1 /* 2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <stdio.h> 11 #include <time.h> 12 #include <sys/types.h> 13 14 #include "internal/cryptlib.h" 15 16 #include <openssl/bn.h> 17 #include <openssl/evp.h> 18 #include <openssl/x509.h> 19 #include <openssl/objects.h> 20 #include <openssl/buffer.h> 21 #include "crypto/asn1.h" 22 #include "crypto/evp.h" 23 24 #ifndef NO_ASN1_OLD 25 26 int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2, 27 ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey, 28 const EVP_MD *type) 29 { 30 EVP_MD_CTX *ctx = EVP_MD_CTX_new(); 31 unsigned char *p, *buf_in = NULL, *buf_out = NULL; 32 int i, inl = 0, outl = 0; 33 size_t inll = 0, outll = 0; 34 X509_ALGOR *a; 35 36 if (ctx == NULL) { 37 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE); 38 goto err; 39 } 40 for (i = 0; i < 2; i++) { 41 if (i == 0) 42 a = algor1; 43 else 44 a = algor2; 45 if (a == NULL) 46 continue; 47 if (type->pkey_type == NID_dsaWithSHA1) { 48 /* 49 * special case: RFC 2459 tells us to omit 'parameters' with 50 * id-dsa-with-sha1 51 */ 52 ASN1_TYPE_free(a->parameter); 53 a->parameter = NULL; 54 } else if ((a->parameter == NULL) || 55 (a->parameter->type != V_ASN1_NULL)) { 56 ASN1_TYPE_free(a->parameter); 57 if ((a->parameter = ASN1_TYPE_new()) == NULL) 58 goto err; 59 a->parameter->type = V_ASN1_NULL; 60 } 61 ASN1_OBJECT_free(a->algorithm); 62 a->algorithm = OBJ_nid2obj(type->pkey_type); 63 if (a->algorithm == NULL) { 64 ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE); 65 goto err; 66 } 67 if (a->algorithm->length == 0) { 68 ASN1err(ASN1_F_ASN1_SIGN, 69 ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); 70 goto err; 71 } 72 } 73 inl = i2d(data, NULL); 74 if (inl <= 0) { 75 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_INTERNAL_ERROR); 76 goto err; 77 } 78 inll = (size_t)inl; 79 buf_in = OPENSSL_malloc(inll); 80 outll = outl = EVP_PKEY_size(pkey); 81 buf_out = OPENSSL_malloc(outll); 82 if (buf_in == NULL || buf_out == NULL) { 83 outl = 0; 84 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE); 85 goto err; 86 } 87 p = buf_in; 88 89 i2d(data, &p); 90 if (!EVP_SignInit_ex(ctx, type, NULL) 91 || !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl) 92 || !EVP_SignFinal(ctx, (unsigned char *)buf_out, 93 (unsigned int *)&outl, pkey)) { 94 outl = 0; 95 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB); 96 goto err; 97 } 98 OPENSSL_free(signature->data); 99 signature->data = buf_out; 100 buf_out = NULL; 101 signature->length = outl; 102 /* 103 * In the interests of compatibility, I'll make sure that the bit string 104 * has a 'not-used bits' value of 0 105 */ 106 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); 107 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT; 108 err: 109 EVP_MD_CTX_free(ctx); 110 OPENSSL_clear_free((char *)buf_in, inll); 111 OPENSSL_clear_free((char *)buf_out, outll); 112 return outl; 113 } 114 115 #endif 116 117 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, 118 X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn, 119 EVP_PKEY *pkey, const EVP_MD *type) 120 { 121 int rv; 122 EVP_MD_CTX *ctx = EVP_MD_CTX_new(); 123 124 if (ctx == NULL) { 125 ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE); 126 return 0; 127 } 128 if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) { 129 EVP_MD_CTX_free(ctx); 130 return 0; 131 } 132 133 rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx); 134 135 EVP_MD_CTX_free(ctx); 136 return rv; 137 } 138 139 int ASN1_item_sign_ctx(const ASN1_ITEM *it, 140 X509_ALGOR *algor1, X509_ALGOR *algor2, 141 ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx) 142 { 143 const EVP_MD *type; 144 EVP_PKEY *pkey; 145 unsigned char *buf_in = NULL, *buf_out = NULL; 146 size_t inl = 0, outl = 0, outll = 0; 147 int signid, paramtype, buf_len = 0; 148 int rv; 149 150 type = EVP_MD_CTX_md(ctx); 151 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx)); 152 153 if (pkey == NULL) { 154 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED); 155 goto err; 156 } 157 158 if (pkey->ameth == NULL) { 159 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED); 160 goto err; 161 } 162 163 if (pkey->ameth->item_sign) { 164 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature); 165 if (rv == 1) 166 outl = signature->length; 167 /*- 168 * Return value meanings: 169 * <=0: error. 170 * 1: method does everything. 171 * 2: carry on as normal. 172 * 3: ASN1 method sets algorithm identifiers: just sign. 173 */ 174 if (rv <= 0) 175 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB); 176 if (rv <= 1) 177 goto err; 178 } else { 179 rv = 2; 180 } 181 182 if (rv == 2) { 183 if (type == NULL) { 184 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED); 185 goto err; 186 } 187 if (!OBJ_find_sigid_by_algs(&signid, 188 EVP_MD_nid(type), 189 pkey->ameth->pkey_id)) { 190 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, 191 ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED); 192 goto err; 193 } 194 195 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL) 196 paramtype = V_ASN1_NULL; 197 else 198 paramtype = V_ASN1_UNDEF; 199 200 if (algor1) 201 X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL); 202 if (algor2) 203 X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL); 204 205 } 206 207 buf_len = ASN1_item_i2d(asn, &buf_in, it); 208 if (buf_len <= 0) { 209 outl = 0; 210 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_INTERNAL_ERROR); 211 goto err; 212 } 213 inl = buf_len; 214 outll = outl = EVP_PKEY_size(pkey); 215 buf_out = OPENSSL_malloc(outll); 216 if (buf_in == NULL || buf_out == NULL) { 217 outl = 0; 218 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE); 219 goto err; 220 } 221 222 if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) { 223 outl = 0; 224 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB); 225 goto err; 226 } 227 OPENSSL_free(signature->data); 228 signature->data = buf_out; 229 buf_out = NULL; 230 signature->length = outl; 231 /* 232 * In the interests of compatibility, I'll make sure that the bit string 233 * has a 'not-used bits' value of 0 234 */ 235 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); 236 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT; 237 err: 238 OPENSSL_clear_free((char *)buf_in, inl); 239 OPENSSL_clear_free((char *)buf_out, outll); 240 return outl; 241 } 242