-/* crypto/hmac/hmac.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * Licensed under the OpenSSL license (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
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
#include <openssl/hmac.h>
+#include <openssl/opensslconf.h>
+#include "hmac_lcl.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;
- unsigned char pad[HMAC_MAX_MD_CBLOCK];
+ unsigned char pad[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) {
+ } else if (ctx->md) {
md = ctx->md;
} else {
return 0;
}
- if(!ctx->key_init && key == NULL)
- return 0;
-
if (key != NULL) {
reset = 1;
- j = M_EVP_MD_block_size(md);
- OPENSSL_assert(j <= (int)sizeof(ctx->key));
+ j = EVP_MD_block_size(md);
+ if (!ossl_assert(j <= (int)sizeof(ctx->key)))
+ return 0;
if (j < len) {
- if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl))
- goto err;
- if (!EVP_DigestUpdate(&ctx->md_ctx, key, len))
- goto err;
- if (!EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key,
- &ctx->key_length))
- goto err;
+ 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))
+ return 0;
} else {
- OPENSSL_assert(len >= 0 && len <= (int)sizeof(ctx->key));
+ if (len < 0 || len > (int)sizeof(ctx->key))
+ return 0;
memcpy(ctx->key, key, len);
ctx->key_length = len;
}
- if (ctx->key_length != HMAC_MAX_MD_CBLOCK)
+ if (ctx->key_length != HMAC_MAX_MD_CBLOCK_SIZE)
memset(&ctx->key[ctx->key_length], 0,
- HMAC_MAX_MD_CBLOCK - ctx->key_length);
- ctx->key_init = 1;
+ HMAC_MAX_MD_CBLOCK_SIZE - ctx->key_length);
}
if (reset) {
- for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
+ for (i = 0; i < HMAC_MAX_MD_CBLOCK_SIZE; i++)
pad[i] = 0x36 ^ ctx->key[i];
- if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl))
- goto err;
- if (!EVP_DigestUpdate(&ctx->i_ctx, pad, M_EVP_MD_block_size(md)))
+ 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; i++)
+ for (i = 0; i < HMAC_MAX_MD_CBLOCK_SIZE; i++)
pad[i] = 0x5c ^ ctx->key[i];
- if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl))
- goto err;
- if (!EVP_DigestUpdate(&ctx->o_ctx, pad, M_EVP_MD_block_size(md)))
+ if (!EVP_DigestInit_ex(ctx->o_ctx, md, impl)
+ || !EVP_DigestUpdate(ctx->o_ctx, pad, EVP_MD_block_size(md)))
goto err;
}
- if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx))
+ if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->i_ctx))
goto err;
- return 1;
+ rv = 1;
err:
- return 0;
+ if (reset)
+ OPENSSL_cleanse(pad, sizeof(pad));
+ return rv;
}
-#ifndef OPENSSL_NO_DEPRECATED
+#if OPENSSL_API_COMPAT < 0x10100000L
int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
{
if (key && md)
- HMAC_CTX_init(ctx);
+ HMAC_CTX_reset(ctx);
return HMAC_Init_ex(ctx, key, len, md, NULL);
}
#endif
int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
{
- if(!ctx->key_init)
+ if (!ctx->md)
return 0;
- return EVP_DigestUpdate(&ctx->md_ctx, data, len);
+ return EVP_DigestUpdate(ctx->md_ctx, data, len);
}
int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
unsigned int i;
unsigned char buf[EVP_MAX_MD_SIZE];
- if(!ctx->key_init)
+ if (!ctx->md)
goto err;
- if (!EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i))
+ if (!EVP_DigestFinal_ex(ctx->md_ctx, buf, &i))
goto err;
- if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx))
+ if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->o_ctx))
goto err;
- if (!EVP_DigestUpdate(&ctx->md_ctx, buf, i))
+ if (!EVP_DigestUpdate(ctx->md_ctx, buf, i))
goto err;
- if (!EVP_DigestFinal_ex(&ctx->md_ctx, md, len))
+ if (!EVP_DigestFinal_ex(ctx->md_ctx, md, len))
