1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * PRNG: Pseudo Random Number Generator 2 * PRNG: Pseudo Random Number Generator
4 * Based on NIST Recommended PRNG From A 3 * Based on NIST Recommended PRNG From ANSI X9.31 Appendix A.2.4 using
5 * AES 128 cipher 4 * AES 128 cipher
6 * 5 *
7 * (C) Neil Horman <nhorman@tuxdriver.com> 6 * (C) Neil Horman <nhorman@tuxdriver.com>
>> 7 *
>> 8 * This program is free software; you can redistribute it and/or modify it
>> 9 * under the terms of the GNU General Public License as published by the
>> 10 * Free Software Foundation; either version 2 of the License, or (at your
>> 11 * any later version.
>> 12 *
>> 13 *
8 */ 14 */
9 15
10 #include <crypto/internal/cipher.h> <<
11 #include <crypto/internal/rng.h> 16 #include <crypto/internal/rng.h>
12 #include <linux/err.h> 17 #include <linux/err.h>
13 #include <linux/init.h> 18 #include <linux/init.h>
14 #include <linux/module.h> 19 #include <linux/module.h>
15 #include <linux/moduleparam.h> 20 #include <linux/moduleparam.h>
16 #include <linux/string.h> 21 #include <linux/string.h>
17 22
>> 23 #include "internal.h"
>> 24
18 #define DEFAULT_PRNG_KEY "0123456789abcdef" 25 #define DEFAULT_PRNG_KEY "0123456789abcdef"
19 #define DEFAULT_PRNG_KSZ 16 26 #define DEFAULT_PRNG_KSZ 16
20 #define DEFAULT_BLK_SZ 16 27 #define DEFAULT_BLK_SZ 16
21 #define DEFAULT_V_SEED "zaybxcwdveuftgsh" 28 #define DEFAULT_V_SEED "zaybxcwdveuftgsh"
22 29
23 /* 30 /*
24 * Flags for the prng_context flags field 31 * Flags for the prng_context flags field
25 */ 32 */
26 33
27 #define PRNG_FIXED_SIZE 0x1 34 #define PRNG_FIXED_SIZE 0x1
28 #define PRNG_NEED_RESET 0x2 35 #define PRNG_NEED_RESET 0x2
29 36
30 /* 37 /*
31 * Note: DT is our counter value 38 * Note: DT is our counter value
32 * I is our intermediate value 39 * I is our intermediate value
33 * V is our seed vector 40 * V is our seed vector
34 * See http://csrc.nist.gov/groups/STM/cavp/do 41 * See http://csrc.nist.gov/groups/STM/cavp/documents/rng/931rngext.pdf
35 * for implementation details 42 * for implementation details
36 */ 43 */
37 44
38 45
39 struct prng_context { 46 struct prng_context {
40 spinlock_t prng_lock; 47 spinlock_t prng_lock;
41 unsigned char rand_data[DEFAULT_BLK_SZ 48 unsigned char rand_data[DEFAULT_BLK_SZ];
42 unsigned char last_rand_data[DEFAULT_B 49 unsigned char last_rand_data[DEFAULT_BLK_SZ];
43 unsigned char DT[DEFAULT_BLK_SZ]; 50 unsigned char DT[DEFAULT_BLK_SZ];
44 unsigned char I[DEFAULT_BLK_SZ]; 51 unsigned char I[DEFAULT_BLK_SZ];
45 unsigned char V[DEFAULT_BLK_SZ]; 52 unsigned char V[DEFAULT_BLK_SZ];
46 u32 rand_data_valid; 53 u32 rand_data_valid;
47 struct crypto_cipher *tfm; 54 struct crypto_cipher *tfm;
48 u32 flags; 55 u32 flags;
49 }; 56 };
50 57
51 static int dbg; 58 static int dbg;
52 59
53 static void hexdump(char *note, unsigned char 60 static void hexdump(char *note, unsigned char *buf, unsigned int len)
54 { 61 {
55 if (dbg) { 62 if (dbg) {
56 printk(KERN_CRIT "%s", note); 63 printk(KERN_CRIT "%s", note);
