Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_encode.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +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: $Format:%ai$ */