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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* RSA asymmetric public-key algorithm [RFC3447]
3 *
4 * Copyright (c) 2015, Intel Corporation
5 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
6 */
7
8#include <linux/fips.h>
9#include <linux/module.h>
10#include <linux/mpi.h>
11#include <crypto/internal/rsa.h>
12#include <crypto/internal/akcipher.h>
13#include <crypto/akcipher.h>
14#include <crypto/algapi.h>
15
16struct rsa_mpi_key {
17 MPI n;
18 MPI e;
19 MPI d;
20 MPI p;
21 MPI q;
22 MPI dp;
23 MPI dq;
24 MPI qinv;
25};
26
27/*
28 * RSAEP function [RFC3447 sec 5.1.1]
29 * c = m^e mod n;
30 */
31static int _rsa_enc(const struct rsa_mpi_key *key, MPI c, MPI m)
32{
33 /* (1) Validate 0 <= m < n */
34 if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0)
35 return -EINVAL;
36
37 /* (2) c = m^e mod n */
38 return mpi_powm(c, m, key->e, key->n);
39}
40
41/*
42 * RSADP function [RFC3447 sec 5.1.2]
43 * m_1 = c^dP mod p;
44 * m_2 = c^dQ mod q;
45 * h = (m_1 - m_2) * qInv mod p;
46 * m = m_2 + q * h;
47 */
48static int _rsa_dec_crt(const struct rsa_mpi_key *key, MPI m_or_m1_or_h, MPI c)
49{
50 MPI m2, m12_or_qh;
51 int ret = -ENOMEM;
52
53 /* (1) Validate 0 <= c < n */
54 if (mpi_cmp_ui(c, 0) < 0 || mpi_cmp(c, key->n) >= 0)
55 return -EINVAL;
56
57 m2 = mpi_alloc(0);
58 m12_or_qh = mpi_alloc(0);
59 if (!m2 || !m12_or_qh)
60 goto err_free_mpi;
61
62 /* (2i) m_1 = c^dP mod p */
63 ret = mpi_powm(m_or_m1_or_h, c, key->dp, key->p);
64 if (ret)
65 goto err_free_mpi;
66
67 /* (2i) m_2 = c^dQ mod q */
68 ret = mpi_powm(m2, c, key->dq, key->q);
69 if (ret)
70 goto err_free_mpi;
71
72 /* (2iii) h = (m_1 - m_2) * qInv mod p */
73 mpi_sub(m12_or_qh, m_or_m1_or_h, m2);
74 mpi_mulm(m_or_m1_or_h, m12_or_qh, key->qinv, key->p);
75
76 /* (2iv) m = m_2 + q * h */
77 mpi_mul(m12_or_qh, key->q, m_or_m1_or_h);
78 mpi_addm(m_or_m1_or_h, m2, m12_or_qh, key->n);
79
80 ret = 0;
81
82err_free_mpi:
83 mpi_free(m12_or_qh);
84 mpi_free(m2);
85 return ret;
86}
87
88static inline struct rsa_mpi_key *rsa_get_key(struct crypto_akcipher *tfm)
89{
90 return akcipher_tfm_ctx(tfm);
91}
92
93static int rsa_enc(struct akcipher_request *req)
94{
95 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
96 const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
97 MPI m, c = mpi_alloc(0);
98 int ret = 0;
99 int sign;
100
101 if (!c)
102 return -ENOMEM;
103
104 if (unlikely(!pkey->n || !pkey->e)) {
105 ret = -EINVAL;
106 goto err_free_c;
107 }
108
109 ret = -ENOMEM;
110 m = mpi_read_raw_from_sgl(req->src, req->src_len);
111 if (!m)
112 goto err_free_c;
113
114 ret = _rsa_enc(pkey, c, m);
115 if (ret)
116 goto err_free_m;
117
118 ret = mpi_write_to_sgl(c, req->dst, req->dst_len, &sign);
119 if (ret)
120 goto err_free_m;
121
122 if (sign < 0)
123 ret = -EBADMSG;
124
125err_free_m:
126 mpi_free(m);
127err_free_c:
128 mpi_free(c);
129 return ret;
130}
131
132static int rsa_dec(struct akcipher_request *req)
133{
134 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
135 const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
136 MPI c, m = mpi_alloc(0);
137 int ret = 0;
138 int sign;
139
140 if (!m)
141 return -ENOMEM;
142
143 if (unlikely(!pkey->n || !pkey->d)) {
