C++ (Cpp) pgp_teardown_memory_write Examples

Example #1

/* this interface isn't right - hook into callback for getting passphrase */
char *
pgp_export_key(pgp_io_t *io, const pgp_key_t *keydata, uint8_t *passphrase)
{
	pgp_output_t	*output;
	pgp_memory_t	*mem;
	char		*cp;

	__PGP_USED(io);
	pgp_setup_memory_write(&output, &mem, 128);
	if (keydata->type == PGP_PTAG_CT_PUBLIC_KEY) {
		pgp_write_xfer_pubkey(output, keydata, 1);
	} else {
		pgp_write_xfer_seckey(output, keydata, passphrase,
					strlen((char *)passphrase), 1);
	}
	cp = netpgp_strdup(pgp_mem_data(mem));
	pgp_teardown_memory_write(output, mem);
	return cp;
}

Example #2

File: openssl_crypto.c Project: Henauxg/minix

/**
 \ingroup HighLevel_KeyGenerate
 \brief Generates an RSA keypair
 \param numbits Modulus size
 \param e Public Exponent
 \param keydata Pointer to keydata struct to hold new key
 \return 1 if key generated successfully; otherwise 0
 \note It is the caller's responsibility to call pgp_keydata_free(keydata)
*/
static unsigned 
rsa_generate_keypair(pgp_key_t *keydata,
			const int numbits,
			const unsigned long e,
			const char *hashalg,
			const char *cipher)
{
	pgp_seckey_t *seckey;
	RSA            *rsa;
	BN_CTX         *ctx;
	pgp_output_t *output;
	pgp_memory_t   *mem;

	ctx = BN_CTX_new();
	pgp_keydata_init(keydata, PGP_PTAG_CT_SECRET_KEY);
	seckey = pgp_get_writable_seckey(keydata);

	/* generate the key pair */

	rsa = RSA_generate_key(numbits, e, NULL, NULL);

	/* populate pgp key from ssl key */

	seckey->pubkey.version = PGP_V4;
	seckey->pubkey.birthtime = time(NULL);
	seckey->pubkey.days_valid = 0;
	seckey->pubkey.alg = PGP_PKA_RSA;

	seckey->pubkey.key.rsa.n = BN_dup(rsa->n);
	seckey->pubkey.key.rsa.e = BN_dup(rsa->e);

	seckey->s2k_usage = PGP_S2KU_ENCRYPTED_AND_HASHED;
	seckey->s2k_specifier = PGP_S2KS_SALTED;
	/* seckey->s2k_specifier=PGP_S2KS_SIMPLE; */
	if ((seckey->hash_alg = pgp_str_to_hash_alg(hashalg)) == PGP_HASH_UNKNOWN) {
		seckey->hash_alg = PGP_HASH_SHA1;
	}
	seckey->alg = pgp_str_to_cipher(cipher);
	seckey->octetc = 0;
	seckey->checksum = 0;

	seckey->key.rsa.d = BN_dup(rsa->d);
	seckey->key.rsa.p = BN_dup(rsa->p);
	seckey->key.rsa.q = BN_dup(rsa->q);
	seckey->key.rsa.u = BN_mod_inverse(NULL, rsa->p, rsa->q, ctx);
	if (seckey->key.rsa.u == NULL) {
		(void) fprintf(stderr, "seckey->key.rsa.u is NULL\n");
		return 0;
	}
	BN_CTX_free(ctx);

	RSA_free(rsa);

	pgp_keyid(keydata->sigid, PGP_KEY_ID_SIZE, &keydata->key.seckey.pubkey, seckey->hash_alg);
	pgp_fingerprint(&keydata->sigfingerprint, &keydata->key.seckey.pubkey, seckey->hash_alg);

	/* Generate checksum */

	output = NULL;
	mem = NULL;

	pgp_setup_memory_write(&output, &mem, 128);

	pgp_push_checksum_writer(output, seckey);

	switch (seckey->pubkey.alg) {
	case PGP_PKA_DSA:
		return pgp_write_mpi(output, seckey->key.dsa.x);
	case PGP_PKA_RSA:
	case PGP_PKA_RSA_ENCRYPT_ONLY:
	case PGP_PKA_RSA_SIGN_ONLY:
		if (!pgp_write_mpi(output, seckey->key.rsa.d) ||
		    !pgp_write_mpi(output, seckey->key.rsa.p) ||
		    !pgp_write_mpi(output, seckey->key.rsa.q) ||
		    !pgp_write_mpi(output, seckey->key.rsa.u)) {
			return 0;
		}
		break;
	case PGP_PKA_ELGAMAL:
		return pgp_write_mpi(output, seckey->key.elgamal.x);

	default:
		(void) fprintf(stderr, "Bad seckey->pubkey.alg\n");
		return 0;
	}

	/* close rather than pop, since its the only one on the stack */
	pgp_writer_close(output);
	pgp_teardown_memory_write(output, mem);

	/* should now have checksum in seckey struct */

	/* test */
	if (pgp_get_debug_level(__FILE__)) {
		test_seckey(seckey);
	}

	return 1;
}