Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_encode.c @ 1333:6fafb500de88

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reduce buf->pos if shrinking
author Matt Johnston <matt@ucc.asn.au>
date Sat, 13 May 2017 23:43:09 +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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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 $ */