Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/utf8/der_decode_utf8_string.c @ 1857:6022df862942
Use DSCP for IP QoS traffic classes
The previous TOS values are deprecated and not used by modern traffic
classifiers. This sets AF21 for "interactive" traffic (with a tty).
Non-tty traffic sets AF11 - that indicates high throughput but is not
lowest priority (which would be CS1 or LE).
This differs from the CS1 used by OpenSSH, it lets interactive git over SSH
have higher priority than background least effort traffic. Dropbear's settings
here should be suitable with the diffservs used by CAKE qdisc.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 25 Jan 2022 17:32:20 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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382
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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 der_decode_utf8_string.c |
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13 ASN.1 DER, encode a UTF8 STRING, Tom St Denis |
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14 */ |
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15 |
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16 |
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17 #ifdef LTC_DER |
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18 |
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19 /** |
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20 Store a UTF8 STRING |
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21 @param in The DER encoded UTF8 STRING |
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22 @param inlen The size of the DER UTF8 STRING |
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23 @param out [out] The array of utf8s stored (one per char) |
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24 @param outlen [in/out] The number of utf8s stored |
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25 @return CRYPT_OK if successful |
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26 */ |
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27 int der_decode_utf8_string(const unsigned char *in, unsigned long inlen, |
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28 wchar_t *out, unsigned long *outlen) |
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29 { |
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30 wchar_t tmp; |
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31 unsigned long x, y, z, len; |
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32 int err; |
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33 |
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34 LTC_ARGCHK(in != NULL); |
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35 LTC_ARGCHK(out != NULL); |
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36 LTC_ARGCHK(outlen != NULL); |
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37 |
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38 /* must have header at least */ |
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39 if (inlen < 2) { |
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40 return CRYPT_INVALID_PACKET; |
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41 } |
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42 |
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43 /* check for 0x0C */ |
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44 if ((in[0] & 0x1F) != 0x0C) { |
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45 return CRYPT_INVALID_PACKET; |
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46 } |
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47 x = 1; |
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48 |
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49 /* decode the length */ |
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50 if (in[x] & 0x80) { |
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51 /* valid # of bytes in length are 1,2,3 */ |
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52 y = in[x] & 0x7F; |
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53 if ((y == 0) || (y > 3) || ((x + y) > inlen)) { |
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54 return CRYPT_INVALID_PACKET; |
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55 } |
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56 |
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57 /* read the length in */ |
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58 len = 0; |
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59 ++x; |
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60 while (y--) { |
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61 len = (len << 8) | in[x++]; |
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62 } |
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63 } else { |
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64 len = in[x++] & 0x7F; |
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65 } |
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66 |
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67 if (len + x > inlen) { |
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68 return CRYPT_INVALID_PACKET; |
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69 } |
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70 |
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71 /* proceed to decode */ |
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72 for (y = 0; x < inlen; ) { |
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73 /* get first byte */ |
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74 tmp = in[x++]; |
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75 |
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76 /* count number of bytes */ |
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77 for (z = 0; (tmp & 0x80) && (z <= 4); z++, tmp = (tmp << 1) & 0xFF); |
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78 |
382
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79 if (z > 4 || (x + (z - 1) > inlen)) { |
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80 return CRYPT_INVALID_PACKET; |
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81 } |
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82 |
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83 /* decode, grab upper bits */ |
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84 tmp >>= z; |
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85 |
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86 /* grab remaining bytes */ |
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87 if (z > 1) { --z; } |
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88 while (z-- != 0) { |
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89 if ((in[x] & 0xC0) != 0x80) { |
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90 return CRYPT_INVALID_PACKET; |
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91 } |
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92 tmp = (tmp << 6) | ((wchar_t)in[x++] & 0x3F); |
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93 } |
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94 |
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95 if (y < *outlen) { |
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96 out[y] = tmp; |
382
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97 } |
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98 y++; |
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99 } |
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100 if (y > *outlen) { |
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101 err = CRYPT_BUFFER_OVERFLOW; |
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102 } else { |
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103 err = CRYPT_OK; |
382
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104 } |
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105 *outlen = y; |
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106 |
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107 return err; |
382
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108 } |
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109 |
382
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110 #endif |
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111 |
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112 /* ref: $Format:%D$ */ |
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113 /* git commit: $Format:%H$ */ |
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114 /* commit time: $Format:%ai$ */ |