Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.c @ 405:00703f1df67a

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Remove extraneous tests in random mpint generation, courtesy of Klocwork
author Matt Johnston <matt@ucc.asn.au>
date Sat, 03 Feb 2007 13:23:18 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
285
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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.org
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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_object_identifier.c
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15 ASN.1 DER, Encode Object Identifier, 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 Encode an OID
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21 @param words The words to encode (upto 32-bits each)
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22 @param nwords The number of words in the OID
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23 @param out [out] Destination of OID data
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24 @param outlen [in/out] The max and resulting size of the OID
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25 @return CRYPT_OK if successful
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26 */
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27 int der_encode_object_identifier(unsigned long *words, unsigned long nwords,
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28 unsigned char *out, unsigned long *outlen)
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29 {
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30 unsigned long i, x, y, z, t, mask;
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31 int err;
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32
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33 LTC_ARGCHK(words != NULL);
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34 LTC_ARGCHK(out != NULL);
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35 LTC_ARGCHK(outlen != NULL);
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36
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37 /* check length */
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38 if ((err = der_length_object_identifier(words, nwords, &x)) != CRYPT_OK) {
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39 return err;
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40 }
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41 if (x > *outlen) {
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42 return CRYPT_BUFFER_OVERFLOW;
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43 }
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44
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45 /* compute length to store OID data */
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46 z = 1;
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47 for (y = 2; y < nwords; y++) {
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48 t = der_object_identifier_bits(words[y]);
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49 z += t/7 + ((t%7) ? 1 : 0);
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50 }
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51
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52 /* store header + length */
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53 x = 0;
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54 out[x++] = 0x06;
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55 if (z < 128) {
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56 out[x++] = z;
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57 } else if (z < 256) {
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58 out[x++] = 0x81;
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59 out[x++] = z;
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60 } else if (z < 65536UL) {
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61 out[x++] = 0x82;
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62 out[x++] = (z>>8)&255;
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63 out[x++] = z&255;
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64 } else {
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65 return CRYPT_INVALID_ARG;
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66 }
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67
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68 /* store first byte */
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69 out[x++] = words[0] * 40 + words[1];
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70
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71 for (i = 2; i < nwords; i++) {
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72 /* store 7 bit words in little endian */
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73 t = words[i] & 0xFFFFFFFF;
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74 if (t) {
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75 y = x;
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76 mask = 0;
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77 while (t) {
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78 out[x++] = (t & 0x7F) | mask;
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79 t >>= 7;
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80 mask |= 0x80; /* upper bit is set on all but the last byte */
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81 }
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82 /* now swap bytes y...x-1 */
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83 z = x - 1;
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84 while (y < z) {
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85 t = out[y]; out[y] = out[z]; out[z] = t;
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86 ++y;
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87 --z;
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88 }
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89 } else {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 /* zero word */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 out[x++] = 0x00;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 *outlen = x;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.c,v $ */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 /* $Revision: 1.1 $ */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 /* $Date: 2005/05/16 15:08:11 $ */