169 lines
4.7 KiB
C
Executable file
169 lines
4.7 KiB
C
Executable file
/* $OpenBSD: hm_ameth.c,v 1.10 2015/09/10 15:56:25 jsing Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2007.
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*/
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/* ====================================================================
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* Copyright (c) 2007 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <openssl/evp.h>
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#include "asn1_locl.h"
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#define HMAC_TEST_PRIVATE_KEY_FORMAT
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/* HMAC "ASN1" method. This is just here to indicate the
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* maximum HMAC output length and to free up an HMAC
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* key.
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*/
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static int
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hmac_size(const EVP_PKEY *pkey)
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{
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return EVP_MAX_MD_SIZE;
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}
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static void
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hmac_key_free(EVP_PKEY *pkey)
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{
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ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
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if (os) {
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if (os->data)
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explicit_bzero(os->data, os->length);
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ASN1_OCTET_STRING_free(os);
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}
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}
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static int
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hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
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{
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switch (op) {
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case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
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*(int *)arg2 = NID_sha1;
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return 1;
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default:
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return -2;
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}
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}
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#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
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/* A bogus private key format for test purposes. This is simply the
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* HMAC key with "HMAC PRIVATE KEY" in the headers. When enabled the
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* genpkey utility can be used to "generate" HMAC keys.
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*/
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static int
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old_hmac_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
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{
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ASN1_OCTET_STRING *os;
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os = ASN1_OCTET_STRING_new();
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if (os == NULL)
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goto err;
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if (ASN1_OCTET_STRING_set(os, *pder, derlen) == 0)
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goto err;
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if (EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, os) == 0)
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goto err;
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return 1;
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err:
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ASN1_OCTET_STRING_free(os);
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return 0;
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}
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static int
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old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder)
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{
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int inc;
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ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
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if (pder) {
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if (!*pder) {
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*pder = malloc(os->length);
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if (*pder == NULL)
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return -1;
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inc = 0;
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} else
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inc = 1;
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memcpy(*pder, os->data, os->length);
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if (inc)
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*pder += os->length;
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}
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return os->length;
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}
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#endif
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const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
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.pkey_id = EVP_PKEY_HMAC,
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.pkey_base_id = EVP_PKEY_HMAC,
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.pem_str = "HMAC",
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.info = "OpenSSL HMAC method",
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.pkey_size = hmac_size,
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.pkey_free = hmac_key_free,
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.pkey_ctrl = hmac_pkey_ctrl,
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#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
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.old_priv_decode = old_hmac_decode,
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.old_priv_encode = old_hmac_encode
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#endif
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};
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