rsa_sign.c@ 102334

最後變更在這個檔案從102334是 101211,由 vboxsync 提交於 17 月前
openssl-3.1.3: Applied and adjusted our OpenSSL changes to 3.1.2. bugref:10527
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1	/*
2	* Copyright 1995-2022 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	#ifndef FIPS_MODULE
22	# ifndef OPENSSL_NO_MD2
23	# include <openssl/md2.h> /* uses MD2_DIGEST_LENGTH */
24	# endif
25	# ifndef OPENSSL_NO_MD4
26	# include <openssl/md4.h> /* uses MD4_DIGEST_LENGTH */
27	# endif
28	# ifndef OPENSSL_NO_MD5
29	# include <openssl/md5.h> /* uses MD5_DIGEST_LENGTH */
30	# endif
31	# ifndef OPENSSL_NO_MDC2
32	# include <openssl/mdc2.h> /* uses MDC2_DIGEST_LENGTH */
33	# endif
34	# ifndef OPENSSL_NO_RMD160
35	# include <openssl/ripemd.h> /* uses RIPEMD160_DIGEST_LENGTH */
36	# endif
37	#endif
38	#include <openssl/sha.h> /* uses SHA???_DIGEST_LENGTH */
39	#include "crypto/rsa.h"
40	#include "rsa_local.h"
41
42	/*
43	* The general purpose ASN1 code is not available inside the FIPS provider.
44	* To remove the dependency RSASSA-PKCS1-v1_5 DigestInfo encodings can be
45	* treated as a special case by pregenerating the required ASN1 encoding.
46	* This encoding will also be shared by the default provider.
47	*
48	* The EMSA-PKCS1-v1_5 encoding method includes an ASN.1 value of type
49	* DigestInfo, where the type DigestInfo has the syntax
50	*
51	* DigestInfo ::= SEQUENCE {
52	* digestAlgorithm DigestAlgorithm,
53	* digest OCTET STRING
54	* }
55	*
56	* DigestAlgorithm ::= AlgorithmIdentifier {
57	* {PKCS1-v1-5DigestAlgorithms}
58	* }
59	*
60	* The AlgorithmIdentifier is a sequence containing the digest OID and
61	* parameters (a value of type NULL).
62	*
63	* The ENCODE_DIGESTINFO_SHA() and ENCODE_DIGESTINFO_MD() macros define an
64	* initialized array containing the DER encoded DigestInfo for the specified
65	* SHA or MD digest. The content of the OCTET STRING is not included.
66	* \|name\| is the digest name.
67	* \|n\| is last byte in the encoded OID for the digest.
68	* \|sz\| is the digest length in bytes. It must not be greater than 110.
69	*/
70
71	#define ASN1_SEQUENCE 0x30
72	#define ASN1_OCTET_STRING 0x04
73	#define ASN1_NULL 0x05
74	#define ASN1_OID 0x06
75
76	/* SHA OIDs are of the form: (2 16 840 1 101 3 4 2 \|n\|) */
77	#define ENCODE_DIGESTINFO_SHA(name, n, sz) \
78	static const unsigned char digestinfo_##name##_der[] = { \
79	ASN1_SEQUENCE, 0x11 + sz, \
80	ASN1_SEQUENCE, 0x0d, \
81	ASN1_OID, 0x09, 2 * 40 + 16, 0x86, 0x48, 1, 101, 3, 4, 2, n, \
