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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 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file der_encode_utf8_string.c |
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15 ASN.1 DER, encode a UTF8 STRING, Tom St Denis |
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16 */ |
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17 |
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18 |
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19 #ifdef LTC_DER |
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20 |
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21 /** |
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22 Store an UTF8 STRING |
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23 @param in The array of UTF8 to store (one per wchar_t) |
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24 @param inlen The number of UTF8 to store |
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25 @param out [out] The destination for the DER encoded UTF8 STRING |
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26 @param outlen [in/out] The max size and resulting size of the DER UTF8 STRING |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int der_encode_utf8_string(const wchar_t *in, unsigned long inlen, |
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30 unsigned char *out, unsigned long *outlen) |
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31 { |
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32 unsigned long x, y, len; |
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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 /* get the size */ |
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39 for (x = len = 0; x < inlen; x++) { |
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40 if (in[x] < 0 || in[x] > 0x1FFFF) { |
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41 return CRYPT_INVALID_ARG; |
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42 } |
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43 len += der_utf8_charsize(in[x]); |
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44 } |
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45 |
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46 if (len < 128) { |
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47 y = 2 + len; |
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48 } else if (len < 256) { |
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49 y = 3 + len; |
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50 } else if (len < 65536UL) { |
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51 y = 4 + len; |
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52 } else if (len < 16777216UL) { |
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53 y = 5 + len; |
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54 } else { |
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55 return CRYPT_INVALID_ARG; |
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56 } |
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57 |
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58 /* too big? */ |
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59 if (y > *outlen) { |
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60 *outlen = len; |
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61 return CRYPT_BUFFER_OVERFLOW; |
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62 } |
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63 |
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64 /* encode the header+len */ |
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65 x = 0; |
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66 out[x++] = 0x0C; |
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67 if (len < 128) { |
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68 out[x++] = len; |
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69 } else if (len < 256) { |
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70 out[x++] = 0x81; |
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71 out[x++] = len; |
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72 } else if (len < 65536UL) { |
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73 out[x++] = 0x82; |
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74 out[x++] = (len>>8)&255; |
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75 out[x++] = len&255; |
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76 } else if (len < 16777216UL) { |
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77 out[x++] = 0x83; |
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78 out[x++] = (len>>16)&255; |
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79 out[x++] = (len>>8)&255; |
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80 out[x++] = len&255; |
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81 } else { |
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82 return CRYPT_INVALID_ARG; |
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83 } |
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84 |
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85 /* store UTF8 */ |
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86 for (y = 0; y < inlen; y++) { |
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87 switch (der_utf8_charsize(in[y])) { |
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88 case 1: out[x++] = in[y]; break; |
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89 case 2: out[x++] = 0xC0 | ((in[y] >> 6) & 0x1F); out[x++] = 0x80 | (in[y] & 0x3F); break; |
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90 case 3: out[x++] = 0xE0 | ((in[y] >> 12) & 0x0F); out[x++] = 0x80 | ((in[y] >> 6) & 0x3F); out[x++] = 0x80 | (in[y] & 0x3F); break; |
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91 case 4: out[x++] = 0xF0 | ((in[y] >> 18) & 0x07); out[x++] = 0x80 | ((in[y] >> 12) & 0x3F); out[x++] = 0x80 | ((in[y] >> 6) & 0x3F); out[x++] = 0x80 | (in[y] & 0x3F); break; |
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92 } |
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93 } |
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94 |
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95 /* retun length */ |
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96 *outlen = x; |
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97 |
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98 return CRYPT_OK; |
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99 } |
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100 |
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101 #endif |
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102 |
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103 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c,v $ */ |
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104 /* $Revision: 1.7 $ */ |
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105 /* $Date: 2006/12/16 17:41:21 $ */ |