57 print_hex_dump(KERN_CONT, "", 64 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_OFFSET,
58 16, 1, 65 16, 1,
59 buf, len, fals 66 buf, len, false);
60 } 67 }
61 } 68 }
62 69
63 #define dbgprint(format, args...) do {\ 70 #define dbgprint(format, args...) do {\
64 if (dbg)\ 71 if (dbg)\
65 printk(format, ##args);\ 72 printk(format, ##args);\
66 } while (0) 73 } while (0)
67 74
68 static void xor_vectors(unsigned char *in1, un 75 static void xor_vectors(unsigned char *in1, unsigned char *in2,
69 unsigned char *out, un 76 unsigned char *out, unsigned int size)
70 { 77 {
71 int i; 78 int i;
72 79
73 for (i = 0; i < size; i++) 80 for (i = 0; i < size; i++)
74 out[i] = in1[i] ^ in2[i]; 81 out[i] = in1[i] ^ in2[i];
75 82
76 } 83 }
77 /* 84 /*
78 * Returns DEFAULT_BLK_SZ bytes of random data 85 * Returns DEFAULT_BLK_SZ bytes of random data per call
79 * returns 0 if generation succeeded, <0 if so !! 86 * returns 0 if generation succeded, <0 if something went wrong
80 */ 87 */
81 static int _get_more_prng_bytes(struct prng_co !! 88 static int _get_more_prng_bytes(struct prng_context *ctx)
82 { 89 {
83 int i; 90 int i;
84 unsigned char tmp[DEFAULT_BLK_SZ]; 91 unsigned char tmp[DEFAULT_BLK_SZ];
85 unsigned char *output = NULL; 92 unsigned char *output = NULL;
86 93
87 94
88 dbgprint(KERN_CRIT "Calling _get_more_ 95 dbgprint(KERN_CRIT "Calling _get_more_prng_bytes for context %p\n",
89 ctx); 96 ctx);
90 97
91 hexdump("Input DT: ", ctx->DT, DEFAULT 98 hexdump("Input DT: ", ctx->DT, DEFAULT_BLK_SZ);
92 hexdump("Input I: ", ctx->I, DEFAULT_B 99 hexdump("Input I: ", ctx->I, DEFAULT_BLK_SZ);
93 hexdump("Input V: ", ctx->V, DEFAULT_B 100 hexdump("Input V: ", ctx->V, DEFAULT_BLK_SZ);
94 101
95 /* 102 /*
96 * This algorithm is a 3 stage state m 103 * This algorithm is a 3 stage state machine
97 */ 104 */
98 for (i = 0; i < 3; i++) { 105 for (i = 0; i < 3; i++) {
99 106
100 switch (i) { 107 switch (i) {
101 case 0: 108 case 0:
102 /* 109 /*
103 * Start by encrypting 110 * Start by encrypting the counter value
104 * This gives us an in 111 * This gives us an intermediate value I
105 */ 112 */
106 memcpy(tmp, ctx->DT, D 113 memcpy(tmp, ctx->DT, DEFAULT_BLK_SZ);
107 output = ctx->I; 114 output = ctx->I;
108 hexdump("tmp stage 0: 115 hexdump("tmp stage 0: ", tmp, DEFAULT_BLK_SZ);
109 break; 116 break;
110 case 1: 117 case 1:
111 118
112 /* 119 /*
113 * Next xor I with our 120 * Next xor I with our secret vector V
114 * encrypt that result 121 * encrypt that result to obtain our
115 * pseudo random data 122 * pseudo random data which we output
116 */ 123 */
117 xor_vectors(ctx->I, ct 124 xor_vectors(ctx->I, ctx->V, tmp, DEFAULT_BLK_SZ);
118 hexdump("tmp stage 1: 125 hexdump("tmp stage 1: ", tmp, DEFAULT_BLK_SZ);
119 output = ctx->rand_dat 126 output = ctx->rand_data;
120 break; 127 break;
121 case 2: 128 case 2:
122 /* 129 /*
123 * First check that we 130 * First check that we didn't produce the same
124 * random data that we 131 * random data that we did last time around through this
125 */ 132 */