144 ret = -EINVAL;
145 goto err_free_m;
146 }
147
148 ret = -ENOMEM;
149 c = mpi_read_raw_from_sgl(req->src, req->src_len);
150 if (!c)
151 goto err_free_m;
152
153 ret = _rsa_dec_crt(pkey, m, c);
154 if (ret)
155 goto err_free_c;
156
157 ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign);
158 if (ret)
159 goto err_free_c;
160
161 if (sign < 0)
162 ret = -EBADMSG;
163err_free_c:
164 mpi_free(c);
165err_free_m:
166 mpi_free(m);
167 return ret;
168}
169
170static void rsa_free_mpi_key(struct rsa_mpi_key *key)
171{
172 mpi_free(key->d);
173 mpi_free(key->e);
174 mpi_free(key->n);
175 mpi_free(key->p);
176 mpi_free(key->q);
177 mpi_free(key->dp);
178 mpi_free(key->dq);
179 mpi_free(key->qinv);
180 key->d = NULL;
181 key->e = NULL;
182 key->n = NULL;
183 key->p = NULL;
184 key->q = NULL;
185 key->dp = NULL;
186 key->dq = NULL;
187 key->qinv = NULL;
188}
189
190static int rsa_check_key_length(unsigned int len)
191{
192 switch (len) {
193 case 512:
194 case 1024:
195 case 1536:
196 if (fips_enabled)
197 return -EINVAL;
198 fallthrough;
199 case 2048:
200 case 3072:
201 case 4096:
202 return 0;
203 }
204
205 return -EINVAL;
206}
207
208static int rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
209 unsigned int keylen)
210{
211 struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
212 struct rsa_key raw_key = {0};
213 int ret;
214
215 /* Free the old MPI key if any */
216 rsa_free_mpi_key(mpi_key);
217
218 ret = rsa_parse_pub_key(&raw_key, key, keylen);
219 if (ret)
220 return ret;
221
222 mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
223 if (!mpi_key->e)
224 goto err;
225
226 mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
227 if (!mpi_key->n)
228 goto err;
229
230 if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
231 rsa_free_mpi_key(mpi_key);
232 return -EINVAL;
233 }
234
235 return 0;
236
237err:
238 rsa_free_mpi_key(mpi_key);
239 return -ENOMEM;
240}
241
242static int rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
243 unsigned int keylen)
244{
245 struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
246 struct rsa_key raw_key = {0};
247 int ret;
248
249 /* Free the old MPI key if any */
250 rsa_free_mpi_key(mpi_key);
251
252 ret = rsa_parse_priv_key(&raw_key, key, keylen);
253 if (ret)
254 return ret;
255
256 mpi_key->d = mpi_read_raw_data(raw_key.d, raw_key.d_sz);
257 if (!mpi_key->d)
258 goto err;
259
260 mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
261 if (!mpi_key->e)
262 goto err;
263
264 mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
265 if (!mpi_key->n)
266 goto err;
267
268 mpi_key->p = mpi_read_raw_data(raw_key.p, raw_key.p_sz);
269 if (!mpi_key->p)
270 goto err;
271
272 mpi_key->q = mpi_read_raw_data(raw_key.q, raw_key.q_sz);
273 if (!mpi_key->q)
274 goto err;
275
276 mpi_key->dp = mpi_read_raw_data(raw_key.dp, raw_key.dp_sz);
277 if (!mpi_key->dp)
278 goto err;
279
280 mpi_key->dq = mpi_read_raw_data(raw_key.dq, raw_key.dq_sz);
281 if (!mpi_key->dq)
282 goto err;
283
284 mpi_key->qinv = mpi_read_raw_data(raw_key.qinv, raw_key.qinv_sz);
285 if (!mpi_key->qinv)
286 goto err;
287
288 if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
289 rsa_free_mpi_key(mpi_key);
290 return -EINVAL;
291 }
