1 /* $OpenBSD: cm_pmeth.c,v 1.7 2014/07/10 13:58:22 jsing Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 2010. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2010 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 54 #include <stdio.h> 55 #include <string.h> 56 57 #include <openssl/cmac.h> 58 #include <openssl/evp.h> 59 #include <openssl/x509.h> 60 #include <openssl/x509v3.h> 61 62 #include "evp_locl.h" 63 64 /* The context structure and "key" is simply a CMAC_CTX */ 65 66 static int 67 pkey_cmac_init(EVP_PKEY_CTX *ctx) 68 { 69 ctx->data = CMAC_CTX_new(); 70 if (!ctx->data) 71 return 0; 72 ctx->keygen_info_count = 0; 73 return 1; 74 } 75 76 static int 77 pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) 78 { 79 if (!pkey_cmac_init(dst)) 80 return 0; 81 if (!CMAC_CTX_copy(dst->data, src->data)) 82 return 0; 83 return 1; 84 } 85 86 static void 87 pkey_cmac_cleanup(EVP_PKEY_CTX *ctx) 88 { 89 CMAC_CTX_free(ctx->data); 90 } 91 92 static int 93 pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) 94 { 95 CMAC_CTX *cmkey = CMAC_CTX_new(); 96 CMAC_CTX *cmctx = ctx->data; 97 98 if (!cmkey) 99 return 0; 100 if (!CMAC_CTX_copy(cmkey, cmctx)) { 101 CMAC_CTX_free(cmkey); 102 return 0; 103 } 104 EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey); 105 106 return 1; 107 } 108 109 static int 110 int_update(EVP_MD_CTX *ctx, const void *data, size_t count) 111 { 112 if (!CMAC_Update(ctx->pctx->data, data, count)) 113 return 0; 114 return 1; 115 } 116 117 static int 118 cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx) 119 { 120 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT); 121 mctx->update = int_update; 122 return 1; 123 } 124 125 static int 126 cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, 127 EVP_MD_CTX *mctx) 128 { 129 return CMAC_Final(ctx->data, sig, siglen); 130 } 131 132 static int 133 pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) 134 { 135 CMAC_CTX *cmctx = ctx->data; 136 137 switch (type) { 138 case EVP_PKEY_CTRL_SET_MAC_KEY: 139 if (!p2 || p1 < 0) 140 return 0; 141 if (!CMAC_Init(cmctx, p2, p1, NULL, NULL)) 142 return 0; 143 break; 144 145 case EVP_PKEY_CTRL_CIPHER: 146 if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine)) 147 return 0; 148 break; 149 150 case EVP_PKEY_CTRL_MD: 151 if (ctx->pkey && !CMAC_CTX_copy(ctx->data, 152 (CMAC_CTX *)ctx->pkey->pkey.ptr)) 153 return 0; 154 if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL)) 155 return 0; 156 break; 157 158 default: 159 return -2; 160 } 161 return 1; 162 } 163 164 static int 165 pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value) 166 { 167 if (!value) 168 return 0; 169 if (!strcmp(type, "key")) { 170 void *p = (void *)value; 171 return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, 172 strlen(p), p); 173 } 174 if (!strcmp(type, "cipher")) { 175 const EVP_CIPHER *c; 176 177 c = EVP_get_cipherbyname(value); 178 if (!c) 179 return 0; 180 return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c); 181 } 182 if (!strcmp(type, "hexkey")) { 183 unsigned char *key; 184 int r; 185 long keylen; 186 187 key = string_to_hex(value, &keylen); 188 if (!key) 189 return 0; 190 r = pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key); 191 free(key); 192 return r; 193 } 194 195 return -2; 196 } 197 198 const EVP_PKEY_METHOD cmac_pkey_meth = { 199 .pkey_id = EVP_PKEY_CMAC, 200 .flags = EVP_PKEY_FLAG_SIGCTX_CUSTOM, 201 202 .init = pkey_cmac_init, 203 .copy = pkey_cmac_copy, 204 .cleanup = pkey_cmac_cleanup, 205 206 .keygen = pkey_cmac_keygen, 207 208 .signctx_init = cmac_signctx_init, 209 .signctx = cmac_signctx, 210 211 .ctrl = pkey_cmac_ctrl, 212 .ctrl_str = pkey_cmac_ctrl_str 213 }; 214