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283
external/boringssl/crypto/rc4/rc4.c
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283
external/boringssl/crypto/rc4/rc4.c
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/* 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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#include <openssl/rc4.h>
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#if defined(OPENSSL_NO_ASM) || \
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(!defined(OPENSSL_X86_64) && !defined(OPENSSL_X86))
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#if defined(OPENSSL_64_BIT)
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#define RC4_CHUNK uint64_t
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#elif defined(OPENSSL_32_BIT)
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#define RC4_CHUNK uint32_t
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#else
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#error "Unknown word size"
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#endif
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/* RC4 as implemented from a posting from
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* Newsgroups: sci.crypt
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* From: sterndark@netcom.com (David Sterndark)
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* Subject: RC4 Algorithm revealed.
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* Message-ID: <sternCvKL4B.Hyy@netcom.com>
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* Date: Wed, 14 Sep 1994 06:35:31 GMT */
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void RC4(RC4_KEY *key, size_t len, const uint8_t *in, uint8_t *out) {
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uint32_t *d;
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uint32_t x, y, tx, ty;
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size_t i;
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x = key->x;
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y = key->y;
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d = key->data;
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#define RC4_STEP \
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(x = (x + 1) & 0xff, tx = d[x], y = (tx + y) & 0xff, ty = d[y], d[y] = tx, \
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d[x] = ty, (RC4_CHUNK)d[(tx + ty) & 0xff])
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if ((((size_t)in & (sizeof(RC4_CHUNK) - 1)) |
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((size_t)out & (sizeof(RC4_CHUNK) - 1))) == 0) {
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RC4_CHUNK ichunk, otp;
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const union {
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long one;
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char little;
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} is_endian = {1};
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/* I reckon we can afford to implement both endian
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* cases and to decide which way to take at run-time
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* because the machine code appears to be very compact
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* and redundant 1-2KB is perfectly tolerable (i.e.
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* in case the compiler fails to eliminate it:-). By
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* suggestion from Terrel Larson <terr@terralogic.net>
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* who also stands for the is_endian union:-)
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*
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* Special notes.
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*
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* - is_endian is declared automatic as doing otherwise
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* (declaring static) prevents gcc from eliminating
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* the redundant code;
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* - compilers (those I've tried) don't seem to have
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* problems eliminating either the operators guarded
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* by "if (sizeof(RC4_CHUNK)==8)" or the condition
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* expressions themselves so I've got 'em to replace
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* corresponding #ifdefs from the previous version;
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* - I chose to let the redundant switch cases when
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* sizeof(RC4_CHUNK)!=8 be (were also #ifdefed
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* before);
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* - in case you wonder "&(sizeof(RC4_CHUNK)*8-1)" in
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* [LB]ESHFT guards against "shift is out of range"
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* warnings when sizeof(RC4_CHUNK)!=8
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*
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* <appro@fy.chalmers.se> */
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if (!is_endian.little) { /* BIG-ENDIAN CASE */
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#define BESHFT(c) \
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(((sizeof(RC4_CHUNK) - (c) - 1) * 8) & (sizeof(RC4_CHUNK) * 8 - 1))
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for (; len & (0 - sizeof(RC4_CHUNK)); len -= sizeof(RC4_CHUNK)) {
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ichunk = *(RC4_CHUNK *)in;
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otp = RC4_STEP << BESHFT(0);
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otp |= RC4_STEP << BESHFT(1);
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otp |= RC4_STEP << BESHFT(2);
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otp |= RC4_STEP << BESHFT(3);
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#if defined(OPENSSL_64_BIT)
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otp |= RC4_STEP << BESHFT(4);
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otp |= RC4_STEP << BESHFT(5);
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otp |= RC4_STEP << BESHFT(6);
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otp |= RC4_STEP << BESHFT(7);
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#endif
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*(RC4_CHUNK *)out = otp ^ ichunk;
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in += sizeof(RC4_CHUNK);
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out += sizeof(RC4_CHUNK);
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}
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} else { /* LITTLE-ENDIAN CASE */
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#define LESHFT(c) (((c) * 8) & (sizeof(RC4_CHUNK) * 8 - 1))
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for (; len & (0 - sizeof(RC4_CHUNK)); len -= sizeof(RC4_CHUNK)) {
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ichunk = *(RC4_CHUNK *)in;
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otp = RC4_STEP;
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otp |= RC4_STEP << 8;
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otp |= RC4_STEP << 16;
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otp |= RC4_STEP << 24;
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#if defined(OPENSSL_64_BIT)
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otp |= RC4_STEP << LESHFT(4);
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otp |= RC4_STEP << LESHFT(5);
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otp |= RC4_STEP << LESHFT(6);
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otp |= RC4_STEP << LESHFT(7);
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#endif
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*(RC4_CHUNK *)out = otp ^ ichunk;
