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09ff84bd27
The demo code is quite often block copied for new demos, so this PR changes demos to use EXIT_SUCCESS & EXIT_FAILURE instead of using 0 and 1. Internal functions use the normal notation of 0 = error, 1 = success, but the value returned by main() must use EXIT_SUCCESS and EXIT_FAILURE. Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/20545)
118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/*
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* Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <openssl/core_names.h>
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#include <openssl/crypto.h>
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#include <openssl/kdf.h>
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#include <openssl/obj_mac.h>
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#include <openssl/params.h>
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/*
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* test vector from
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* https://datatracker.ietf.org/doc/html/rfc7914
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*/
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/*
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* Hard coding a password into an application is very bad.
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* It is done here solely for educational purposes.
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*/
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static unsigned char password[] = {
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'P', 'a', 's', 's', 'w', 'o', 'r', 'd'
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};
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/*
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* The salt is better not being hard coded too. Each password should have a
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* different salt if possible. The salt is not considered secret information
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* and is safe to store with an encrypted password.
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*/
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static unsigned char pbkdf2_salt[] = {
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'N', 'a', 'C', 'l'
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};
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/*
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* The iteration parameter can be variable or hard coded. The disadvantage with
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* hard coding them is that they cannot easily be adjusted for future
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* technological improvements appear.
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*/
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static unsigned int pbkdf2_iterations = 80000;
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static const unsigned char expected_output[] = {
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0x4d, 0xdc, 0xd8, 0xf6, 0x0b, 0x98, 0xbe, 0x21,
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0x83, 0x0c, 0xee, 0x5e, 0xf2, 0x27, 0x01, 0xf9,
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0x64, 0x1a, 0x44, 0x18, 0xd0, 0x4c, 0x04, 0x14,
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0xae, 0xff, 0x08, 0x87, 0x6b, 0x34, 0xab, 0x56,
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0xa1, 0xd4, 0x25, 0xa1, 0x22, 0x58, 0x33, 0x54,
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0x9a, 0xdb, 0x84, 0x1b, 0x51, 0xc9, 0xb3, 0x17,
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0x6a, 0x27, 0x2b, 0xde, 0xbb, 0xa1, 0xd0, 0x78,
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0x47, 0x8f, 0x62, 0xb3, 0x97, 0xf3, 0x3c, 0x8d
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};
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int main(int argc, char **argv)
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{
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int ret = EXIT_FAILURE;
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EVP_KDF *kdf = NULL;
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EVP_KDF_CTX *kctx = NULL;
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unsigned char out[64];
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OSSL_PARAM params[5], *p = params;
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OSSL_LIB_CTX *library_context = NULL;
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library_context = OSSL_LIB_CTX_new();
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if (library_context == NULL) {
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fprintf(stderr, "OSSL_LIB_CTX_new() returned NULL\n");
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goto end;
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}
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/* Fetch the key derivation function implementation */
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kdf = EVP_KDF_fetch(library_context, "PBKDF2", NULL);
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if (kdf == NULL) {
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fprintf(stderr, "EVP_KDF_fetch() returned NULL\n");
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goto end;
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}
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/* Create a context for the key derivation operation */
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kctx = EVP_KDF_CTX_new(kdf);
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if (kctx == NULL) {
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fprintf(stderr, "EVP_KDF_CTX_new() returned NULL\n");
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goto end;
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}
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/* Set password */
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD, password,
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sizeof(password));
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/* Set salt */
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT, pbkdf2_salt,
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sizeof(pbkdf2_salt));
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/* Set iteration count (default 2048) */
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*p++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_ITER, &pbkdf2_iterations);
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/* Set the underlying hash function used to derive the key */
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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"SHA256", 0);
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*p = OSSL_PARAM_construct_end();
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/* Derive the key */
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if (EVP_KDF_derive(kctx, out, sizeof(out), params) != 1) {
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fprintf(stderr, "EVP_KDF_derive() failed\n");
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goto end;
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}
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if (CRYPTO_memcmp(expected_output, out, sizeof(expected_output)) != 0) {
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fprintf(stderr, "Generated key does not match expected value\n");
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goto end;
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}
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ret = EXIT_SUCCESS;
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end:
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EVP_KDF_CTX_free(kctx);
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EVP_KDF_free(kdf);
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OSSL_LIB_CTX_free(library_context);
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return ret;
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}
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