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/*
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* Secure eXtended Message Passing framework
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* Secure eXtended Transport layer implementation: (libsxt)
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* - very similar to SSH2/TLS
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* - using already proven and tested crypto algos
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* - better than TLS for message passing
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*
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* PublicPrivateKeyPairs operation API
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*
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* Copyright (c) 2014 by Aris Adamantiadis
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* (c) Alexander Vdolainen 2016 <avdolainen@zoho.com>
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*
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* libsxmp is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* libsxmp is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.";
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*
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*/
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#ifndef __SXT_SXTKEY_H__
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#define __SXT_SXTKEY_H__
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/* some taken code , copyright left in the header */
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#define ED25519_PK_LEN 32
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#define ED25519_SK_LEN 64
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#define ED25519_SIG_LEN 64
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typedef uint8_t ed25519_pubkey[ED25519_PK_LEN];
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typedef uint8_t ed25519_privkey[ED25519_SK_LEN];
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typedef uint8_t ed25519_signature[ED25519_SIG_LEN];
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/* here the supported types in SXT */
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#define PPKP_ED25519 0xa
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typedef struct sxtkey_type {
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uint8_t type;
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uint8_t flags;
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ed25519_pubkey *pubkey;
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ed25519_privkey *privkey;
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void *priv;
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} sxtkey_t;
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typedef struct sxtsignature_type {
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uint8_t type;
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ed25519_signature *sig;
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} sxtsignature_t;
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/* ed25519 related functions */
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/** @internal
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* @brief generate an ed25519 key pair
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* @param[out] pk generated public key
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* @param[out] sk generated secret key
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* @return 0 on success, -1 on error.
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* */
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int crypto_sign_ed25519_keypair(ed25519_pubkey pk, ed25519_privkey sk);
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/** @internal
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* @brief sign a message with ed25519
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* @param[out] sm location to store the signed message.
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* Its length should be mlen + 64.
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* @param[out] smlen pointer to the size of the signed message
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* @param[in] m message to be signed
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* @param[in] mlen length of the message to be signed
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* @param[in] sk secret key to sign the message with
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* @return 0 on success.
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*/
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int crypto_sign_ed25519(unsigned char *sm,unsigned long long *smlen,
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const unsigned char *m,unsigned long long mlen,
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const ed25519_privkey sk);
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/** @internal
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* @brief "open" and verify the signature of a signed message
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* @param[out] m location to store the verified message.
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* Its length should be equal to smlen.
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* @param[out] mlen pointer to the size of the verified message
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* @param[in] sm signed message to verify
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* @param[in] smlen length of the signed message to verify
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* @param[in] pk public key used to sign the message
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* @returns 0 on success (supposedly).
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*/
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int crypto_sign_ed25519_open(unsigned char *m,unsigned long long *mlen,
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const unsigned char *sm,unsigned long long smlen,
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const ed25519_pubkey pk);
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/** @} */
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#endif /* __SXT_SXTKEY_H__ */
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