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rsa_sign.c

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1/* $OpenBSD: rsa_sign.c,v 1.31 2018/09/05 00:55:33 djm Exp $ */-
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)-
3 * All rights reserved.-
4 *-
5 * This package is an SSL implementation written-
6 * by Eric Young (eay@cryptsoft.com).-
7 * The implementation was written so as to conform with Netscapes SSL.-
8 *-
9 * This library is free for commercial and non-commercial use as long as-
10 * the following conditions are aheared to. The following conditions-
11 * apply to all code found in this distribution, be it the RC4, RSA,-
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation-
13 * included with this distribution is covered by the same copyright terms-
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).-
15 *-
16 * Copyright remains Eric Young's, and as such any Copyright notices in-
17 * the code are not to be removed.-
18 * If this package is used in a product, Eric Young should be given attribution-
19 * as the author of the parts of the library used.-
20 * This can be in the form of a textual message at program startup or-
21 * in documentation (online or textual) provided with the package.-
22 *-
23 * Redistribution and use in source and binary forms, with or without-
24 * modification, are permitted provided that the following conditions-
25 * are met:-
26 * 1. Redistributions of source code must retain the copyright-
27 * notice, this list of conditions and the following disclaimer.-
28 * 2. Redistributions in binary form must reproduce the above copyright-
29 * notice, this list of conditions and the following disclaimer in the-
30 * documentation and/or other materials provided with the distribution.-
31 * 3. All advertising materials mentioning features or use of this software-
32 * must display the following acknowledgement:-
33 * "This product includes cryptographic software written by-
34 * Eric Young (eay@cryptsoft.com)"-
35 * The word 'cryptographic' can be left out if the rouines from the library-
36 * being used are not cryptographic related :-).-
37 * 4. If you include any Windows specific code (or a derivative thereof) from-
38 * the apps directory (application code) you must include an acknowledgement:-
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"-
40 *-
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND-
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE-
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE-
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE-
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL-
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS-
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)-
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT-
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY-
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF-
51 * SUCH DAMAGE.-
52 *-
53 * The licence and distribution terms for any publically available version or-
54 * derivative of this code cannot be changed. i.e. this code cannot simply be-
55 * copied and put under another distribution licence-
56 * [including the GNU Public Licence.]-
57 */-
58-
59#include <stdio.h>-
60#include <string.h>-
61-
62#include <openssl/bn.h>-
63#include <openssl/err.h>-
64#include <openssl/objects.h>-
65#include <openssl/rsa.h>-
66#include <openssl/x509.h>-
67-
68#include "rsa_locl.h"-
69-
70/* Size of an SSL signature: MD5+SHA1 */-
71#define SSL_SIG_LENGTH 36-
72-
73static int encode_pkcs1(unsigned char **, int *, int , const unsigned char *,-
74 unsigned int);-
75-
76/*-
77 * encode_pkcs1 encodes a DigestInfo prefix of hash `type' and digest `m', as-
78 * described in EMSA-PKCS-v1_5-ENCODE, RFC 8017 section 9. step 2. This-
79 * encodes the DigestInfo (T and tLen) but does not add the padding.-
80 *-
81 * On success, it returns one and sets `*out' to a newly allocated buffer-