292
293 return 0;
294
295err:
296 rsa_free_mpi_key(mpi_key);
297 return -ENOMEM;
298}
299
300static unsigned int rsa_max_size(struct crypto_akcipher *tfm)
301{
302 struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);
303
304 return mpi_get_size(pkey->n);
305}
306
307static void rsa_exit_tfm(struct crypto_akcipher *tfm)
308{
309 struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);
310
311 rsa_free_mpi_key(pkey);
312}
313
314static struct akcipher_alg rsa = {
315 .encrypt = rsa_enc,
316 .decrypt = rsa_dec,
317 .set_priv_key = rsa_set_priv_key,
318 .set_pub_key = rsa_set_pub_key,
319 .max_size = rsa_max_size,
320 .exit = rsa_exit_tfm,
321 .base = {
322 .cra_name = "rsa",
323 .cra_driver_name = "rsa-generic",
324 .cra_priority = 100,
325 .cra_module = THIS_MODULE,
326 .cra_ctxsize = sizeof(struct rsa_mpi_key),
327 },
328};
329
330static int __init rsa_init(void)
331{
332 int err;
333
334 err = crypto_register_akcipher(&rsa);
335 if (err)
336 return err;
337
338 err = crypto_register_template(&rsa_pkcs1pad_tmpl);
339 if (err) {
340 crypto_unregister_akcipher(&rsa);
341 return err;
342 }
343
344 return 0;
345}
346
347static void __exit rsa_exit(void)
348{
349 crypto_unregister_template(&rsa_pkcs1pad_tmpl);
350 crypto_unregister_akcipher(&rsa);
351}
352
353subsys_initcall(rsa_init);
354module_exit(rsa_exit);
355MODULE_ALIAS_CRYPTO("rsa");
356MODULE_LICENSE("GPL");
357MODULE_DESCRIPTION("RSA generic algorithm");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* RSA asymmetric public-key algorithm [RFC3447]
3 *
4 * Copyright (c) 2015, Intel Corporation
5 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
6 */
7
8#include <linux/fips.h>
9#include <linux/module.h>
10#include <linux/mpi.h>
11#include <crypto/internal/rsa.h>
12#include <crypto/internal/akcipher.h>
13#include <crypto/akcipher.h>
14#include <crypto/algapi.h>
15
16struct rsa_mpi_key {
17 MPI n;
18 MPI e;
19 MPI d;
20 MPI p;
21 MPI q;
22 MPI dp;
23 MPI dq;
24 MPI qinv;
25};
26
27static int rsa_check_payload(MPI x, MPI n)
28{
29 MPI n1;
30
31 if (mpi_cmp_ui(x, 1) <= 0)
32 return -EINVAL;
33
34 n1 = mpi_alloc(0);
35 if (!n1)
36 return -ENOMEM;
37
38 if (mpi_sub_ui(n1, n, 1) || mpi_cmp(x, n1) >= 0) {
39 mpi_free(n1);
40 return -EINVAL;
41 }
42
43 mpi_free(n1);
44 return 0;
45}
46
47/*
48 * RSAEP function [RFC3447 sec 5.1.1]
49 * c = m^e mod n;
50 */
51static int _rsa_enc(const struct rsa_mpi_key *key, MPI c, MPI m)
52{
53 /*
54 * Even though (1) in RFC3447 only requires 0 <= m <= n - 1, we are
55 * slightly more conservative and require 1 < m < n - 1. This is in line
56 * with SP 800-56Br2, Section 7.1.1.
57 */
58 if (rsa_check_payload(m, key->n))
59 return -EINVAL;
60
61 /* (2) c = m^e mod n */
62 return mpi_powm(c, m, key->e, key->n);
63}
64
65/*
66 * RSADP function [RFC3447 sec 5.1.2]
67 * m_1 = c^dP mod p;
68 * m_2 = c^dQ mod q;
69 * h = (m_1 - m_2) * qInv mod p;
70 * m = m_2 + q * h;
71 */
72static int _rsa_dec_crt(const struct rsa_mpi_key *key, MPI m_or_m1_or_h, MPI c)
73{
74 MPI m2, m12_or_qh;
75 int ret = -ENOMEM;
76
77 /*
78 * Even though (1) in RFC3447 only requires 0 <= c <= n - 1, we are
79 * slightly more conservative and require 1 < c < n - 1. This is in line
80 * with SP 800-56Br2, Section 7.1.2.
