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-rw-r--r--crypto/Kconfig8
-rw-r--r--crypto/Makefile8
-rw-r--r--crypto/rsa.c315
-rw-r--r--crypto/rsa_helper.c121
-rw-r--r--crypto/rsakey.asn15
-rw-r--r--include/crypto/internal/rsa.h27
6 files changed, 484 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index eb0aca45d430..d6b2a8b68143 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -100,6 +100,14 @@ config CRYPTO_AKCIPHER
100 select CRYPTO_AKCIPHER2 100 select CRYPTO_AKCIPHER2
101 select CRYPTO_ALGAPI 101 select CRYPTO_ALGAPI
102 102
103config CRYPTO_RSA
104 tristate "RSA algorithm"
105 select AKCIPHER
106 select MPILIB
107 select ASN1
108 help
109 Generic implementation of the RSA public key algorithm.
110
103config CRYPTO_MANAGER 111config CRYPTO_MANAGER
104 tristate "Cryptographic algorithm manager" 112 tristate "Cryptographic algorithm manager"
105 select CRYPTO_MANAGER2 113 select CRYPTO_MANAGER2
diff --git a/crypto/Makefile b/crypto/Makefile
index 1ed382df7db9..0077476f5024 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -30,6 +30,14 @@ obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
30obj-$(CONFIG_CRYPTO_PCOMP2) += pcompress.o 30obj-$(CONFIG_CRYPTO_PCOMP2) += pcompress.o
31obj-$(CONFIG_CRYPTO_AKCIPHER2) += akcipher.o 31obj-$(CONFIG_CRYPTO_AKCIPHER2) += akcipher.o
32 32
33$(obj)/rsakey-asn1.o: $(obj)/rsakey-asn1.c $(obj)/rsakey-asn1.h
34clean-files += rsakey-asn1.c rsakey-asn1.h
35
36rsa_generic-y := rsakey-asn1.o
37rsa_generic-y += rsa.o
38rsa_generic-y += rsa_helper.o
39obj-$(CONFIG_CRYPTO_RSA) += rsa_generic.o
40
33cryptomgr-y := algboss.o testmgr.o 41cryptomgr-y := algboss.o testmgr.o
34 42
35obj-$(CONFIG_CRYPTO_MANAGER2) += cryptomgr.o 43obj-$(CONFIG_CRYPTO_MANAGER2) += cryptomgr.o
diff --git a/crypto/rsa.c b/crypto/rsa.c
new file mode 100644
index 000000000000..752af0656f2e
--- /dev/null
+++ b/crypto/rsa.c
@@ -0,0 +1,315 @@
1/* RSA asymmetric public-key algorithm [RFC3447]
2 *
3 * Copyright (c) 2015, Intel Corporation
4 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12#include <linux/module.h>
13#include <crypto/internal/rsa.h>
14#include <crypto/internal/akcipher.h>
15#include <crypto/akcipher.h>
16
17/*
18 * RSAEP function [RFC3447 sec 5.1.1]
19 * c = m^e mod n;
20 */
21static int _rsa_enc(const struct rsa_key *key, MPI c, MPI m)
22{
23 /* (1) Validate 0 <= m < n */
24 if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0)
25 return -EINVAL;
26
27 /* (2) c = m^e mod n */
28 return mpi_powm(c, m, key->e, key->n);
29}
30
31/*
32 * RSADP function [RFC3447 sec 5.1.2]
33 * m = c^d mod n;
34 */
35static int _rsa_dec(const struct rsa_key *key, MPI m, MPI c)
36{
37 /* (1) Validate 0 <= c < n */
38 if (mpi_cmp_ui(c, 0) < 0 || mpi_cmp(c, key->n) >= 0)
39 return -EINVAL;
40
41 /* (2) m = c^d mod n */
42 return mpi_powm(m, c, key->d, key->n);
43}
44
45/*
46 * RSASP1 function [RFC3447 sec 5.2.1]
47 * s = m^d mod n
48 */
49static int _rsa_sign(const struct rsa_key *key, MPI s, MPI m)
50{
51 /* (1) Validate 0 <= m < n */
52 if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0)
