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
18 #define DEFAULT_PRNG_KEY "0123456789abcdef" 23 #define DEFAULT_PRNG_KEY "0123456789abcdef"
19 #define DEFAULT_PRNG_KSZ 16 24 #define DEFAULT_PRNG_KSZ 16
20 #define DEFAULT_BLK_SZ 16 25 #define DEFAULT_BLK_SZ 16
21 #define DEFAULT_V_SEED "zaybxcwdveuftgsh" 26 #define DEFAULT_V_SEED "zaybxcwdveuftgsh"
22 27
23 /* 28 /*
24 * Flags for the prng_context flags field 29 * Flags for the prng_context flags field
25 */ 30 */
26 31
27 #define PRNG_FIXED_SIZE 0x1 32 #define PRNG_FIXED_SIZE 0x1
28 #define PRNG_NEED_RESET 0x2 33 #define PRNG_NEED_RESET 0x2
29 34
30 /* 35 /*
31 * Note: DT is our counter value 36 * Note: DT is our counter value
32 * I is our intermediate value 37 * I is our intermediate value
33 * V is our seed vector 38 * V is our seed vector
34 * See http://csrc.nist.gov/groups/STM/cavp/do 39 * See http://csrc.nist.gov/groups/STM/cavp/documents/rng/931rngext.pdf
35 * for implementation details 40 * for implementation details
36 */ 41 */
37 42
38 43
39 struct prng_context { 44 struct prng_context {
40 spinlock_t prng_lock; 45 spinlock_t prng_lock;
41 unsigned char rand_data[DEFAULT_BLK_SZ 46 unsigned char rand_data[DEFAULT_BLK_SZ];
42 unsigned char last_rand_data[DEFAULT_B 47 unsigned char last_rand_data[DEFAULT_BLK_SZ];
43 unsigned char DT[DEFAULT_BLK_SZ]; 48 unsigned char DT[DEFAULT_BLK_SZ];
44 unsigned char I[DEFAULT_BLK_SZ]; 49 unsigned char I[DEFAULT_BLK_SZ];
45 unsigned char V[DEFAULT_BLK_SZ]; 50 unsigned char V[DEFAULT_BLK_SZ];
46 u32 rand_data_valid; 51 u32 rand_data_valid;
47 struct crypto_cipher *tfm; 52 struct crypto_cipher *tfm;
48 u32 flags; 53 u32 flags;
49 }; 54 };
50 55
51 static int dbg; 56 static int dbg;
52 57
53 static void hexdump(char *note, unsigned char 58 static void hexdump(char *note, unsigned char *buf, unsigned int len)
54 { 59 {
55 if (dbg) { 60 if (dbg) {
56 printk(KERN_CRIT "%s", note); 61 printk(KERN_CRIT "%s", note);
57 print_hex_dump(KERN_CONT, "", 62 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_OFFSET,
58 16, 1, 63 16, 1,
59 buf, len, fals 64 buf, len, false);
60 } 65 }
61 } 66 }
62 67
63 #define dbgprint(format, args...) do {\ 68 #define dbgprint(format, args...) do {\
64 if (dbg)\ 69 if (dbg)\
65 printk(format, ##args);\ 70 printk(format, ##args);\
66 } while (0) 71 } while (0)
67 72
68 static void xor_vectors(unsigned char *in1, un 73 static void xor_vectors(unsigned char *in1, unsigned char *in2,
69 unsigned char *out, un 74 unsigned char *out, unsigned int size)
70 { 75 {
71 int i; 76 int i;
72 77
73 for (i = 0; i < size; i++) 78 for (i = 0; i < size; i++)
74 out[i] = in1[i] ^ in2[i]; 79 out[i] = in1[i] ^ in2[i];
75 80
76 } 81 }
77 /* 82 /*
78 * Returns DEFAULT_BLK_SZ bytes of random data 83 * Returns DEFAULT_BLK_SZ bytes of random data per call
