Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_encode.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
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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17
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18
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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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23
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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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77
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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 $ */