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OpenSSL: Add support for crypto_hash_{init,update,finish}()

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This adds initial support for HMAC operations using the
crypto_hash_{init,update,finish}() wrappers.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-07-02 22:04:25 +03:00
parent 8f4636e41c
commit d9cc4646eb
1 changed files with 82 additions and 0 deletions
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82
src/crypto/crypto_openssl.c
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@ -14,6 +14,7 @@
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/dh.h>
#include <openssl/hmac.h>
#include "common.h"
#include "wpabuf.h"
@ -532,3 +533,84 @@ void dh5_free(void *ctx)
dh = ctx;
DH_free(dh);
}
struct crypto_hash {
HMAC_CTX ctx;
};
struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
size_t key_len)
{
struct crypto_hash *ctx;
const EVP_MD *md;
switch (alg) {
#ifndef OPENSSL_NO_MD5
case CRYPTO_HASH_ALG_HMAC_MD5:
md = EVP_md5();
break;
#endif /* OPENSSL_NO_MD5 */
#ifndef OPENSSL_NO_SHA
case CRYPTO_HASH_ALG_HMAC_SHA1:
md = EVP_sha1();
break;
#endif /* OPENSSL_NO_SHA */
#ifndef OPENSSL_NO_SHA256
#ifdef CONFIG_SHA256
case CRYPTO_HASH_ALG_HMAC_SHA256:
md = EVP_sha256();
break;
#endif /* CONFIG_SHA256 */
#endif /* OPENSSL_NO_SHA256 */
default:
return NULL;
}
ctx = os_zalloc(sizeof(*ctx));
if (ctx == NULL)
return NULL;
if (HMAC_Init_ex(&ctx->ctx, key, key_len, md, NULL) != 1) {
os_free(ctx);
return NULL;
}
return ctx;
}
void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
{
if (ctx == NULL)
return;
HMAC_Update(&ctx->ctx, data, len);
}
int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
{
unsigned int mdlen;
int res;
if (ctx == NULL)
return -2;
if (mac == NULL || len == NULL) {
os_free(ctx);
return 0;
}
mdlen = *len;
res = HMAC_Final(&ctx->ctx, mac, &mdlen);
HMAC_CTX_cleanup(&ctx->ctx);
os_free(ctx);
if (res == 1) {
*len = mdlen;
return 0;
}
return -1;
}