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/*
* This file is part of the SSH Library
*
* Copyright (c) 2014 by Aris Adamantiadis
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef ED25519_H_
#define ED25519_H_
#include "libssh/priv.h"
/**
* @defgroup ed25519 ed25519 API
* @internal
* @brief API for DJB's ed25519
*
* @{ */
#define ED25519_PK_LEN 32
#define ED25519_SK_LEN 64
#define ED25519_SIG_LEN 64
typedef uint8_t ed25519_pubkey[ED25519_PK_LEN];
typedef uint8_t ed25519_privkey[ED25519_SK_LEN];
typedef uint8_t ed25519_signature[ED25519_SIG_LEN];
/** @internal
* @brief generate an ed25519 key pair
* @param[out] pk generated public key
* @param[out] sk generated secret key
* @return 0 on success, -1 on error.
* */
int crypto_sign_ed25519_keypair(ed25519_pubkey pk, ed25519_privkey sk);
/** @internal
* @brief sign a message with ed25519
* @param[out] sm location to store the signed message.
* Its length should be mlen + 64.
* @param[out] smlen pointer to the size of the signed message
* @param[in] m message to be signed
* @param[in] mlen length of the message to be signed
* @param[in] sk secret key to sign the message with
* @return 0 on success.
*/
int crypto_sign_ed25519(
unsigned char *sm, uint64_t *smlen,
const unsigned char *m, uint64_t mlen,
const ed25519_privkey sk);
/** @internal
* @brief "open" and verify the signature of a signed message
* @param[out] m location to store the verified message.
* Its length should be equal to smlen.
* @param[out] mlen pointer to the size of the verified message
* @param[in] sm signed message to verify
* @param[in] smlen length of the signed message to verify
* @param[in] pk public key used to sign the message
* @returns 0 on success (supposedly).
*/
int crypto_sign_ed25519_open(
unsigned char *m, uint64_t *mlen,
const unsigned char *sm, uint64_t smlen,
const ed25519_pubkey pk);
/** @} */
#endif /* ED25519_H_ */
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