2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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
12 #include <sys/types.h>
14 #include "internal/cryptlib.h"
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"
26 int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
27 ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
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;
37 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
40 for (i = 0; i < 2; i++) {
47 if (type->pkey_type == NID_dsaWithSHA1) {
49 * special case: RFC 2459 tells us to omit 'parameters' with
52 ASN1_TYPE_free(a->parameter);
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)
59 a->parameter->type = V_ASN1_NULL;
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);
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);
73 inl = i2d(data, NULL);
75 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_INTERNAL_ERROR);
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) {
84 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
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)) {
95 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
98 OPENSSL_free(signature->data);
99 signature->data = buf_out;
101 signature->length = outl;
103 * In the interests of compatibility, I'll make sure that the bit string
104 * has a 'not-used bits' value of 0
106 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
107 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
109 EVP_MD_CTX_free(ctx);
110 OPENSSL_clear_free((char *)buf_in, inll);
111 OPENSSL_clear_free((char *)buf_out, outll);
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)
122 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
125 ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE);
128 if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) {
129 EVP_MD_CTX_free(ctx);
133 rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx);
135 EVP_MD_CTX_free(ctx);
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)
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;
150 type = EVP_MD_CTX_md(ctx);
151 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
154 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
158 if (pkey->ameth == NULL) {
159 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
163 if (pkey->ameth->item_sign) {
164 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
166 outl = signature->length;
168 * Return value meanings:
170 * 1: method does everything.
171 * 2: carry on as normal.
172 * 3: ASN1 method sets algorithm identifiers: just sign.
175 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
184 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
187 if (!OBJ_find_sigid_by_algs(&signid,
189 pkey->ameth->pkey_id)) {
190 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
191 ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
195 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
196 paramtype = V_ASN1_NULL;
198 paramtype = V_ASN1_UNDEF;
201 X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
203 X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
207 buf_len = ASN1_item_i2d(asn, &buf_in, it);
210 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_INTERNAL_ERROR);
214 outll = outl = EVP_PKEY_size(pkey);
215 buf_out = OPENSSL_malloc(outll);
216 if (buf_in == NULL || buf_out == NULL) {
218 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
222 if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
224 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
227 OPENSSL_free(signature->data);
228 signature->data = buf_out;
230 signature->length = outl;
232 * In the interests of compatibility, I'll make sure that the bit string
233 * has a 'not-used bits' value of 0
235 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
236 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
238 OPENSSL_clear_free((char *)buf_in, inl);
239 OPENSSL_clear_free((char *)buf_out, outll);