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 "internal/asn1_int.h" 22 #include "internal/evp_int.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, outll = 0; 33 X509_ALGOR *a; 34 35 if (ctx == NULL) { 36 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE); 37 goto err; 38 } 39 for (i = 0; i < 2; i++) { 40 if (i == 0) 41 a = algor1; 42 else 43 a = algor2; 44 if (a == NULL) 45 continue; 46 if (type->pkey_type == NID_dsaWithSHA1) { 47 /* 48 * special case: RFC 2459 tells us to omit 'parameters' with 49 * id-dsa-with-sha1 50 */ 51 ASN1_TYPE_free(a->parameter); 52 a->parameter = NULL; 53 } else if ((a->parameter == NULL) || 54 (a->parameter->type != V_ASN1_NULL)) { 55 ASN1_TYPE_free(a->parameter); 56 if ((a->parameter = ASN1_TYPE_new()) == NULL) 57 goto err; 58 a->parameter->type = V_ASN1_NULL; 59 } 60 ASN1_OBJECT_free(a->algorithm); 61 a->algorithm = OBJ_nid2obj(type->pkey_type); 62 if (a->algorithm == NULL) { 63 ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE); 64 goto err; 65 } 66 if (a->algorithm->length == 0) { 67 ASN1err(ASN1_F_ASN1_SIGN, 68 ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); 69 goto err; 70 } 71 } 72 inl = i2d(data, NULL); 73 buf_in = OPENSSL_malloc((unsigned int)inl); 74 outll = outl = EVP_PKEY_size(pkey); 75 buf_out = OPENSSL_malloc((unsigned int)outl); 76 if ((buf_in == NULL) || (buf_out == NULL)) { 77 outl = 0; 78 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE); 79 goto err; 80 } 81 p = buf_in; 82 83 i2d(data, &p); 84 if (!EVP_SignInit_ex(ctx, type, NULL) 85 || !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl) 86 || !EVP_SignFinal(ctx, (unsigned char *)buf_out, 87 (unsigned int *)&outl, pkey)) { 88 outl = 0; 89 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB); 90 goto err; 91 } 92 OPENSSL_free(signature->data); 93 signature->data = buf_out; 94 buf_out = NULL; 95 signature->length = outl; 96 /* 97 * In the interests of compatibility, I'll make sure that the bit string 98 * has a 'not-used bits' value of 0 99 */ 100 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); 101 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT; 102 err: 103 EVP_MD_CTX_free(ctx); 104 OPENSSL_clear_free((char *)buf_in, (unsigned int)inl); 105 OPENSSL_clear_free((char *)buf_out, outll); 106 return outl; 107 } 108 109 #endif 110 111 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, 112 X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn, 113 EVP_PKEY *pkey, const EVP_MD *type) 114 { 115 int rv; 116 EVP_MD_CTX *ctx = EVP_MD_CTX_new(); 117 118 if (ctx == NULL) { 119 ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE); 120 return 0; 121 } 122 if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) { 123 EVP_MD_CTX_free(ctx); 124 return 0; 125 } 126 127 rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx); 128 129 EVP_MD_CTX_free(ctx); 130 return rv; 131 } 132 133 int ASN1_item_sign_ctx(const ASN1_ITEM *it, 134 X509_ALGOR *algor1, X509_ALGOR *algor2, 135 ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx) 136 { 137 const EVP_MD *type; 138 EVP_PKEY *pkey; 139 unsigned char *buf_in = NULL, *buf_out = NULL; 140 size_t inl = 0, outl = 0, outll = 0; 141 int signid, paramtype; 142 int rv; 143 144 type = EVP_MD_CTX_md(ctx); 145 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx)); 146 147 if (pkey == NULL) { 148 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED); 149 goto err; 150 } 151 152 if (pkey->ameth == NULL) { 153 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED); 154 goto err; 155 } 156 157 if (pkey->ameth->item_sign) { 158 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature); 159 if (rv == 1) 160 outl = signature->length; 161 /*- 162 * Return value meanings: 163 * <=0: error. 164 * 1: method does everything. 165 * 2: carry on as normal. 166 * 3: ASN1 method sets algorithm identifiers: just sign. 167 */ 168 if (rv <= 0) 169 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB); 170 if (rv <= 1) 171 goto err; 172 } else { 173 rv = 2; 174 } 175 176 if (rv == 2) { 177 if (type == NULL) { 178 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED); 179 goto err; 180 } 181 if (!OBJ_find_sigid_by_algs(&signid, 182 EVP_MD_nid(type), 183 pkey->ameth->pkey_id)) { 184 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, 185 ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED); 186 goto err; 187 } 188 189 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL) 190 paramtype = V_ASN1_NULL; 191 else 192 paramtype = V_ASN1_UNDEF; 193 194 if (algor1) 195 X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL); 196 if (algor2) 197 X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL); 198 199 } 200 201 inl = ASN1_item_i2d(asn, &buf_in, it); 202 outll = outl = EVP_PKEY_size(pkey); 203 buf_out = OPENSSL_malloc((unsigned int)outl); 204 if ((buf_in == NULL) || (buf_out == NULL)) { 205 outl = 0; 206 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE); 207 goto err; 208 } 209 210 if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) { 211 outl = 0; 212 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB); 213 goto err; 214 } 215 OPENSSL_free(signature->data); 216 signature->data = buf_out; 217 buf_out = NULL; 218 signature->length = outl; 219 /* 220 * In the interests of compatibility, I'll make sure that the bit string 221 * has a 'not-used bits' value of 0 222 */ 223 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); 224 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT; 225 err: 226 OPENSSL_clear_free((char *)buf_in, (unsigned int)inl); 227 OPENSSL_clear_free((char *)buf_out, outll); 228 return outl; 229 } 230