79 * returns 0 if generation succeeded, <0 if so 84 * returns 0 if generation succeeded, <0 if something went wrong
80 */ 85 */
81 static int _get_more_prng_bytes(struct prng_co 86 static int _get_more_prng_bytes(struct prng_context *ctx, int cont_test)
82 { 87 {
83 int i; 88 int i;
84 unsigned char tmp[DEFAULT_BLK_SZ]; 89 unsigned char tmp[DEFAULT_BLK_SZ];
85 unsigned char *output = NULL; 90 unsigned char *output = NULL;
86 91
87 92
88 dbgprint(KERN_CRIT "Calling _get_more_ 93 dbgprint(KERN_CRIT "Calling _get_more_prng_bytes for context %p\n",
89 ctx); 94 ctx);
90 95
91 hexdump("Input DT: ", ctx->DT, DEFAULT 96 hexdump("Input DT: ", ctx->DT, DEFAULT_BLK_SZ);
92 hexdump("Input I: ", ctx->I, DEFAULT_B 97 hexdump("Input I: ", ctx->I, DEFAULT_BLK_SZ);
93 hexdump("Input V: ", ctx->V, DEFAULT_B 98 hexdump("Input V: ", ctx->V, DEFAULT_BLK_SZ);
94 99
95 /* 100 /*
96 * This algorithm is a 3 stage state m 101 * This algorithm is a 3 stage state machine
97 */ 102 */
98 for (i = 0; i < 3; i++) { 103 for (i = 0; i < 3; i++) {
99 104
100 switch (i) { 105 switch (i) {
101 case 0: 106 case 0:
102 /* 107 /*
103 * Start by encrypting 108 * Start by encrypting the counter value
104 * This gives us an in 109 * This gives us an intermediate value I
105 */ 110 */
106 memcpy(tmp, ctx->DT, D 111 memcpy(tmp, ctx->DT, DEFAULT_BLK_SZ);
107 output = ctx->I; 112 output = ctx->I;
108 hexdump("tmp stage 0: 113 hexdump("tmp stage 0: ", tmp, DEFAULT_BLK_SZ);
109 break; 114 break;
110 case 1: 115 case 1:
111 116
112 /* 117 /*
113 * Next xor I with our 118 * Next xor I with our secret vector V
114 * encrypt that result 119 * encrypt that result to obtain our
115 * pseudo random data 120 * pseudo random data which we output
116 */ 121 */
117 xor_vectors(ctx->I, ct 122 xor_vectors(ctx->I, ctx->V, tmp, DEFAULT_BLK_SZ);
118 hexdump("tmp stage 1: 123 hexdump("tmp stage 1: ", tmp, DEFAULT_BLK_SZ);
119 output = ctx->rand_dat 124 output = ctx->rand_data;
120 break; 125 break;
121 case 2: 126 case 2:
122 /* 127 /*
123 * First check that we 128 * First check that we didn't produce the same
124 * random data that we 129 * random data that we did last time around through this
125 */ 130 */
126 if (!memcmp(ctx->rand_ 131 if (!memcmp(ctx->rand_data, ctx->last_rand_data,
127 DEFAUL 132 DEFAULT_BLK_SZ)) {
128 if (cont_test) 133 if (cont_test) {
129 panic( 134 panic("cprng %p Failed repetition check!\n",
130 135 ctx);
131 } 136 }
132 137
133 printk(KERN_ER 138 printk(KERN_ERR
134 "ctx % 139 "ctx %p Failed repetition check!\n",
135 ctx); 140 ctx);
136 141
137 ctx->flags |= 142 ctx->flags |= PRNG_NEED_RESET;
138 return -EINVAL 143 return -EINVAL;
139 } 144 }
140 memcpy(ctx->last_rand_ 145 memcpy(ctx->last_rand_data, ctx->rand_data,
141 DEFAULT_BLK_SZ 146 DEFAULT_BLK_SZ);
142 147
143 /* 148 /*
144 * Lastly xor the rand 149 * Lastly xor the random data with I
