diff options
Diffstat (limited to 'crypto/evp/evp_rand.c')
-rw-r--r-- | crypto/evp/evp_rand.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/crypto/evp/evp_rand.c b/crypto/evp/evp_rand.c index ecfc876cda..50334042a9 100644 --- a/crypto/evp/evp_rand.c +++ b/crypto/evp/evp_rand.c @@ -46,6 +46,8 @@ struct evp_rand_st { OSSL_FUNC_rand_get_ctx_params_fn *get_ctx_params; OSSL_FUNC_rand_set_ctx_params_fn *set_ctx_params; OSSL_FUNC_rand_verify_zeroization_fn *verify_zeroization; + OSSL_FUNC_rand_get_seed_fn *get_seed; + OSSL_FUNC_rand_clear_seed_fn *clear_seed; } /* EVP_RAND */ ; static int evp_rand_up_ref(void *vrand) @@ -236,6 +238,16 @@ static void *evp_rand_from_algorithm(int name_id, fnzeroizecnt++; #endif break; + case OSSL_FUNC_RAND_GET_SEED: + if (rand->get_seed != NULL) + break; + rand->get_seed = OSSL_FUNC_rand_get_seed(fns); + break; + case OSSL_FUNC_RAND_CLEAR_SEED: + if (rand->clear_seed != NULL) + break; + rand->clear_seed = OSSL_FUNC_rand_clear_seed(fns); + break; } } /* @@ -680,3 +692,59 @@ int EVP_RAND_verify_zeroization(EVP_RAND_CTX *ctx) evp_rand_unlock(ctx); return res; } + +int evp_rand_can_seed(EVP_RAND_CTX *ctx) +{ + return ctx->meth->get_seed != NULL; +} + +static size_t evp_rand_get_seed_locked(EVP_RAND_CTX *ctx, + unsigned char **buffer, + int entropy, + size_t min_len, size_t max_len, + int prediction_resistance, + const unsigned char *adin, + size_t adin_len) +{ + if (ctx->meth->get_seed != NULL) + return ctx->meth->get_seed(ctx->algctx, buffer, + entropy, min_len, max_len, + prediction_resistance, + adin, adin_len); + return 0; +} + +size_t evp_rand_get_seed(EVP_RAND_CTX *ctx, + unsigned char **buffer, + int entropy, size_t min_len, size_t max_len, + int prediction_resistance, + const unsigned char *adin, size_t adin_len) +{ + int res; + + if (!evp_rand_lock(ctx)) + return 0; + res = evp_rand_get_seed_locked(ctx, + buffer, + entropy, min_len, max_len, + prediction_resistance, + adin, adin_len); + evp_rand_unlock(ctx); + return res; +} + +static void evp_rand_clear_seed_locked(EVP_RAND_CTX *ctx, + unsigned char *buffer, size_t b_len) +{ + if (ctx->meth->clear_seed != NULL) + ctx->meth->clear_seed(ctx->algctx, buffer, b_len); +} + +void evp_rand_clear_seed(EVP_RAND_CTX *ctx, + unsigned char *buffer, size_t b_len) +{ + if (!evp_rand_lock(ctx)) + return; + evp_rand_clear_seed_locked(ctx, buffer, b_len); + evp_rand_unlock(ctx); +} |