| /* |
| * Copyright 2021 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 |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <stdio.h> |
| #include <openssl/core_names.h> |
| #include <openssl/crypto.h> |
| #include <openssl/kdf.h> |
| #include <openssl/obj_mac.h> |
| #include <openssl/params.h> |
| |
| /* |
| * test vector from |
| * https://datatracker.ietf.org/doc/html/rfc7914 |
| */ |
| |
| /* |
| * Hard coding a password into an application is very bad. |
| * It is done here solely for educational purposes. |
| */ |
| static unsigned char password[] = { |
| 'P', 'a', 's', 's', 'w', 'o', 'r', 'd' |
| }; |
| |
| /* |
| * The salt is better not being hard coded too. Each password should have a |
| * different salt if possible. The salt is not considered secret information |
| * and is safe to store with an encrypted password. |
| */ |
| static unsigned char pbkdf2_salt[] = { |
| 'N', 'a', 'C', 'l' |
| }; |
| |
| /* |
| * The iteration parameter can be variable or hard coded. The disadvantage with |
| * hard coding them is that they cannot easily be adjusted for future |
| * technological improvements appear. |
| */ |
| static unsigned int pbkdf2_iterations = 80000; |
| |
| static const unsigned char expected_output[] = { |
| |
| 0x4d, 0xdc, 0xd8, 0xf6, 0x0b, 0x98, 0xbe, 0x21, |
| 0x83, 0x0c, 0xee, 0x5e, 0xf2, 0x27, 0x01, 0xf9, |
| 0x64, 0x1a, 0x44, 0x18, 0xd0, 0x4c, 0x04, 0x14, |
| 0xae, 0xff, 0x08, 0x87, 0x6b, 0x34, 0xab, 0x56, |
| 0xa1, 0xd4, 0x25, 0xa1, 0x22, 0x58, 0x33, 0x54, |
| 0x9a, 0xdb, 0x84, 0x1b, 0x51, 0xc9, 0xb3, 0x17, |
| 0x6a, 0x27, 0x2b, 0xde, 0xbb, 0xa1, 0xd0, 0x78, |
| 0x47, 0x8f, 0x62, 0xb3, 0x97, 0xf3, 0x3c, 0x8d |
| }; |
| |
| int main(int argc, char **argv) |
| { |
| int rv = 1; |
| EVP_KDF *kdf = NULL; |
| EVP_KDF_CTX *kctx = NULL; |
| unsigned char out[64]; |
| OSSL_PARAM params[5], *p = params; |
| OSSL_LIB_CTX *library_context = NULL; |
| |
| library_context = OSSL_LIB_CTX_new(); |
| if (library_context == NULL) { |
| fprintf(stderr, "OSSL_LIB_CTX_new() returned NULL\n"); |
| goto end; |
| } |
| |
| /* Fetch the key derivation function implementation */ |
| kdf = EVP_KDF_fetch(library_context, "PBKDF2", NULL); |
| if (kdf == NULL) { |
| fprintf(stderr, "EVP_KDF_fetch() returned NULL\n"); |
| goto end; |
| } |
| |
| /* Create a context for the key derivation operation */ |
| kctx = EVP_KDF_CTX_new(kdf); |
| if (kctx == NULL) { |
| fprintf(stderr, "EVP_KDF_CTX_new() returned NULL\n"); |
| goto end; |
| } |
| |
| /* Set password */ |
| *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD, password, |
| sizeof(password)); |
| /* Set salt */ |
| *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT, pbkdf2_salt, |
| sizeof(pbkdf2_salt)); |
| /* Set iteration count (default 2048) */ |
| *p++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_ITER, &pbkdf2_iterations); |
| /* Set the underlying hash function used to derive the key */ |
| *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, |
| "SHA256", 0); |
| *p = OSSL_PARAM_construct_end(); |
| |
| /* Derive the key */ |
| if (EVP_KDF_derive(kctx, out, sizeof(out), params) != 1) { |
| fprintf(stderr, "EVP_KDF_derive() failed\n"); |
| goto end; |
| } |
| |
| if (CRYPTO_memcmp(expected_output, out, sizeof(expected_output)) != 0) { |
| fprintf(stderr, "Generated key does not match expected value\n"); |
| goto end; |
| } |
| |
| rv = 0; |
| end: |
| EVP_KDF_CTX_free(kctx); |
| EVP_KDF_free(kdf); |
| OSSL_LIB_CTX_free(library_context); |
| return rv; |
| } |