126 if (!memcmp(ctx->rand_ 133 if (!memcmp(ctx->rand_data, ctx->last_rand_data,
127 DEFAUL 134 DEFAULT_BLK_SZ)) {
128 if (cont_test) !! 135 if (fips_enabled) {
129 panic( 136 panic("cprng %p Failed repetition check!\n",
130 137 ctx);
131 } 138 }
132 139
133 printk(KERN_ER 140 printk(KERN_ERR
134 "ctx % 141 "ctx %p Failed repetition check!\n",
135 ctx); 142 ctx);
136 143
137 ctx->flags |= 144 ctx->flags |= PRNG_NEED_RESET;
138 return -EINVAL 145 return -EINVAL;
139 } 146 }
140 memcpy(ctx->last_rand_ 147 memcpy(ctx->last_rand_data, ctx->rand_data,
141 DEFAULT_BLK_SZ 148 DEFAULT_BLK_SZ);
142 149
143 /* 150 /*
144 * Lastly xor the rand 151 * Lastly xor the random data with I
145 * and encrypt that to 152 * and encrypt that to obtain a new secret vector V
146 */ 153 */
147 xor_vectors(ctx->rand_ 154 xor_vectors(ctx->rand_data, ctx->I, tmp,
148 DEFAULT_BLK_SZ 155 DEFAULT_BLK_SZ);
149 output = ctx->V; 156 output = ctx->V;
150 hexdump("tmp stage 2: 157 hexdump("tmp stage 2: ", tmp, DEFAULT_BLK_SZ);
151 break; 158 break;
152 } 159 }
153 160
154 161
155 /* do the encryption */ 162 /* do the encryption */
156 crypto_cipher_encrypt_one(ctx- 163 crypto_cipher_encrypt_one(ctx->tfm, output, tmp);
157 164
158 } 165 }
159 166
160 /* 167 /*
161 * Now update our DT value 168 * Now update our DT value
162 */ 169 */
163 for (i = DEFAULT_BLK_SZ - 1; i >= 0; i 170 for (i = DEFAULT_BLK_SZ - 1; i >= 0; i--) {
164 ctx->DT[i] += 1; 171 ctx->DT[i] += 1;
165 if (ctx->DT[i] != 0) 172 if (ctx->DT[i] != 0)
166 break; 173 break;
167 } 174 }
168 175
169 dbgprint("Returning new block for cont 176 dbgprint("Returning new block for context %p\n", ctx);
170 ctx->rand_data_valid = 0; 177 ctx->rand_data_valid = 0;
171 178
172 hexdump("Output DT: ", ctx->DT, DEFAUL 179 hexdump("Output DT: ", ctx->DT, DEFAULT_BLK_SZ);
173 hexdump("Output I: ", ctx->I, DEFAULT_ 180 hexdump("Output I: ", ctx->I, DEFAULT_BLK_SZ);
174 hexdump("Output V: ", ctx->V, DEFAULT_ 181 hexdump("Output V: ", ctx->V, DEFAULT_BLK_SZ);
175 hexdump("New Random Data: ", ctx->rand 182 hexdump("New Random Data: ", ctx->rand_data, DEFAULT_BLK_SZ);
176 183
177 return 0; 184 return 0;
178 } 185 }
179 186
180 /* Our exported functions */ 187 /* Our exported functions */
181 static int get_prng_bytes(char *buf, size_t nb !! 188 static int get_prng_bytes(char *buf, size_t nbytes, struct prng_context *ctx)
182 int do_cont_te <<
183 { 189 {
184 unsigned char *ptr = buf; 190 unsigned char *ptr = buf;
185 unsigned int byte_count = (unsigned in 191 unsigned int byte_count = (unsigned int)nbytes;
186 int err; 192 int err;
187 193
188 194
>> 195 if (nbytes < 0)
>> 196 return -EINVAL;
>> 197
189 spin_lock_bh(&ctx->prng_lock); 198 spin_lock_bh(&ctx->prng_lock);
190 199
191 err = -EINVAL; 200 err = -EINVAL;
192 if (ctx->flags & PRNG_NEED_RESET) 201 if (ctx->flags & PRNG_NEED_RESET)
193 goto done; 202 goto done;
194 203
195 /* 204 /*
196 * If the FIXED_SIZE flag is on, only 205 * If the FIXED_SIZE flag is on, only return whole blocks of
197 * pseudo random data 206 * pseudo random data
198 */ 207 */
