Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_decode.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 d885a77b98e0
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,
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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
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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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Matt Johnston <matt@ucc.asn.au>
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diff changeset
95 continue;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
96 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
99 return CRYPT_INVALID_PACKET;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
100 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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diff changeset
103 return CRYPT_INVALID_PACKET;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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104 else
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
105 continue;
285
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parents:
diff changeset
106 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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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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diff changeset
109
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
110 if (++y == 4) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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111 if (z + 3 > *outlen) return CRYPT_BUFFER_OVERFLOW;
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
112 out[z++] = (unsigned char)((t>>16)&255);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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113 out[z++] = (unsigned char)((t>>8)&255);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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114 out[z++] = (unsigned char)(t&255);
285
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parents:
diff changeset
115 y = t = 0;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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116 }
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117 }
1471
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118
285
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diff changeset
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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diff changeset
123 allow_b64url = 1;
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diff changeset
124 }
d885a77b98e0 avoid zero length array in base64_decode
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diff changeset
125 #endif
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
126 if (y == 1) return CRYPT_INVALID_PACKET;
1712
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127 if ((y + g) != 4 && is_strict && !allow_b64url) return CRYPT_INVALID_PACKET;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
128 t = t << (6 * (4 - y));
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diff changeset
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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diff changeset
132 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
133 *outlen = z;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
134 return CRYPT_OK;
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parents:
diff changeset
135 }
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136
1471
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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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diff changeset
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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diff changeset
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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diff changeset
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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diff changeset
162 {
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diff changeset
163 return _base64_decode_internal(in, inlen, out, outlen, map_base64, strict);
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164 }
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diff changeset
165 #endif /* LTC_BASE64 */
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diff changeset
166
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167 #if defined(LTC_BASE64_URL)
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diff changeset
168 /**
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169 Relaxed base64 (URL Safe, RFC 4648 section 5) decode a block of memory
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diff changeset
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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diff changeset
173 @param outlen [in/out] The max size and resulting size of the decoded data
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diff changeset
174 @return CRYPT_OK if successful
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diff changeset
175 */
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diff changeset
176 int base64url_decode(const unsigned char *in, unsigned long inlen,
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diff changeset
177 unsigned char *out, unsigned long *outlen)
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diff changeset
178 {
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diff changeset
179 return _base64_decode_internal(in, inlen, out, outlen, map_base64url, relaxed);
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180 }
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diff changeset
181
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
182 /**
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183 Strict base64 (URL Safe, RFC 4648 section 5) decode a block of memory
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diff changeset
184 @param in The base64 data to decode
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diff changeset
185 @param inlen The length of the base64 data
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diff changeset
186 @param out [out] The destination of the binary decoded data
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diff changeset
187 @param outlen [in/out] The max size and resulting size of the decoded data
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diff changeset
188 @return CRYPT_OK if successful
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diff changeset
189 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
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 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
193 return _base64_decode_internal(in, inlen, out, outlen, map_base64url, strict);
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diff changeset
194 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
195 #endif /* LTC_BASE64_URL */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
196
285
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diff changeset
197 #endif
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diff changeset
198
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
199
1471
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diff changeset
200 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
201 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
202 /* commit time: $Format:%ai$ */