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comparison libtomcrypt/src/pk/asn1/der/integer/der_decode_integer.c @ 398:59c7938af2bd

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merge of '1250b8af44b62d8f4fe0f8d9fc7e7a1cc34e7e1c' and '7f8670ac3bb975f40967f3979d09d2199b7e90c8'
author Matt Johnston <matt@ucc.asn.au>
date Sat, 03 Feb 2007 08:20:30 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
comparison
equal deleted inserted replaced
396:e7c1a77d2921 398:59c7938af2bd
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 * 8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org 9 * Tom St Denis, [email protected], http://libtomcrypt.com
10 */ 10 */
11 #include "tomcrypt.h" 11 #include "tomcrypt.h"
12 12
13 /** 13 /**
14 @file der_decode_integer.c 14 @file der_decode_integer.c
23 @param in The DER encoded data 23 @param in The DER encoded data
24 @param inlen Size of DER encoded data 24 @param inlen Size of DER encoded data
25 @param num The first mp_int to decode 25 @param num The first mp_int to decode
26 @return CRYPT_OK if successful 26 @return CRYPT_OK if successful
27 */ 27 */
28 int der_decode_integer(const unsigned char *in, unsigned long inlen, mp_int *num) 28 int der_decode_integer(const unsigned char *in, unsigned long inlen, void *num)
29 { 29 {
30 unsigned long x, y, z; 30 unsigned long x, y, z;
31 int err; 31 int err;
32 32
33 LTC_ARGCHK(num != NULL); 33 LTC_ARGCHK(num != NULL);
54 if (x + z > inlen) { 54 if (x + z > inlen) {
55 return CRYPT_INVALID_PACKET; 55 return CRYPT_INVALID_PACKET;
56 } 56 }
57 57
58 /* no so read it */ 58 /* no so read it */
59 if ((err = mpi_to_ltc_error(mp_read_unsigned_bin(num, (unsigned char *)in + x, z))) != CRYPT_OK) { 59 if ((err = mp_read_unsigned_bin(num, (unsigned char *)in + x, z)) != CRYPT_OK) {
60 return err; 60 return err;
61 } 61 }
62 } else { 62 } else {
63 /* long form */ 63 /* long form */
64 z &= 0x7F; 64 z &= 0x7F;
78 if ((x + y) > inlen) { 78 if ((x + y) > inlen) {
79 return CRYPT_INVALID_PACKET; 79 return CRYPT_INVALID_PACKET;
80 } 80 }
81 81
82 /* no so read it */ 82 /* no so read it */
83 if ((err = mpi_to_ltc_error(mp_read_unsigned_bin(num, (unsigned char *)in + x, y))) != CRYPT_OK) { 83 if ((err = mp_read_unsigned_bin(num, (unsigned char *)in + x, y)) != CRYPT_OK) {
84 return err; 84 return err;
85 } 85 }
86 } 86 }
87 87
88 /* see if it's negative */ 88 /* see if it's negative */
89 if (in[x] & 0x80) { 89 if (in[x] & 0x80) {
90 mp_int tmp; 90 void *tmp;
91 if (mp_init(&tmp) != MP_OKAY) { 91 if (mp_init(&tmp) != CRYPT_OK) {
92 return CRYPT_MEM; 92 return CRYPT_MEM;
93 } 93 }
94 94
95 if (mp_2expt(&tmp, mp_count_bits(num)) != MP_OKAY || mp_sub(num, &tmp, num) != MP_OKAY) { 95 if (mp_2expt(tmp, mp_count_bits(num)) != CRYPT_OK || mp_sub(num, tmp, num) != CRYPT_OK) {
96 mp_clear(&tmp); 96 mp_clear(tmp);
97 return CRYPT_MEM; 97 return CRYPT_MEM;
98 } 98 }
99 mp_clear(&tmp); 99 mp_clear(tmp);
100 } 100 }
101 101
102 return CRYPT_OK; 102 return CRYPT_OK;
103 103
104 } 104 }
105 105
106 #endif 106 #endif
107 107
108 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/integer/der_decode_integer.c,v $ */ 108 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/integer/der_decode_integer.c,v $ */
109 /* $Revision: 1.2 $ */ 109 /* $Revision: 1.4 $ */
110 /* $Date: 2005/06/01 00:06:05 $ */ 110 /* $Date: 2006/03/31 14:15:35 $ */