82	ASN1_NULL, 0x00, \
83	ASN1_OCTET_STRING, sz \
84	};
85
86	/* MD2, MD4 and MD5 OIDs are of the form: (1 2 840 113549 2 \|n\|) */
87	#define ENCODE_DIGESTINFO_MD(name, n, sz) \
88	static const unsigned char digestinfo_##name##_der[] = { \
89	ASN1_SEQUENCE, 0x10 + sz, \
90	ASN1_SEQUENCE, 0x0c, \
91	ASN1_OID, 0x08, 1 * 40 + 2, 0x86, 0x48, 0x86, 0xf7, 0x0d, 2, n, \
92	ASN1_NULL, 0x00, \
93	ASN1_OCTET_STRING, sz \
94	};
95
96	#ifndef FIPS_MODULE
97	# ifndef OPENSSL_NO_MD2
98	ENCODE_DIGESTINFO_MD(md2, 0x02, MD2_DIGEST_LENGTH)
99	# endif
100	# ifndef OPENSSL_NO_MD4
101	ENCODE_DIGESTINFO_MD(md4, 0x03, MD4_DIGEST_LENGTH)
102	# endif
103	# ifndef OPENSSL_NO_MD5
104	ENCODE_DIGESTINFO_MD(md5, 0x05, MD5_DIGEST_LENGTH)
105	# endif
106	# ifndef OPENSSL_NO_MDC2
107	/* MDC-2 (2 5 8 3 101) */
108	static const unsigned char digestinfo_mdc2_der[] = {
109	ASN1_SEQUENCE, 0x0c + MDC2_DIGEST_LENGTH,
110	ASN1_SEQUENCE, 0x08,
111	ASN1_OID, 0x04, 2 * 40 + 5, 8, 3, 101,
112	ASN1_NULL, 0x00,
113	ASN1_OCTET_STRING, MDC2_DIGEST_LENGTH
114	};
115	# endif
116	# ifndef OPENSSL_NO_RMD160
117	/* RIPEMD160 (1 3 36 3 2 1) */
118	static const unsigned char digestinfo_ripemd160_der[] = {
119	ASN1_SEQUENCE, 0x0d + RIPEMD160_DIGEST_LENGTH,
120	ASN1_SEQUENCE, 0x09,
121	ASN1_OID, 0x05, 1 * 40 + 3, 36, 3, 2, 1,
122	ASN1_NULL, 0x00,
123	ASN1_OCTET_STRING, RIPEMD160_DIGEST_LENGTH
124	};
125	# endif
126	#endif /* FIPS_MODULE */
127
128	/* SHA-1 (1 3 14 3 2 26) */
129	static const unsigned char digestinfo_sha1_der[] = {
130	ASN1_SEQUENCE, 0x0d + SHA_DIGEST_LENGTH,
131	ASN1_SEQUENCE, 0x09,
132	ASN1_OID, 0x05, 1 * 40 + 3, 14, 3, 2, 26,
133	ASN1_NULL, 0x00,
134	ASN1_OCTET_STRING, SHA_DIGEST_LENGTH
135	};
136
137	ENCODE_DIGESTINFO_SHA(sha256, 0x01, SHA256_DIGEST_LENGTH)
138	ENCODE_DIGESTINFO_SHA(sha384, 0x02, SHA384_DIGEST_LENGTH)
139	ENCODE_DIGESTINFO_SHA(sha512, 0x03, SHA512_DIGEST_LENGTH)
140	ENCODE_DIGESTINFO_SHA(sha224, 0x04, SHA224_DIGEST_LENGTH)
141	ENCODE_DIGESTINFO_SHA(sha512_224, 0x05, SHA224_DIGEST_LENGTH)
142	ENCODE_DIGESTINFO_SHA(sha512_256, 0x06, SHA256_DIGEST_LENGTH)
143	ENCODE_DIGESTINFO_SHA(sha3_224, 0x07, SHA224_DIGEST_LENGTH)
144	ENCODE_DIGESTINFO_SHA(sha3_256, 0x08, SHA256_DIGEST_LENGTH)
145	ENCODE_DIGESTINFO_SHA(sha3_384, 0x09, SHA384_DIGEST_LENGTH)
146	ENCODE_DIGESTINFO_SHA(sha3_512, 0x0a, SHA512_DIGEST_LENGTH)
147
148	#define MD_CASE(name) \
149	case NID_##name: \
150	*len = sizeof(digestinfo_##name##_der); \
151	return digestinfo_##name##_der;
