Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c @ 623:895fbe068f2c

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Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent with the wrong encryption key ("bad packet length" symptom) while key exchange was happening.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 07 Jun 2011 11:55:44 +0000
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_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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Matt Johnston <matt@ucc.asn.au>
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70 out[x++] = 0x81;
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Matt Johnston <matt@ucc.asn.au>
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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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Matt Johnston <matt@ucc.asn.au>
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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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Matt Johnston <matt@ucc.asn.au>
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78 out[x++] = (len>>16)&255;
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Matt Johnston <matt@ucc.asn.au>
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79 out[x++] = (len>>8)&255;
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Matt Johnston <matt@ucc.asn.au>
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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
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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85 /* store UTF8 */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
86 for (y = 0; y < inlen; y++) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 switch (der_utf8_charsize(in[y])) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 case 1: out[x++] = in[y]; break;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 case 2: out[x++] = 0xC0 | ((in[y] >> 6) & 0x1F); out[x++] = 0x80 | (in[y] & 0x3F); break;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 case 3: out[x++] = 0xE0 | ((in[y] >> 12) & 0x0F); out[x++] = 0x80 | ((in[y] >> 6) & 0x3F); out[x++] = 0x80 | (in[y] & 0x3F); break;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
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;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 /* retun length */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 *outlen = x;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 return CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c,v $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 /* $Revision: 1.7 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 /* $Date: 2006/12/16 17:41:21 $ */