Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_encode.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file base64_encode.c
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13 Compliant base64 encoder donated by Wayne Scott ([email protected])
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14 base64 URL Safe variant (RFC 4648 section 5) by Karel Miko
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15 */
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17
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18 #if defined(LTC_BASE64) || defined (LTC_BASE64_URL)
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19
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20 #if defined(LTC_BASE64)
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21 static const char * const codes_base64 =
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22 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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23 #endif /* LTC_BASE64 */
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24
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25 #if defined(LTC_BASE64_URL)
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26 static const char * const codes_base64url =
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27 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
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28 #endif /* LTC_BASE64_URL */
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29
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30 static int _base64_encode_internal(const unsigned char *in, unsigned long inlen,
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31 unsigned char *out, unsigned long *outlen,
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32 const char *codes, int pad)
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33 {
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34 unsigned long i, len2, leven;
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35 unsigned char *p;
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36
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37 LTC_ARGCHK(in != NULL);
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38 LTC_ARGCHK(out != NULL);
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39 LTC_ARGCHK(outlen != NULL);
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40
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41 /* valid output size ? */
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42 len2 = 4 * ((inlen + 2) / 3);
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43 if (*outlen < len2 + 1) {
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44 *outlen = len2 + 1;
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45 return CRYPT_BUFFER_OVERFLOW;
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46 }
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47 p = out;
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48 leven = 3*(inlen / 3);
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49 for (i = 0; i < leven; i += 3) {
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50 *p++ = codes[(in[0] >> 2) & 0x3F];
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51 *p++ = codes[(((in[0] & 3) << 4) + (in[1] >> 4)) & 0x3F];
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52 *p++ = codes[(((in[1] & 0xf) << 2) + (in[2] >> 6)) & 0x3F];
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53 *p++ = codes[in[2] & 0x3F];
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54 in += 3;
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55 }
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56 /* Pad it if necessary... */
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57 if (i < inlen) {
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58 unsigned a = in[0];
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59 unsigned b = (i+1 < inlen) ? in[1] : 0;
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60
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61 *p++ = codes[(a >> 2) & 0x3F];
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62 *p++ = codes[(((a & 3) << 4) + (b >> 4)) & 0x3F];
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63 if (pad) {
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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 else {
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68 if (i+1 < inlen) *p++ = codes[(((b & 0xf) << 2)) & 0x3F];
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69 }
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70 }
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71
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72 /* append a NULL byte */
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73 *p = '\0';
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74
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75 /* return ok */
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76 *outlen = (unsigned long)(p - out);
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77 return CRYPT_OK;
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78 }
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79
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80 #if defined(LTC_BASE64)
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81 /**
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82 base64 Encode a buffer (NUL terminated)
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83 @param in The input buffer to encode
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84 @param inlen The length of the input buffer
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85 @param out [out] The destination of the base64 encoded data
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86 @param outlen [in/out] The max size and resulting size
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87 @return CRYPT_OK if successful
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88 */
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89 int base64_encode(const unsigned char *in, unsigned long inlen,
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90 unsigned char *out, unsigned long *outlen)
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91 {
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92 return _base64_encode_internal(in, inlen, out, outlen, codes_base64, 1);
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93 }
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94 #endif /* LTC_BASE64 */
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95
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96
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97 #if defined(LTC_BASE64_URL)
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98 /**
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99 base64 (URL Safe, RFC 4648 section 5) Encode a buffer (NUL terminated)
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100 @param in The input buffer to encode
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101 @param inlen The length of the input buffer
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102 @param out [out] The destination of the base64 encoded data
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103 @param outlen [in/out] The max size and resulting size
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104 @return CRYPT_OK if successful
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105 */
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106 int base64url_encode(const unsigned char *in, unsigned long inlen,
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107 unsigned char *out, unsigned long *outlen)
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108 {
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109 return _base64_encode_internal(in, inlen, out, outlen, codes_base64url, 0);
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110 }
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111
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112 int base64url_strict_encode(const unsigned char *in, unsigned long inlen,
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113 unsigned char *out, unsigned long *outlen)
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114 {
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115 return _base64_encode_internal(in, inlen, out, outlen, codes_base64url, 1);
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116 }
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117 #endif /* LTC_BASE64_URL */
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118
285
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119 #endif
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120
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121
1471
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122 /* ref: $Format:%D$ */
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123 /* git commit: $Format:%H$ */
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124 /* commit time: $Format:%ai$ */