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comparison libtomcrypt/src/pk/katja/katja_decrypt_key.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
parents f849a5ca2efc
children
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1470:8bba51a55704 1471:6dba84798cd5
3 * LibTomCrypt is a library that provides various cryptographic 3 * LibTomCrypt is a library that provides various cryptographic
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 *
9 * Tom St Denis, [email protected], http://libtom.org
10 */ 8 */
11 #include "tomcrypt.h" 9 #include "tomcrypt.h"
12 10
13 /** 11 /**
14 @file katja_decrypt_key.c 12 @file katja_decrypt_key.c
15 Katja LTC_PKCS #1 OAEP Decryption, Tom St Denis 13 Katja PKCS #1 OAEP Decryption, Tom St Denis
16 */ 14 */
17 15
18 #ifdef MKAT 16 #ifdef LTC_MKAT
19 17
20 /** 18 /**
21 (LTC_PKCS #1 v2.0) decrypt then OAEP depad 19 (PKCS #1 v2.0) decrypt then OAEP depad
22 @param in The ciphertext 20 @param in The ciphertext
23 @param inlen The length of the ciphertext (octets) 21 @param inlen The length of the ciphertext (octets)
24 @param out [out] The plaintext 22 @param out [out] The plaintext
25 @param outlen [in/out] The max size and resulting size of the plaintext (octets) 23 @param outlen [in/out] The max size and resulting size of the plaintext (octets)
26 @param lparam The system "lparam" value 24 @param lparam The system "lparam" value
29 @param stat [out] Result of the decryption, 1==valid, 0==invalid 27 @param stat [out] Result of the decryption, 1==valid, 0==invalid
30 @param key The corresponding private Katja key 28 @param key The corresponding private Katja key
31 @return CRYPT_OK if succcessul (even if invalid) 29 @return CRYPT_OK if succcessul (even if invalid)
32 */ 30 */
33 int katja_decrypt_key(const unsigned char *in, unsigned long inlen, 31 int katja_decrypt_key(const unsigned char *in, unsigned long inlen,
34 unsigned char *out, unsigned long *outlen, 32 unsigned char *out, unsigned long *outlen,
35 const unsigned char *lparam, unsigned long lparamlen, 33 const unsigned char *lparam, unsigned long lparamlen,
36 int hash_idx, int *stat, 34 int hash_idx, int *stat,
37 katja_key *key) 35 katja_key *key)
38 { 36 {
39 unsigned long modulus_bitlen, modulus_bytelen, x; 37 unsigned long modulus_bitlen, modulus_bytelen, x;
40 int err; 38 int err;
41 unsigned char *tmp; 39 unsigned char *tmp;
42 40
43 LTC_ARGCHK(out != NULL); 41 LTC_ARGCHK(out != NULL);
44 LTC_ARGCHK(outlen != NULL); 42 LTC_ARGCHK(outlen != NULL);
45 LTC_ARGCHK(key != NULL); 43 LTC_ARGCHK(key != NULL);
46 LTC_ARGCHK(stat != NULL); 44 LTC_ARGCHK(stat != NULL);
47 45
50 48
51 /* valid hash ? */ 49 /* valid hash ? */
52 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { 50 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
53 return err; 51 return err;
54 } 52 }
55 53
56 /* get modulus len in bits */ 54 /* get modulus len in bits */
57 modulus_bitlen = mp_count_bits( (key->N)); 55 modulus_bitlen = mp_count_bits( (key->N));
58 56
59 /* payload is upto pq, so we know q is 1/3rd the size of N and therefore pq is 2/3th the size */ 57 /* payload is upto pq, so we know q is 1/3rd the size of N and therefore pq is 2/3th the size */
60 modulus_bitlen = ((modulus_bitlen << 1) / 3); 58 modulus_bitlen = ((modulus_bitlen << 1) / 3);
98 96
99 97
100 98
101 99
102 100
103 /* $Source$ */ 101 /* ref: $Format:%D$ */
104 /* $Revision$ */ 102 /* git commit: $Format:%H$ */
105 /* $Date$ */ 103 /* commit time: $Format:%ai$ */