145 * and encrypt that to 150 * and encrypt that to obtain a new secret vector V
146 */ 151 */
147 xor_vectors(ctx->rand_ 152 xor_vectors(ctx->rand_data, ctx->I, tmp,
148 DEFAULT_BLK_SZ 153 DEFAULT_BLK_SZ);
149 output = ctx->V; 154 output = ctx->V;
150 hexdump("tmp stage 2: 155 hexdump("tmp stage 2: ", tmp, DEFAULT_BLK_SZ);
151 break; 156 break;
152 } 157 }
153 158
154 159
155 /* do the encryption */ 160 /* do the encryption */
156 crypto_cipher_encrypt_one(ctx- 161 crypto_cipher_encrypt_one(ctx->tfm, output, tmp);
157 162
158 } 163 }
159 164
160 /* 165 /*
161 * Now update our DT value 166 * Now update our DT value
162 */ 167 */
163 for (i = DEFAULT_BLK_SZ - 1; i >= 0; i 168 for (i = DEFAULT_BLK_SZ - 1; i >= 0; i--) {
164 ctx->DT[i] += 1; 169 ctx->DT[i] += 1;
165 if (ctx->DT[i] != 0) 170 if (ctx->DT[i] != 0)
166 break; 171 break;
167 } 172 }
168 173
169 dbgprint("Returning new block for cont 174 dbgprint("Returning new block for context %p\n", ctx);
170 ctx->rand_data_valid = 0; 175 ctx->rand_data_valid = 0;
171 176
172 hexdump("Output DT: ", ctx->DT, DEFAUL 177 hexdump("Output DT: ", ctx->DT, DEFAULT_BLK_SZ);
173 hexdump("Output I: ", ctx->I, DEFAULT_ 178 hexdump("Output I: ", ctx->I, DEFAULT_BLK_SZ);
174 hexdump("Output V: ", ctx->V, DEFAULT_ 179 hexdump("Output V: ", ctx->V, DEFAULT_BLK_SZ);
175 hexdump("New Random Data: ", ctx->rand 180 hexdump("New Random Data: ", ctx->rand_data, DEFAULT_BLK_SZ);
176 181
177 return 0; 182 return 0;
178 } 183 }
179 184
180 /* Our exported functions */ 185 /* Our exported functions */
181 static int get_prng_bytes(char *buf, size_t nb 186 static int get_prng_bytes(char *buf, size_t nbytes, struct prng_context *ctx,
182 int do_cont_te 187 int do_cont_test)
183 { 188 {
184 unsigned char *ptr = buf; 189 unsigned char *ptr = buf;
185 unsigned int byte_count = (unsigned in 190 unsigned int byte_count = (unsigned int)nbytes;
186 int err; 191 int err;
187 192
188 193
189 spin_lock_bh(&ctx->prng_lock); 194 spin_lock_bh(&ctx->prng_lock);
190 195
191 err = -EINVAL; 196 err = -EINVAL;
192 if (ctx->flags & PRNG_NEED_RESET) 197 if (ctx->flags & PRNG_NEED_RESET)
193 goto done; 198 goto done;
194 199
195 /* 200 /*
196 * If the FIXED_SIZE flag is on, only 201 * If the FIXED_SIZE flag is on, only return whole blocks of
197 * pseudo random data 202 * pseudo random data
198 */ 203 */
199 err = -EINVAL; 204 err = -EINVAL;
200 if (ctx->flags & PRNG_FIXED_SIZE) { 205 if (ctx->flags & PRNG_FIXED_SIZE) {
201 if (nbytes < DEFAULT_BLK_SZ) 206 if (nbytes < DEFAULT_BLK_SZ)
202 goto done; 207 goto done;
203 byte_count = DEFAULT_BLK_SZ; 208 byte_count = DEFAULT_BLK_SZ;
204 } 209 }
205 210
206 /* 211 /*
207 * Return 0 in case of success as mand 212 * Return 0 in case of success as mandated by the kernel
208 * crypto API interface definition. 213 * crypto API interface definition.