199 err = -EINVAL; 208 err = -EINVAL;
200 if (ctx->flags & PRNG_FIXED_SIZE) { 209 if (ctx->flags & PRNG_FIXED_SIZE) {
201 if (nbytes < DEFAULT_BLK_SZ) 210 if (nbytes < DEFAULT_BLK_SZ)
202 goto done; 211 goto done;
203 byte_count = DEFAULT_BLK_SZ; 212 byte_count = DEFAULT_BLK_SZ;
204 } 213 }
205 214
206 /* !! 215 err = byte_count;
207 * Return 0 in case of success as mand <<
208 * crypto API interface definition. <<
209 */ <<
210 err = 0; <<
211 216
212 dbgprint(KERN_CRIT "getting %d random 217 dbgprint(KERN_CRIT "getting %d random bytes for context %p\n",
213 byte_count, ctx); 218 byte_count, ctx);
214 219
215 220
216 remainder: 221 remainder:
217 if (ctx->rand_data_valid == DEFAULT_BL 222 if (ctx->rand_data_valid == DEFAULT_BLK_SZ) {
218 if (_get_more_prng_bytes(ctx, !! 223 if (_get_more_prng_bytes(ctx) < 0) {
219 memset(buf, 0, nbytes) 224 memset(buf, 0, nbytes);
220 err = -EINVAL; 225 err = -EINVAL;
221 goto done; 226 goto done;
222 } 227 }
223 } 228 }
224 229
225 /* 230 /*
226 * Copy any data less than an entire b 231 * Copy any data less than an entire block
227 */ 232 */
228 if (byte_count < DEFAULT_BLK_SZ) { 233 if (byte_count < DEFAULT_BLK_SZ) {
229 empty_rbuf: 234 empty_rbuf:
230 while (ctx->rand_data_valid < 235 while (ctx->rand_data_valid < DEFAULT_BLK_SZ) {
231 *ptr = ctx->rand_data[ 236 *ptr = ctx->rand_data[ctx->rand_data_valid];
232 ptr++; 237 ptr++;
233 byte_count--; 238 byte_count--;
234 ctx->rand_data_valid++ 239 ctx->rand_data_valid++;
235 if (byte_count == 0) 240 if (byte_count == 0)
236 goto done; 241 goto done;
237 } 242 }
238 } 243 }
239 244
240 /* 245 /*
241 * Now copy whole blocks 246 * Now copy whole blocks
242 */ 247 */
243 for (; byte_count >= DEFAULT_BLK_SZ; b 248 for (; byte_count >= DEFAULT_BLK_SZ; byte_count -= DEFAULT_BLK_SZ) {
244 if (ctx->rand_data_valid == DE 249 if (ctx->rand_data_valid == DEFAULT_BLK_SZ) {
245 if (_get_more_prng_byt !! 250 if (_get_more_prng_bytes(ctx) < 0) {
246 memset(buf, 0, 251 memset(buf, 0, nbytes);
247 err = -EINVAL; 252 err = -EINVAL;
248 goto done; 253 goto done;
249 } 254 }
250 } 255 }
251 if (ctx->rand_data_valid > 0) 256 if (ctx->rand_data_valid > 0)
252 goto empty_rbuf; 257 goto empty_rbuf;
253 memcpy(ptr, ctx->rand_data, DE 258 memcpy(ptr, ctx->rand_data, DEFAULT_BLK_SZ);
254 ctx->rand_data_valid += DEFAUL 259 ctx->rand_data_valid += DEFAULT_BLK_SZ;
255 ptr += DEFAULT_BLK_SZ; 260 ptr += DEFAULT_BLK_SZ;
256 } 261 }
257 262
258 /* 263 /*
259 * Now go back and get any remaining p 264 * Now go back and get any remaining partial block
260 */ 265 */
261 if (byte_count) 266 if (byte_count)
262 goto remainder; 267 goto remainder;
263 268
264 done: 269 done:
265 spin_unlock_bh(&ctx->prng_lock); 270 spin_unlock_bh(&ctx->prng_lock);
266 dbgprint(KERN_CRIT "returning %d from 271 dbgprint(KERN_CRIT "returning %d from get_prng_bytes in context %p\n",
267 err, ctx); 272 err, ctx);
268 return err; 273 return err;
269 } 274 }
270 275
271 static void free_prng_context(struct prng_cont 276 static void free_prng_context(struct prng_context *ctx)
