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