xref: /openssl/crypto/pem/pem_sign.c (revision e077455e)
1 /*
2  * Copyright 1995-2021 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 <openssl/pem.h>
16 
PEM_SignInit(EVP_MD_CTX * ctx,EVP_MD * type)17 int PEM_SignInit(EVP_MD_CTX *ctx, EVP_MD *type)
18 {
19     return EVP_DigestInit_ex(ctx, type, NULL);
20 }
21 
PEM_SignUpdate(EVP_MD_CTX * ctx,const unsigned char * data,unsigned int count)22 int PEM_SignUpdate(EVP_MD_CTX *ctx,
23                    const unsigned char *data, unsigned int count)
24 {
25     return EVP_DigestUpdate(ctx, data, count);
26 }
27 
PEM_SignFinal(EVP_MD_CTX * ctx,unsigned char * sigret,unsigned int * siglen,EVP_PKEY * pkey)28 int PEM_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
29                   unsigned int *siglen, EVP_PKEY *pkey)
30 {
31     unsigned char *m;
32     int i, ret = 0;
33     unsigned int m_len;
34 
35     m = OPENSSL_malloc(EVP_PKEY_get_size(pkey));
36     if (m == NULL)
37         goto err;
38 
39     if (EVP_SignFinal(ctx, m, &m_len, pkey) <= 0)
40         goto err;
41 
42     i = EVP_EncodeBlock(sigret, m, m_len);
43     *siglen = i;
44     ret = 1;
45  err:
46     /* ctx has been zeroed by EVP_SignFinal() */
47     OPENSSL_free(m);
48     return ret;
49 }
50