272 { 277 {
273 crypto_free_cipher(ctx->tfm); 278 crypto_free_cipher(ctx->tfm);
274 } 279 }
275 280
276 static int reset_prng_context(struct prng_cont 281 static int reset_prng_context(struct prng_context *ctx,
277 const unsigned c !! 282 unsigned char *key, size_t klen,
278 const unsigned c !! 283 unsigned char *V, unsigned char *DT)
279 { 284 {
280 int ret; 285 int ret;
281 const unsigned char *prng_key; !! 286 unsigned char *prng_key;
282 287
283 spin_lock_bh(&ctx->prng_lock); 288 spin_lock_bh(&ctx->prng_lock);
284 ctx->flags |= PRNG_NEED_RESET; 289 ctx->flags |= PRNG_NEED_RESET;
285 290
286 prng_key = (key != NULL) ? key : (unsi 291 prng_key = (key != NULL) ? key : (unsigned char *)DEFAULT_PRNG_KEY;
287 292
288 if (!key) 293 if (!key)
289 klen = DEFAULT_PRNG_KSZ; 294 klen = DEFAULT_PRNG_KSZ;
290 295
291 if (V) 296 if (V)
292 memcpy(ctx->V, V, DEFAULT_BLK_ 297 memcpy(ctx->V, V, DEFAULT_BLK_SZ);
293 else 298 else
294 memcpy(ctx->V, DEFAULT_V_SEED, 299 memcpy(ctx->V, DEFAULT_V_SEED, DEFAULT_BLK_SZ);
295 300
296 if (DT) 301 if (DT)
297 memcpy(ctx->DT, DT, DEFAULT_BL 302 memcpy(ctx->DT, DT, DEFAULT_BLK_SZ);
298 else 303 else
299 memset(ctx->DT, 0, DEFAULT_BLK 304 memset(ctx->DT, 0, DEFAULT_BLK_SZ);
300 305
301 memset(ctx->rand_data, 0, DEFAULT_BLK_ 306 memset(ctx->rand_data, 0, DEFAULT_BLK_SZ);
302 memset(ctx->last_rand_data, 0, DEFAULT 307 memset(ctx->last_rand_data, 0, DEFAULT_BLK_SZ);
303 308
304 ctx->rand_data_valid = DEFAULT_BLK_SZ; 309 ctx->rand_data_valid = DEFAULT_BLK_SZ;
305 310
306 ret = crypto_cipher_setkey(ctx->tfm, p 311 ret = crypto_cipher_setkey(ctx->tfm, prng_key, klen);
307 if (ret) { 312 if (ret) {
308 dbgprint(KERN_CRIT "PRNG: setk 313 dbgprint(KERN_CRIT "PRNG: setkey() failed flags=%x\n",
309 crypto_cipher_get_flag 314 crypto_cipher_get_flags(ctx->tfm));
310 goto out; 315 goto out;
311 } 316 }
312 317
313 ret = 0; 318 ret = 0;
314 ctx->flags &= ~PRNG_NEED_RESET; 319 ctx->flags &= ~PRNG_NEED_RESET;
315 out: 320 out:
316 spin_unlock_bh(&ctx->prng_lock); 321 spin_unlock_bh(&ctx->prng_lock);
317 return ret; 322 return ret;
318 } 323 }
319 324
320 static int cprng_init(struct crypto_tfm *tfm) 325 static int cprng_init(struct crypto_tfm *tfm)
321 { 326 {
322 struct prng_context *ctx = crypto_tfm_ 327 struct prng_context *ctx = crypto_tfm_ctx(tfm);
323 328
324 spin_lock_init(&ctx->prng_lock); 329 spin_lock_init(&ctx->prng_lock);
325 ctx->tfm = crypto_alloc_cipher("aes", 330 ctx->tfm = crypto_alloc_cipher("aes", 0, 0);
326 if (IS_ERR(ctx->tfm)) { 331 if (IS_ERR(ctx->tfm)) {
327 dbgprint(KERN_CRIT "Failed to 332 dbgprint(KERN_CRIT "Failed to alloc tfm for context %p\n",
328 ctx); 333 ctx);
329 return PTR_ERR(ctx->tfm); 334 return PTR_ERR(ctx->tfm);
330 } 335 }
331 336
332 if (reset_prng_context(ctx, NULL, DEFA 337 if (reset_prng_context(ctx, NULL, DEFAULT_PRNG_KSZ, NULL, NULL) < 0)
333 return -EINVAL; 338 return -EINVAL;
334 339
335 /* 340 /*
336 * after allocation, we should always 341 * after allocation, we should always force the user to reset
