Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c @ 1590:68d5d8e84a92

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notes on the fuzzer
author Matt Johnston <matt@ucc.asn.au>
date Mon, 05 Mar 2018 14:07:11 +0800
parents 6dba84798cd5
children
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file der_encode_utf8_string.c
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13 ASN.1 DER, encode a UTF8 STRING, Tom St Denis
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14 */
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15
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16
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17 #ifdef LTC_DER
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18
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19 /**
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20 Store an UTF8 STRING
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21 @param in The array of UTF8 to store (one per wchar_t)
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22 @param inlen The number of UTF8 to store
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23 @param out [out] The destination for the DER encoded UTF8 STRING
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24 @param outlen [in/out] The max size and resulting size of the DER UTF8 STRING
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25 @return CRYPT_OK if successful
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26 */
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27 int der_encode_utf8_string(const wchar_t *in, unsigned long inlen,
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28 unsigned char *out, unsigned long *outlen)
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29 {
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30 unsigned long x, y, len;
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(out != NULL);
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34 LTC_ARGCHK(outlen != NULL);
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35
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36 /* get the size */
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37 for (x = len = 0; x < inlen; x++) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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38 if (!der_utf8_valid_char(in[x])) return CRYPT_INVALID_ARG;
382
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39 len += der_utf8_charsize(in[x]);
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40 }
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41
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42 if (len < 128) {
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43 y = 2 + len;
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44 } else if (len < 256) {
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45 y = 3 + len;
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46 } else if (len < 65536UL) {
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47 y = 4 + len;
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48 } else if (len < 16777216UL) {
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49 y = 5 + len;
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50 } else {
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51 return CRYPT_INVALID_ARG;
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52 }
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53
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54 /* too big? */
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55 if (y > *outlen) {
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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56 *outlen = y;
382
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57 return CRYPT_BUFFER_OVERFLOW;
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58 }
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59
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60 /* encode the header+len */
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61 x = 0;
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62 out[x++] = 0x0C;
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63 if (len < 128) {
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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parents: 382
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64 out[x++] = (unsigned char)len;
382
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65 } else if (len < 256) {
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66 out[x++] = 0x81;
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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parents: 382
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67 out[x++] = (unsigned char)len;
382
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68 } else if (len < 65536UL) {
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69 out[x++] = 0x82;
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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parents: 382
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70 out[x++] = (unsigned char)((len>>8)&255);
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
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71 out[x++] = (unsigned char)(len&255);
382
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72 } else if (len < 16777216UL) {
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diff changeset
73 out[x++] = 0x83;
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
74 out[x++] = (unsigned char)((len>>16)&255);
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
75 out[x++] = (unsigned char)((len>>8)&255);
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
76 out[x++] = (unsigned char)(len&255);
382
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77 } else {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
78 /* coverity[dead_error_line] */
382
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79 return CRYPT_INVALID_ARG;
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80 }
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parents:
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81
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parents:
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82 /* store UTF8 */
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parents:
diff changeset
83 for (y = 0; y < inlen; y++) {
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parents:
diff changeset
84 switch (der_utf8_charsize(in[y])) {
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
85 case 1: out[x++] = (unsigned char)in[y]; break;
382
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parents:
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86 case 2: out[x++] = 0xC0 | ((in[y] >> 6) & 0x1F); out[x++] = 0x80 | (in[y] & 0x3F); break;
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Matt Johnston <matt@ucc.asn.au>
parents:
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87 case 3: out[x++] = 0xE0 | ((in[y] >> 12) & 0x0F); out[x++] = 0x80 | ((in[y] >> 6) & 0x3F); out[x++] = 0x80 | (in[y] & 0x3F); break;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
88 #if !defined(LTC_WCHAR_MAX) || LTC_WCHAR_MAX > 0xFFFF
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 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;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
90 #endif
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 }
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 /* retun length */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 *outlen = x;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 return CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 }
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 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
102 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
103 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
104 /* commit time: $Format:%ai$ */