goto err;
return 1;
err:
return 0;
}
-void HMAC_CTX_init(HMAC_CTX *ctx)
+size_t HMAC_size(const HMAC_CTX *ctx)
{
- EVP_MD_CTX_init(&ctx->i_ctx);
- EVP_MD_CTX_init(&ctx->o_ctx);
- EVP_MD_CTX_init(&ctx->md_ctx);
- ctx->key_init = 0;
+ int size = EVP_MD_size((ctx)->md);
+
+ return (size < 0) ? 0 : size;
+}
+
+HMAC_CTX *HMAC_CTX_new(void)
+{
+ HMAC_CTX *ctx = OPENSSL_zalloc(sizeof(HMAC_CTX));
+
+ if (ctx != NULL) {
+ if (!HMAC_CTX_reset(ctx)) {
+ HMAC_CTX_free(ctx);
+ return NULL;
+ }
+ }
+ return ctx;
+}
+
+static void hmac_ctx_cleanup(HMAC_CTX *ctx)
+{
+ EVP_MD_CTX_reset(ctx->i_ctx);
+ 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)
+{
+ if (ctx != NULL) {
+ hmac_ctx_cleanup(ctx);
+ EVP_MD_CTX_free(ctx->i_ctx);
+ EVP_MD_CTX_free(ctx->o_ctx);
+ EVP_MD_CTX_free(ctx->md_ctx);
+ OPENSSL_free(ctx);
+ }
+}
+
+static int hmac_ctx_alloc_mds(HMAC_CTX *ctx)
+{
+ if (ctx->i_ctx == NULL)
+ ctx->i_ctx = EVP_MD_CTX_new();
+ if (ctx->i_ctx == NULL)
+ return 0;
+ if (ctx->o_ctx == NULL)
+ ctx->o_ctx = EVP_MD_CTX_new();
+ if (ctx->o_ctx == NULL)
+ return 0;
+ if (ctx->md_ctx == NULL)
+ ctx->md_ctx = EVP_MD_CTX_new();
+ if (ctx->md_ctx == NULL)
+ return 0;
+ return 1;
+}
+
+int HMAC_CTX_reset(HMAC_CTX *ctx)
+{
+ hmac_ctx_cleanup(ctx);
+ if (!hmac_ctx_alloc_mds(ctx)) {
+ hmac_ctx_cleanup(ctx);
+ return 0;
+ }
+ return 1;
}
int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
{
- HMAC_CTX_init(dctx);
- if (!EVP_MD_CTX_copy_ex(&dctx->i_ctx, &sctx->i_ctx))
+ if (!hmac_ctx_alloc_mds(dctx))
goto err;
- if (!EVP_MD_CTX_copy_ex(&dctx->o_ctx, &sctx->o_ctx))
+ if (!EVP_MD_CTX_copy_ex(dctx->i_ctx, sctx->i_ctx))
goto err;
- if (!EVP_MD_CTX_copy_ex(&dctx->md_ctx, &sctx->md_ctx))
+ if (!EVP_MD_CTX_copy_ex(dctx->o_ctx, sctx->o_ctx))
goto err;
- dctx->key_init = sctx->key_init;
- if(sctx->key_init) {
- memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
- dctx->key_length = sctx->key_length;
- }
+ 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:
+ hmac_ctx_cleanup(dctx);
return 0;
}
-void HMAC_CTX_cleanup(HMAC_CTX *ctx)
-{
- EVP_MD_CTX_cleanup(&ctx->i_ctx);
- EVP_MD_CTX_cleanup(&ctx->o_ctx);
- EVP_MD_CTX_cleanup(&ctx->md_ctx);
- memset(ctx, 0, sizeof *ctx);
-}
-
unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
const unsigned char *d, size_t n, unsigned char *md,
unsigned int *md_len)
{
- HMAC_CTX c;
+ HMAC_CTX *c = NULL;
static unsigned char m[EVP_MAX_MD_SIZE];
+ static const unsigned char dummy_key[1] = {'\0'};
if (md == NULL)
md = m;
- HMAC_CTX_init(&c);
- if (!HMAC_Init_ex(&c, key, key_len, evp_md, NULL))
+ if ((c = HMAC_CTX_new()) == NULL)
goto err;
- if (!HMAC_Update(&c, d, n))
+
+ /* For HMAC_Init_ex, NULL key signals reuse. */
+ if (key == NULL && key_len == 0) {
+ key = dummy_key;
+ }
+
+ if (!HMAC_Init_ex(c, key, key_len, evp_md, NULL))
+ goto err;
+ if (!HMAC_Update(c, d, n))
goto err;
- if (!HMAC_Final(&c, md, md_len))
+ if (!HMAC_Final(c, md, md_len))
goto err;
- HMAC_CTX_cleanup(&c);
+ HMAC_CTX_free(c);
return md;
err:
+ HMAC_CTX_free(c);
return NULL;
}
void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
{
- M_EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
- M_EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
- M_EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
+ EVP_MD_CTX_set_flags(ctx->i_ctx, flags);
+ EVP_MD_CTX_set_flags(ctx->o_ctx, flags);
+ EVP_MD_CTX_set_flags(ctx->md_ctx, flags);
+}
+
+const EVP_MD *HMAC_CTX_get_md(const HMAC_CTX *ctx)
+{
+ return ctx->md;
}
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