337 * so they don't inadvertently use the 342 * so they don't inadvertently use the insecure default values
338 * without specifying them intentially 343 * without specifying them intentially
339 */ 344 */
340 ctx->flags |= PRNG_NEED_RESET; 345 ctx->flags |= PRNG_NEED_RESET;
341 return 0; 346 return 0;
342 } 347 }
343 348
344 static void cprng_exit(struct crypto_tfm *tfm) 349 static void cprng_exit(struct crypto_tfm *tfm)
345 { 350 {
346 free_prng_context(crypto_tfm_ctx(tfm)) 351 free_prng_context(crypto_tfm_ctx(tfm));
347 } 352 }
348 353
349 static int cprng_get_random(struct crypto_rng !! 354 static int cprng_get_random(struct crypto_rng *tfm, u8 *rdata,
350 const u8 *src, uns !! 355 unsigned int dlen)
351 u8 *rdata, unsigne <<
352 { 356 {
353 struct prng_context *prng = crypto_rng 357 struct prng_context *prng = crypto_rng_ctx(tfm);
354 358
355 return get_prng_bytes(rdata, dlen, prn !! 359 return get_prng_bytes(rdata, dlen, prng);
356 } 360 }
357 361
358 /* 362 /*
359 * This is the cprng_registered reset method 363 * This is the cprng_registered reset method the seed value is
360 * interpreted as the tuple { V KEY DT} 364 * interpreted as the tuple { V KEY DT}
361 * V and KEY are required during reset, and D 365 * V and KEY are required during reset, and DT is optional, detected
362 * as being present by testing the length of 366 * as being present by testing the length of the seed
363 */ 367 */
364 static int cprng_reset(struct crypto_rng *tfm, !! 368 static int cprng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
365 const u8 *seed, unsigne <<
366 { 369 {
367 struct prng_context *prng = crypto_rng 370 struct prng_context *prng = crypto_rng_ctx(tfm);
368 const u8 *key = seed + DEFAULT_BLK_SZ; !! 371 u8 *key = seed + DEFAULT_BLK_SZ;
369 const u8 *dt = NULL; !! 372 u8 *dt = NULL;
370 373
371 if (slen < DEFAULT_PRNG_KSZ + DEFAULT_ 374 if (slen < DEFAULT_PRNG_KSZ + DEFAULT_BLK_SZ)
372 return -EINVAL; 375 return -EINVAL;
373 376
374 if (slen >= (2 * DEFAULT_BLK_SZ + DEFA 377 if (slen >= (2 * DEFAULT_BLK_SZ + DEFAULT_PRNG_KSZ))
375 dt = key + DEFAULT_PRNG_KSZ; 378 dt = key + DEFAULT_PRNG_KSZ;
376 379
377 reset_prng_context(prng, key, DEFAULT_ 380 reset_prng_context(prng, key, DEFAULT_PRNG_KSZ, seed, dt);
378 381
379 if (prng->flags & PRNG_NEED_RESET) 382 if (prng->flags & PRNG_NEED_RESET)
380 return -EINVAL; 383 return -EINVAL;
381 return 0; 384 return 0;
382 } 385 }
383 386
384 #ifdef CONFIG_CRYPTO_FIPS !! 387 static struct crypto_alg rng_alg = {
385 static int fips_cprng_get_random(struct crypto !! 388 .cra_name = "stdrng",
386 const u8 *src !! 389 .cra_driver_name = "ansi_cprng",
387 u8 *rdata, un !! 390 .cra_priority = 100,
388 { !! 391 .cra_flags = CRYPTO_ALG_TYPE_RNG,
389 struct prng_context *prng = crypto_rng !! 392 .cra_ctxsize = sizeof(struct prng_context),
390 !! 393 .cra_type = &crypto_rng_type,
391 return get_prng_bytes(rdata, dlen, prn !! 394 .cra_module = THIS_MODULE,
392 } !! 395 .cra_list = LIST_HEAD_INIT(rng_alg.cra_list),
393 !! 396 .cra_init = cprng_init,
