Mercurial > dropbear

comparison libtomcrypt/src/modes/cbc/cbc_encrypt.c @ 1471:6dba84798cd5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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
comparison
equal deleted inserted replaced
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 cbc_encrypt.c 12 @file cbc_encrypt.c
35 LTC_ARGCHK(cbc != NULL); 33 LTC_ARGCHK(cbc != NULL);
36 34
37 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) { 35 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
38 return err; 36 return err;
39 } 37 }
40 38
41 /* is blocklen valid? */ 39 /* is blocklen valid? */
42 if (cbc->blocklen < 1 || cbc->blocklen > (int)sizeof(cbc->IV)) { 40 if (cbc->blocklen < 1 || cbc->blocklen > (int)sizeof(cbc->IV)) {
43 return CRYPT_INVALID_ARG; 41 return CRYPT_INVALID_ARG;
44 } 42 }
45 43
46 if (len % cbc->blocklen) { 44 if (len % cbc->blocklen) {
47 return CRYPT_INVALID_ARG; 45 return CRYPT_INVALID_ARG;
48 } 46 }
49 #ifdef LTC_FAST 47 #ifdef LTC_FAST
50 if (cbc->blocklen % sizeof(LTC_FAST_TYPE)) { 48 if (cbc->blocklen % sizeof(LTC_FAST_TYPE)) {
51 return CRYPT_INVALID_ARG; 49 return CRYPT_INVALID_ARG;
52 } 50 }
53 #endif 51 #endif
54 52
55 if (cipher_descriptor[cbc->cipher].accel_cbc_encrypt != NULL) { 53 if (cipher_descriptor[cbc->cipher].accel_cbc_encrypt != NULL) {
56 return cipher_descriptor[cbc->cipher].accel_cbc_encrypt(pt, ct, len / cbc->blocklen, cbc->IV, &cbc->key); 54 return cipher_descriptor[cbc->cipher].accel_cbc_encrypt(pt, ct, len / cbc->blocklen, cbc->IV, &cbc->key);
57 } else { 55 } else {
58 while (len) { 56 while (len) {
59 /* xor IV against plaintext */ 57 /* xor IV against plaintext */
60 #if defined(LTC_FAST) 58 #if defined(LTC_FAST)
61 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { 59 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
62 *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) ^= *((LTC_FAST_TYPE*)((unsigned char *)pt + x)); 60 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)cbc->IV + x)) ^= *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pt + x));
63 } 61 }
64 #else 62 #else
65 for (x = 0; x < cbc->blocklen; x++) { 63 for (x = 0; x < cbc->blocklen; x++) {
66 cbc->IV[x] ^= pt[x]; 64 cbc->IV[x] ^= pt[x];
67 } 65 }
68 #endif 66 #endif
69 67
70 /* encrypt */ 68 /* encrypt */
71 if ((err = cipher_descriptor[cbc->cipher].ecb_encrypt(cbc->IV, ct, &cbc->key)) != CRYPT_OK) { 69 if ((err = cipher_descriptor[cbc->cipher].ecb_encrypt(cbc->IV, ct, &cbc->key)) != CRYPT_OK) {
72 return err; 70 return err;
73 } 71 }
74 72
75 /* store IV [ciphertext] for a future block */ 73 /* store IV [ciphertext] for a future block */
76 #if defined(LTC_FAST) 74 #if defined(LTC_FAST)
77 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { 75 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
78 *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) = *((LTC_FAST_TYPE*)((unsigned char *)ct + x)); 76 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)cbc->IV + x)) = *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ct + x));
79 } 77 }
80 #else 78 #else
81 for (x = 0; x < cbc->blocklen; x++) { 79 for (x = 0; x < cbc->blocklen; x++) {
82 cbc->IV[x] = ct[x]; 80 cbc->IV[x] = ct[x];
83 } 81 }
84 #endif 82 #endif
85 83
86 ct += cbc->blocklen; 84 ct += cbc->blocklen;
87 pt += cbc->blocklen; 85 pt += cbc->blocklen;
88 len -= cbc->blocklen; 86 len -= cbc->blocklen;
89 } 87 }
90 } 88 }
91 return CRYPT_OK; 89 return CRYPT_OK;
92 } 90 }
93 91
94 #endif 92 #endif
95 93
96 /* $Source$ */ 94 /* ref: $Format:%D$ */
97 /* $Revision$ */ 95 /* git commit: $Format:%H$ */
98 /* $Date$ */ 96 /* commit time: $Format:%ai$ */