1/* 2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project 3 * 2007. 4 */ 5/* ==================================================================== 6 * Copyright (c) 2007 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59#include <stdio.h> 60#include "cryptlib.h" 61#include <openssl/evp.h> 62#include "asn1_locl.h" 63 64#define HMAC_TEST_PRIVATE_KEY_FORMAT 65 66/* 67 * HMAC "ASN1" method. This is just here to indicate the maximum HMAC output 68 * length and to free up an HMAC key. 69 */ 70 71static int hmac_size(const EVP_PKEY *pkey) 72{ 73 return EVP_MAX_MD_SIZE; 74} 75 76static void hmac_key_free(EVP_PKEY *pkey) 77{ 78 ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr; 79 if (os) { 80 if (os->data) 81 OPENSSL_cleanse(os->data, os->length); 82 ASN1_OCTET_STRING_free(os); 83 } 84} 85 86static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) 87{ 88 switch (op) { 89 case ASN1_PKEY_CTRL_DEFAULT_MD_NID: 90 *(int *)arg2 = NID_sha1; 91 return 1; 92 93 default: 94 return -2; 95 } 96} 97 98#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT 99/* 100 * A bogus private key format for test purposes. This is simply the HMAC key 101 * with "HMAC PRIVATE KEY" in the headers. When enabled the genpkey utility 102 * can be used to "generate" HMAC keys. 103 */ 104 105static int old_hmac_decode(EVP_PKEY *pkey, 106 const unsigned char **pder, int derlen) 107{ 108 ASN1_OCTET_STRING *os; 109 os = ASN1_OCTET_STRING_new(); 110 if (!os || !ASN1_OCTET_STRING_set(os, *pder, derlen)) 111 goto err; 112 if (!EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, os)) 113 goto err; 114 return 1; 115 116 err: 117 ASN1_OCTET_STRING_free(os); 118 return 0; 119} 120 121static int old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder) 122{ 123 int inc; 124 ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr; 125 if (pder) { 126 if (!*pder) { 127 *pder = OPENSSL_malloc(os->length); 128 inc = 0; 129 } else 130 inc = 1; 131 132 memcpy(*pder, os->data, os->length); 133 134 if (inc) 135 *pder += os->length; 136 } 137 138 return os->length; 139} 140 141#endif 142 143const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = { 144 EVP_PKEY_HMAC, 145 EVP_PKEY_HMAC, 146 0, 147 148 "HMAC", 149 "OpenSSL HMAC method", 150 151 0, 0, 0, 0, 152 153 0, 0, 0, 154 155 hmac_size, 156 0, 157 0, 0, 0, 0, 0, 0, 0, 158 159 hmac_key_free, 160 hmac_pkey_ctrl, 161#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT 162 old_hmac_decode, 163 old_hmac_encode 164#else 165 0, 0 166#endif 167}; 168