53 return -EINVAL;
54
55 /* (2) s = m^d mod n */
56 return mpi_powm(s, m, key->d, key->n);
57}
58
59/*
60 * RSAVP1 function [RFC3447 sec 5.2.2]
61 * m = s^e mod n;
62 */
63static int _rsa_verify(const struct rsa_key *key, MPI m, MPI s)
64{
65 /* (1) Validate 0 <= s < n */
66 if (mpi_cmp_ui(s, 0) < 0 || mpi_cmp(s, key->n) >= 0)
67 return -EINVAL;
68
69 /* (2) m = s^e mod n */
70 return mpi_powm(m, s, key->e, key->n);
71}
72
73static inline struct rsa_key *rsa_get_key(struct crypto_akcipher *tfm)
74{
75 return akcipher_tfm_ctx(tfm);
76}
77
78static int rsa_enc(struct akcipher_request *req)
79{
80 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
81 const struct rsa_key *pkey = rsa_get_key(tfm);
82 MPI m, c = mpi_alloc(0);
83 int ret = 0;
84 int sign;
85
86 if (!c)
87 return -ENOMEM;
88
89 if (unlikely(!pkey->n || !pkey->e)) {
90 ret = -EINVAL;
91 goto err_free_c;
92 }
93
94 if (req->dst_len < mpi_get_size(pkey->n)) {
95 req->dst_len = mpi_get_size(pkey->n);
96 ret = -EOVERFLOW;
97 goto err_free_c;
98 }
99
100 m = mpi_read_raw_data(req->src, req->src_len);
101 if (!m) {
102 ret = -ENOMEM;
103 goto err_free_c;
104 }
105
106 ret = _rsa_enc(pkey, c, m);
107 if (ret)
108 goto err_free_m;
109
110 ret = mpi_read_buffer(c, req->dst, req->dst_len, &req->dst_len, &sign);
111 if (ret)
112 goto err_free_m;
113
114 if (sign < 0) {
115 ret = -EBADMSG;
116 goto err_free_m;
117 }
118
119err_free_m:
120 mpi_free(m);
121err_free_c:
122 mpi_free(c);
123 return ret;
124}
125
126static int rsa_dec(struct akcipher_request *req)
127{
128 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
129 const struct rsa_key *pkey = rsa_get_key(tfm);
130 MPI c, m = mpi_alloc(0);
131 int ret = 0;
132 int sign;
133
134 if (!m)
135 return -ENOMEM;
136
137 if (unlikely(!pkey->n || !pkey->d)) {
138 ret = -EINVAL;
139 goto err_free_m;
140 }
141
142 if (req->dst_len < mpi_get_size(pkey->n)) {
143 req->dst_len = mpi_get_size(pkey->n);
144 ret = -EOVERFLOW;
145 goto err_free_m;
146 }
147
148 c = mpi_read_raw_data(req->src, req->src_len);
149 if (!c) {
150 ret = -ENOMEM;
151 goto err_free_m;
152 }
153
154 ret = _rsa_dec(pkey, m, c);
155 if (ret)
156 goto err_free_c;
157
158 ret = mpi_read_buffer(m, req->dst, req->dst_len, &req->dst_len, &sign);
159 if (ret)
160 goto err_free_c;
161
162 if (sign < 0) {
163 ret = -EBADMSG;
164 goto err_free_c;
165 }
166
167err_free_c:
168 mpi_free(c);
169err_free_m:
170 mpi_free(m);
171 return ret;
172}
173
174static int rsa_sign(struct akcipher_request *req)
175{
176 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
177 const struct rsa_key *pkey = rsa_get_key(tfm);
178 MPI m, s = mpi_alloc(0);
179 int ret = 0;
180 int sign;
181
182 if (!s)
183 return -ENOMEM;
184
185 if (unlikely(!pkey->n || !pkey->d)) {
186 ret = -EINVAL;
187 goto err_free_s;
188 }
189
190 if (req->dst_len < mpi_get_size(pkey->n)) {
191 req->dst_len = mpi_get_size(pkey->n);
192 ret = -EOVERFLOW;
193 goto err_free_s;
194 }
195
196 m = mpi_read_raw_data(req->src, req->src_len);
197 if (!m) {
198 ret = -ENOMEM;
199 goto err_free_s;
