Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_encode.c @ 1934:83b6a47759a8

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Add m_snprintf() that won't return negative
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 12:10:48 +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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16
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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: $Format:%ai$ */