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in += sizeof(RC4_CHUNK);
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out += sizeof(RC4_CHUNK);
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}
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}
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}
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#define LOOP(in, out) \
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x = ((x + 1) & 0xff); \
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tx = d[x]; \
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y = (tx + y) & 0xff; \
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d[x] = ty = d[y]; \
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d[y] = tx; \
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(out) = d[(tx + ty) & 0xff] ^ (in);
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#ifndef RC4_INDEX
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#define RC4_LOOP(a, b, i) LOOP(*((a)++), *((b)++))
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#else
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#define RC4_LOOP(a, b, i) LOOP(a[i], b[i])
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#endif
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i = len >> 3;
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if (i) {
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for (;;) {
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RC4_LOOP(in, out, 0);
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RC4_LOOP(in, out, 1);
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RC4_LOOP(in, out, 2);
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RC4_LOOP(in, out, 3);
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RC4_LOOP(in, out, 4);
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RC4_LOOP(in, out, 5);
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RC4_LOOP(in, out, 6);
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RC4_LOOP(in, out, 7);
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#ifdef RC4_INDEX
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in += 8;
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out += 8;
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#endif
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if (--i == 0) {
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break;
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}
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}
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}
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i = len & 0x07;
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if (i) {
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for (;;) {
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RC4_LOOP(in, out, 0);
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if (--i == 0) {
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break;
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}
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RC4_LOOP(in, out, 1);
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if (--i == 0) {
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break;
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}
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RC4_LOOP(in, out, 2);
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if (--i == 0) {
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break;
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}
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RC4_LOOP(in, out, 3);
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if (--i == 0) {
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break;
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}
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RC4_LOOP(in, out, 4);
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if (--i == 0) {
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break;
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}
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RC4_LOOP(in, out, 5);
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if (--i == 0) {
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break;
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}
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RC4_LOOP(in, out, 6);
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if (--i == 0) {
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break;
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}
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}
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}
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key->x = x;
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key->y = y;
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}
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void RC4_set_key(RC4_KEY *rc4key, unsigned len, const uint8_t *key) {
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uint32_t tmp;
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unsigned i, id1, id2;
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uint32_t *d;
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d = &rc4key->data[0];
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rc4key->x = 0;
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rc4key->y = 0;
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id1 = id2 = 0;
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#define SK_LOOP(d, n) \
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{ \
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tmp = d[(n)]; \
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id2 = (key[id1] + tmp + id2) & 0xff; \
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if (++id1 == len) \
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id1 = 0; \
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d[(n)] = d[id2]; \
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d[id2] = tmp; \
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}
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for (i = 0; i < 256; i++) {
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d[i] = i;
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}
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for (i = 0; i < 256; i += 4) {
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SK_LOOP(d, i + 0);
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SK_LOOP(d, i + 1);
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SK_LOOP(d, i + 2);
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SK_LOOP(d, i + 3);
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}
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}
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#else
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/* In this case several functions are provided by asm code. However, one cannot
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* control asm symbol visibility with command line flags and such so they are
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* always hidden and wrapped by these C functions, which can be so
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* controlled. */
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void asm_RC4(RC4_KEY *key, size_t len, const uint8_t *in, uint8_t *out);
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void RC4(RC4_KEY *key, size_t len, const uint8_t *in, uint8_t *out) {
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asm_RC4(key, len, in, out);
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}
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void asm_RC4_set_key(RC4_KEY *rc4key, unsigned len, const uint8_t *key);
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void RC4_set_key(RC4_KEY *rc4key, unsigned len, const uint8_t *key) {
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asm_RC4_set_key(rc4key, len, key);
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}
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#endif /* OPENSSL_NO_ASM || (!OPENSSL_X86_64 && !OPENSSL_X86) */
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