Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_decode.c @ 1712:d885a77b98e0

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avoid zero length array in base64_decode
author Matt Johnston <matt@ucc.asn.au>
date Wed, 10 Jun 2020 23:26:05 +0800
parents 6dba84798cd5
children
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285
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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_decode.c
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13 Compliant base64 code 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 unsigned char map_base64[256] = {
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22 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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23 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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24 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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25 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
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26 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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27 255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
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28 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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29 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
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30 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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31 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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32 49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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33 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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34 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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35 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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36 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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37 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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38 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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39 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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40 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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41 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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42 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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43 255, 255, 255, 255 };
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44 #endif /* LTC_BASE64 */
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45
1712
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46 #if defined(LTC_BASE64_URL)
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47 static const unsigned char map_base64url[] = {
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48 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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49 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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50 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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51 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255,
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52 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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53 255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
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54 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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55 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 63,
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56 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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57 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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58 49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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59 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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60 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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61 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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62 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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63 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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64 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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65 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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66 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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67 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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68 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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69 255, 255, 255, 255
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70 };
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71 #endif /* LTC_BASE64_URL */
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72
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73 enum {
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74 relaxed = 0,
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75 strict = 1
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76 };
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77
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78 static int _base64_decode_internal(const unsigned char *in, unsigned long inlen,
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79 unsigned char *out, unsigned long *outlen,
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80 const unsigned char *map, int is_strict)
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81 {
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82 unsigned long t, x, y, z;
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83 unsigned char c;
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84 int g;
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85
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86 LTC_ARGCHK(in != NULL);
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87 LTC_ARGCHK(out != NULL);
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88 LTC_ARGCHK(outlen != NULL);
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89
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90 g = 0; /* '=' counter */
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91 for (x = y = z = t = 0; x < inlen; x++) {
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92 c = map[in[x]&0xFF];
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93 if (c == 254) {
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94 g++;
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95 continue;
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96 }
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diff changeset
97 else if (is_strict && g > 0) {
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diff changeset
98 /* we only allow '=' to be at the end */
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diff changeset
99 return CRYPT_INVALID_PACKET;
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diff changeset
100 }
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diff changeset
101 if (c == 255) {
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diff changeset
102 if (is_strict)
285
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103 return CRYPT_INVALID_PACKET;
1471
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104 else
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diff changeset
105 continue;
285
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106 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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107
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diff changeset
108 t = (t<<6)|c;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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109
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110 if (++y == 4) {
1471
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111 if (z + 3 > *outlen) return CRYPT_BUFFER_OVERFLOW;
285
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112 out[z++] = (unsigned char)((t>>16)&255);
1471
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113 out[z++] = (unsigned char)((t>>8)&255);
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114 out[z++] = (unsigned char)(t&255);
285
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115 y = t = 0;
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116 }
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117 }
1471
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118
285
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119 if (y != 0) {
1712
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120 int allow_b64url = 0;
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121 #ifdef LTC_BASE64_URL
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122 if (map == map_base64url) {
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123 allow_b64url = 1;
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124 }
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125 #endif
1471
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126 if (y == 1) return CRYPT_INVALID_PACKET;
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127 if ((y + g) != 4 && is_strict && !allow_b64url) return CRYPT_INVALID_PACKET;
1471
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128 t = t << (6 * (4 - y));
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129 if (z + y - 1 > *outlen) return CRYPT_BUFFER_OVERFLOW;
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130 if (y >= 2) out[z++] = (unsigned char) ((t >> 16) & 255);
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131 if (y == 3) out[z++] = (unsigned char) ((t >> 8) & 255);
285
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132 }
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133 *outlen = z;
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134 return CRYPT_OK;
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135 }
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136
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137 #if defined(LTC_BASE64)
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138 /**
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139 Relaxed base64 decode a block of memory
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140 @param in The base64 data to decode
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141 @param inlen The length of the base64 data
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142 @param out [out] The destination of the binary decoded data
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143 @param outlen [in/out] The max size and resulting size of the decoded data
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144 @return CRYPT_OK if successful
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145 */
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146 int base64_decode(const unsigned char *in, unsigned long inlen,
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147 unsigned char *out, unsigned long *outlen)
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148 {
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149 return _base64_decode_internal(in, inlen, out, outlen, map_base64, relaxed);
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150 }
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151
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152 /**
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153 Strict base64 decode a block of memory
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154 @param in The base64 data to decode
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155 @param inlen The length of the base64 data
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156 @param out [out] The destination of the binary decoded data
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157 @param outlen [in/out] The max size and resulting size of the decoded data
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158 @return CRYPT_OK if successful
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159 */
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160 int base64_strict_decode(const unsigned char *in, unsigned long inlen,
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161 unsigned char *out, unsigned long *outlen)
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162 {
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163 return _base64_decode_internal(in, inlen, out, outlen, map_base64, strict);
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164 }
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165 #endif /* LTC_BASE64 */
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166
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167 #if defined(LTC_BASE64_URL)
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168 /**
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169 Relaxed base64 (URL Safe, RFC 4648 section 5) decode a block of memory
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170 @param in The base64 data to decode
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171 @param inlen The length of the base64 data
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172 @param out [out] The destination of the binary decoded data
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173 @param outlen [in/out] The max size and resulting size of the decoded data
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174 @return CRYPT_OK if successful
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175 */
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176 int base64url_decode(const unsigned char *in, unsigned long inlen,
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177 unsigned char *out, unsigned long *outlen)
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178 {
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179 return _base64_decode_internal(in, inlen, out, outlen, map_base64url, relaxed);
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180 }
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181
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182 /**
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183 Strict base64 (URL Safe, RFC 4648 section 5) decode a block of memory
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184 @param in The base64 data to decode
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185 @param inlen The length of the base64 data
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186 @param out [out] The destination of the binary decoded data
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187 @param outlen [in/out] The max size and resulting size of the decoded data
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188 @return CRYPT_OK if successful
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189 */
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190 int base64url_strict_decode(const unsigned char *in, unsigned long inlen,
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diff changeset
191 unsigned char *out, unsigned long *outlen)
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diff changeset
192 {
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diff changeset
193 return _base64_decode_internal(in, inlen, out, outlen, map_base64url, strict);
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194 }
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diff changeset
195 #endif /* LTC_BASE64_URL */
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diff changeset
196
285
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197 #endif
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198
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199
1471
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diff changeset
200 /* ref: $Format:%D$ */
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diff changeset
201 /* git commit: $Format:%H$ */
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diff changeset
202 /* commit time: $Format:%ai$ */