81 */
82 if (rsa_check_payload(c, key->n))
83 return -EINVAL;
84
85 m2 = mpi_alloc(0);
86 m12_or_qh = mpi_alloc(0);
87 if (!m2 || !m12_or_qh)
88 goto err_free_mpi;
89
90 /* (2i) m_1 = c^dP mod p */
91 ret = mpi_powm(m_or_m1_or_h, c, key->dp, key->p);
92 if (ret)
93 goto err_free_mpi;
94
95 /* (2i) m_2 = c^dQ mod q */
96 ret = mpi_powm(m2, c, key->dq, key->q);
97 if (ret)
98 goto err_free_mpi;
99
100 /* (2iii) h = (m_1 - m_2) * qInv mod p */
101 ret = mpi_sub(m12_or_qh, m_or_m1_or_h, m2) ?:
102 mpi_mulm(m_or_m1_or_h, m12_or_qh, key->qinv, key->p);
103
104 /* (2iv) m = m_2 + q * h */
105 ret = ret ?:
106 mpi_mul(m12_or_qh, key->q, m_or_m1_or_h) ?:
107 mpi_addm(m_or_m1_or_h, m2, m12_or_qh, key->n);
108
109err_free_mpi:
110 mpi_free(m12_or_qh);
111 mpi_free(m2);
112 return ret;
113}
114
115static inline struct rsa_mpi_key *rsa_get_key(struct crypto_akcipher *tfm)
116{
117 return akcipher_tfm_ctx(tfm);
118}
119
120static int rsa_enc(struct akcipher_request *req)
121{
122 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
123 const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
124 MPI m, c = mpi_alloc(0);
125 int ret = 0;
126 int sign;
127
128 if (!c)
129 return -ENOMEM;
130
131 if (unlikely(!pkey->n || !pkey->e)) {
132 ret = -EINVAL;
133 goto err_free_c;
134 }
135
136 ret = -ENOMEM;
137 m = mpi_read_raw_from_sgl(req->src, req->src_len);
138 if (!m)
139 goto err_free_c;
140
141 ret = _rsa_enc(pkey, c, m);
142 if (ret)
143 goto err_free_m;
144
145 ret = mpi_write_to_sgl(c, req->dst, req->dst_len, &sign);
146 if (ret)
147 goto err_free_m;
148
149 if (sign < 0)
150 ret = -EBADMSG;
151
152err_free_m:
153 mpi_free(m);
154err_free_c:
155 mpi_free(c);
156 return ret;
157}
158
159static int rsa_dec(struct akcipher_request *req)
160{
161 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
162 const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
163 MPI c, m = mpi_alloc(0);
164 int ret = 0;
165 int sign;
166
167 if (!m)
168 return -ENOMEM;
169
170 if (unlikely(!pkey->n || !pkey->d)) {
171 ret = -EINVAL;
172 goto err_free_m;
173 }
174
175 ret = -ENOMEM;
176 c = mpi_read_raw_from_sgl(req->src, req->src_len);
177 if (!c)
178 goto err_free_m;
179
180 ret = _rsa_dec_crt(pkey, m, c);
181 if (ret)
182 goto err_free_c;
183
184 ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign);
185 if (ret)
186 goto err_free_c;
187
188 if (sign < 0)
189 ret = -EBADMSG;
190err_free_c:
191 mpi_free(c);
192err_free_m:
193 mpi_free(m);
194 return ret;
195}
196
197static void rsa_free_mpi_key(struct rsa_mpi_key *key)
198{
199 mpi_free(key->d);
200 mpi_free(key->e);
201 mpi_free(key->n);
202 mpi_free(key->p);
203 mpi_free(key->q);
204 mpi_free(key->dp);
205 mpi_free(key->dq);
206 mpi_free(key->qinv);
207 key->d = NULL;
208 key->e = NULL;
209 key->n = NULL;
210 key->p = NULL;
211 key->q = NULL;
212 key->dp = NULL;
213 key->dq = NULL;
214 key->qinv = NULL;
215}
216
217static int rsa_check_key_length(unsigned int len)
218{
219 switch (len) {
220 case 512:
221 case 1024:
222 case 1536:
223 if (fips_enabled)
224 return -EINVAL;
225 fallthrough;
226 case 2048:
227 case 3072:
228 case 4096:
229 return 0;
230 }
231
232 return -EINVAL;
233}
234
235static int rsa_check_exponent_fips(MPI e)
236{
237 MPI e_max = NULL;
238 int err;
239
240 /* check if odd */
241 if (!mpi_test_bit(e, 0)) {
242 return -EINVAL;
243 }
244
245 /* check if 2^16 < e < 2^256. */
246 if (mpi_cmp_ui(e, 65536) <= 0) {
247 return -EINVAL;
248 }
249
250 e_max = mpi_alloc(0);
251 if (!e_max)
252 return -ENOMEM;
253
254 err = mpi_set_bit(e_max, 256);
255 if (err) {
256 mpi_free(e_max);
257 return err;
258 }
259
260 if (mpi_cmp(e, e_max) >= 0) {
261 mpi_free(e_max);
262 return -EINVAL;
263 }
264
265 mpi_free(e_max);
266 return 0;
267}
268
269static int rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
270 unsigned int keylen)
271{
272 struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