152
153	const unsigned char ossl_rsa_digestinfo_encoding(int md_nid, size_t len)
154	{
155	switch (md_nid) {
156	#ifndef FIPS_MODULE
157	# ifndef OPENSSL_NO_MDC2
158	MD_CASE(mdc2)
159	# endif
160	# ifndef OPENSSL_NO_MD2
161	MD_CASE(md2)
162	# endif
163	# ifndef OPENSSL_NO_MD4
164	MD_CASE(md4)
165	# endif
166	# ifndef OPENSSL_NO_MD5
167	MD_CASE(md5)
168	# endif
169	# ifndef OPENSSL_NO_RMD160
170	MD_CASE(ripemd160)
171	# endif
172	#endif /* FIPS_MODULE */
173	MD_CASE(sha1)
174	MD_CASE(sha224)
175	MD_CASE(sha256)
176	MD_CASE(sha384)
177	MD_CASE(sha512)
178	MD_CASE(sha512_224)
179	MD_CASE(sha512_256)
180	MD_CASE(sha3_224)
181	MD_CASE(sha3_256)
182	MD_CASE(sha3_384)
183	MD_CASE(sha3_512)
184	default:
185	return NULL;
186	}
187	}
188
189	#define MD_NID_CASE(name, sz) \
190	case NID_##name: \
191	return sz;
192
193	static int digest_sz_from_nid(int nid)
194	{
195	switch (nid) {
196	#ifndef FIPS_MODULE
197	# ifndef OPENSSL_NO_MDC2
198	MD_NID_CASE(mdc2, MDC2_DIGEST_LENGTH)
199	# endif
200	# ifndef OPENSSL_NO_MD2
201	MD_NID_CASE(md2, MD2_DIGEST_LENGTH)
202	# endif
203	# ifndef OPENSSL_NO_MD4
204	MD_NID_CASE(md4, MD4_DIGEST_LENGTH)
205	# endif
206	# ifndef OPENSSL_NO_MD5
207	MD_NID_CASE(md5, MD5_DIGEST_LENGTH)
208	# endif
209	# ifndef OPENSSL_NO_RMD160
210	MD_NID_CASE(ripemd160, RIPEMD160_DIGEST_LENGTH)
211	# endif
212	#endif /* FIPS_MODULE */
213	MD_NID_CASE(sha1, SHA_DIGEST_LENGTH)
214	MD_NID_CASE(sha224, SHA224_DIGEST_LENGTH)
215	MD_NID_CASE(sha256, SHA256_DIGEST_LENGTH)
216	MD_NID_CASE(sha384, SHA384_DIGEST_LENGTH)
217	MD_NID_CASE(sha512, SHA512_DIGEST_LENGTH)
218	MD_NID_CASE(sha512_224, SHA224_DIGEST_LENGTH)
219	MD_NID_CASE(sha512_256, SHA256_DIGEST_LENGTH)
220	MD_NID_CASE(sha3_224, SHA224_DIGEST_LENGTH)
221	MD_NID_CASE(sha3_256, SHA256_DIGEST_LENGTH)
222	MD_NID_CASE(sha3_384, SHA384_DIGEST_LENGTH)
223	MD_NID_CASE(sha3_512, SHA512_DIGEST_LENGTH)
224	default:
225	return 0;
226	}
227	}
228
229
230	/* Size of an SSL signature: MD5+SHA1 */
231	#define SSL_SIG_LENGTH 36
232
233	/*
234	* Encodes a DigestInfo prefix of hash \|type\| and digest \|m\|, as
235	* described in EMSA-PKCS1-v1_5-ENCODE, RFC 3447 section 9.2 step 2. This
236	* encodes the DigestInfo (T and tLen) but does not add the padding.
237	*
238	* On success, it returns one and sets \|*out\| to a newly allocated buffer
239	* containing the result and \|*out_len\| to its length. The caller must free
240	* \|*out\| with OPENSSL_free(). Otherwise, it returns zero.
