1 /* 2 * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <openssl/core_dispatch.h> 11 #include "prov/seeding.h" 12 13 static OSSL_FUNC_get_entropy_fn *c_get_entropy = NULL; 14 static OSSL_FUNC_cleanup_entropy_fn *c_cleanup_entropy = NULL; 15 static OSSL_FUNC_get_nonce_fn *c_get_nonce = NULL; 16 static OSSL_FUNC_cleanup_nonce_fn *c_cleanup_nonce = NULL; 17 18 int ossl_prov_seeding_from_dispatch(const OSSL_DISPATCH *fns) 19 { 20 for (; fns->function_id != 0; fns++) { 21 /* 22 * We do not support the scenario of an application linked against 23 * multiple versions of libcrypto (e.g. one static and one dynamic), but 24 * sharing a single fips.so. We do a simple sanity check here. 25 */ 26 #define set_func(c, f) \ 27 do { if (c == NULL) c = f; else if (c != f) return 0; } while (0) 28 switch (fns->function_id) { 29 case OSSL_FUNC_GET_ENTROPY: 30 set_func(c_get_entropy, OSSL_FUNC_get_entropy(fns)); 31 break; 32 case OSSL_FUNC_CLEANUP_ENTROPY: 33 set_func(c_cleanup_entropy, OSSL_FUNC_cleanup_entropy(fns)); 34 break; 35 case OSSL_FUNC_GET_NONCE: 36 set_func(c_get_nonce, OSSL_FUNC_get_nonce(fns)); 37 break; 38 case OSSL_FUNC_CLEANUP_NONCE: 39 set_func(c_cleanup_nonce, OSSL_FUNC_cleanup_nonce(fns)); 40 break; 41 } 42 #undef set_func 43 } 44 return 1; 45 } 46 47 size_t ossl_prov_get_entropy(PROV_CTX *prov_ctx, unsigned char **pout, 48 int entropy, size_t min_len, size_t max_len) 49 { 50 if (c_get_entropy == NULL) 51 return 0; 52 return c_get_entropy(ossl_prov_ctx_get0_handle(prov_ctx), 53 pout, entropy, min_len, max_len); 54 } 55 56 void ossl_prov_cleanup_entropy(PROV_CTX *prov_ctx, unsigned char *buf, 57 size_t len) 58 { 59 if (c_cleanup_entropy != NULL) 60 c_cleanup_entropy(ossl_prov_ctx_get0_handle(prov_ctx), buf, len); 61 } 62 63 size_t ossl_prov_get_nonce(PROV_CTX *prov_ctx, unsigned char **pout, 64 size_t min_len, size_t max_len, 65 const void *salt,size_t salt_len) 66 { 67 if (c_get_nonce == NULL) 68 return 0; 69 return c_get_nonce(ossl_prov_ctx_get0_handle(prov_ctx), pout, 70 min_len, max_len, salt, salt_len); 71 } 72 73 void ossl_prov_cleanup_nonce(PROV_CTX *prov_ctx, unsigned char *buf, size_t len) 74 { 75 if (c_cleanup_nonce != NULL) 76 c_cleanup_nonce(ossl_prov_ctx_get0_handle(prov_ctx), buf, len); 77 } 78