04c36b5062
RC4_CHAR is a bit in the x86(-64) CPUID information that switches the RC4 asm code from using an array of 256 uint32_t's to 256 uint8_t's. It was originally written for the P4, where the uint8_t style was faster. (On modern chips, setting RC4_CHAR took RC4-MD5 from 458 to 304 MB/s. Although I wonder whether, on a server with many connections, using less cache wouldn't be better.) However, I'm not too worried about a slowdown of RC4 on P4 systems these days (the last new P4 chip was released nine years ago) and I want the code to be simplier. Also, RC4_CHAR was set when the CPUID family was 15, but Intel actually lists 15 as a special code meaning "also check the extended family bits", which the asm didn't do. The RC4_CHAR support remains in the RC4 asm code to avoid drift with upstream. Change-Id: If3febc925a83a76f453b9e9f8de5ee43759927c6 Reviewed-on: https://boringssl-review.googlesource.com/3550 Reviewed-by: David Benjamin <davidben@chromium.org> Reviewed-by: Adam Langley <agl@google.com>
92 lines
3.8 KiB
C
92 lines
3.8 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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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 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.] */
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#ifndef OPENSSL_HEADER_RC4_H
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#define OPENSSL_HEADER_RC4_H
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#include <openssl/base.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* RC4. */
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typedef struct rc4_key_st {
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uint32_t x, y;
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uint32_t data[256];
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} RC4_KEY;
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/* RC4_set_key performs an RC4 key schedule and initialises |rc4key| with |len|
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* bytes of key material from |key|. */
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OPENSSL_EXPORT void RC4_set_key(RC4_KEY *rc4key, unsigned len,
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const uint8_t *key);
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/* RC4 encrypts (or decrypts, it's the same with RC4) |len| bytes from |in| to
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* |out|. */
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OPENSSL_EXPORT void RC4(RC4_KEY *key, size_t len, const uint8_t *in,
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uint8_t *out);
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#if defined(__cplusplus)
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} /* extern C */
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#endif
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#endif /* OPENSSL_HEADER_RC4_H */
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