc(ctx->key_length);
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}
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#if 0
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ctx->engine = engine;
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#endif
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if (keylen > EVP_MD_block_size(ctx->md)) {
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EVP_Digest(key, keylen, ctx->buf, NULL, ctx->md, engine);
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key = ctx->buf;
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keylen = EVP_MD_size(ctx->md);
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}
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if (ctx->opad)
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free(ctx->opad);
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if (ctx->ipad)
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free(ctx->ipad);
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ctx->opad = malloc(EVP_MD_block_size(ctx->md));
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ctx->ipad = malloc(EVP_MD_block_size(ctx->md));
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memset(ctx->ipad, 0x36, EVP_MD_block_size(ctx->md));
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memset(ctx->opad, 0x5c, EVP_MD_block_size(ctx->md));
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for (i = 0, p = ctx->ipad; i < keylen; i++)
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p[i] ^= ((const unsigned char *)key)[i];
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for (i = 0, p = ctx->opad; i < keylen; i++)
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p[i] ^= ((const unsigned char *)key)[i];
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ctx->ctx = EVP_MD_CTX_create();
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EVP_DigestInit_ex(ctx->ctx, ctx->md, ctx->engine);
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EVP_DigestUpdate(ctx->ctx, ctx->ipad, EVP_MD_block_size(ctx->md));
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}
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void
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HMAC_Update(HMAC_CTX *ctx, const void *data, size_t len)
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{
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EVP_DigestUpdate(ctx->ctx, data, len);
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}
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void
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HMAC_Final(HMAC_CTX *ctx, void *md, unsigned int *len)
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{
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EVP_DigestFinal_ex(ctx->ctx, ctx->buf, NULL);
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EVP_DigestInit_ex(ctx->ctx, ctx->md, ctx->engine);
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EVP_DigestUpdate(ctx->ctx, ctx->opad, EVP_MD_block_size(ctx->md));
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EVP_DigestUpdate(ctx->ctx, ctx->buf, ctx->key_length);
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EVP_DigestFinal_ex(ctx->ctx, md, len);
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}
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void *
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HMAC(const EVP_MD *md,
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const void *key, size_t key_size,
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const void *data, size_t data_size,
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void *hash, unsigned int *hash_len)
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{
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HMAC_CTX ctx;
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HMAC_CTX_init(&ctx);
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HMAC_Init_ex(&ctx, key, key_size, md, NULL);
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HMAC_Update(&ctx, data, data_size);
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HMAC_Final(&ctx, hash, hash_len);
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HMAC_CTX_cleanup(&ctx);
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return hash;
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}
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