1/*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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 "internal/cryptlib.h"
12#include <openssl/evp.h>
13#include <openssl/objects.h>
14#include <openssl/x509.h>
15#include "crypto/evp.h"
16
17int EVP_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
18 unsigned int *siglen, EVP_PKEY *pkey)
19{
20 unsigned char m[EVP_MAX_MD_SIZE];
21 unsigned int m_len = 0;
22 int i = 0;
23 size_t sltmp;
24 EVP_PKEY_CTX *pkctx = NULL;
25
26 *siglen = 0;
27 if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_FINALISE)) {
28 if (!EVP_DigestFinal_ex(ctx, m, &m_len))
29 goto err;
30 } else {
31 int rv = 0;
32 EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
33 if (tmp_ctx == NULL) {
34 EVPerr(EVP_F_EVP_SIGNFINAL, ERR_R_MALLOC_FAILURE);
35 return 0;
36 }
37 rv = EVP_MD_CTX_copy_ex(tmp_ctx, ctx);
38 if (rv)
39 rv = EVP_DigestFinal_ex(tmp_ctx, m, &m_len);
40 EVP_MD_CTX_free(tmp_ctx);
41 if (!rv)
42 return 0;
43 }
44
45 sltmp = (size_t)EVP_PKEY_size(pkey);
46 i = 0;
47 pkctx = EVP_PKEY_CTX_new(pkey, NULL);
48 if (pkctx == NULL)
49 goto err;
50 if (EVP_PKEY_sign_init(pkctx) <= 0)
51 goto err;
52 if (EVP_PKEY_CTX_set_signature_md(pkctx, EVP_MD_CTX_md(ctx)) <= 0)
53 goto err;
54 if (EVP_PKEY_sign(pkctx, sigret, &sltmp, m, m_len) <= 0)
55 goto err;
56 *siglen = sltmp;
57 i = 1;
58 err:
59 EVP_PKEY_CTX_free(pkctx);
60 return i;
61}
62