200 }
201
202 ret = _rsa_sign(pkey, s, m);
203 if (ret)
204 goto err_free_m;
205
206 ret = mpi_read_buffer(s, req->dst, req->dst_len, &req->dst_len, &sign);
207 if (ret)
208 goto err_free_m;
209
210 if (sign < 0) {
211 ret = -EBADMSG;
212 goto err_free_m;
213 }
214
215err_free_m:
216 mpi_free(m);
217err_free_s:
218 mpi_free(s);
219 return ret;
220}
221
222static int rsa_verify(struct akcipher_request *req)
223{
224 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
225 const struct rsa_key *pkey = rsa_get_key(tfm);
226 MPI s, m = mpi_alloc(0);
227 int ret = 0;
228 int sign;
229
230 if (!m)
231 return -ENOMEM;
232
233 if (unlikely(!pkey->n || !pkey->e)) {
234 ret = -EINVAL;
235 goto err_free_m;
236 }
237
238 if (req->dst_len < mpi_get_size(pkey->n)) {
239 req->dst_len = mpi_get_size(pkey->n);
240 ret = -EOVERFLOW;
241 goto err_free_m;
242 }
243
244 s = mpi_read_raw_data(req->src, req->src_len);
245 if (!s) {
246 ret = -ENOMEM;
247 goto err_free_m;
248 }
249
250 ret = _rsa_verify(pkey, m, s);
251 if (ret)
252 goto err_free_s;
253
254 ret = mpi_read_buffer(m, req->dst, req->dst_len, &req->dst_len, &sign);
255 if (ret)
256 goto err_free_s;
257
258 if (sign < 0) {
259 ret = -EBADMSG;
260 goto err_free_s;
261 }
262
263err_free_s:
264 mpi_free(s);
265err_free_m:
266 mpi_free(m);
267 return ret;
268}
269
270static int rsa_setkey(struct crypto_akcipher *tfm, const void *key,
271 unsigned int keylen)
272{
273 struct rsa_key *pkey = akcipher_tfm_ctx(tfm);
274
275 return rsa_parse_key(pkey, key, keylen);
276}
277
278static void rsa_exit_tfm(struct crypto_akcipher *tfm)
279{
280 struct rsa_key *pkey = akcipher_tfm_ctx(tfm);
281
282 rsa_free_key(pkey);
283}
284
285static struct akcipher_alg rsa = {
286 .encrypt = rsa_enc,
287 .decrypt = rsa_dec,
288 .sign = rsa_sign,
289 .verify = rsa_verify,
290 .setkey = rsa_setkey,
291 .exit = rsa_exit_tfm,
292 .base = {
293 .cra_name = "rsa",
294 .cra_driver_name = "rsa-generic",
295 .cra_priority = 100,
296 .cra_module = THIS_MODULE,
297 .cra_ctxsize = sizeof(struct rsa_key),
298 },
299};
300
301static int rsa_init(void)
302{
303 return crypto_register_akcipher(&rsa);
304}
305
306static void rsa_exit(void)
307{
308 crypto_unregister_akcipher(&rsa);
309}
310
311module_init(rsa_init);
312module_exit(rsa_exit);
313MODULE_ALIAS_CRYPTO("rsa");
314MODULE_LICENSE("GPL");
315MODULE_DESCRIPTION("RSA generic algorithm");
diff --git a/crypto/rsa_helper.c b/crypto/rsa_helper.c
new file mode 100644
index 000000000000..3e8e0a9e5a8e
--- /dev/null
+++ b/crypto/rsa_helper.c
@@ -0,0 +1,121 @@
1/*
2 * RSA key extract helper
3 *
4 * Copyright (c) 2015, Intel Corporation
5 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 */
13#include <linux/kernel.h>
14#include <linux/export.h>
15#include <linux/err.h>
16#include <linux/fips.h>
17#include <crypto/internal/rsa.h>
18#include "rsakey-asn1.h"
19
20int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,
21 const void *value, size_t vlen)
22{
23 struct rsa_key *key = context;
24
25 key->n = mpi_read_raw_data(value, vlen);
26
