diff options
author | Pauli <pauli@openssl.org> | 2021-07-19 13:00:23 +1000 |
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committer | Pauli <pauli@openssl.org> | 2021-07-20 10:14:42 +1000 |
commit | 73a3b967e915487565fe04c0e6530d8081e6c3a5 (patch) | |
tree | a3c65a93f109eac0d1ce28bae8605601f35ecbdd /demos | |
parent | d2f25d5c0aa5f96766ce1f49bedba35a5330cfdb (diff) | |
download | openssl-73a3b967e915487565fe04c0e6530d8081e6c3a5.tar.gz |
demo: add scrypt demonstration program
Using test vector from RTC 7914
Fixes #14108
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/16109)
Diffstat (limited to 'demos')
-rw-r--r-- | demos/kdf/scrypt.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/demos/kdf/scrypt.c b/demos/kdf/scrypt.c new file mode 100644 index 0000000000..2be9908800 --- /dev/null +++ b/demos/kdf/scrypt.c @@ -0,0 +1,120 @@ +/* + * 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 scrypt_salt[] = { + 'N', 'a', 'C', 'l' +}; + +/* + * The SCRYPT parameters 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 scrypt_n = 1024; +static unsigned int scrypt_r = 8; +static unsigned int scrypt_p = 16; + +static const unsigned char expected_output[] = { + + 0xfd, 0xba, 0xbe, 0x1c, 0x9d, 0x34, 0x72, 0x00, + 0x78, 0x56, 0xe7, 0x19, 0x0d, 0x01, 0xe9, 0xfe, + 0x7c, 0x6a, 0xd7, 0xcb, 0xc8, 0x23, 0x78, 0x30, + 0xe7, 0x73, 0x76, 0x63, 0x4b, 0x37, 0x31, 0x62, + 0x2e, 0xaf, 0x30, 0xd9, 0x2e, 0x22, 0xa3, 0x88, + 0x6f, 0xf1, 0x09, 0x27, 0x9d, 0x98, 0x30, 0xda, + 0xc7, 0x27, 0xaf, 0xb9, 0x4a, 0x83, 0xee, 0x6d, + 0x83, 0x60, 0xcb, 0xdf, 0xa2, 0xcc, 0x06, 0x40 +}; + +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[6], *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, "SCRYPT", 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, scrypt_salt, + sizeof(scrypt_salt)); + /* Set N (default 1048576) */ + *p++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_SCRYPT_N, &scrypt_n); + /* Set R (default 8) */ + *p++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_SCRYPT_R, &scrypt_r); + /* Set P (default 1) */ + *p++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_SCRYPT_P, &scrypt_p); + *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; +} |