Mercurial > dropbear

annotate src/pk/asn1/der/integer/der_encode_integer.c @ 281:997e6f7dc01e libtomcrypt-dropbear

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Just import the Dropbear 0.47 libtomcrypt changes
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:02:58 +0000
parents 59400faa4b44
children d5faf4814ddb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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.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_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(mp_int *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 return CRYPT_BUFFER_OVERFLOW;
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45 }
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46
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47 if (mp_cmp_d(num, 0) != MP_LT) {
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48 /* we only need a leading zero if the msb of the first byte is one */
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49 if ((mp_count_bits(num) & 7) == 0 || mp_iszero(num) == MP_YES) {
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50 leading_zero = 1;
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51 } else {
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52 leading_zero = 0;
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53 }
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54
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55 /* get length of num in bytes (plus 1 since we force the msbyte to zero) */
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56 y = mp_unsigned_bin_size(num) + leading_zero;
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57 } else {
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58 leading_zero = 0;
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59 y = mp_count_bits(num);
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60 y = y + (8 - (y & 7));
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61 y = y >> 3;
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62
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63 }
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64
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65 /* now store initial data */
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66 *out++ = 0x02;
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67 if (y < 128) {
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68 /* short form */
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69 *out++ = (unsigned char)y;
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70 } else if (y < 256) {
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71 *out++ = 0x81;
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72 *out++ = y;
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73 } else if (y < 65536UL) {
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74 *out++ = 0x82;
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75 *out++ = (y>>8)&255;
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76 *out++ = y;
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77 } else if (y < 16777216UL) {
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78 *out++ = 0x83;
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79 *out++ = (y>>16)&255;
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80 *out++ = (y>>8)&255;
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81 *out++ = y;
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82 } else {
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83 return CRYPT_INVALID_ARG;
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84 }
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85
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86 /* now store msbyte of zero if num is non-zero */
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87 if (leading_zero) {
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88 *out++ = 0x00;
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89 }
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90
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91 /* if it's not zero store it as big endian */
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92 if (mp_cmp_d(num, 0) == MP_GT) {
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93 /* now store the mpint */
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94 if ((err = mp_to_unsigned_bin(num, out)) != MP_OKAY) {
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95 return mpi_to_ltc_error(err);
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96 }
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97 } else if (mp_iszero(num) != MP_YES) {
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98 mp_int tmp;
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99 /* negative */
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100 if (mp_init(&tmp) != MP_OKAY) {
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101 return CRYPT_MEM;
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102 }
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103
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104 /* 2^roundup and subtract */
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105 y = mp_count_bits(num);
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106 y = y + (8 - (y & 7));
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107 if (mp_2expt(&tmp, y) != MP_OKAY || mp_add(&tmp, num, &tmp) != MP_OKAY) {
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108 mp_clear(&tmp);
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109 return CRYPT_MEM;
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110 }
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111
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112 if ((err = mp_to_unsigned_bin(&tmp, out)) != MP_OKAY) {
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113 mp_clear(&tmp);
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114 return mpi_to_ltc_error(err);
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115 }
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116 mp_clear(&tmp);
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117 }
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118
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119 /* we good */
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120 *outlen = tmplen;
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121 return CRYPT_OK;
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122 }
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123
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124 #endif
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125
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126 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/integer/der_encode_integer.c,v $ */
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127 /* $Revision: 1.1 $ */
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128 /* $Date: 2005/05/16 15:08:11 $ */