Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/utf8/der_length_utf8_string.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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_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 $ */