209 */ 214 */
210 err = 0; 215 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, do_cont_test) < 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, do_cont_test) < 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 const unsigned char *key, size_t klen,
278 const unsigned c 283 const unsigned char *V, const unsigned char *DT)
279 { 284 {
280 int ret; 285 int ret;
281 const unsigned char *prng_key; 286 const 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,
350 const u8 *src, uns 355 const u8 *src, unsigned int slen,
351 u8 *rdata, unsigne 356 u8 *rdata, unsigned int dlen)
352 { 357 {
353 struct prng_context *prng = crypto_rng 358 struct prng_context *prng = crypto_rng_ctx(tfm);
354 359
355 return get_prng_bytes(rdata, dlen, prn 360 return get_prng_bytes(rdata, dlen, prng, 0);
356 } 361 }
357 362
358 /* 363 /*
359 * This is the cprng_registered reset method 364 * This is the cprng_registered reset method the seed value is
360 * interpreted as the tuple { V KEY DT} 365 * interpreted as the tuple { V KEY DT}
361 * V and KEY are required during reset, and D 366 * V and KEY are required during reset, and DT is optional, detected
362 * as being present by testing the length of 367 * as being present by testing the length of the seed
363 */ 368 */
364 static int cprng_reset(struct crypto_rng *tfm, 369 static int cprng_reset(struct crypto_rng *tfm,
365 const u8 *seed, unsigne 370 const u8 *seed, unsigned int slen)
366 { 371 {
367 struct prng_context *prng = crypto_rng 372 struct prng_context *prng = crypto_rng_ctx(tfm);
368 const u8 *key = seed + DEFAULT_BLK_SZ; 373 const u8 *key = seed + DEFAULT_BLK_SZ;
369 const u8 *dt = NULL; 374 const u8 *dt = NULL;
370 375
371 if (slen < DEFAULT_PRNG_KSZ + DEFAULT_ 376 if (slen < DEFAULT_PRNG_KSZ + DEFAULT_BLK_SZ)
372 return -EINVAL; 377 return -EINVAL;
373 378
374 if (slen >= (2 * DEFAULT_BLK_SZ + DEFA 379 if (slen >= (2 * DEFAULT_BLK_SZ + DEFAULT_PRNG_KSZ))
375 dt = key + DEFAULT_PRNG_KSZ; 380 dt = key + DEFAULT_PRNG_KSZ;
376 381
377 reset_prng_context(prng, key, DEFAULT_ 382 reset_prng_context(prng, key, DEFAULT_PRNG_KSZ, seed, dt);
378 383
379 if (prng->flags & PRNG_NEED_RESET) 384 if (prng->flags & PRNG_NEED_RESET)
380 return -EINVAL; 385 return -EINVAL;
381 return 0; 386 return 0;
382 } 387 }
383 388
384 #ifdef CONFIG_CRYPTO_FIPS 389 #ifdef CONFIG_CRYPTO_FIPS
385 static int fips_cprng_get_random(struct crypto 390 static int fips_cprng_get_random(struct crypto_rng *tfm,
386 const u8 *src 391 const u8 *src, unsigned int slen,
387 u8 *rdata, un 392 u8 *rdata, unsigned int dlen)
388 { 393 {
389 struct prng_context *prng = crypto_rng 394 struct prng_context *prng = crypto_rng_ctx(tfm);
390 395
391 return get_prng_bytes(rdata, dlen, prn 396 return get_prng_bytes(rdata, dlen, prng, 1);
392 } 397 }
393 398
394 static int fips_cprng_reset(struct crypto_rng 399 static int fips_cprng_reset(struct crypto_rng *tfm,
395 const u8 *seed, un 400 const u8 *seed, unsigned int slen)
396 { 401 {
397 u8 rdata[DEFAULT_BLK_SZ]; 402 u8 rdata[DEFAULT_BLK_SZ];
398 const u8 *key = seed + DEFAULT_BLK_SZ; 403 const u8 *key = seed + DEFAULT_BLK_SZ;
399 int rc; 404 int rc;
400 405
401 struct prng_context *prng = crypto_rng 406 struct prng_context *prng = crypto_rng_ctx(tfm);
402 407
403 if (slen < DEFAULT_PRNG_KSZ + DEFAULT_ 408 if (slen < DEFAULT_PRNG_KSZ + DEFAULT_BLK_SZ)
404 return -EINVAL; 409 return -EINVAL;
405 410
406 /* fips strictly requires seed != key 411 /* fips strictly requires seed != key */