394 static int fips_cprng_reset(struct crypto_rng !! 397 .cra_exit = cprng_exit,
395 const u8 *seed, un !! 398 .cra_u = {
396 { !! 399 .rng = {
397 u8 rdata[DEFAULT_BLK_SZ]; !! 400 .rng_make_random = cprng_get_random,
398 const u8 *key = seed + DEFAULT_BLK_SZ; !! 401 .rng_reset = cprng_reset,
399 int rc; !! 402 .seedsize = DEFAULT_PRNG_KSZ + 2*DEFAULT_BLK_SZ,
400 !! 403 }
401 struct prng_context *prng = crypto_rng <<
402 <<
403 if (slen < DEFAULT_PRNG_KSZ + DEFAULT_ <<
404 return -EINVAL; <<
405 <<
406 /* fips strictly requires seed != key <<
407 if (!memcmp(seed, key, DEFAULT_PRNG_KS <<
408 return -EINVAL; <<
409 <<
410 rc = cprng_reset(tfm, seed, slen); <<
411 <<
412 if (!rc) <<
413 goto out; <<
414 <<
415 /* this primes our continuity test */ <<
416 rc = get_prng_bytes(rdata, DEFAULT_BLK <<
417 prng->rand_data_valid = DEFAULT_BLK_SZ <<
418 <<
419 out: <<
420 return rc; <<
421 } <<
422 #endif <<
423 <<
424 static struct rng_alg rng_algs[] = { { <<
425 .generate = cprng_get_ra <<
426 .seed = cprng_reset, <<
427 .seedsize = DEFAULT_PRNG <<
428 .base = { <<
429 .cra_name = "std <<
430 .cra_driver_name = "ans <<
431 .cra_priority = 100, <<
432 .cra_ctxsize = size <<
433 .cra_module = THIS <<
434 .cra_init = cprn <<
435 .cra_exit = cprn <<
436 } <<
437 #ifdef CONFIG_CRYPTO_FIPS <<
438 }, { <<
439 .generate = fips_cprng_g <<
440 .seed = fips_cprng_r <<
441 .seedsize = DEFAULT_PRNG <<
442 .base = { <<
443 .cra_name = "fip <<
444 .cra_driver_name = "fip <<
445 .cra_priority = 300, <<
446 .cra_ctxsize = size <<
447 .cra_module = THIS <<
448 .cra_init = cprn <<
449 .cra_exit = cprn <<
450 } 404 }
451 #endif !! 405 };
452 } }; !! 406
453 407
454 /* Module initalization */ 408 /* Module initalization */
455 static int __init prng_mod_init(void) 409 static int __init prng_mod_init(void)
456 { 410 {
457 return crypto_register_rngs(rng_algs, !! 411 if (fips_enabled)
>> 412 rng_alg.cra_priority += 200;
>> 413
>> 414 return crypto_register_alg(&rng_alg);
458 } 415 }
459 416
460 static void __exit prng_mod_fini(void) 417 static void __exit prng_mod_fini(void)
461 { 418 {
462 crypto_unregister_rngs(rng_algs, ARRAY !! 419 crypto_unregister_alg(&rng_alg);
>> 420 return;
463 } 421 }
464 422
465 MODULE_LICENSE("GPL"); 423 MODULE_LICENSE("GPL");
466 MODULE_DESCRIPTION("Software Pseudo Random Num 424 MODULE_DESCRIPTION("Software Pseudo Random Number Generator");
467 MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver. 425 MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>");
468 module_param(dbg, int, 0); 426 module_param(dbg, int, 0);
469 MODULE_PARM_DESC(dbg, "Boolean to enable debug 427 MODULE_PARM_DESC(dbg, "Boolean to enable debugging (0/1 == off/on)");
470 subsys_initcall(prng_mod_init); !! 428 module_init(prng_mod_init);
471 module_exit(prng_mod_fini); 429 module_exit(prng_mod_fini);
472 MODULE_ALIAS_CRYPTO("stdrng"); !! 430 MODULE_ALIAS("stdrng");
473 MODULE_ALIAS_CRYPTO("ansi_cprng"); <<
474 MODULE_IMPORT_NS(CRYPTO_INTERNAL); <<
475 431
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