BadVPN – Blame information for rev 1
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| Rev | Author | Line No. | Line |
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| 1 | office | 1 | /* |
| 2 | * An implementation of the ARCFOUR algorithm |
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| 3 | * |
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| 4 | * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine |
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| 5 | * |
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| 6 | * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org> |
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| 7 | * |
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| 8 | * All rights reserved. |
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| 9 | * |
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| 10 | * Redistribution and use in source and binary forms, with or without |
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| 11 | * modification, are permitted provided that the following conditions |
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| 12 | * are met: |
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| 13 | * |
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| 14 | * * Redistributions of source code must retain the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer. |
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| 16 | * * Redistributions in binary form must reproduce the above copyright |
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| 17 | * notice, this list of conditions and the following disclaimer in the |
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| 18 | * documentation and/or other materials provided with the distribution. |
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| 19 | * * Neither the names of PolarSSL or XySSL nor the names of its contributors |
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| 20 | * may be used to endorse or promote products derived from this software |
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| 21 | * without specific prior written permission. |
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| 22 | * |
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 24 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 25 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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| 26 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| 27 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 28 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
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| 29 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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| 30 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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| 31 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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| 32 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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| 33 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 34 | */ |
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| 35 | /* |
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| 36 | * The ARCFOUR algorithm was publicly disclosed on 94/09. |
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| 37 | * |
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| 38 | * http://groups.google.com/group/sci.crypt/msg/10a300c9d21afca0 |
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| 39 | */ |
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| 40 | |||
| 41 | #include "netif/ppp/ppp_opts.h" |
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| 42 | #if PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_ARC4 |
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| 43 | |||
| 44 | #include "netif/ppp/polarssl/arc4.h" |
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| 45 | /* |
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| 46 | * ARC4 key schedule |
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| 47 | */ |
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| 48 | void arc4_setup( arc4_context *ctx, unsigned char *key, int keylen ) |
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| 49 | { |
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| 50 | int i, j, k, a; |
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| 51 | unsigned char *m; |
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| 52 | |||
| 53 | ctx->x = 0; |
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| 54 | ctx->y = 0; |
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| 55 | m = ctx->m; |
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| 56 | |||
| 57 | for( i = 0; i < 256; i++ ) |
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| 58 | m[i] = (unsigned char) i; |
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| 59 | |||
| 60 | j = k = 0; |
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| 61 | |||
| 62 | for( i = 0; i < 256; i++, k++ ) |
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| 63 | { |
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| 64 | if( k >= keylen ) k = 0; |
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| 65 | |||
| 66 | a = m[i]; |
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| 67 | j = ( j + a + key[k] ) & 0xFF; |
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| 68 | m[i] = m[j]; |
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| 69 | m[j] = (unsigned char) a; |
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| 70 | } |
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| 71 | } |
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| 72 | |||
| 73 | /* |
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| 74 | * ARC4 cipher function |
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| 75 | */ |
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| 76 | void arc4_crypt( arc4_context *ctx, unsigned char *buf, int buflen ) |
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| 77 | { |
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| 78 | int i, x, y, a, b; |
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| 79 | unsigned char *m; |
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| 80 | |||
| 81 | x = ctx->x; |
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| 82 | y = ctx->y; |
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| 83 | m = ctx->m; |
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| 84 | |||
| 85 | for( i = 0; i < buflen; i++ ) |
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| 86 | { |
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| 87 | x = ( x + 1 ) & 0xFF; a = m[x]; |
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| 88 | y = ( y + a ) & 0xFF; b = m[y]; |
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| 89 | |||
| 90 | m[x] = (unsigned char) b; |
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| 91 | m[y] = (unsigned char) a; |
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| 92 | |||
| 93 | buf[i] = (unsigned char) |
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| 94 | ( buf[i] ^ m[(unsigned char)( a + b )] ); |
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| 95 | } |
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| 96 | |||
| 97 | ctx->x = x; |
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| 98 | ctx->y = y; |
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| 99 | } |
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| 100 | |||
| 101 | #endif /* PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_DES */ |