82 * containing the result and `*out_len' to its length. Freeing `*out' is-
83 * the caller's responsibility. Failure is indicated by zero.-
84 */-
85static int-
86encode_pkcs1(unsigned char **out, int *out_len, int type,-
87 const unsigned char *m, unsigned int m_len)-
88{-
89 X509_SIG sig;-
90 X509_ALGOR algor;-
91 ASN1_TYPE parameter;-
92 ASN1_OCTET_STRING digest;-
93 uint8_t *der = NULL;-
94 int len;-
95-
96 sig.algor = &algor;-
97 if ((sig.algor->algorithm = OBJ_nid2obj(type)) == NULL) {
(sig.algor->al...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 142 times by 5 tests
Evaluated by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
0-142
98 RSAerror(RSA_R_UNKNOWN_ALGORITHM_TYPE);-
99 return 0;
never executed: return 0;
0
100 }-
101 if (sig.algor->algorithm->length == 0) {
sig.algor->alg...m->length == 0Description
TRUEnever evaluated
FALSEevaluated 142 times by 5 tests
Evaluated by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
0-142
102 RSAerror(-
103 RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);-
104 return 0;
never executed: return 0;
0
105 }-
106 parameter.type = V_ASN1_NULL;-
107 parameter.value.ptr = NULL;-
108 sig.algor->parameter = &parameter;-
109-
110 sig.digest = &digest;-
111 sig.digest->data = (unsigned char*)m; /* TMP UGLY CAST */-
112 sig.digest->length = m_len;-
113-
114 if ((len = i2d_X509_SIG(&sig, &der)) < 0)
(len = i2d_X50...ig, &der)) < 0Description
TRUEnever evaluated
FALSEevaluated 142 times by 5 tests
Evaluated by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
0-142
115 return 0;
never executed: return 0;
0
116-
117 *out = der;-
118 *out_len = len;-
119-
120 return 1;
executed 142 times by 5 tests: return 1;
Executed by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
142
121}-
122-
123int-
124RSA_sign(int type, const unsigned char *m, unsigned int m_len,-
125 unsigned char *sigret, unsigned int *siglen, RSA *rsa)-
126{-
127 const unsigned char *encoded = NULL;-
128 unsigned char *tmps = NULL;-
129 int encrypt_len, encoded_len = 0, ret = 0;-
130-
131 if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign != NULL)
(rsa->flags & 0x0040)Description
TRUEnever evaluated
FALSEevaluated 51 times by 5 tests
Evaluated by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
rsa->meth->rsa...!= ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0-51
132 return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa);
never executed: return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa);
0
133-
134 /* Compute the encoded digest. */-
135 if (type == NID_md5_sha1) {
type == 114Description
TRUEevaluated 15 times by 2 tests
Evaluated by:
  • servertest
  • ssltest
FALSEevaluated 36 times by 5 tests
Evaluated by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
15-36
136 /*-
137 * NID_md5_sha1 corresponds to the MD5/SHA1 combination in-
138 * TLS 1.1 and earlier. It has no DigestInfo wrapper but-
139 * otherwise is RSASSA-PKCS-v1.5.-
140 */-
141 if (m_len != SSL_SIG_LENGTH) {
m_len != 36Description
TRUEnever evaluated
FALSEevaluated 15 times by 2 tests
Evaluated by:
  • servertest
  • ssltest
0-15
142 RSAerror(RSA_R_INVALID_DIGEST_LENGTH);-
143 return 0;
never executed: return 0;
0
144 }-
145 encoded_len = SSL_SIG_LENGTH;-
146 encoded = m;-
147 } else {
executed 15 times by 2 tests: end of block
Executed by:
  • servertest
  • ssltest
15
148 if (!encode_pkcs1(&tmps, &encoded_len, type, m, m_len))
!encode_pkcs1(...ype, m, m_len)Description
TRUEnever evaluated
FALSEevaluated 36 times by 5 tests
Evaluated by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
0-36
149 goto err;
never executed: goto err;
0
150 encoded = tmps;-
151 }
executed 36 times by 5 tests: end of block
Executed by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
36
152 if (encoded_len > RSA_size(rsa) - RSA_PKCS1_PADDING_SIZE) {
encoded_len > ...size(rsa) - 11Description
TRUEnever evaluated
FALSEevaluated 51 times by 5 tests
