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* The arcfour/rc4 stream cipher.
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/* nettle, low-level cryptographics library
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* Copyright (C) 2001, 2004 Niels M�ller
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* The nettle library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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* The nettle library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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* You should have received a copy of the GNU Lesser General Public License
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* along with the nettle library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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arcfour_crypt(struct arcfour_ctx *ctx,
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unsigned length, uint8_t *dst,
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register uint8_t i, j;
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i = ctx->i; j = ctx->j;
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sj = ctx->S[i] = ctx->S[j];
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*dst++ = *src++ ^ ctx->S[ (si + sj) & 0xff ];
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ctx->i = i; ctx->j = j;