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Make hmac work.

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@16509 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2006-01-10 05:47:45 +00:00
parent cf6b056888
commit bac186a757
1 changed files with 40 additions and 48 deletions
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88
lib/des/hmac.c
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@@ -4,31 +4,6 @@
#include <string.h>
#include <hmac.h>
HMAC_CTX *
HMAC_CTX_create(void)
{
return NULL;
}
void
HMAC_CTX_destroy(HMAC_CTX *ctx)
{
HMAC_CTX_cleanup(ctx);
if (ctx->buf) {
free(ctx->buf);
ctx->buf = NULL;
}
if (ctx->opad) {
free(ctx->opad);
ctx->opad = NULL;
}
if (ctx->ipad) {
free(ctx->ipad);
ctx->ipad = NULL;
}
free(ctx);
}
void
HMAC_CTX_init(HMAC_CTX *ctx)
{
@@ -38,6 +13,21 @@ HMAC_CTX_init(HMAC_CTX *ctx)
void
HMAC_CTX_cleanup(HMAC_CTX *ctx)
{
if (ctx->buf) {
memset(ctx->buf, 0, ctx->key_length);
free(ctx->buf);
ctx->buf = NULL;
}
if (ctx->opad) {
memset(ctx->ipad, 0, ctx->key_length);
free(ctx->opad);
ctx->opad = NULL;
}
if (ctx->ipad) {
memset(ctx->ipad, 0, ctx->key_length);
free(ctx->ipad);
ctx->ipad = NULL;
}
EVP_MD_CTX_cleanup(ctx->ctx);
}
@@ -50,7 +40,7 @@ HMAC_size(const HMAC_CTX *ctx)
void
HMAC_Init_ex(HMAC_CTX *ctx,
const void *key,
size_t len,
size_t keylen,
const EVP_MD *md,
ENGINE *engine)
{
@@ -61,14 +51,17 @@ HMAC_Init_ex(HMAC_CTX *ctx,
ctx->md = md;
if (ctx->buf)
free (ctx->buf);
ctx->buf = malloc(EVP_MD_size(ctx->md));
ctx->key_length = EVP_MD_size(ctx->md);
ctx->buf = malloc(ctx->key_length);
}
#if 0
ctx->engine = engine;
#endif
if (len < EVP_MD_size(ctx->md)) {
if (keylen > EVP_MD_size(ctx->md)) {
EVP_Digest(key, keylen, ctx->buf, NULL, ctx->md, engine);
key = ctx->buf;
EVP_Digest(key, len, ctx->buf, NULL, ctx->md, engine);
len = EVP_MD_size(ctx->md);
keylen = EVP_MD_size(ctx->md);
}
if (ctx->opad)
@@ -76,19 +69,20 @@ HMAC_Init_ex(HMAC_CTX *ctx,
if (ctx->ipad)
free(ctx->ipad);
ctx->opad = malloc(len);
ctx->ipad = malloc(len);
ctx->key_length = len;
ctx->opad = malloc(EVP_MD_block_size(ctx->md));
ctx->ipad = malloc(EVP_MD_block_size(ctx->md));
memset(ctx->ipad, 0x36, EVP_MD_block_size(ctx->md));
memset(ctx->opad, 0x5c, EVP_MD_block_size(ctx->md));
for (i = 0, p = ctx->opad; i < len; i++)
p[i] = ((const unsigned char *)key)[i] ^ 0x36;
for (i = 0, p = ctx->ipad; i < len; i++)
p[i] = ((const unsigned char *)key)[i] ^ 0x5c;
for (i = 0, p = ctx->ipad; i < keylen; i++)
p[i] ^= ((const unsigned char *)key)[i];
for (i = 0, p = ctx->opad; i < keylen; i++)
p[i] ^= ((const unsigned char *)key)[i];
ctx->ctx = EVP_MD_CTX_create();
EVP_DigestInit_ex(ctx->ctx, ctx->md, ctx->engine);
EVP_DigestUpdate(ctx->ctx, ctx->ipad, ctx->key_length);
EVP_DigestUpdate(ctx->ctx, ctx->ipad, EVP_MD_block_size(ctx->md));
}
void
@@ -103,8 +97,8 @@ HMAC_Final(HMAC_CTX *ctx, void *md, unsigned int *len)
EVP_DigestFinal_ex(ctx->ctx, ctx->buf, NULL);
EVP_DigestInit_ex(ctx->ctx, ctx->md, ctx->engine);
EVP_DigestUpdate(ctx->ctx, ctx->opad, ctx->key_length);
EVP_DigestUpdate(ctx->ctx, ctx->buf, EVP_MD_size(ctx->md));
EVP_DigestUpdate(ctx->ctx, ctx->opad, EVP_MD_block_size(ctx->md));
EVP_DigestUpdate(ctx->ctx, ctx->buf, ctx->key_length);
EVP_DigestFinal_ex(ctx->ctx, md, len);
}
@@ -114,14 +108,12 @@ HMAC(const EVP_MD *md,
const void *data, size_t data_size,
void *hash, unsigned int *hash_len)
{
HMAC_CTX *ctx;
HMAC_CTX ctx;
ctx = HMAC_CTX_create();
if (ctx == NULL)
return NULL;
HMAC_Init_ex(ctx, key, key_size, md, NULL);
HMAC_Update(ctx, data, data_size);
HMAC_Final(ctx, hash, hash_len);
HMAC_CTX_destroy(ctx);
HMAC_CTX_init(&ctx);
HMAC_Init_ex(&ctx, key, key_size, md, NULL);
HMAC_Update(&ctx, data, data_size);
HMAC_Final(&ctx, hash, hash_len);
HMAC_CTX_cleanup(&ctx);
return hash;
}