Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c @ 994:5c5ade336926
Prefer stronger algorithms in algorithm negotiation.
Prefer diffie-hellman-group14-sha1 (2048 bit) over
diffie-hellman-group1-sha1 (1024 bit).
Due to meet-in-the-middle attacks the effective key length of
three key 3DES is 112 bits. AES is stronger and faster then 3DES.
Prefer to delay the start of compression until after authentication
has completed. This avoids exposing compression code to attacks
from unauthenticated users.
(github pull request #9)
author | Fedor Brunner <fedor.brunner@azet.sk> |
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date | Fri, 23 Jan 2015 23:00:25 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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 * 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 $ */ |