1 | /* |
2 | * Copyright 1995-2017 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/bn.h> |
13 | #include <openssl/rsa.h> |
14 | #include <openssl/objects.h> |
15 | #include <openssl/x509.h> |
16 | |
17 | int 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 | |
54 | int 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 | |