Evaluated by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
0-51
153 RSAerror(RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);-
154 goto err;
never executed: goto err;
0
155 }-
156 if ((encrypt_len = RSA_private_encrypt(encoded_len, encoded, sigret,
(encrypt_len =... rsa, 1)) <= 0Description
TRUEnever evaluated
FALSEevaluated 51 times by 5 tests
Evaluated by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
0-51
157 rsa, RSA_PKCS1_PADDING)) <= 0)
(encrypt_len =... rsa, 1)) <= 0Description
TRUEnever evaluated
FALSEevaluated 51 times by 5 tests
Evaluated by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
0-51
158 goto err;
never executed: goto err;
0
159-
160 *siglen = encrypt_len;-
161 ret = 1;-
162-
163 err:
code before this statement executed 51 times by 5 tests: err:
Executed by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
51
164 freezero(tmps, (size_t)encoded_len);-
165 return (ret);
executed 51 times by 5 tests: return (ret);
Executed by:
  • libcrypto.so.44.0.1
  • pkcs7test
  • servertest
  • ssltest
  • tlstest
51
166}-
167-
168/*-
169 * int_rsa_verify verifies an RSA signature in `sigbuf' using `rsa'. It may be-
170 * called in two modes. If `rm' is NULL, it verifies the signature for the-
171 * digest `m'. Otherwise, it recovers the digest from the signature, writing the-
172 * digest to `rm' and the length to `*prm_len'. `type' is the NID of the digest-
173 * algorithm to use. It returns one on successful verification and zero-
174 * otherwise.-
175 */-
176int-
177int_rsa_verify(int type, const unsigned char *m, unsigned int m_len,-
178 unsigned char *rm, size_t *prm_len, const unsigned char *sigbuf,-
179 size_t siglen, RSA *rsa)-
180{-
181 unsigned char *decrypt_buf, *encoded = NULL;-
182 int decrypt_len, encoded_len = 0, ret = 0;-
183-
184 if (siglen != (size_t)RSA_size(rsa)) {
siglen != (siz...)RSA_size(rsa)Description
TRUEnever evaluated
FALSEevaluated 120 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
0-120
185 RSAerror(RSA_R_WRONG_SIGNATURE_LENGTH);-
186 return 0;
never executed: return 0;
0
187 }-
188-
189 /* Recover the encoded digest. */-
190 if ((decrypt_buf = malloc(siglen)) == NULL) {
(decrypt_buf =...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 120 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
0-120
191 RSAerror(ERR_R_MALLOC_FAILURE);-
192 goto err;
never executed: goto err;
0
193 }-
194 if ((decrypt_len = RSA_public_decrypt((int)siglen, sigbuf, decrypt_buf,
(decrypt_len =... rsa, 1)) <= 0Description
TRUEnever evaluated
FALSEevaluated 120 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
0-120
195 rsa, RSA_PKCS1_PADDING)) <= 0)
(decrypt_len =... rsa, 1)) <= 0Description
TRUEnever evaluated
FALSEevaluated 120 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
0-120
196 goto err;
never executed: goto err;
0
197 -
198 if (type == NID_md5_sha1) {
type == 114Description
TRUEevaluated 14 times by 1 test
Evaluated by:
  • ssltest
FALSEevaluated 106 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
14-106
199 /*-
200 * NID_md5_sha1 corresponds to the MD5/SHA1 combination in-
201 * TLS 1.1 and earlier. It has no DigestInfo wrapper but-
202 * otherwise is RSASSA-PKCS1-v1_5.-
203 */-
204 if (decrypt_len != SSL_SIG_LENGTH) {
decrypt_len != 36Description
TRUEnever evaluated
FALSEevaluated 14 times by 1 test
Evaluated by:
  • ssltest
0-14
205 RSAerror(RSA_R_INVALID_DIGEST_LENGTH);-
206 goto err;
never executed: goto err;
0
207 }-
208-
209 if (rm != NULL) {
rm != ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 14 times by 1 test
Evaluated by:
  • ssltest
0-14
210 memcpy(rm, decrypt_buf, SSL_SIG_LENGTH);-
211 *prm_len = SSL_SIG_LENGTH;-
212 } else {
never executed: end of block
0
213 if (m_len != SSL_SIG_LENGTH) {
m_len != 36Description
TRUEnever evaluated
FALSEevaluated 14 times by 1 test
Evaluated by:
  • ssltest
0-14
214 RSAerror(RSA_R_INVALID_MESSAGE_LENGTH);-
215 goto err;
