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, outll = 0;
36 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
39 for (i = 0; i < 2; i++) {
46 if (type->pkey_type == NID_dsaWithSHA1) {
48 * special case: RFC 2459 tells us to omit 'parameters' with
51 ASN1_TYPE_free(a->parameter);
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)
58 a->parameter->type = V_ASN1_NULL;
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);
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);
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)) {
78 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
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)) {
89 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
92 OPENSSL_free(signature->data);
93 signature->data = buf_out;
95 signature->length = outl;
97 * In the interests of compatibility, I'll make sure that the bit string
98 * has a 'not-used bits' value of 0
100 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
101 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
103 EVP_MD_CTX_free(ctx);
104 OPENSSL_clear_free((char *)buf_in, (unsigned int)inl);
105 OPENSSL_clear_free((char *)buf_out, outll);
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)
116 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
119 ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE);
122 if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) {
123 EVP_MD_CTX_free(ctx);
127 rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx);
129 EVP_MD_CTX_free(ctx);
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)
139 unsigned char *buf_in = NULL, *buf_out = NULL;
140 size_t inl = 0, outl = 0, outll = 0;
141 int signid, paramtype;
144 type = EVP_MD_CTX_md(ctx);
145 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
148 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
152 if (pkey->ameth == NULL) {
153 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
157 if (pkey->ameth->item_sign) {
158 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
160 outl = signature->length;
162 * Return value meanings:
164 * 1: method does everything.
165 * 2: carry on as normal.
166 * 3: ASN1 method sets algorithm identifiers: just sign.
169 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
178 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
181 if (!OBJ_find_sigid_by_algs(&signid,
183 pkey->ameth->pkey_id)) {
184 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
185 ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
189 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
190 paramtype = V_ASN1_NULL;
192 paramtype = V_ASN1_UNDEF;
195 X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
197 X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
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)) {
206 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
210 if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
212 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
215 OPENSSL_free(signature->data);
216 signature->data = buf_out;
218 signature->length = outl;
220 * In the interests of compatibility, I'll make sure that the bit string
221 * has a 'not-used bits' value of 0
223 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
224 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
226 OPENSSL_clear_free((char *)buf_in, (unsigned int)inl);
227 OPENSSL_clear_free((char *)buf_out, outll);