1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/*
* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
int RSA_sign_ASN1_OCTET_STRING(int type,
const unsigned char *m, unsigned int m_len,
unsigned char *sigret, unsigned int *siglen,
RSA *rsa)
{
ASN1_OCTET_STRING sig;
int i, j, ret = 1;
unsigned char *p, *s;
sig.type = V_ASN1_OCTET_STRING;
sig.length = m_len;
sig.data = (unsigned char *)m;
i = i2d_ASN1_OCTET_STRING(&sig, NULL);
j = RSA_size(rsa);
if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,
RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
return 0;
}
s = OPENSSL_malloc((unsigned int)j + 1);
if (s == NULL) {
RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
return 0;
}
p = s;
i2d_ASN1_OCTET_STRING(&sig, &p);
i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
if (i <= 0)
ret = 0;
else
*siglen = i;
OPENSSL_clear_free(s, (unsigned int)j + 1);
return ret;
}
int RSA_verify_ASN1_OCTET_STRING(int dtype,
const unsigned char *m,
unsigned int m_len, unsigned char *sigbuf,
unsigned int siglen, RSA *rsa)
{
int i, ret = 0;
unsigned char *s;
const unsigned char *p;
ASN1_OCTET_STRING *sig = NULL;
if (siglen != (unsigned int)RSA_size(rsa)) {
RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,
RSA_R_WRONG_SIGNATURE_LENGTH);
return 0;
}
s = OPENSSL_malloc((unsigned int)siglen);
if (s == NULL) {
RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
goto err;
}
i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
if (i <= 0)
goto err;
p = s;
sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
if (sig == NULL)
goto err;
if (((unsigned int)sig->length != m_len) ||
(memcmp(m, sig->data, m_len) != 0)) {
RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, RSA_R_BAD_SIGNATURE);
} else {
ret = 1;
}
err:
ASN1_OCTET_STRING_free(sig);
OPENSSL_clear_free(s, (unsigned int)siglen);
return ret;
}
|
