Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/utf8/der_decode_utf8_string.c @ 1810:1b160ed94749
fuzz: don't push wrapfd descriptors larger than needed
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 08 Mar 2021 21:59:10 +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 |
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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; |
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104 } |
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105 *outlen = y; |
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106 |
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107 return err; |
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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: $Format:%ai$ */ |