/*	$OpenBSD$	*/
/*
 * Copyright (c) 2011 Damien Miller
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <errno.h>
#include <string.h>
#include "err.h"

const char *
ssh_err(int n)
{
	switch (n) {
	case SSH_ERR_SUCCESS:
		return "success";
	case SSH_ERR_INTERNAL_ERROR:
		return "internal buffer error";
	case SSH_ERR_ALLOC_FAIL:
		return "memory allocation failed";
	case SSH_ERR_MESSAGE_INCOMPLETE:
		return "incomplete message";
	case SSH_ERR_INVALID_FORMAT:
		return "invalid format";
	case SSH_ERR_BIGNUM_IS_NEGATIVE:
		return "bignum is negative";
	case SSH_ERR_BIGNUM_TOO_LARGE:
		return "bignum is too large";
	case SSH_ERR_ECPOINT_TOO_LARGE:
		return "elliptic curve point is too large";
	case SSH_ERR_NO_BUFFER_SPACE:
		return "insufficient buffer space";
	case SSH_ERR_INVALID_ARGUMENT:
		return "invalid argument";
	case SSH_ERR_KEY_BITS_MISMATCH:
		return "key bits do not match";
	case SSH_ERR_EC_CURVE_INVALID:
		return "invalid elliptic curve";
	case SSH_ERR_KEY_TYPE_MISMATCH:
		return "key type does not match";
	case SSH_ERR_KEY_TYPE_UNKNOWN:
		return "unknown or unsupported key type";
	case SSH_ERR_EC_CURVE_MISMATCH:
		return "elliptic curve does not match";
	case SSH_ERR_EXPECTED_CERT:
		return "plain key provided where certificate required";
	case SSH_ERR_KEY_LACKS_CERTBLOB:
		return "key lacks certificate data";
	case SSH_ERR_KEY_CERT_UNKNOWN_TYPE:
		return "unknown/unsupported certificate type";
	case SSH_ERR_KEY_CERT_INVALID_SIGN_KEY:
		return "invalid certificate signing key";
	case SSH_ERR_KEY_INVALID_EC_VALUE:
		return "invalid elliptic curve value";
	case SSH_ERR_SIGNATURE_INVALID:
		return "incorrect signature";
	case SSH_ERR_LIBCRYPTO_ERROR:
		return "error in libcrypto";  /* XXX fetch and return */
	case SSH_ERR_UNEXPECTED_TRAILING_DATA:
		return "unexpected bytes remain after decoding";
	case SSH_ERR_SYSTEM_ERROR:
		return strerror(errno);
	case SSH_ERR_KEY_CERT_INVALID:
		return "invalid certificate";
	case SSH_ERR_AGENT_COMMUNICATION:
		return "communication with agent failed";
	case SSH_ERR_AGENT_FAILURE:
		return "agent refused operation";
	default:
		return "unknown error";
	}
}