Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_encode.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file base64_encode.c
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15 Compliant base64 encoder donated by Wayne Scott ([email protected])
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16 */
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19 #ifdef BASE64
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20
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21 static const char *codes =
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22 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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24 /**
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25 base64 Encode a buffer (NUL terminated)
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26 @param in The input buffer to encode
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27 @param inlen The length of the input buffer
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28 @param out [out] The destination of the base64 encoded data
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29 @param outlen [in/out] The max size and resulting size
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30 @return CRYPT_OK if successful
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31 */
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32 int base64_encode(const unsigned char *in, unsigned long inlen,
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33 unsigned char *out, unsigned long *outlen)
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34 {
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35 unsigned long i, len2, leven;
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36 unsigned char *p;
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37
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38 LTC_ARGCHK(in != NULL);
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39 LTC_ARGCHK(out != NULL);
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40 LTC_ARGCHK(outlen != NULL);
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41
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42 /* valid output size ? */
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43 len2 = 4 * ((inlen + 2) / 3);
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44 if (*outlen < len2 + 1) {
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45 *outlen = len2 + 1;
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46 return CRYPT_BUFFER_OVERFLOW;
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47 }
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48 p = out;
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49 leven = 3*(inlen / 3);
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50 for (i = 0; i < leven; i += 3) {
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51 *p++ = codes[(in[0] >> 2) & 0x3F];
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52 *p++ = codes[(((in[0] & 3) << 4) + (in[1] >> 4)) & 0x3F];
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53 *p++ = codes[(((in[1] & 0xf) << 2) + (in[2] >> 6)) & 0x3F];
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54 *p++ = codes[in[2] & 0x3F];
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55 in += 3;
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56 }
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57 /* Pad it if necessary... */
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58 if (i < inlen) {
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59 unsigned a = in[0];
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60 unsigned b = (i+1 < inlen) ? in[1] : 0;
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61
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62 *p++ = codes[(a >> 2) & 0x3F];
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63 *p++ = codes[(((a & 3) << 4) + (b >> 4)) & 0x3F];
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64 *p++ = (i+1 < inlen) ? codes[(((b & 0xf) << 2)) & 0x3F] : '=';
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65 *p++ = '=';
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66 }
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67
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68 /* append a NULL byte */
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69 *p = '\0';
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70
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71 /* return ok */
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72 *outlen = p - out;
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73 return CRYPT_OK;
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74 }
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75
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76 #endif
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78
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79 /* $Source: /cvs/libtom/libtomcrypt/src/misc/base64/base64_encode.c,v $ */
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80 /* $Revision: 1.5 $ */
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81 /* $Date: 2006/06/16 21:53:41 $ */