241	*/
242	static int encode_pkcs1(unsigned char *out, size_t out_len, int type,
243	const unsigned char *m, size_t m_len)
244	{
245	size_t di_prefix_len, dig_info_len;
246	const unsigned char *di_prefix;
247	unsigned char *dig_info;
248
249	if (type == NID_undef) {
250	ERR_raise(ERR_LIB_RSA, RSA_R_UNKNOWN_ALGORITHM_TYPE);
251	return 0;
252	}
253	di_prefix = ossl_rsa_digestinfo_encoding(type, &di_prefix_len);
254	if (di_prefix == NULL) {
255	ERR_raise(ERR_LIB_RSA,
256	RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
257	return 0;
258	}
259	dig_info_len = di_prefix_len + m_len;
260	dig_info = OPENSSL_malloc(dig_info_len);
261	if (dig_info == NULL) {
262	ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE);
263	return 0;
264	}
265	memcpy(dig_info, di_prefix, di_prefix_len);
266	memcpy(dig_info + di_prefix_len, m, m_len);
267
268	*out = dig_info;
269	*out_len = dig_info_len;
270	return 1;
271	}
272
273	int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
274	unsigned char sigret, unsigned int siglen, RSA *rsa)
275	{
276	int encrypt_len, ret = 0;
277	size_t encoded_len = 0;
278	unsigned char *tmps = NULL;
279	const unsigned char *encoded = NULL;
280
281	#ifndef FIPS_MODULE
282	if (rsa->meth->rsa_sign != NULL)
283	return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa) > 0;
284	#endif /* FIPS_MODULE */
285
286	/* Compute the encoded digest. */
287	if (type == NID_md5_sha1) {
288	/*
289	* NID_md5_sha1 corresponds to the MD5/SHA1 combination in TLS 1.1 and
290	* earlier. It has no DigestInfo wrapper but otherwise is
291	* RSASSA-PKCS1-v1_5.
292	*/
293	if (m_len != SSL_SIG_LENGTH) {
294	ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_MESSAGE_LENGTH);
295	return 0;
296	}
297	encoded_len = SSL_SIG_LENGTH;
298	encoded = m;
299	} else {
300	if (!encode_pkcs1(&tmps, &encoded_len, type, m, m_len))
301	goto err;
302	encoded = tmps;
303	}
304
305	if (encoded_len + RSA_PKCS1_PADDING_SIZE > (size_t)RSA_size(rsa)) {
306	ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
307	goto err;
308	}
309	encrypt_len = RSA_private_encrypt((int)encoded_len, encoded, sigret, rsa,
310	RSA_PKCS1_PADDING);
311	if (encrypt_len <= 0)
312	goto err;
313
314	*siglen = encrypt_len;
315	ret = 1;
316
317	err:
318	OPENSSL_clear_free(tmps, encoded_len);
319	return ret;
320	}
321
322	/*
323	* Verify an RSA signature in \|sigbuf\| using \|rsa\|.
324	* \|type\| is the NID of the digest algorithm to use.
325	* If \|rm\| is NULL, it verifies the signature for digest \|m\|, otherwise
326	* it recovers the digest from the signature, writing the digest to \|rm\| and
327	* the length to \|*prm_len\|.
328	*
329	* It returns one on successful verification or zero otherwise.
330	*/
331	int ossl_rsa_verify(int type, const unsigned char *m, unsigned int m_len,
332	unsigned char rm, size_t prm_len,
333	const unsigned char sigbuf, size_t siglen, RSA rsa)
334	{
335	int len, ret = 0;
336	size_t decrypt_len, encoded_len = 0;
337	unsigned char decrypt_buf = NULL, encoded = NULL;
338
339	if (siglen != (size_t)RSA_size(rsa)) {
340	ERR_raise(ERR_LIB_RSA, RSA_R_WRONG_SIGNATURE_LENGTH);
341	return 0;
342	}
343
344	/* Recover the encoded digest. */
345	decrypt_buf = OPENSSL_malloc(siglen);
346	if (decrypt_buf == NULL) {
347	ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE);
348	goto err;
349	}
350
351	len = RSA_public_decrypt((int)siglen, sigbuf, decrypt_buf, rsa,
352	RSA_PKCS1_PADDING);
353	if (len <= 0)
354	goto err;
355	decrypt_len = len;
356
357	#ifndef FIPS_MODULE
358	if (type == NID_md5_sha1) {
359	/*
360	* NID_md5_sha1 corresponds to the MD5/SHA1 combination in TLS 1.1 and
361	* earlier. It has no DigestInfo wrapper but otherwise is
362	* RSASSA-PKCS1-v1_5.
