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1 /* crypto/rc2/rc2cfb64.c */ |
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2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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3 * All rights reserved. |
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4 * |
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5 * This package is an SSL implementation written |
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6 * by Eric Young (eay@cryptsoft.com). |
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7 * The implementation was written so as to conform with Netscapes SSL. |
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8 * |
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9 * This library is free for commercial and non-commercial use as long as |
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10 * the following conditions are aheared to. The following conditions |
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11 * apply to all code found in this distribution, be it the RC4, RSA, |
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12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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13 * included with this distribution is covered by the same copyright terms |
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14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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15 * |
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16 * Copyright remains Eric Young's, and as such any Copyright notices in |
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17 * the code are not to be removed. |
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18 * If this package is used in a product, Eric Young should be given attribution |
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19 * as the author of the parts of the library used. |
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20 * This can be in the form of a textual message at program startup or |
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21 * in documentation (online or textual) provided with the package. |
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22 * |
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23 * Redistribution and use in source and binary forms, with or without |
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24 * modification, are permitted provided that the following conditions |
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25 * are met: |
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26 * 1. Redistributions of source code must retain the copyright |
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27 * notice, this list of conditions and the following disclaimer. |
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28 * 2. Redistributions in binary form must reproduce the above copyright |
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29 * notice, this list of conditions and the following disclaimer in the |
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30 * documentation and/or other materials provided with the distribution. |
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31 * 3. All advertising materials mentioning features or use of this software |
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32 * must display the following acknowledgement: |
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33 * "This product includes cryptographic software written by |
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34 * Eric Young (eay@cryptsoft.com)" |
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35 * The word 'cryptographic' can be left out if the rouines from the library |
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36 * being used are not cryptographic related :-). |
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37 * 4. If you include any Windows specific code (or a derivative thereof) from |
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38 * the apps directory (application code) you must include an acknowledgement: |
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39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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40 * |
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41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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51 * SUCH DAMAGE. |
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52 * |
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53 * The licence and distribution terms for any publically available version or |
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54 * derivative of this code cannot be changed. i.e. this code cannot simply be |
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55 * copied and put under another distribution licence |
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56 * [including the GNU Public Licence.] |
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57 */ |
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58 |
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59 #include <openssl/rc2.h> |
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60 #include "rc2_locl.h" |
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61 |
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62 /* The input and output encrypted as though 64bit cfb mode is being |
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63 * used. The extra state information to record how much of the |
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64 * 64bit block we have used is contained in *num; |
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65 */ |
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66 |
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67 EXPORT_C void RC2_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
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68 long length, RC2_KEY *schedule, unsigned char *ivec, |
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69 int *num, int encrypt) |
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70 { |
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71 register unsigned long v0,v1,t; |
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72 register int n= *num; |
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73 register long l=length; |
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74 unsigned long ti[2]; |
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75 unsigned char *iv,c,cc; |
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76 |
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77 iv=(unsigned char *)ivec; |
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78 if (encrypt) |
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79 { |
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80 while (l--) |
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81 { |
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82 if (n == 0) |
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83 { |
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84 c2l(iv,v0); ti[0]=v0; |
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85 c2l(iv,v1); ti[1]=v1; |
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86 RC2_encrypt((unsigned long *)ti,schedule); |
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87 iv=(unsigned char *)ivec; |
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88 t=ti[0]; l2c(t,iv); |
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89 t=ti[1]; l2c(t,iv); |
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90 iv=(unsigned char *)ivec; |
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91 } |
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92 c= *(in++)^iv[n]; |
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93 *(out++)=c; |
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94 iv[n]=c; |
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95 n=(n+1)&0x07; |
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96 } |
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97 } |
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98 else |
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99 { |
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100 while (l--) |
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101 { |
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102 if (n == 0) |
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103 { |
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104 c2l(iv,v0); ti[0]=v0; |
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105 c2l(iv,v1); ti[1]=v1; |
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106 RC2_encrypt((unsigned long *)ti,schedule); |
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107 iv=(unsigned char *)ivec; |
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108 t=ti[0]; l2c(t,iv); |
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109 t=ti[1]; l2c(t,iv); |
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110 iv=(unsigned char *)ivec; |
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111 } |
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112 cc= *(in++); |
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113 c=iv[n]; |
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114 iv[n]=cc; |
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115 *(out++)=c^cc; |
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116 n=(n+1)&0x07; |
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117 } |
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118 } |
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119 v0=v1=ti[0]=ti[1]=t=c=cc=0; |
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120 *num=n; |
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121 } |
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122 |