1 /*
2 * Copyright 1995-2020 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 /*
11 * RSA low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <stdio.h>
17 #include "internal/cryptlib.h"
18 #include <openssl/bn.h>
19 #include <openssl/rsa.h>
20 #include <openssl/objects.h>
21 #include <openssl/x509.h>
22
RSA_sign_ASN1_OCTET_STRING(int type,const unsigned char * m,unsigned int m_len,unsigned char * sigret,unsigned int * siglen,RSA * rsa)23 int RSA_sign_ASN1_OCTET_STRING(int type,
24 const unsigned char *m, unsigned int m_len,
25 unsigned char *sigret, unsigned int *siglen,
26 RSA *rsa)
27 {
28 ASN1_OCTET_STRING sig;
29 int i, j, ret = 1;
30 unsigned char *p, *s;
31
32 sig.type = V_ASN1_OCTET_STRING;
33 sig.length = m_len;
34 sig.data = (unsigned char *)m;
35
36 i = i2d_ASN1_OCTET_STRING(&sig, NULL);
37 j = RSA_size(rsa);
38 if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
39 ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
40 return 0;
41 }
42 s = OPENSSL_malloc((unsigned int)j + 1);
43 if (s == NULL)
44 return 0;
45 p = s;
46 i2d_ASN1_OCTET_STRING(&sig, &p);
47 i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
48 if (i <= 0)
49 ret = 0;
50 else
51 *siglen = i;
52
53 OPENSSL_clear_free(s, (unsigned int)j + 1);
54 return ret;
55 }
56
RSA_verify_ASN1_OCTET_STRING(int dtype,const unsigned char * m,unsigned int m_len,unsigned char * sigbuf,unsigned int siglen,RSA * rsa)57 int RSA_verify_ASN1_OCTET_STRING(int dtype,
58 const unsigned char *m,
59 unsigned int m_len, unsigned char *sigbuf,
60 unsigned int siglen, RSA *rsa)
61 {
62 int i, ret = 0;
63 unsigned char *s;
64 const unsigned char *p;
65 ASN1_OCTET_STRING *sig = NULL;
66
67 if (siglen != (unsigned int)RSA_size(rsa)) {
68 ERR_raise(ERR_LIB_RSA, RSA_R_WRONG_SIGNATURE_LENGTH);
69 return 0;
70 }
71
72 s = OPENSSL_malloc((unsigned int)siglen);
73 if (s == NULL)
74 goto err;
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 ERR_raise(ERR_LIB_RSA, 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
