/*
- * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
+/*
+ * HMAC low level APIs are deprecated for public use, but still ok for internal
+ * use.
+ */
+#include "internal/deprecated.h"
+
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "internal/cryptlib.h"
#include <openssl/hmac.h>
#include <openssl/opensslconf.h>
-#include "hmac_lcl.h"
+#include "hmac_local.h"
int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
const EVP_MD *md, ENGINE *impl)
{
- int rv = 0;
- int i, j, reset = 0;
+ int rv = 0, reset = 0;
+ int i, j;
unsigned char pad[HMAC_MAX_MD_CBLOCK_SIZE];
+ unsigned int keytmp_length;
+ unsigned char keytmp[HMAC_MAX_MD_CBLOCK_SIZE];
/* If we are changing MD then we must have a key */
if (md != NULL && md != ctx->md && (key == NULL || len < 0))
return 0;
if (md != NULL) {
- reset = 1;
ctx->md = md;
} else if (ctx->md) {
md = ctx->md;
return 0;
}
+ /*
+ * The HMAC construction is not allowed to be used with the
+ * extendable-output functions (XOF) shake128 and shake256.
+ */
+ if ((EVP_MD_flags(md) & EVP_MD_FLAG_XOF) != 0)
+ return 0;
+
if (key != NULL) {
reset = 1;
+
j = EVP_MD_block_size(md);
- if (!ossl_assert(j <= (int)sizeof(ctx->key)))
+ if (!ossl_assert(j <= (int)sizeof(keytmp)))
+ return 0;
+ if (j < 0)
return 0;
if (j < len) {
if (!EVP_DigestInit_ex(ctx->md_ctx, md, impl)
|| !EVP_DigestUpdate(ctx->md_ctx, key, len)
- || !EVP_DigestFinal_ex(ctx->md_ctx, ctx->key,
- &ctx->key_length))
+ || !EVP_DigestFinal_ex(ctx->md_ctx, keytmp,
+ &keytmp_length))
return 0;
} else {
- if (len < 0 || len > (int)sizeof(ctx->key))
+ if (len < 0 || len > (int)sizeof(keytmp))
return 0;
- memcpy(ctx->key, key, len);
- ctx->key_length = len;
+ memcpy(keytmp, key, len);
+ keytmp_length = len;
}
- if (ctx->key_length != HMAC_MAX_MD_CBLOCK_SIZE)
- memset(&ctx->key[ctx->key_length], 0,
- HMAC_MAX_MD_CBLOCK_SIZE - ctx->key_length);
- }
+ if (keytmp_length != HMAC_MAX_MD_CBLOCK_SIZE)
+ memset(&keytmp[keytmp_length], 0,
+ HMAC_MAX_MD_CBLOCK_SIZE - keytmp_length);
- if (reset) {
for (i = 0; i < HMAC_MAX_MD_CBLOCK_SIZE; i++)
- pad[i] = 0x36 ^ ctx->key[i];
+ pad[i] = 0x36 ^ keytmp[i];
if (!EVP_DigestInit_ex(ctx->i_ctx, md, impl)
|| !EVP_DigestUpdate(ctx->i_ctx, pad, EVP_MD_block_size(md)))
goto err;
for (i = 0; i < HMAC_MAX_MD_CBLOCK_SIZE; i++)
- pad[i] = 0x5c ^ ctx->key[i];
+ pad[i] = 0x5c ^ keytmp[i];
if (!EVP_DigestInit_ex(ctx->o_ctx, md, impl)
|| !EVP_DigestUpdate(ctx->o_ctx, pad, EVP_MD_block_size(md)))
goto err;
goto err;
rv = 1;
err:
- if (reset)
+ if (reset) {
+ OPENSSL_cleanse(keytmp, sizeof(keytmp));
OPENSSL_cleanse(pad, sizeof(pad));
+ }
return rv;
}
-#if OPENSSL_API_COMPAT < 0x10100000L
+#ifndef OPENSSL_NO_DEPRECATED_1_1_0
int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
{
if (key && md)
EVP_MD_CTX_reset(ctx->o_ctx);
EVP_MD_CTX_reset(ctx->md_ctx);
ctx->md = NULL;
- ctx->key_length = 0;
- OPENSSL_cleanse(ctx->key, sizeof(ctx->key));
}
void HMAC_CTX_free(HMAC_CTX *ctx)
goto err;
if (!EVP_MD_CTX_copy_ex(dctx->md_ctx, sctx->md_ctx))
goto err;
- memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK_SIZE);
- dctx->key_length = sctx->key_length;
dctx->md = sctx->md;
return 1;
err: