/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2007.
*/
/* ====================================================================
* Copyright (c) 2007 The OpenSSL Project. All rights reserved.
*
* 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 above 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 acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com). */
#include <openssl/evp.h>
#include <string.h>
#include <openssl/asn1.h>
#include <openssl/err.h>
#include <openssl/hmac.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include "internal.h"
#include "../digest/internal.h"
typedef struct {
const EVP_MD *md; /* MD for HMAC use */
ASN1_OCTET_STRING ktmp; /* Temp storage for key */
HMAC_CTX ctx;
} HMAC_PKEY_CTX;
static int pkey_hmac_init(EVP_PKEY_CTX *ctx) {
HMAC_PKEY_CTX *hctx;
hctx = OPENSSL_malloc(sizeof(HMAC_PKEY_CTX));
if (!hctx) {
return 0;
}
memset(hctx, 0, sizeof(HMAC_PKEY_CTX));
hctx->ktmp.type = V_ASN1_OCTET_STRING;
HMAC_CTX_init(&hctx->ctx);
ctx->data = hctx;
return 1;
}
static int pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) {
HMAC_PKEY_CTX *sctx, *dctx;
if (!pkey_hmac_init(dst)) {
return 0;
}
sctx = src->data;
dctx = dst->data;
dctx->md = sctx->md;
HMAC_CTX_init(&dctx->ctx);
if (!HMAC_CTX_copy_ex(&dctx->ctx, &sctx->ctx)) {
return 0;
}
if (sctx->ktmp.data) {
if (!ASN1_OCTET_STRING_set(&dctx->ktmp, sctx->ktmp.data,
sctx->ktmp.length)) {
return 0;
}
}
return 1;
}
static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx) {
HMAC_PKEY_CTX *hctx = ctx->data;
if (hctx == NULL) {
return;
}
HMAC_CTX_cleanup(&hctx->ctx);
if (hctx->ktmp.data) {
if (hctx->ktmp.length) {
OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length);
}
OPENSSL_free(hctx->ktmp.data);
hctx->ktmp.data = NULL;
}
OPENSSL_free(hctx);
}
static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
ASN1_OCTET_STRING *hkey = NULL;
HMAC_PKEY_CTX *hctx = ctx->data;
if (!hctx->ktmp.data) {
return 0;
}
hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
if (!hkey) {
return 0;
}
EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
return 1;
}
static void int_update(EVP_MD_CTX *ctx, const void *data, size_t count) {
HMAC_PKEY_CTX *hctx = ctx->pctx->data;
HMAC_Update(&hctx->ctx, data, count);
}
static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx) {
/* |mctx| gets repurposed as a hook to call |HMAC_Update|. Suppress the
* automatic setting of |mctx->update| and the rest of its initialization. */
EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
mctx->update = int_update;
return 1;
}
static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
EVP_MD_CTX *mctx) {
unsigned int hlen;
HMAC_PKEY_CTX *hctx = ctx->data;
size_t md_size = EVP_MD_CTX_size(mctx);
if (!sig) {
*siglen = md_size;
return 1;
} else if (*siglen < md_size) {
OPENSSL_PUT_ERROR(EVP, hmac_signctx, EVP_R_BUFFER_TOO_SMALL);
return 0;
}
if (!HMAC_Final(&hctx->ctx, sig, &hlen)) {
return 0;
}
*siglen = (size_t)hlen;
return 1;
}
static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) {
HMAC_PKEY_CTX *hctx = ctx->data;
ASN1_OCTET_STRING *key;
switch (type) {
case EVP_PKEY_CTRL_SET_MAC_KEY:
if ((!p2 && p1 > 0) || (p1 < -1)) {
return 0;
}
if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1)) {
return 0;
}
break;
case EVP_PKEY_CTRL_MD:
hctx->md = p2;
break;
case EVP_PKEY_CTRL_DIGESTINIT:
key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md,
ctx->engine)) {
return 0;
}
break;
default:
OPENSSL_PUT_ERROR(EVP, pkey_hmac_ctrl, EVP_R_COMMAND_NOT_SUPPORTED);
return 0;
}
return 1;
}
const EVP_PKEY_METHOD hmac_pkey_meth = {
EVP_PKEY_HMAC, 0 /* flags */, pkey_hmac_init,
pkey_hmac_copy, pkey_hmac_cleanup, 0 /* paramgen_init */,
0 /* paramgen */, 0 /* keygen_init */, pkey_hmac_keygen,
0 /* sign_init */, 0 /* sign */, 0 /* verify_init */,
0 /* verify */, hmac_signctx_init, hmac_signctx,
0 /* verifyctx_init */, 0 /* verifyctx */, 0 /* encrypt_init */,
0 /* encrypt */, 0 /* decrypt_init */, 0 /* decrypt */,
0 /* derive_init */, 0 /* derive */, pkey_hmac_ctrl,
0,
};