27 if (!key->n)
28 return -ENOMEM;
29
30 /* In FIPS mode only allow key size 2K & 3K */
31 if (fips_enabled && (mpi_get_size(key->n) != 256 ||
32 mpi_get_size(key->n) != 384)) {
33 pr_err("RSA: key size not allowed in FIPS mode\n");
34 mpi_free(key->n);
35 key->n = NULL;
36 return -EINVAL;
37 }
38 return 0;
39}
40
41int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,
42 const void *value, size_t vlen)
43{
44 struct rsa_key *key = context;
45
46 key->e = mpi_read_raw_data(value, vlen);
47
48 if (!key->e)
49 return -ENOMEM;
50
51 return 0;
52}
53
54int rsa_get_d(void *context, size_t hdrlen, unsigned char tag,
55 const void *value, size_t vlen)
56{
57 struct rsa_key *key = context;
58
59 key->d = mpi_read_raw_data(value, vlen);
60
61 if (!key->d)
62 return -ENOMEM;
63
64 /* In FIPS mode only allow key size 2K & 3K */
65 if (fips_enabled && (mpi_get_size(key->d) != 256 ||
66 mpi_get_size(key->d) != 384)) {
67 pr_err("RSA: key size not allowed in FIPS mode\n");
68 mpi_free(key->d);
69 key->d = NULL;
70 return -EINVAL;
71 }
72 return 0;
73}
74
75static void free_mpis(struct rsa_key *key)
76{
77 mpi_free(key->n);
78 mpi_free(key->e);
79 mpi_free(key->d);
80 key->n = NULL;
81 key->e = NULL;
82 key->d = NULL;
83}
84
85/**
86 * rsa_free_key() - frees rsa key allocated by rsa_parse_key()
87 *
88 * @rsa_key: struct rsa_key key representation
89 */
90void rsa_free_key(struct rsa_key *key)
91{
92 free_mpis(key);
93}
94EXPORT_SYMBOL_GPL(rsa_free_key);
95
96/**
97 * rsa_parse_key() - extracts an rsa key from BER encoded buffer
98 * and stores it in the provided struct rsa_key
99 *
100 * @rsa_key: struct rsa_key key representation
101 * @key: key in BER format
102 * @key_len: length of key
103 *
104 * Return: 0 on success or error code in case of error
105 */
106int rsa_parse_key(struct rsa_key *rsa_key, const void *key,
107 unsigned int key_len)
108{
109 int ret;
110
111 free_mpis(rsa_key);
112 ret = asn1_ber_decoder(&rsakey_decoder, rsa_key, key, key_len);
113 if (ret < 0)
114 goto error;
115
116 return 0;
117error:
118 free_mpis(rsa_key);
119 return ret;
120}
121EXPORT_SYMBOL_GPL(rsa_parse_key);
diff --git a/crypto/rsakey.asn1 b/crypto/rsakey.asn1
new file mode 100644
index 000000000000..3c7b5df7b428
--- /dev/null
+++ b/crypto/rsakey.asn1
@@ -0,0 +1,5 @@
1RsaKey ::= SEQUENCE {
2 n INTEGER ({ rsa_get_n }),
3 e INTEGER ({ rsa_get_e }),
4 d INTEGER ({ rsa_get_d })
5}
diff --git a/include/crypto/internal/rsa.h b/include/crypto/internal/rsa.h
new file mode 100644
index 000000000000..a8c86365439f
--- /dev/null
+++ b/include/crypto/internal/rsa.h
@@ -0,0 +1,27 @@
1/*
2 * RSA internal helpers
3 *
4 * Copyright (c) 2015, Intel Corporation
5 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 */
13#ifndef _RSA_HELPER_
14#define _RSA_HELPER_
15#include <linux/mpi.h>
16
17struct rsa_key {
18 MPI n;
19 MPI e;
20 MPI d;
21};
22
23int rsa_parse_key(struct rsa_key *rsa_key, const void *key,
24 unsigned int key_len);
25
26void rsa_free_key(struct rsa_key *rsa_key);
27#endif
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