1/*
2 * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
3 *
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
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/bn.h>
13#include <openssl/rsa.h>
14#include <openssl/objects.h>
15#include <openssl/x509.h>
16
17int RSA_sign_ASN1_OCTET_STRING(int type,
18                               const unsigned char *m, unsigned int m_len,
19                               unsigned char *sigret, unsigned int *siglen,
20                               RSA *rsa)
21{
22    ASN1_OCTET_STRING sig;
23    int i, j, ret = 1;
24    unsigned char *p, *s;
25
26    sig.type = V_ASN1_OCTET_STRING;
27    sig.length = m_len;
28    sig.data = (unsigned char *)m;
29
30    i = i2d_ASN1_OCTET_STRING(&sig, NULL);
31    j = RSA_size(rsa);
32    if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
33        RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,
34               RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
35        return 0;
36    }
37    s = OPENSSL_malloc((unsigned int)j + 1);
38    if (s == NULL) {
39        RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
40        return 0;
41    }
42    p = s;
43    i2d_ASN1_OCTET_STRING(&sig, &p);
44    i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
45    if (i <= 0)
46        ret = 0;
47    else
48        *siglen = i;
49
50    OPENSSL_clear_free(s, (unsigned int)j + 1);
51    return ret;
52}
53
54int RSA_verify_ASN1_OCTET_STRING(int dtype,
55                                 const unsigned char *m,
56                                 unsigned int m_len, unsigned char *sigbuf,
57                                 unsigned int siglen, RSA *rsa)
58{
59    int i, ret = 0;
60    unsigned char *s;
61    const unsigned char *p;
62    ASN1_OCTET_STRING *sig = NULL;
63
64    if (siglen != (unsigned int)RSA_size(rsa)) {
65        RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,
66               RSA_R_WRONG_SIGNATURE_LENGTH);
67        return 0;
68    }
69
70    s = OPENSSL_malloc((unsigned int)siglen);
71    if (s == NULL) {
72        RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
73        goto err;
74    }
75    i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
76
77    if (i <= 0)
78        goto err;
79
80    p = s;
81    sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
82    if (sig == NULL)
83        goto err;
84
85    if (((unsigned int)sig->length != m_len) ||
86        (memcmp(m, sig->data, m_len) != 0)) {
87        RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, RSA_R_BAD_SIGNATURE);
88    } else {
89        ret = 1;
90    }
91 err:
92    ASN1_OCTET_STRING_free(sig);
93    OPENSSL_clear_free(s, (unsigned int)siglen);
94    return ret;
95}
96