363	*/
364	if (decrypt_len != SSL_SIG_LENGTH) {
365	ERR_raise(ERR_LIB_RSA, RSA_R_BAD_SIGNATURE);
366	goto err;
367	}
368
369	if (rm != NULL) {
370	memcpy(rm, decrypt_buf, SSL_SIG_LENGTH);
371	*prm_len = SSL_SIG_LENGTH;
372	} else {
373	if (m_len != SSL_SIG_LENGTH) {
374	ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_MESSAGE_LENGTH);
375	goto err;
376	}
377
378	if (memcmp(decrypt_buf, m, SSL_SIG_LENGTH) != 0) {
379	ERR_raise(ERR_LIB_RSA, RSA_R_BAD_SIGNATURE);
380	goto err;
381	}
382	}
383	} else if (type == NID_mdc2 && decrypt_len == 2 + 16
384	&& decrypt_buf[0] == 0x04 && decrypt_buf[1] == 0x10) {
385	/*
386	* Oddball MDC2 case: signature can be OCTET STRING. check for correct
387	* tag and length octets.
388	*/
389	if (rm != NULL) {
390	memcpy(rm, decrypt_buf + 2, 16);
391	*prm_len = 16;
392	} else {
393	if (m_len != 16) {
394	ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_MESSAGE_LENGTH);
395	goto err;
396	}
397
398	if (memcmp(m, decrypt_buf + 2, 16) != 0) {
399	ERR_raise(ERR_LIB_RSA, RSA_R_BAD_SIGNATURE);
400	goto err;
401	}
402	}
403	} else
404	#endif /* FIPS_MODULE */
405	{
406	/*
407	* If recovering the digest, extract a digest-sized output from the end
408	* of \|decrypt_buf\| for \|encode_pkcs1\|, then compare the decryption
409	* output as in a standard verification.
410	*/
411	if (rm != NULL) {
412	len = digest_sz_from_nid(type);
413
414	if (len <= 0)
415	goto err;
416	m_len = (unsigned int)len;
417	if (m_len > decrypt_len) {
418	ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_DIGEST_LENGTH);
419	goto err;
420	}
421	m = decrypt_buf + decrypt_len - m_len;
422	}
423
424	/* Construct the encoded digest and ensure it matches. */
425	if (!encode_pkcs1(&encoded, &encoded_len, type, m, m_len))
426	goto err;
427
428	if (encoded_len != decrypt_len
429	\|\| memcmp(encoded, decrypt_buf, encoded_len) != 0) {
430	ERR_raise(ERR_LIB_RSA, RSA_R_BAD_SIGNATURE);
431	goto err;
432	}
433
434	/* Output the recovered digest. */
435	if (rm != NULL) {
436	memcpy(rm, m, m_len);
437	*prm_len = m_len;
438	}
439	}
440
441	ret = 1;
442
443	err:
444	OPENSSL_clear_free(encoded, encoded_len);
445	OPENSSL_clear_free(decrypt_buf, siglen);
446	return ret;
447	}
448
449	int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
450	const unsigned char sigbuf, unsigned int siglen, RSA rsa)
451	{
452
453	if (rsa->meth->rsa_verify != NULL)
454	return rsa->meth->rsa_verify(type, m, m_len, sigbuf, siglen, rsa);
455
456	return ossl_rsa_verify(type, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
457	}

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