Lines Matching refs:ctx
81 static int _get_more_prng_bytes(struct prng_context *ctx, int cont_test) in _get_more_prng_bytes() argument
89 ctx); in _get_more_prng_bytes()
91 hexdump("Input DT: ", ctx->DT, DEFAULT_BLK_SZ); in _get_more_prng_bytes()
92 hexdump("Input I: ", ctx->I, DEFAULT_BLK_SZ); in _get_more_prng_bytes()
93 hexdump("Input V: ", ctx->V, DEFAULT_BLK_SZ); in _get_more_prng_bytes()
106 memcpy(tmp, ctx->DT, DEFAULT_BLK_SZ); in _get_more_prng_bytes()
107 output = ctx->I; in _get_more_prng_bytes()
117 xor_vectors(ctx->I, ctx->V, tmp, DEFAULT_BLK_SZ); in _get_more_prng_bytes()
119 output = ctx->rand_data; in _get_more_prng_bytes()
126 if (!memcmp(ctx->rand_data, ctx->last_rand_data, in _get_more_prng_bytes()
130 ctx); in _get_more_prng_bytes()
135 ctx); in _get_more_prng_bytes()
137 ctx->flags |= PRNG_NEED_RESET; in _get_more_prng_bytes()
140 memcpy(ctx->last_rand_data, ctx->rand_data, in _get_more_prng_bytes()
147 xor_vectors(ctx->rand_data, ctx->I, tmp, in _get_more_prng_bytes()
149 output = ctx->V; in _get_more_prng_bytes()
156 crypto_cipher_encrypt_one(ctx->tfm, output, tmp); in _get_more_prng_bytes()
164 ctx->DT[i] += 1; in _get_more_prng_bytes()
165 if (ctx->DT[i] != 0) in _get_more_prng_bytes()
169 dbgprint("Returning new block for context %p\n", ctx); in _get_more_prng_bytes()
170 ctx->rand_data_valid = 0; in _get_more_prng_bytes()
172 hexdump("Output DT: ", ctx->DT, DEFAULT_BLK_SZ); in _get_more_prng_bytes()
173 hexdump("Output I: ", ctx->I, DEFAULT_BLK_SZ); in _get_more_prng_bytes()
174 hexdump("Output V: ", ctx->V, DEFAULT_BLK_SZ); in _get_more_prng_bytes()
175 hexdump("New Random Data: ", ctx->rand_data, DEFAULT_BLK_SZ); in _get_more_prng_bytes()
181 static int get_prng_bytes(char *buf, size_t nbytes, struct prng_context *ctx, in get_prng_bytes() argument
189 spin_lock_bh(&ctx->prng_lock); in get_prng_bytes()
192 if (ctx->flags & PRNG_NEED_RESET) in get_prng_bytes()
200 if (ctx->flags & PRNG_FIXED_SIZE) { in get_prng_bytes()
213 byte_count, ctx); in get_prng_bytes()
217 if (ctx->rand_data_valid == DEFAULT_BLK_SZ) { in get_prng_bytes()
218 if (_get_more_prng_bytes(ctx, do_cont_test) < 0) { in get_prng_bytes()
230 while (ctx->rand_data_valid < DEFAULT_BLK_SZ) { in get_prng_bytes()
231 *ptr = ctx->rand_data[ctx->rand_data_valid]; in get_prng_bytes()
234 ctx->rand_data_valid++; in get_prng_bytes()
244 if (ctx->rand_data_valid == DEFAULT_BLK_SZ) { in get_prng_bytes()
245 if (_get_more_prng_bytes(ctx, do_cont_test) < 0) { in get_prng_bytes()
251 if (ctx->rand_data_valid > 0) in get_prng_bytes()
253 memcpy(ptr, ctx->rand_data, DEFAULT_BLK_SZ); in get_prng_bytes()
254 ctx->rand_data_valid += DEFAULT_BLK_SZ; in get_prng_bytes()
265 spin_unlock_bh(&ctx->prng_lock); in get_prng_bytes()
267 err, ctx); in get_prng_bytes()
271 static void free_prng_context(struct prng_context *ctx) in free_prng_context() argument
273 crypto_free_cipher(ctx->tfm); in free_prng_context()
276 static int reset_prng_context(struct prng_context *ctx, in reset_prng_context() argument
283 spin_lock_bh(&ctx->prng_lock); in reset_prng_context()
284 ctx->flags |= PRNG_NEED_RESET; in reset_prng_context()
292 memcpy(ctx->V, V, DEFAULT_BLK_SZ); in reset_prng_context()
294 memcpy(ctx->V, DEFAULT_V_SEED, DEFAULT_BLK_SZ); in reset_prng_context()
297 memcpy(ctx->DT, DT, DEFAULT_BLK_SZ); in reset_prng_context()
299 memset(ctx->DT, 0, DEFAULT_BLK_SZ); in reset_prng_context()
301 memset(ctx->rand_data, 0, DEFAULT_BLK_SZ); in reset_prng_context()
302 memset(ctx->last_rand_data, 0, DEFAULT_BLK_SZ); in reset_prng_context()
304 ctx->rand_data_valid = DEFAULT_BLK_SZ; in reset_prng_context()
306 ret = crypto_cipher_setkey(ctx->tfm, prng_key, klen); in reset_prng_context()
309 crypto_cipher_get_flags(ctx->tfm)); in reset_prng_context()
314 ctx->flags &= ~PRNG_NEED_RESET; in reset_prng_context()
316 spin_unlock_bh(&ctx->prng_lock); in reset_prng_context()
322 struct prng_context *ctx = crypto_tfm_ctx(tfm); in cprng_init() local
324 spin_lock_init(&ctx->prng_lock); in cprng_init()
325 ctx->tfm = crypto_alloc_cipher("aes", 0, 0); in cprng_init()
326 if (IS_ERR(ctx->tfm)) { in cprng_init()
328 ctx); in cprng_init()
329 return PTR_ERR(ctx->tfm); in cprng_init()
332 if (reset_prng_context(ctx, NULL, DEFAULT_PRNG_KSZ, NULL, NULL) < 0) in cprng_init()
340 ctx->flags |= PRNG_NEED_RESET; in cprng_init()