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/* Cipher algorithms, for libreswan
*
* Copyright (C) 2024 Andrew Cagney
*
* This program 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 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program 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.
*/
#ifndef CRYPT_CIPHER_H
#define CRYPT_CIPHER_H
#include <pk11pub.h>
#include "chunk.h"
#include "shunk.h"
struct encrypt_desc;
struct logger;
struct cipher_context;
struct crypt_mac;
enum cipher_op {
DECRYPT = false,
ENCRYPT = true,
};
#define str_cipher_op(OP) \
({ \
enum cipher_op op_ = OP; \
(op_ == ENCRYPT ? "encrypt" : \
op_ == DECRYPT ? "decrypt" : \
"???"); \
})
/*
* Normally USE_IV:DECRYPT and FILL_IV:ENCRIPT each come as a pair.
* The exception is testing where encryption can't generate its own
* IV.
*/
enum cipher_iv_source {
USE_WIRE_IV = 1,
FILL_WIRE_IV,
USE_IKEv1_IV,
};
#define str_cipher_iv_source(IV_SOURCE) \
({ \
enum cipher_iv_source iv_source_ = IV_SOURCE; \
(iv_source_ == USE_WIRE_IV ? "use wire IV" : \
iv_source_ == FILL_WIRE_IV ? "fill wire IV" : \
iv_source_ == USE_IKEv1_IV ? "use IKEv1 IV" : \
"???"); \
})
/*
* Separate cipher and integrity.
*/
void cipher_ikev1(const struct encrypt_desc *cipher,
enum cipher_op op,
chunk_t text,
struct crypt_mac *iv,
PK11SymKey *key,
struct logger *logger);
bool cipher_aead(const struct encrypt_desc *cipher,
enum cipher_op op,
enum cipher_iv_source iv_source,
shunk_t salt,
chunk_t wire_iv,
shunk_t aad,
chunk_t text_and_tag,
size_t text_size, size_t tag_size,
PK11SymKey *key,
struct logger *logger);
struct cipher_context *cipher_context_create(const struct encrypt_desc *cipher,
enum cipher_op op,
enum cipher_iv_source iv_source,
PK11SymKey *key,
shunk_t salt,
struct logger *logger);
void cipher_context_destroy(struct cipher_context **,
struct logger *logger);
void cipher_context_op_normal(const struct cipher_context *,
chunk_t wire_iv,
chunk_t text,
struct crypt_mac *ikev1_iv,
struct logger *logger);
bool cipher_context_op_aead(const struct cipher_context *,
chunk_t wire_iv,
shunk_t aad,
chunk_t text_and_tag,
size_t text_size, size_t tag_size,
struct logger *logger);
#endif
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