Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file der_encode_object_identifier.c
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13 ASN.1 DER, Encode Object Identifier, Tom St Denis
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14 */
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15
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16 #ifdef LTC_DER
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17 /**
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18 Encode an OID
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19 @param words The words to encode (upto 32-bits each)
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20 @param nwords The number of words in the OID
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21 @param out [out] Destination of OID data
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22 @param outlen [in/out] The max and resulting size of the OID
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23 @return CRYPT_OK if successful
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24 */
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25 int der_encode_object_identifier(unsigned long *words, unsigned long nwords,
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26 unsigned char *out, unsigned long *outlen)
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27 {
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28 unsigned long i, x, y, z, t, mask, wordbuf;
285
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29 int err;
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30
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31 LTC_ARGCHK(words != NULL);
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32 LTC_ARGCHK(out != NULL);
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33 LTC_ARGCHK(outlen != NULL);
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34
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35 /* check length */
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36 if ((err = der_length_object_identifier(words, nwords, &x)) != CRYPT_OK) {
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37 return err;
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38 }
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39 if (x > *outlen) {
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40 *outlen = x;
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41 return CRYPT_BUFFER_OVERFLOW;
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42 }
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43
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44 /* compute length to store OID data */
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45 z = 0;
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46 wordbuf = words[0] * 40 + words[1];
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47 for (y = 1; y < nwords; y++) {
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48 t = der_object_identifier_bits(wordbuf);
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49 z += t/7 + ((t%7) ? 1 : 0) + (wordbuf == 0 ? 1 : 0);
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50 if (y < nwords - 1) {
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51 wordbuf = words[y + 1];
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52 }
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53 }
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54
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55 /* store header + length */
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56 x = 0;
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57 out[x++] = 0x06;
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58 if (z < 128) {
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59 out[x++] = (unsigned char)z;
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60 } else if (z < 256) {
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61 out[x++] = 0x81;
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62 out[x++] = (unsigned char)z;
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63 } else if (z < 65536UL) {
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64 out[x++] = 0x82;
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65 out[x++] = (unsigned char)((z>>8)&255);
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66 out[x++] = (unsigned char)(z&255);
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67 } else {
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68 return CRYPT_INVALID_ARG;
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69 }
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70
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71 /* store first byte */
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72 wordbuf = words[0] * 40 + words[1];
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73 for (i = 1; i < nwords; i++) {
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74 /* store 7 bit words in little endian */
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75 t = wordbuf & 0xFFFFFFFF;
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76 if (t) {
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77 y = x;
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78 mask = 0;
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79 while (t) {
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80 out[x++] = (unsigned char)((t & 0x7F) | mask);
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81 t >>= 7;
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82 mask |= 0x80; /* upper bit is set on all but the last byte */
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83 }
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84 /* now swap bytes y...x-1 */
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85 z = x - 1;
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86 while (y < z) {
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87 t = out[y]; out[y] = out[z]; out[z] = (unsigned char)t;
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88 ++y;
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89 --z;
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90 }
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91 } else {
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92 /* zero word */
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93 out[x++] = 0x00;
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94 }
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95
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96 if (i < nwords - 1) {
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97 wordbuf = words[i + 1];
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98 }
285
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99 }
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100
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101 *outlen = x;
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102 return CRYPT_OK;
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103 }
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104
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105 #endif
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106
1471
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107 /* ref: $Format:%D$ */
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108 /* git commit: $Format:%H$ */
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109 /* commit time: $Format:%ai$ */