249 lines
7.8 KiB
C
249 lines
7.8 KiB
C
/*
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* Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <string.h>
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#include <openssl/rand.h>
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#include <openssl/core_dispatch.h>
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#include <openssl/e_os2.h>
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#include <openssl/params.h>
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#include <openssl/core_names.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/randerr.h>
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#include <openssl/proverr.h>
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#include "prov/implementations.h"
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#include "prov/provider_ctx.h"
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#include "crypto/rand.h"
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#include "crypto/rand_pool.h"
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static OSSL_FUNC_rand_newctx_fn seed_src_new;
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static OSSL_FUNC_rand_freectx_fn seed_src_free;
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static OSSL_FUNC_rand_instantiate_fn seed_src_instantiate;
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static OSSL_FUNC_rand_uninstantiate_fn seed_src_uninstantiate;
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static OSSL_FUNC_rand_generate_fn seed_src_generate;
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static OSSL_FUNC_rand_reseed_fn seed_src_reseed;
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static OSSL_FUNC_rand_gettable_ctx_params_fn seed_src_gettable_ctx_params;
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static OSSL_FUNC_rand_get_ctx_params_fn seed_src_get_ctx_params;
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static OSSL_FUNC_rand_verify_zeroization_fn seed_src_verify_zeroization;
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static OSSL_FUNC_rand_enable_locking_fn seed_src_enable_locking;
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static OSSL_FUNC_rand_lock_fn seed_src_lock;
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static OSSL_FUNC_rand_unlock_fn seed_src_unlock;
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static OSSL_FUNC_rand_get_seed_fn seed_get_seed;
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static OSSL_FUNC_rand_clear_seed_fn seed_clear_seed;
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typedef struct {
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void *provctx;
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int state;
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} PROV_SEED_SRC;
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static void *seed_src_new(void *provctx, void *parent,
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const OSSL_DISPATCH *parent_dispatch)
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{
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PROV_SEED_SRC *s;
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if (parent != NULL) {
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ERR_raise(ERR_LIB_PROV, PROV_R_SEED_SOURCES_MUST_NOT_HAVE_A_PARENT);
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return NULL;
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}
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s = OPENSSL_zalloc(sizeof(*s));
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if (s == NULL)
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return NULL;
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s->provctx = provctx;
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s->state = EVP_RAND_STATE_UNINITIALISED;
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return s;
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}
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static void seed_src_free(void *vseed)
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{
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OPENSSL_free(vseed);
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}
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static int seed_src_instantiate(void *vseed, unsigned int strength,
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int prediction_resistance,
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const unsigned char *pstr, size_t pstr_len,
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ossl_unused const OSSL_PARAM params[])
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{
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PROV_SEED_SRC *s = (PROV_SEED_SRC *)vseed;
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s->state = EVP_RAND_STATE_READY;
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return 1;
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}
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static int seed_src_uninstantiate(void *vseed)
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{
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PROV_SEED_SRC *s = (PROV_SEED_SRC *)vseed;
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s->state = EVP_RAND_STATE_UNINITIALISED;
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return 1;
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}
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static int seed_src_generate(void *vseed, unsigned char *out, size_t outlen,
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unsigned int strength,
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ossl_unused int prediction_resistance,
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ossl_unused const unsigned char *adin,
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ossl_unused size_t adin_len)
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{
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PROV_SEED_SRC *s = (PROV_SEED_SRC *)vseed;
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size_t entropy_available;
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RAND_POOL *pool;
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if (s->state != EVP_RAND_STATE_READY) {
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ERR_raise(ERR_LIB_PROV,
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s->state == EVP_RAND_STATE_ERROR ? PROV_R_IN_ERROR_STATE
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: PROV_R_NOT_INSTANTIATED);
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return 0;
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}
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pool = ossl_rand_pool_new(strength, 1, outlen, outlen);
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if (pool == NULL) {
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ERR_raise(ERR_LIB_PROV, ERR_R_RAND_LIB);
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return 0;
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}
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/* Get entropy by polling system entropy sources. */
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entropy_available = ossl_pool_acquire_entropy(pool);
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if (entropy_available > 0)
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memcpy(out, ossl_rand_pool_buffer(pool), ossl_rand_pool_length(pool));
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ossl_rand_pool_free(pool);
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return entropy_available > 0;
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}
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static int seed_src_reseed(void *vseed,
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ossl_unused int prediction_resistance,
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ossl_unused const unsigned char *ent,
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ossl_unused size_t ent_len,
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ossl_unused const unsigned char *adin,
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ossl_unused size_t adin_len)
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{
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PROV_SEED_SRC *s = (PROV_SEED_SRC *)vseed;
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if (s->state != EVP_RAND_STATE_READY) {
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ERR_raise(ERR_LIB_PROV,
