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