Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/utf8/der_length_utf8_string.c @ 766:d1575fdc29a6 ecc

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start on ecdsa keys
author Matt Johnston <matt@ucc.asn.au>
date Tue, 09 Apr 2013 00:36:04 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
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_length_utf8_string.c
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15 ASN.1 DER, get length of UTF8 STRING, Tom St Denis
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16 */
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17
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18 #ifdef LTC_DER
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19
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20 /** Return the size in bytes of a UTF-8 character
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21 @param c The UTF-8 character to measure
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22 @return The size in bytes
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23 */
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24 unsigned long der_utf8_charsize(const wchar_t c)
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25 {
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26 if (c <= 0x7F) {
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27 return 1;
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28 } else if (c <= 0x7FF) {
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29 return 2;
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30 } else if (c <= 0xFFFF) {
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31 return 3;
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32 } else {
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33 return 4;
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34 }
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35 }
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36
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37 /**
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38 Gets length of DER encoding of UTF8 STRING
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39 @param in The characters to measure the length of
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40 @param noctets The number of octets in the string to encode
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41 @param outlen [out] The length of the DER encoding for the given string
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42 @return CRYPT_OK if successful
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43 */
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44 int der_length_utf8_string(const wchar_t *in, unsigned long noctets, unsigned long *outlen)
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45 {
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46 unsigned long x, len;
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47
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48 LTC_ARGCHK(in != NULL);
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49 LTC_ARGCHK(outlen != NULL);
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50
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51 len = 0;
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52 for (x = 0; x < noctets; x++) {
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53 if (in[x] < 0 || in[x] > 0x10FFFF) {
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54 return CRYPT_INVALID_ARG;
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55 }
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56 len += der_utf8_charsize(in[x]);
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57 }
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58
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59 if (len < 128) {
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60 /* 0C LL DD DD DD ... */
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61 *outlen = 2 + len;
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62 } else if (len < 256) {
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63 /* 0C 81 LL DD DD DD ... */
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64 *outlen = 3 + len;
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65 } else if (len < 65536UL) {
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66 /* 0C 82 LL LL DD DD DD ... */
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67 *outlen = 4 + len;
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68 } else if (len < 16777216UL) {
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69 /* 0C 83 LL LL LL DD DD DD ... */
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70 *outlen = 5 + len;
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71 } else {
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72 return CRYPT_INVALID_ARG;
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73 }
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74
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75 return CRYPT_OK;
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76 }
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77
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78 #endif
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79
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80
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81 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utf8/der_length_utf8_string.c,v $ */
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82 /* $Revision: 1.5 $ */
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83 /* $Date: 2006/12/16 17:41:21 $ */