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