Mercurial > dropbear

annotate src/pk/asn1/der/integer/der_encode_integer.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16

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Update to LibTomCrypt 1.16
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:22:00 +0000
parents 59400faa4b44
children
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rev   line source
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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_encode_integer.c
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15 ASN.1 DER, encode an integer, 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 /* Exports a positive bignum as DER format (upto 2^32 bytes in size) */
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22 /**
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23 Store a mp_int integer
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24 @param num The first mp_int to encode
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25 @param out [out] The destination for the DER encoded integers
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26 @param outlen [in/out] The max size and resulting size of the DER encoded integers
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27 @return CRYPT_OK if successful
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28 */
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29 int der_encode_integer(void *num, unsigned char *out, unsigned long *outlen)
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30 {
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31 unsigned long tmplen, y;
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32 int err, leading_zero;
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33
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34 LTC_ARGCHK(num != 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 /* find out how big this will be */
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39 if ((err = der_length_integer(num, &tmplen)) != CRYPT_OK) {
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40 return err;
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41 }
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42
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43 if (*outlen < tmplen) {
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44 *outlen = tmplen;
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45 return CRYPT_BUFFER_OVERFLOW;
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46 }
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47
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48 if (mp_cmp_d(num, 0) != LTC_MP_LT) {
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49 /* we only need a leading zero if the msb of the first byte is one */
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50 if ((mp_count_bits(num) & 7) == 0 || mp_iszero(num) == LTC_MP_YES) {
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51 leading_zero = 1;
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52 } else {
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53 leading_zero = 0;
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54 }
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55
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56 /* get length of num in bytes (plus 1 since we force the msbyte to zero) */
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57 y = mp_unsigned_bin_size(num) + leading_zero;
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58 } else {
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59 leading_zero = 0;
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60 y = mp_count_bits(num);
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61 y = y + (8 - (y & 7));
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62 y = y >> 3;
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63 if (((mp_cnt_lsb(num)+1)==mp_count_bits(num)) && ((mp_count_bits(num)&7)==0)) --y;
280
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64 }
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65
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66 /* now store initial data */
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67 *out++ = 0x02;
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68 if (y < 128) {
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69 /* short form */
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70 *out++ = (unsigned char)y;
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71 } else if (y < 256) {
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72 *out++ = 0x81;
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73 *out++ = (unsigned char)y;
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74 } else if (y < 65536UL) {
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75 *out++ = 0x82;
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76 *out++ = (unsigned char)((y>>8)&255);
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77 *out++ = (unsigned char)y;
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78 } else if (y < 16777216UL) {
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79 *out++ = 0x83;
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80 *out++ = (unsigned char)((y>>16)&255);
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81 *out++ = (unsigned char)((y>>8)&255);
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82 *out++ = (unsigned char)y;
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83 } else {
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84 return CRYPT_INVALID_ARG;
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85 }
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86
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87 /* now store msbyte of zero if num is non-zero */
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88 if (leading_zero) {
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89 *out++ = 0x00;
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90 }
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91
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92 /* if it's not zero store it as big endian */
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93 if (mp_cmp_d(num, 0) == LTC_MP_GT) {
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94 /* now store the mpint */
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95 if ((err = mp_to_unsigned_bin(num, out)) != CRYPT_OK) {
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96 return err;
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97 }
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98 } else if (mp_iszero(num) != LTC_MP_YES) {
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99 void *tmp;
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100
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101 /* negative */
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102 if (mp_init(&tmp) != CRYPT_OK) {
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103 return CRYPT_MEM;
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104 }
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105
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106 /* 2^roundup and subtract */
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107 y = mp_count_bits(num);
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108 y = y + (8 - (y & 7));
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109 if (((mp_cnt_lsb(num)+1)==mp_count_bits(num)) && ((mp_count_bits(num)&7)==0)) y -= 8;
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110 if (mp_2expt(tmp, y) != CRYPT_OK || mp_add(tmp, num, tmp) != CRYPT_OK) {
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111 mp_clear(tmp);
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112 return CRYPT_MEM;
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113 }
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114 if ((err = mp_to_unsigned_bin(tmp, out)) != CRYPT_OK) {
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115 mp_clear(tmp);
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116 return err;
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117 }
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118 mp_clear(tmp);
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119 }
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120
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121 /* we good */
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122 *outlen = tmplen;
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123 return CRYPT_OK;
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124 }
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125
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126 #endif
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127
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128 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/integer/der_encode_integer.c,v $ */
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129 /* $Revision: 1.8 $ */
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130 /* $Date: 2006/12/04 21:34:03 $ */