xref: /openssl/crypto/evp/p_sign.c (revision da1c088f)
1 /*
2  * Copyright 1995-2023 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 
EVP_SignFinal_ex(EVP_MD_CTX * ctx,unsigned char * sigret,unsigned int * siglen,EVP_PKEY * pkey,OSSL_LIB_CTX * libctx,const char * propq)17 int EVP_SignFinal_ex(EVP_MD_CTX *ctx, unsigned char *sigret,
18                      unsigned int *siglen, EVP_PKEY *pkey, OSSL_LIB_CTX *libctx,
19                      const char *propq)
20 {
21     unsigned char m[EVP_MAX_MD_SIZE];
22     unsigned int m_len = 0;
23     int i = 0;
24     size_t sltmp;
25     EVP_PKEY_CTX *pkctx = NULL;
26 
27     *siglen = 0;
28     if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_FINALISE)) {
29         if (!EVP_DigestFinal_ex(ctx, m, &m_len))
30             goto err;
31     } else {
32         int rv = 0;
33         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
34 
35         if (tmp_ctx == NULL) {
36             ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
37             return 0;
38         }
39         rv = EVP_MD_CTX_copy_ex(tmp_ctx, ctx);
40         if (rv)
41             rv = EVP_DigestFinal_ex(tmp_ctx, m, &m_len);
42         else
43             rv = EVP_DigestFinal_ex(ctx, m, &m_len);
44         EVP_MD_CTX_free(tmp_ctx);
45         if (!rv)
46             return 0;
47     }
48 
49     sltmp = (size_t)EVP_PKEY_get_size(pkey);
50     i = 0;
51     pkctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq);
52     if (pkctx == NULL)
53         goto err;
54     if (EVP_PKEY_sign_init(pkctx) <= 0)
55         goto err;
56     if (EVP_PKEY_CTX_set_signature_md(pkctx, EVP_MD_CTX_get0_md(ctx)) <= 0)
57         goto err;
58     if (EVP_PKEY_sign(pkctx, sigret, &sltmp, m, m_len) <= 0)
59         goto err;
60     *siglen = sltmp;
61     i = 1;
62  err:
63     EVP_PKEY_CTX_free(pkctx);
64     return i;
65 }
66 
EVP_SignFinal(EVP_MD_CTX * ctx,unsigned char * sigret,unsigned int * siglen,EVP_PKEY * pkey)67 int EVP_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
68                   unsigned int *siglen, EVP_PKEY *pkey)
69 {
70     return EVP_SignFinal_ex(ctx, sigret, siglen, pkey, NULL, NULL);
71 }
72