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s->state == EVP_RAND_STATE_ERROR ? PROV_R_IN_ERROR_STATE
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: PROV_R_NOT_INSTANTIATED);
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return 0;
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}
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return 1;
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}
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static int seed_src_get_ctx_params(void *vseed, OSSL_PARAM params[])
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{
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PROV_SEED_SRC *s = (PROV_SEED_SRC *)vseed;
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OSSL_PARAM *p;
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p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_STATE);
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if (p != NULL && !OSSL_PARAM_set_int(p, s->state))
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return 0;
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p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_STRENGTH);
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if (p != NULL && !OSSL_PARAM_set_int(p, 1024))
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return 0;
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p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_MAX_REQUEST);
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if (p != NULL && !OSSL_PARAM_set_size_t(p, 128))
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return 0;
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return 1;
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}
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static const OSSL_PARAM *seed_src_gettable_ctx_params(ossl_unused void *vseed,
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ossl_unused void *provctx)
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{
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static const OSSL_PARAM known_gettable_ctx_params[] = {
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OSSL_PARAM_int(OSSL_RAND_PARAM_STATE, NULL),
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OSSL_PARAM_uint(OSSL_RAND_PARAM_STRENGTH, NULL),
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OSSL_PARAM_size_t(OSSL_RAND_PARAM_MAX_REQUEST, NULL),
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OSSL_PARAM_END
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};
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return known_gettable_ctx_params;
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}
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static int seed_src_verify_zeroization(ossl_unused void *vseed)
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{
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return 1;
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}
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static size_t seed_get_seed(void *vseed, unsigned char **pout,
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int entropy, size_t min_len, size_t max_len,
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int prediction_resistance,
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const unsigned char *adin, size_t adin_len)
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{
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size_t ret = 0;
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size_t entropy_available = 0;
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size_t i;
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RAND_POOL *pool;
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pool = ossl_rand_pool_new(entropy, 1, min_len, max_len);
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if (pool == NULL) {
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ERR_raise(ERR_LIB_PROV, ERR_R_RAND_LIB);
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return 0;
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}
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/* Get entropy by polling system entropy sources. */
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entropy_available = ossl_pool_acquire_entropy(pool);
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if (entropy_available > 0) {
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ret = ossl_rand_pool_length(pool);
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*pout = ossl_rand_pool_detach(pool);
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/* xor the additional data into the output */
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for (i = 0 ; i < adin_len ; ++i)
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(*pout)[i % ret] ^= adin[i];
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} else {
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ERR_raise(ERR_LIB_PROV, PROV_R_ENTROPY_SOURCE_STRENGTH_TOO_WEAK);
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}
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ossl_rand_pool_free(pool);
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return ret;
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}
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static void seed_clear_seed(ossl_unused void *vdrbg,
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unsigned char *out, size_t outlen)
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{
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OPENSSL_secure_clear_free(out, outlen);
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}
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static int seed_src_enable_locking(ossl_unused void *vseed)
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{
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return 1;
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}
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int seed_src_lock(ossl_unused void *vctx)
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{
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return 1;
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}
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void seed_src_unlock(ossl_unused void *vctx)
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{
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}
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const OSSL_DISPATCH ossl_seed_src_functions[] = {
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{ OSSL_FUNC_RAND_NEWCTX, (void(*)(void))seed_src_new },
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{ OSSL_FUNC_RAND_FREECTX, (void(*)(void))seed_src_free },
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{ OSSL_FUNC_RAND_INSTANTIATE,
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(void(*)(void))seed_src_instantiate },
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{ OSSL_FUNC_RAND_UNINSTANTIATE,
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(void(*)(void))seed_src_uninstantiate },
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{ OSSL_FUNC_RAND_GENERATE, (void(*)(void))seed_src_generate },
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{ OSSL_FUNC_RAND_RESEED, (void(*)(void))seed_src_reseed },
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{ OSSL_FUNC_RAND_ENABLE_LOCKING, (void(*)(void))seed_src_enable_locking },
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{ OSSL_FUNC_RAND_LOCK, (void(*)(void))seed_src_lock },
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{ OSSL_FUNC_RAND_UNLOCK, (void(*)(void))seed_src_unlock },
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{ OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS,
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(void(*)(void))seed_src_gettable_ctx_params },
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{ OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))seed_src_get_ctx_params },
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{ OSSL_FUNC_RAND_VERIFY_ZEROIZATION,
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(void(*)(void))seed_src_verify_zeroization },
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{ OSSL_FUNC_RAND_GET_SEED, (void(*)(void))seed_get_seed },
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{ OSSL_FUNC_RAND_CLEAR_SEED, (void(*)(void))seed_clear_seed },
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OSSL_DISPATCH_END
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};
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