407 if (!memcmp(seed, key, DEFAULT_PRNG_KS 412 if (!memcmp(seed, key, DEFAULT_PRNG_KSZ))
408 return -EINVAL; 413 return -EINVAL;
409 414
410 rc = cprng_reset(tfm, seed, slen); 415 rc = cprng_reset(tfm, seed, slen);
411 416
412 if (!rc) 417 if (!rc)
413 goto out; 418 goto out;
414 419
415 /* this primes our continuity test */ 420 /* this primes our continuity test */
416 rc = get_prng_bytes(rdata, DEFAULT_BLK 421 rc = get_prng_bytes(rdata, DEFAULT_BLK_SZ, prng, 0);
417 prng->rand_data_valid = DEFAULT_BLK_SZ 422 prng->rand_data_valid = DEFAULT_BLK_SZ;
418 423
419 out: 424 out:
420 return rc; 425 return rc;
421 } 426 }
422 #endif 427 #endif
423 428
424 static struct rng_alg rng_algs[] = { { 429 static struct rng_alg rng_algs[] = { {
425 .generate = cprng_get_ra 430 .generate = cprng_get_random,
426 .seed = cprng_reset, 431 .seed = cprng_reset,
427 .seedsize = DEFAULT_PRNG 432 .seedsize = DEFAULT_PRNG_KSZ + 2 * DEFAULT_BLK_SZ,
428 .base = { 433 .base = {
429 .cra_name = "std 434 .cra_name = "stdrng",
430 .cra_driver_name = "ans 435 .cra_driver_name = "ansi_cprng",
431 .cra_priority = 100, 436 .cra_priority = 100,
432 .cra_ctxsize = size 437 .cra_ctxsize = sizeof(struct prng_context),
433 .cra_module = THIS 438 .cra_module = THIS_MODULE,
434 .cra_init = cprn 439 .cra_init = cprng_init,
435 .cra_exit = cprn 440 .cra_exit = cprng_exit,
436 } 441 }
437 #ifdef CONFIG_CRYPTO_FIPS 442 #ifdef CONFIG_CRYPTO_FIPS
438 }, { 443 }, {
439 .generate = fips_cprng_g 444 .generate = fips_cprng_get_random,
440 .seed = fips_cprng_r 445 .seed = fips_cprng_reset,
441 .seedsize = DEFAULT_PRNG 446 .seedsize = DEFAULT_PRNG_KSZ + 2 * DEFAULT_BLK_SZ,
442 .base = { 447 .base = {
443 .cra_name = "fip 448 .cra_name = "fips(ansi_cprng)",
444 .cra_driver_name = "fip 449 .cra_driver_name = "fips_ansi_cprng",
445 .cra_priority = 300, 450 .cra_priority = 300,
446 .cra_ctxsize = size 451 .cra_ctxsize = sizeof(struct prng_context),
447 .cra_module = THIS 452 .cra_module = THIS_MODULE,
448 .cra_init = cprn 453 .cra_init = cprng_init,
449 .cra_exit = cprn 454 .cra_exit = cprng_exit,
450 } 455 }
451 #endif 456 #endif
452 } }; 457 } };
453 458
454 /* Module initalization */ 459 /* Module initalization */
455 static int __init prng_mod_init(void) 460 static int __init prng_mod_init(void)
456 { 461 {
457 return crypto_register_rngs(rng_algs, 462 return crypto_register_rngs(rng_algs, ARRAY_SIZE(rng_algs));
458 } 463 }
459 464
460 static void __exit prng_mod_fini(void) 465 static void __exit prng_mod_fini(void)
461 { 466 {
462 crypto_unregister_rngs(rng_algs, ARRAY 467 crypto_unregister_rngs(rng_algs, ARRAY_SIZE(rng_algs));
463 } 468 }
464 469
465 MODULE_LICENSE("GPL"); 470 MODULE_LICENSE("GPL");
466 MODULE_DESCRIPTION("Software Pseudo Random Num 471 MODULE_DESCRIPTION("Software Pseudo Random Number Generator");
467 MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver. 472 MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>");
468 module_param(dbg, int, 0); 473 module_param(dbg, int, 0);
469 MODULE_PARM_DESC(dbg, "Boolean to enable debug 474 MODULE_PARM_DESC(dbg, "Boolean to enable debugging (0/1 == off/on)");
470 subsys_initcall(prng_mod_init); !! 475 module_init(prng_mod_init);
471 module_exit(prng_mod_fini); 476 module_exit(prng_mod_fini);
472 MODULE_ALIAS_CRYPTO("stdrng"); 477 MODULE_ALIAS_CRYPTO("stdrng");
473 MODULE_ALIAS_CRYPTO("ansi_cprng"); 478 MODULE_ALIAS_CRYPTO("ansi_cprng");
474 MODULE_IMPORT_NS(CRYPTO_INTERNAL); <<
475 479
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