pubkey_test.c

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/*
 * Copyright (C) 2024 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

/** @file
 *
 * Public key self-tests
 *
 */

/* Forcibly enable assertions */
#undef NDEBUG

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ipxe/crypto.h>
#include <ipxe/test.h>
#include "pubkey_test.h"

/**
 * Report public key encryption and decryption test result
 *
 * @v test              Public key encryption and decryption test
 * @v file              Test code file
 * @v line              Test code line
 */
void pubkey_okx ( struct pubkey_test *test, const char *file,
                  unsigned int line ) {
        struct pubkey_algorithm *pubkey = test->pubkey;
        struct asn1_builder plaintext;
        struct asn1_builder ciphertext;

        /* Test key matching */
        okx ( pubkey_match ( pubkey, &test->private, &test->public ) == 0,
              file, line );

        /* Test decrypting with private key to obtain known plaintext */
        plaintext.data = NULL;
        plaintext.len = 0;
        okx ( pubkey_decrypt ( pubkey, &test->private, &test->ciphertext,
                               &plaintext ) == 0, file, line );
        okx ( asn1_compare ( asn1_built ( &plaintext ),
                             &test->plaintext ) == 0, file, line );
        free ( plaintext.data );

        /* Test encrypting with private key and decrypting with public key */
        ciphertext.data = NULL;
        ciphertext.len = 0;
        plaintext.data = NULL;
        plaintext.len = 0;
        okx ( pubkey_encrypt ( pubkey, &test->private, &test->plaintext,
                               &ciphertext ) == 0, file, line );
        okx ( pubkey_decrypt ( pubkey, &test->public,
                               asn1_built ( &ciphertext ),
                               &plaintext ) == 0, file, line );
        okx ( asn1_compare ( asn1_built ( &plaintext ),
                             &test->plaintext ) == 0, file, line );
        free ( ciphertext.data );
        free ( plaintext.data );

        /* Test encrypting with public key and decrypting with private key */
        ciphertext.data = NULL;
        ciphertext.len = 0;
        plaintext.data = NULL;
        plaintext.len = 0;
        okx ( pubkey_encrypt ( pubkey, &test->public, &test->plaintext,
                               &ciphertext ) == 0, file, line );
        okx ( pubkey_decrypt ( pubkey, &test->private,
                               asn1_built ( &ciphertext ),
                               &plaintext ) == 0, file, line );
        okx ( asn1_compare ( asn1_built ( &plaintext ),
                             &test->plaintext ) == 0, file, line );
        free ( ciphertext.data );
        free ( plaintext.data );
}

/**
 * Report public key signature test result
 *
 * @v test              Public key signature test
 * @v file              Test code file
 * @v line              Test code line
 */
void pubkey_sign_okx ( struct pubkey_sign_test *test, const char *file,
                       unsigned int line ) {
        struct pubkey_algorithm *pubkey = test->pubkey;
        struct digest_algorithm *digest = test->digest;
        uint8_t digestctx[digest->ctxsize ];
        uint8_t digestout[digest->digestsize];
        struct asn1_builder signature = { NULL, 0 };
        uint8_t *bad;

        /* Test key matching */
        okx ( pubkey_match ( pubkey, &test->private, &test->public ) == 0,
              file, line );

        /* Construct digest over plaintext */
        digest_init ( digest, digestctx );
        digest_update ( digest, digestctx, test->plaintext,
                        test->plaintext_len );
        digest_final ( digest, digestctx, digestout );

        /* Test signing using private key */
        okx ( pubkey_sign ( pubkey, &test->private, digest, digestout,
                            &signature ) == 0, file, line );
        okx ( signature.len != 0, file, line );
        okx ( asn1_compare ( asn1_built ( &signature ),
                             &test->signature ) == 0, file, line );

        /* Test verification using public key */
        okx ( pubkey_verify ( pubkey, &test->public, digest, digestout,
                              &test->signature ) == 0, file, line );

        /* Test verification failure of modified signature */
        bad = ( signature.data + ( test->signature.len / 2 ) );
        okx ( pubkey_verify ( pubkey, &test->public, digest, digestout,
                              asn1_built ( &signature ) ) == 0, file, line );
        *bad ^= 0x40;
        okx ( pubkey_verify ( pubkey, &test->public, digest, digestout,
                              asn1_built ( &signature ) ) != 0, file, line );

        /* Free signature */
        free ( signature.data );
}