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https://github.com/cryb-to/cryb-to.git
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c2f4fa524f
We now have separate encryption and decryption methods, and can process an arbitrary amount of plaintext or ciphertext per call, rounded down to the block size (if applicable). For stream ciphers, we also have a keystream method which fills the provided buffer with an arbitrary amount of keystream (once again, rounded down if applicable).
90 lines
3.5 KiB
C
90 lines
3.5 KiB
C
/*-
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* Copyright (c) 2015-2016 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef CRYB_CIPHER_H_INCLUDED
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#define CRYB_CIPHER_H_INCLUDED
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#ifndef CRYB_TO
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#include <cryb/to.h>
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#endif
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CRYB_BEGIN
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const char *cryb_cipher_version(void);
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#define cipher_ctx cryb_cipher_ctx
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#define cipher_init_func cryb_cipher_init_func
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#define cipher_keystream_func cryb_cipher_keystream_func
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#define cipher_encrypt_func cryb_cipher_encrypt_func
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#define cipher_decrypt_func cryb_cipher_decrypt_func
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#define cipher_finish_func cryb_cipher_finish_func
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#define cipher_algorithm cryb_cipher_algorithm
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typedef enum {
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CIPHER_MODE_ENCRYPT = 0,
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CIPHER_MODE_DECRYPT = 1,
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} cipher_mode;
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typedef void cipher_ctx;
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typedef void (*cipher_init_func)(cipher_ctx *, cipher_mode, const uint8_t *, size_t);
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typedef void (*cipher_keystream_func)(cipher_ctx *, uint8_t *, size_t);
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typedef void (*cipher_encrypt_func)(cipher_ctx *, const void *, uint8_t *, size_t);
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typedef void (*cipher_decrypt_func)(cipher_ctx *, const uint8_t *, void *, size_t);
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typedef void (*cipher_finish_func)(cipher_ctx *);
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typedef struct {
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const char *name; /* algorithm name */
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size_t contextlen; /* size of context structure */
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size_t blocklen; /* block length */
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size_t keylen; /* key length */
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cipher_init_func init; /* initialize */
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cipher_keystream_func keystream; /* generate keystream */
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cipher_encrypt_func encrypt; /* encrypt */
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cipher_decrypt_func decrypt; /* decrypt */
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cipher_finish_func finish; /* finalize */
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} cipher_algorithm;
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#define get_cipher_algorithm cryb_get_cipher_algorithm
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const cipher_algorithm *get_cipher_algorithm(const char *);
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#define cipher_init(alg, ctx, mode, key, keylen) \
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(alg)->init((ctx), (mode), (key), (keylen))
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#define cipher_keystream(alg, ctx, out, len) \
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(alg)->keystream((ctx), (out), (len))
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#define cipher_encrypt(alg, ctx, in, out, len) \
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(alg)->encrypt((ctx), (in), (out), (len))
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#define cipher_decrypt(alg, ctx, in, out, len) \
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(alg)->decrypt((ctx), (in), (out), (len))
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#define cipher_finish(alg, ctx) \
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(alg)->finish((ctx))
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CRYB_END
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#endif
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