/*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2018 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
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;
}
+ /*
+ * The HMAC construction is not allowed to be used with the
+ * extendable-output functions (XOF) shake128 and shake256.
+ */
+ if ((EVP_MD_meth_get_flags(md) & EVP_MD_FLAG_XOF) != 0)
+ return 0;
+
if (key != NULL) {
reset = 1;
j = EVP_MD_block_size(md);
- OPENSSL_assert(j <= (int)sizeof(ctx->key));
+ 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 {
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);
+ 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, 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, 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))
goto err;
- return 1;
+ rv = 1;
err:
- return 0;
+ if (reset)
+ OPENSSL_cleanse(pad, sizeof(pad));
+ return rv;
}
-#if OPENSSL_API_COMPAT < 0x10100000L
+#if !OPENSSL_API_1_1_0
int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
{
if (key && md)
}
}
-int HMAC_CTX_reset(HMAC_CTX *ctx)
+static int hmac_ctx_alloc_mds(HMAC_CTX *ctx)
{
- hmac_ctx_cleanup(ctx);
if (ctx->i_ctx == NULL)
ctx->i_ctx = EVP_MD_CTX_new();
if (ctx->i_ctx == NULL)
- goto err;
+ return 0;
if (ctx->o_ctx == NULL)
ctx->o_ctx = EVP_MD_CTX_new();
if (ctx->o_ctx == NULL)
- goto err;
+ return 0;
if (ctx->md_ctx == NULL)
ctx->md_ctx = EVP_MD_CTX_new();
if (ctx->md_ctx == NULL)
- goto err;
- ctx->md = NULL;
+ return 0;
return 1;
- err:
+}
+
+int HMAC_CTX_reset(HMAC_CTX *ctx)
+{
hmac_ctx_cleanup(ctx);
- return 0;
+ if (!hmac_ctx_alloc_mds(ctx)) {
+ hmac_ctx_cleanup(ctx);
+ return 0;
+ }
+ return 1;
}
int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
{
- if (!HMAC_CTX_reset(dctx))
+ if (!hmac_ctx_alloc_mds(dctx))
goto err;
if (!EVP_MD_CTX_copy_ex(dctx->i_ctx, sctx->i_ctx))
goto err;
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);
+ memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK_SIZE);
dctx->key_length = sctx->key_length;
dctx->md = sctx->md;
return 1;