diff options
Diffstat (limited to 'demos/kdf/pbkdf2.c')
-rw-r--r-- | demos/kdf/pbkdf2.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/demos/kdf/pbkdf2.c b/demos/kdf/pbkdf2.c new file mode 100644 index 0000000000..3e0adaee79 --- /dev/null +++ b/demos/kdf/pbkdf2.c @@ -0,0 +1,117 @@ +/* + * 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; +} |