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