Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_encode.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +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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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: $Format:%ai$ */