1 /* $OpenBSD: hm_pmeth.c,v 1.11 2021/12/12 21:27:38 tb Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 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 <string.h> 61 62 #include <openssl/evp.h> 63 #include <openssl/hmac.h> 64 #include <openssl/x509.h> 65 #include <openssl/x509v3.h> 66 67 #include "evp_locl.h" 68 #include "hmac_local.h" 69 70 /* HMAC pkey context structure */ 71 72 typedef struct { 73 const EVP_MD *md; /* MD for HMAC use */ 74 ASN1_OCTET_STRING ktmp; /* Temp storage for key */ 75 HMAC_CTX ctx; 76 } HMAC_PKEY_CTX; 77 78 static int 79 pkey_hmac_init(EVP_PKEY_CTX *ctx) 80 { 81 HMAC_PKEY_CTX *hctx; 82 83 hctx = malloc(sizeof(HMAC_PKEY_CTX)); 84 if (!hctx) 85 return 0; 86 hctx->md = NULL; 87 hctx->ktmp.data = NULL; 88 hctx->ktmp.length = 0; 89 hctx->ktmp.flags = 0; 90 hctx->ktmp.type = V_ASN1_OCTET_STRING; 91 HMAC_CTX_init(&hctx->ctx); 92 93 ctx->data = hctx; 94 ctx->keygen_info_count = 0; 95 96 return 1; 97 } 98 99 static int 100 pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) 101 { 102 HMAC_PKEY_CTX *sctx, *dctx; 103 104 if (!pkey_hmac_init(dst)) 105 return 0; 106 sctx = src->data; 107 dctx = dst->data; 108 dctx->md = sctx->md; 109 HMAC_CTX_init(&dctx->ctx); 110 if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx)) 111 return 0; 112 if (sctx->ktmp.data) { 113 if (!ASN1_OCTET_STRING_set(&dctx->ktmp, sctx->ktmp.data, 114 sctx->ktmp.length)) 115 return 0; 116 } 117 return 1; 118 } 119 120 static void 121 pkey_hmac_cleanup(EVP_PKEY_CTX *ctx) 122 { 123 HMAC_PKEY_CTX *hctx = ctx->data; 124 125 HMAC_CTX_cleanup(&hctx->ctx); 126 freezero(hctx->ktmp.data, hctx->ktmp.length); 127 free(hctx); 128 } 129 130 static int 131 pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) 132 { 133 ASN1_OCTET_STRING *hkey = NULL; 134 HMAC_PKEY_CTX *hctx = ctx->data; 135 136 if (!hctx->ktmp.data) 137 return 0; 138 hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp); 139 if (!hkey) 140 return 0; 141 EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey); 142 143 return 1; 144 } 145 146 static int 147 int_update(EVP_MD_CTX *ctx, const void *data, size_t count) 148 { 149 HMAC_PKEY_CTX *hctx = ctx->pctx->data; 150 151 if (!HMAC_Update(&hctx->ctx, data, count)) 152 return 0; 153 return 1; 154 } 155 156 static int 157 hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx) 158 { 159 HMAC_PKEY_CTX *hctx = ctx->data; 160 161 HMAC_CTX_set_flags(&hctx->ctx, mctx->flags & ~EVP_MD_CTX_FLAG_NO_INIT); 162 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT); 163 mctx->update = int_update; 164 return 1; 165 } 166 167 static int 168 hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, 169 EVP_MD_CTX *mctx) 170 { 171 unsigned int hlen; 172 HMAC_PKEY_CTX *hctx = ctx->data; 173 int l = EVP_MD_CTX_size(mctx); 174 175 if (l < 0) 176 return 0; 177 *siglen = l; 178 if (!sig) 179 return 1; 180 181 if (!HMAC_Final(&hctx->ctx, sig, &hlen)) 182 return 0; 183 *siglen = (size_t)hlen; 184 return 1; 185 } 186 187 static int 188 pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) 189 { 190 HMAC_PKEY_CTX *hctx = ctx->data; 191 ASN1_OCTET_STRING *key; 192 193 switch (type) { 194 case EVP_PKEY_CTRL_SET_MAC_KEY: 195 if ((!p2 && p1 > 0) || (p1 < -1)) 196 return 0; 197 if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1)) 198 return 0; 199 break; 200 201 case EVP_PKEY_CTRL_MD: 202 hctx->md = p2; 203 break; 204 205 case EVP_PKEY_CTRL_DIGESTINIT: 206 key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr; 207 if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md, 208 ctx->engine)) 209 return 0; 210 break; 211 212 default: 213 return -2; 214 } 215 return 1; 216 } 217 218 static int 219 pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value) 220 { 221 if (!value) 222 return 0; 223 if (!strcmp(type, "key")) { 224 void *p = (void *)value; 225 return pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p); 226 } 227 if (!strcmp(type, "hexkey")) { 228 unsigned char *key; 229 int r; 230 long keylen; 231 key = string_to_hex(value, &keylen); 232 if (!key) 233 return 0; 234 r = pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key); 235 free(key); 236 return r; 237 } 238 return -2; 239 } 240 241 const EVP_PKEY_METHOD hmac_pkey_meth = { 242 .pkey_id = EVP_PKEY_HMAC, 243 244 .init = pkey_hmac_init, 245 .copy = pkey_hmac_copy, 246 .cleanup = pkey_hmac_cleanup, 247 248 .keygen = pkey_hmac_keygen, 249 250 .signctx_init = hmac_signctx_init, 251 .signctx = hmac_signctx, 252 253 .ctrl = pkey_hmac_ctrl, 254 .ctrl_str = pkey_hmac_ctrl_str 255 }; 256