never executed: goto err;
0
216 }-
217 if (timingsafe_bcmp(decrypt_buf,
timingsafe_bcm...f, m, 36) != 0Description
TRUEnever evaluated
FALSEevaluated 14 times by 1 test
Evaluated by:
  • ssltest
0-14
218 m, SSL_SIG_LENGTH) != 0) {
timingsafe_bcm...f, m, 36) != 0Description
TRUEnever evaluated
FALSEevaluated 14 times by 1 test
Evaluated by:
  • ssltest
0-14
219 RSAerror(RSA_R_BAD_SIGNATURE);-
220 goto err;
never executed: goto err;
0
221 }-
222 }
executed 14 times by 1 test: end of block
Executed by:
  • ssltest
14
223 } else {-
224 /*-
225 * If recovering the digest, extract a digest-sized output from-
226 * the end of `decrypt_buf' for `encode_pkcs1', then compare the-
227 * decryption output as in a standard verification.-
228 */-
229 if (rm != NULL) {
rm != ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 106 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
0-106
230 const EVP_MD *md;-
231-
232 if ((md = EVP_get_digestbynid(type)) == NULL) {
(md = EVP_get_...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
233 RSAerror(RSA_R_UNKNOWN_ALGORITHM_TYPE);-
234 goto err;
never executed: goto err;
0
235 }-
236 if ((m_len = EVP_MD_size(md)) > (size_t)decrypt_len) {
(m_len = EVP_M..._t)decrypt_lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
237 RSAerror(RSA_R_INVALID_DIGEST_LENGTH);-
238 goto err;
never executed: goto err;
0
239 }-
240 m = decrypt_buf + decrypt_len - m_len;-
241 }
never executed: end of block
0
242-
243 /* Construct the encoded digest and ensure it matches */-
244 if (!encode_pkcs1(&encoded, &encoded_len, type, m, m_len))
!encode_pkcs1(...ype, m, m_len)Description
TRUEnever evaluated
FALSEevaluated 106 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
0-106
245 goto err;
never executed: goto err;
0
246-
247 if (encoded_len != decrypt_len ||
encoded_len != decrypt_lenDescription
TRUEnever evaluated
FALSEevaluated 106 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
0-106
248 timingsafe_bcmp(encoded, decrypt_buf, encoded_len) != 0) {
timingsafe_bcm...oded_len) != 0Description
TRUEnever evaluated
FALSEevaluated 106 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
0-106
249 RSAerror(RSA_R_BAD_SIGNATURE);-
250 goto err;
never executed: goto err;
0
251 }-
252-
253 /* Output the recovered digest. */-
254 if (rm != NULL) {
rm != ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 106 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
0-106
255 memcpy(rm, m, m_len);-
256 *prm_len = m_len;-
257 }
never executed: end of block
0
258 }
executed 106 times by 3 tests: end of block
Executed by:
  • pkcs7test
  • ssltest
  • tlstest
106
259-
260 ret = 1;-
261 err:
code before this statement executed 120 times by 3 tests: err:
Executed by:
  • pkcs7test
  • ssltest
  • tlstest
120
262 freezero(encoded, (size_t)encoded_len);-
263 freezero(decrypt_buf, siglen);-
264 return ret;
executed 120 times by 3 tests: return ret;
Executed by:
  • pkcs7test
  • ssltest
  • tlstest
120
265}-
266-
267int-
268RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,-
269 const unsigned char *sigbuf, unsigned int siglen, RSA *rsa)-
270{-
271 if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
(rsa->flags & 0x0040)Description
TRUEnever evaluated
FALSEevaluated 120 times by 3 tests
Evaluated by:
  • pkcs7test
  • ssltest
  • tlstest
rsa->meth->rsa_verifyDescription
TRUEnever evaluated
FALSEnever evaluated
0-120
272 return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen,
never executed: return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen, rsa);
0
273 rsa);
never executed: return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen, rsa);
0
274-
275 return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
executed 120 times by 3 tests: return int_rsa_verify(dtype, m, m_len, ((void *)0) , ((void *)0) , sigbuf, siglen, rsa);
Executed by:
  • pkcs7test
  • ssltest
  • tlstest
120
276}-
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