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/*
* crypto.h
* vim: expandtab:ts=4:sts=4:sw=4
*
* Copyright (C) 2019 Paul Fariello <paul@fariello.eu>
*
* This file is part of Profani-tty.
*
* Profani-tty 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 3 of the License, or
* (at your option) any later version.
*
* Profani-tty 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 Profani-tty. If not, see <https://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give permission to
* link the code of portions of this program with the OpenSSL library under
* certain conditions as described in each individual source file, and
* distribute linked combinations including the two.
*
* You must obey the GNU General Public License in all respects for all of the
* code used other than OpenSSL. If you modify file(s) with this exception, you
* may extend this exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this exception
* statement from your version. If you delete this exception statement from all
* source files in the program, then also delete it here.
*
*/
#include <stdio.h>
#include <stdbool.h>
#include <signal/signal_protocol_types.h>
#include <gcrypt.h>
#define AES128_GCM_KEY_LENGTH 16
#define AES128_GCM_IV_LENGTH 12
#define AES128_GCM_TAG_LENGTH 16
int omemo_crypto_init(void);
/**
* Callback for a secure random number generator.
* This function shall fill the provided buffer with random bytes.
*
* @param data pointer to the output buffer
* @param len size of the output buffer
* @return 0 on success, negative on failure
*/
int omemo_random_func(uint8_t* data, size_t len, void* user_data);
/**
* Callback for an HMAC-SHA256 implementation.
* This function shall initialize an HMAC context with the provided key.
*
* @param hmac_context private HMAC context pointer
* @param key pointer to the key
* @param key_len length of the key
* @return 0 on success, negative on failure
*/
int omemo_hmac_sha256_init_func(void** hmac_context, const uint8_t* key, size_t key_len, void* user_data);
/**
* Callback for an HMAC-SHA256 implementation.
* This function shall update the HMAC context with the provided data
*
* @param hmac_context private HMAC context pointer
* @param data pointer to the data
* @param data_len length of the data
* @return 0 on success, negative on failure
*/
int omemo_hmac_sha256_update_func(void* hmac_context, const uint8_t* data, size_t data_len, void* user_data);
/**
* Callback for an HMAC-SHA256 implementation.
* This function shall finalize an HMAC calculation and populate the output
* buffer with the result.
*
* @param hmac_context private HMAC context pointer
* @param output buffer to be allocated and populated with the result
* @return 0 on success, negative on failure
*/
int omemo_hmac_sha256_final_func(void* hmac_context, signal_buffer** output, void* user_data);
/**
* Callback for an HMAC-SHA256 implementation.
* This function shall free the private context allocated in
* hmac_sha256_init_func.
*
* @param hmac_context private HMAC context pointer
*/
void omemo_hmac_sha256_cleanup_func(void* hmac_context, void* user_data);
/**
* Callback for a SHA512 message digest implementation.
* This function shall initialize a digest context.
*
* @param digest_context private digest context pointer
* @return 0 on success, negative on failure
*/
int omemo_sha512_digest_init_func(void** digest_context, void* user_data);
/**
* Callback for a SHA512 message digest implementation.
* This function shall update the digest context with the provided data.
*
* @param digest_context private digest context pointer
* @param data pointer to the data
* @param data_len length of the data
* @return 0 on success, negative on failure
*/
int omemo_sha512_digest_update_func(void* digest_context, const uint8_t* data, size_t data_len, void* user_data);
/**
* Callback for a SHA512 message digest implementation.
* This function shall finalize the digest calculation, populate the
* output buffer with the result, and prepare the context for reuse.
*
* @param digest_context private digest context pointer
* @param output buffer to be allocated and populated with the result
* @return 0 on success, negative on failure
*/
int omemo_sha512_digest_final_func(void* digest_context, signal_buffer** output, void* user_data);
/**
* Callback for a SHA512 message digest implementation.
* This function shall free the private context allocated in
* sha512_digest_init_func.
*
* @param digest_context private digest context pointer
*/
void omemo_sha512_digest_cleanup_func(void* digest_context, void* user_data);
/**
* Callback for an AES encryption implementation.
*
* @param output buffer to be allocated and populated with the ciphertext
* @param cipher specific cipher variant to use, either SG_CIPHER_AES_CTR_NOPADDING or SG_CIPHER_AES_CBC_PKCS5
* @param key the encryption key
* @param key_len length of the encryption key
* @param iv the initialization vector
* @param iv_len length of the initialization vector
* @param plaintext the plaintext to encrypt
* @param plaintext_len length of the plaintext
* @return 0 on success, negative on failure
*/
int omemo_encrypt_func(signal_buffer** output,
int cipher,
const uint8_t* key, size_t key_len,
const uint8_t* iv, size_t iv_len,
const uint8_t* plaintext, size_t plaintext_len,
void* user_data);
/**
* Callback for an AES decryption implementation.
*
* @param output buffer to be allocated and populated with the plaintext
* @param cipher specific cipher variant to use, either SG_CIPHER_AES_CTR_NOPADDING or SG_CIPHER_AES_CBC_PKCS5
* @param key the encryption key
* @param key_len length of the encryption key
* @param iv the initialization vector
* @param iv_len length of the initialization vector
* @param ciphertext the ciphertext to decrypt
* @param ciphertext_len length of the ciphertext
* @return 0 on success, negative on failure
*/
int omemo_decrypt_func(signal_buffer** output,
int cipher,
const uint8_t* key, size_t key_len,
const uint8_t* iv, size_t iv_len,
const uint8_t* ciphertext, size_t ciphertext_len,
void* user_data);
int aes128gcm_encrypt(unsigned char* ciphertext, size_t* ciphertext_len,
unsigned char* tag, size_t* tag_len,
const unsigned char* const plaintext, size_t plaintext_len,
const unsigned char* const iv, const unsigned char* const key);
int aes128gcm_decrypt(unsigned char* plaintext,
size_t* plaintext_len, const unsigned char* const ciphertext,
size_t ciphertext_len, const unsigned char* const iv, size_t iv_len,
const unsigned char* const key, const unsigned char* const tag);
gcry_error_t aes256gcm_crypt_file(FILE* in, FILE* out, off_t file_size,
unsigned char key[], unsigned char nonce[], bool encrypt);
char* aes256gcm_create_secure_fragment(unsigned char* key,
unsigned char* nonce);
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