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comparison libtomcrypt/src/modes/f8/f8_encrypt.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 f8_encrypt.c 12 @file f8_encrypt.c
33 LTC_ARGCHK(ct != NULL); 31 LTC_ARGCHK(ct != NULL);
34 LTC_ARGCHK(f8 != NULL); 32 LTC_ARGCHK(f8 != NULL);
35 if ((err = cipher_is_valid(f8->cipher)) != CRYPT_OK) { 33 if ((err = cipher_is_valid(f8->cipher)) != CRYPT_OK) {
36 return err; 34 return err;
37 } 35 }
38 36
39 /* is blocklen/padlen valid? */ 37 /* is blocklen/padlen valid? */
40 if (f8->blocklen < 0 || f8->blocklen > (int)sizeof(f8->IV) || 38 if (f8->blocklen < 0 || f8->blocklen > (int)sizeof(f8->IV) ||
41 f8->padlen < 0 || f8->padlen > (int)sizeof(f8->IV)) { 39 f8->padlen < 0 || f8->padlen > (int)sizeof(f8->IV)) {
42 return CRYPT_INVALID_ARG; 40 return CRYPT_INVALID_ARG;
43 } 41 }
44 42
45 zeromem(buf, sizeof(buf)); 43 zeromem(buf, sizeof(buf));
46 44
47 /* make sure the pad is empty */ 45 /* make sure the pad is empty */
48 if (f8->padlen == f8->blocklen) { 46 if (f8->padlen == f8->blocklen) {
49 /* xor of IV, MIV and blockcnt == what goes into cipher */ 47 /* xor of IV, MIV and blockcnt == what goes into cipher */
62 if (f8->padlen == 0) { 60 if (f8->padlen == 0) {
63 while (len >= (unsigned long)f8->blocklen) { 61 while (len >= (unsigned long)f8->blocklen) {
64 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4))); 62 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4)));
65 ++(f8->blockcnt); 63 ++(f8->blockcnt);
66 for (x = 0; x < f8->blocklen; x += sizeof(LTC_FAST_TYPE)) { 64 for (x = 0; x < f8->blocklen; x += sizeof(LTC_FAST_TYPE)) {
67 *((LTC_FAST_TYPE*)(&ct[x])) = *((LTC_FAST_TYPE*)(&pt[x])) ^ *((LTC_FAST_TYPE*)(&f8->IV[x])); 65 *(LTC_FAST_TYPE_PTR_CAST(&ct[x])) = *(LTC_FAST_TYPE_PTR_CAST(&pt[x])) ^ *(LTC_FAST_TYPE_PTR_CAST(&f8->IV[x]));
68 *((LTC_FAST_TYPE*)(&f8->IV[x])) ^= *((LTC_FAST_TYPE*)(&f8->MIV[x])) ^ *((LTC_FAST_TYPE*)(&buf[x])); 66 *(LTC_FAST_TYPE_PTR_CAST(&f8->IV[x])) ^= *(LTC_FAST_TYPE_PTR_CAST(&f8->MIV[x])) ^ *(LTC_FAST_TYPE_PTR_CAST(&buf[x]));
69 } 67 }
70 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(f8->IV, f8->IV, &f8->key)) != CRYPT_OK) { 68 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(f8->IV, f8->IV, &f8->key)) != CRYPT_OK) {
71 return err; 69 return err;
72 } 70 }
73 len -= x; 71 len -= x;
74 pt += x; 72 pt += x;
75 ct += x; 73 ct += x;
76 } 74 }
77 } 75 }
78 #endif 76 #endif
79 77
80 while (len > 0) { 78 while (len > 0) {
81 if (f8->padlen == f8->blocklen) { 79 if (f8->padlen == f8->blocklen) {
82 /* xor of IV, MIV and blockcnt == what goes into cipher */ 80 /* xor of IV, MIV and blockcnt == what goes into cipher */
83 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4))); 81 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4)));
96 return CRYPT_OK; 94 return CRYPT_OK;
97 } 95 }
98 96
99 #endif 97 #endif
100 98
101 /* $Source$ */ 99 /* ref: $Format:%D$ */
102 /* $Revision$ */ 100 /* git commit: $Format:%H$ */
103 /* $Date$ */ 101 /* commit time: $Format:%ai$ */