273 struct rsa_key raw_key = {0};
274 int ret;
275
276 /* Free the old MPI key if any */
277 rsa_free_mpi_key(mpi_key);
278
279 ret = rsa_parse_pub_key(&raw_key, key, keylen);
280 if (ret)
281 return ret;
282
283 mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
284 if (!mpi_key->e)
285 goto err;
286
287 mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
288 if (!mpi_key->n)
289 goto err;
290
291 if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
292 rsa_free_mpi_key(mpi_key);
293 return -EINVAL;
294 }
295
296 if (fips_enabled && rsa_check_exponent_fips(mpi_key->e)) {
297 rsa_free_mpi_key(mpi_key);
298 return -EINVAL;
299 }
300
301 return 0;
302
303err:
304 rsa_free_mpi_key(mpi_key);
305 return -ENOMEM;
306}
307
308static int rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
309 unsigned int keylen)
310{
311 struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
312 struct rsa_key raw_key = {0};
313 int ret;
314
315 /* Free the old MPI key if any */
316 rsa_free_mpi_key(mpi_key);
317
318 ret = rsa_parse_priv_key(&raw_key, key, keylen);
319 if (ret)
320 return ret;
321
322 mpi_key->d = mpi_read_raw_data(raw_key.d, raw_key.d_sz);
323 if (!mpi_key->d)
324 goto err;
325
326 mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
327 if (!mpi_key->e)
328 goto err;
329
330 mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
331 if (!mpi_key->n)
332 goto err;
333
334 mpi_key->p = mpi_read_raw_data(raw_key.p, raw_key.p_sz);
335 if (!mpi_key->p)
336 goto err;
337
338 mpi_key->q = mpi_read_raw_data(raw_key.q, raw_key.q_sz);
339 if (!mpi_key->q)
340 goto err;
341
342 mpi_key->dp = mpi_read_raw_data(raw_key.dp, raw_key.dp_sz);
343 if (!mpi_key->dp)
344 goto err;
345
346 mpi_key->dq = mpi_read_raw_data(raw_key.dq, raw_key.dq_sz);
347 if (!mpi_key->dq)
348 goto err;
349
350 mpi_key->qinv = mpi_read_raw_data(raw_key.qinv, raw_key.qinv_sz);
351 if (!mpi_key->qinv)
352 goto err;
353
354 if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
355 rsa_free_mpi_key(mpi_key);
356 return -EINVAL;
357 }
358
359 if (fips_enabled && rsa_check_exponent_fips(mpi_key->e)) {
360 rsa_free_mpi_key(mpi_key);
361 return -EINVAL;
362 }
363
364 return 0;
365
366err:
367 rsa_free_mpi_key(mpi_key);
368 return -ENOMEM;
369}
370
371static unsigned int rsa_max_size(struct crypto_akcipher *tfm)
372{
373 struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);
374
375 return mpi_get_size(pkey->n);
376}
377
378static void rsa_exit_tfm(struct crypto_akcipher *tfm)
379{
380 struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);
381
382 rsa_free_mpi_key(pkey);
383}
384
385static struct akcipher_alg rsa = {
386 .encrypt = rsa_enc,
387 .decrypt = rsa_dec,
388 .set_priv_key = rsa_set_priv_key,
389 .set_pub_key = rsa_set_pub_key,
390 .max_size = rsa_max_size,
391 .exit = rsa_exit_tfm,
392 .base = {
393 .cra_name = "rsa",
394 .cra_driver_name = "rsa-generic",
395 .cra_priority = 100,
396 .cra_module = THIS_MODULE,
397 .cra_ctxsize = sizeof(struct rsa_mpi_key),
398 },
399};
400
401static int __init rsa_init(void)
402{
403 int err;
404
405 err = crypto_register_akcipher(&rsa);
406 if (err)
407 return err;
408
409 err = crypto_register_template(&rsa_pkcs1pad_tmpl);
410 if (err)
411 goto err_unregister_rsa;
412
413 err = crypto_register_template(&rsassa_pkcs1_tmpl);
414 if (err)
415 goto err_unregister_rsa_pkcs1pad;
416
417 return 0;
418
419err_unregister_rsa_pkcs1pad:
420 crypto_unregister_template(&rsa_pkcs1pad_tmpl);
421err_unregister_rsa:
422 crypto_unregister_akcipher(&rsa);
423 return err;
424}
425
426static void __exit rsa_exit(void)
427{
428 crypto_unregister_template(&rsassa_pkcs1_tmpl);
429 crypto_unregister_template(&rsa_pkcs1pad_tmpl);
430 crypto_unregister_akcipher(&rsa);
431}
432
433subsys_initcall(rsa_init);
434module_exit(rsa_exit);
435MODULE_ALIAS_CRYPTO("rsa");
436MODULE_LICENSE("GPL");
437MODULE_DESCRIPTION("RSA generic algorithm");