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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).
63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
/*-
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* Copyright (c) 2015-2017 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_RC4_H_INCLUDED
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#define CRYB_RC4_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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#include <cryb/cipher.h>
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CRYB_BEGIN
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#define rc4_cipher cryb_rc4_cipher
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#define rc4_ctx cryb_rc4_ctx
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#define rc4_init cryb_rc4_init
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#define rc4_keystream cryb_rc4_keystream
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#define rc4_encrypt cryb_rc4_encrypt
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#define rc4_decrypt cryb_rc4_decrypt
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#define rc4_finish cryb_rc4_finish
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extern cipher_algorithm rc4_cipher;
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typedef struct {
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uint8_t s[256], i, j;
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} rc4_ctx;
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void rc4_init(rc4_ctx *, cipher_mode mode, const uint8_t *, size_t);
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size_t rc4_keystream(rc4_ctx *, uint8_t *, size_t);
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size_t rc4_encrypt(rc4_ctx *, const void *, uint8_t *, size_t);
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size_t rc4_decrypt(rc4_ctx *, const uint8_t *, void *, size_t);
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void rc4_finish(rc4_ctx *);
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CRYB_END
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#endif
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