/*
- * Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
*/
#include <string.h>
+#include <stdlib.h>
#include <openssl/core_dispatch.h>
#include <openssl/e_os2.h>
#include <openssl/params.h>
static OSSL_FUNC_rand_enable_locking_fn test_rng_enable_locking;
static OSSL_FUNC_rand_lock_fn test_rng_lock;
static OSSL_FUNC_rand_unlock_fn test_rng_unlock;
+static OSSL_FUNC_rand_get_seed_fn test_rng_get_seed;
typedef struct {
void *provctx;
+ unsigned int generate;
int state;
unsigned int strength;
size_t max_request;
unsigned char *entropy, *nonce;
size_t entropy_len, entropy_pos, nonce_len;
CRYPTO_RWLOCK *lock;
+ uint32_t seed;
} PROV_TEST_RNG;
static void *test_rng_new(void *provctx, void *parent,
{
PROV_TEST_RNG *t;
- if (parent != NULL)
- return NULL;
-
t = OPENSSL_zalloc(sizeof(*t));
if (t == NULL)
return NULL;
static int test_rng_instantiate(void *vtest, unsigned int strength,
int prediction_resistance,
- const unsigned char *pstr, size_t pstr_len)
+ const unsigned char *pstr, size_t pstr_len,
+ const OSSL_PARAM params[])
{
PROV_TEST_RNG *t = (PROV_TEST_RNG *)vtest;
- if (strength > t->strength)
+ if (!test_rng_set_ctx_params(t, params) || strength > t->strength)
return 0;
t->state = EVP_RAND_STATE_READY;
t->entropy_pos = 0;
+ t->seed = 221953166; /* Value doesn't matter, so long as it isn't zero */
return 1;
}
PROV_TEST_RNG *t = (PROV_TEST_RNG *)vtest;
t->entropy_pos = 0;
+ t->state = EVP_RAND_STATE_UNINITIALISED;
return 1;
}
+static unsigned char gen_byte(PROV_TEST_RNG *t)
+{
+ uint32_t n;
+
+ /*
+ * Implement the 32 bit xorshift as suggested by George Marsaglia in:
+ * https://doi.org/10.18637/jss.v008.i14
+ *
+ * This is a very fast PRNG so there is no need to extract bytes one at a
+ * time and use the entire value each time.
+ */
+ n = t->seed;
+ n ^= n << 13;
+ n ^= n >> 17;
+ n ^= n << 5;
+ t->seed = n;
+
+ return n & 0xff;
+}
+
static int test_rng_generate(void *vtest, unsigned char *out, size_t outlen,
unsigned int strength, int prediction_resistance,
const unsigned char *adin, size_t adin_len)
if (strength > t->strength)
return 0;
+ if (t->generate) {
+ for (i = 0; i < outlen; i++)
+ out[i] = gen_byte(t);
+ } else {
+ if (t->entropy_len - t->entropy_pos < outlen)
+ return 0;
- for (i = 0; i < outlen; i++) {
- out[i] = t->entropy[t->entropy_pos++];
- if (t->entropy_pos >= t->entropy_len)
- break;
+ memcpy(out, t->entropy + t->entropy_pos, outlen);
+ t->entropy_pos += outlen;
}
return 1;
}
}
static size_t test_rng_nonce(void *vtest, unsigned char *out,
- unsigned int strength,
- ossl_unused size_t min_noncelen,
+ unsigned int strength, size_t min_noncelen,
ossl_unused size_t max_noncelen)
{
PROV_TEST_RNG *t = (PROV_TEST_RNG *)vtest;
+ size_t i;
- if (t->nonce == NULL || strength > t->strength)
+ if (strength > t->strength)
return 0;
+ if (t->generate) {
+ for (i = 0; i < min_noncelen; i++)
+ out[i] = gen_byte(t);
+ return min_noncelen;
+ }
+
+ if (t->nonce == NULL)
+ return 0;
if (out != NULL)
memcpy(out, t->nonce, t->nonce_len);
return t->nonce_len;
p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_MAX_REQUEST);
if (p != NULL && !OSSL_PARAM_set_size_t(p, t->max_request))
return 0;
+
+ p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_GENERATE);
+ if (p != NULL && OSSL_PARAM_set_uint(p, t->generate))
+ return 0;
return 1;
}
-static const OSSL_PARAM *test_rng_gettable_ctx_params(ossl_unused void *provctx)
+static const OSSL_PARAM *test_rng_gettable_ctx_params(ossl_unused void *vtest,
+ ossl_unused void *provctx)
{
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_int(OSSL_RAND_PARAM_STATE, NULL),
OSSL_PARAM_uint(OSSL_RAND_PARAM_STRENGTH, NULL),
OSSL_PARAM_size_t(OSSL_RAND_PARAM_MAX_REQUEST, NULL),
+ OSSL_PARAM_uint(OSSL_RAND_PARAM_GENERATE, NULL),
OSSL_PARAM_END
};
return known_gettable_ctx_params;
void *ptr = NULL;
size_t size = 0;
+ if (params == NULL)
+ return 1;
+
p = OSSL_PARAM_locate_const(params, OSSL_RAND_PARAM_STRENGTH);
if (p != NULL && !OSSL_PARAM_get_uint(p, &t->strength))
return 0;
}
p = OSSL_PARAM_locate_const(params, OSSL_RAND_PARAM_MAX_REQUEST);
- if (p != NULL && !OSSL_PARAM_get_size_t(p, &t->max_request))
+ if (p != NULL && !OSSL_PARAM_get_size_t(p, &t->max_request))
return 0;
+ p = OSSL_PARAM_locate_const(params, OSSL_RAND_PARAM_GENERATE);
+ if (p != NULL && !OSSL_PARAM_get_uint(p, &t->generate))
+ return 0;
return 1;
}
-static const OSSL_PARAM *test_rng_settable_ctx_params(ossl_unused void *provctx)
+static const OSSL_PARAM *test_rng_settable_ctx_params(ossl_unused void *vtest,
+ ossl_unused void *provctx)
{
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_octet_string(OSSL_RAND_PARAM_TEST_ENTROPY, NULL, 0),
OSSL_PARAM_octet_string(OSSL_RAND_PARAM_TEST_NONCE, NULL, 0),
OSSL_PARAM_uint(OSSL_RAND_PARAM_STRENGTH, NULL),
OSSL_PARAM_size_t(OSSL_RAND_PARAM_MAX_REQUEST, NULL),
+ OSSL_PARAM_uint(OSSL_RAND_PARAM_GENERATE, NULL),
OSSL_PARAM_END
};
return known_settable_ctx_params;
return 1;
}
+static size_t test_rng_get_seed(void *vtest, unsigned char **pout,
+ int entropy, size_t min_len, size_t max_len,
+ ossl_unused int prediction_resistance,
+ ossl_unused const unsigned char *adin,
+ ossl_unused size_t adin_len)
+{
+ PROV_TEST_RNG *t = (PROV_TEST_RNG *)vtest;
+
+ *pout = t->entropy;
+ return t->entropy_len > max_len ? max_len : t->entropy_len;
+}
+
static int test_rng_enable_locking(void *vtest)
{
PROV_TEST_RNG *t = (PROV_TEST_RNG *)vtest;
{ OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))test_rng_get_ctx_params },
{ OSSL_FUNC_RAND_VERIFY_ZEROIZATION,
(void(*)(void))test_rng_verify_zeroization },
- { 0, NULL }
+ { OSSL_FUNC_RAND_GET_SEED, (void(*)(void))test_rng_get_seed },
+ OSSL_DISPATCH_END
};
projects / openssl.git / blobdiff