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comparison libtomcrypt/src/mac/pelican/pelican.c @ 1478:3a933956437e coverity

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author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 23:49:22 +0800
parents 6dba84798cd5
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1439:8d24733026c5 1478:3a933956437e
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 pelican.c 12 @file pelican.c
15 Pelican MAC, initialize state, by Tom St Denis 13 Pelican MAC, initialize state, by Tom St Denis
16 */ 14 */
17 15
18 #ifdef LTC_PELICAN 16 #ifdef LTC_PELICAN
19 17
18 #define __LTC_AES_TAB_C__
20 #define ENCRYPT_ONLY 19 #define ENCRYPT_ONLY
21 #define PELI_TAB 20 #define PELI_TAB
22 #include "../../ciphers/aes/aes_tab.c" 21 #include "../../ciphers/aes/aes_tab.c"
23 22
24 /** 23 /**
25 Initialize a Pelican state 24 Initialize a Pelican state
26 @param pelmac The Pelican state to initialize 25 @param pelmac The Pelican state to initialize
27 @param key The secret key 26 @param key The secret key
28 @param keylen The length of the secret key (octets) 27 @param keylen The length of the secret key (octets)
29 @return CRYPT_OK if successful 28 @return CRYPT_OK if successful
30 */ 29 */
31 int pelican_init(pelican_state *pelmac, const unsigned char *key, unsigned long keylen) 30 int pelican_init(pelican_state *pelmac, const unsigned char *key, unsigned long keylen)
32 { 31 {
33 int err; 32 int err;
34 33
35 LTC_ARGCHK(pelmac != NULL); 34 LTC_ARGCHK(pelmac != NULL);
36 LTC_ARGCHK(key != NULL); 35 LTC_ARGCHK(key != NULL);
37 36
38 #ifdef LTC_FAST 37 #ifdef LTC_FAST
39 if (16 % sizeof(LTC_FAST_TYPE)) { 38 if (16 % sizeof(LTC_FAST_TYPE)) {
47 46
48 zeromem(pelmac->state, 16); 47 zeromem(pelmac->state, 16);
49 aes_ecb_encrypt(pelmac->state, pelmac->state, &pelmac->K); 48 aes_ecb_encrypt(pelmac->state, pelmac->state, &pelmac->K);
50 pelmac->buflen = 0; 49 pelmac->buflen = 0;
51 50
52 return CRYPT_OK; 51 return CRYPT_OK;
53 } 52 }
54 53
55 static void four_rounds(pelican_state *pelmac) 54 static void _four_rounds(pelican_state *pelmac)
56 { 55 {
57 ulong32 s0, s1, s2, s3, t0, t1, t2, t3; 56 ulong32 s0, s1, s2, s3, t0, t1, t2, t3;
58 int r; 57 int r;
59 58
60 LOAD32H(s0, pelmac->state ); 59 LOAD32H(s0, pelmac->state );
88 STORE32H(s1, pelmac->state + 4); 87 STORE32H(s1, pelmac->state + 4);
89 STORE32H(s2, pelmac->state + 8); 88 STORE32H(s2, pelmac->state + 8);
90 STORE32H(s3, pelmac->state + 12); 89 STORE32H(s3, pelmac->state + 12);
91 } 90 }
92 91
93 /** 92 /**
94 Process a block of text through Pelican 93 Process a block of text through Pelican
95 @param pelmac The Pelican MAC state 94 @param pelmac The Pelican MAC state
96 @param in The input 95 @param in The input
97 @param inlen The length input (octets) 96 @param inlen The length input (octets)
98 @return CRYPT_OK on success 97 @return CRYPT_OK on success
111 #ifdef LTC_FAST 110 #ifdef LTC_FAST
112 if (pelmac->buflen == 0) { 111 if (pelmac->buflen == 0) {
113 while (inlen & ~15) { 112 while (inlen & ~15) {
114 int x; 113 int x;
115 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) { 114 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) {
116 *((LTC_FAST_TYPE*)((unsigned char *)pelmac->state + x)) ^= *((LTC_FAST_TYPE*)((unsigned char *)in + x)); 115 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pelmac->state + x)) ^= *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)in + x));
117 } 116 }
118 four_rounds(pelmac); 117 _four_rounds(pelmac);
119 in += 16; 118 in += 16;
120 inlen -= 16; 119 inlen -= 16;
121 } 120 }
122 } 121 }
123 #endif 122 #endif
124 123
125 while (inlen--) { 124 while (inlen--) {
126 pelmac->state[pelmac->buflen++] ^= *in++; 125 pelmac->state[pelmac->buflen++] ^= *in++;
127 if (pelmac->buflen == 16) { 126 if (pelmac->buflen == 16) {
128 four_rounds(pelmac); 127 _four_rounds(pelmac);
129 pelmac->buflen = 0; 128 pelmac->buflen = 0;
130 } 129 }
131 } 130 }
132 return CRYPT_OK; 131 return CRYPT_OK;
133 } 132 }
147 if (pelmac->buflen < 0 || pelmac->buflen > 16) { 146 if (pelmac->buflen < 0 || pelmac->buflen > 16) {
148 return CRYPT_INVALID_ARG; 147 return CRYPT_INVALID_ARG;
149 } 148 }
150 149
151 if (pelmac->buflen == 16) { 150 if (pelmac->buflen == 16) {
152 four_rounds(pelmac); 151 _four_rounds(pelmac);
153 pelmac->buflen = 0; 152 pelmac->buflen = 0;
154 } 153 }
155 pelmac->state[pelmac->buflen++] ^= 0x80; 154 pelmac->state[pelmac->buflen++] ^= 0x80;
156 aes_ecb_encrypt(pelmac->state, out, &pelmac->K); 155 aes_ecb_encrypt(pelmac->state, out, &pelmac->K);
157 aes_done(&pelmac->K); 156 aes_done(&pelmac->K);
158 return CRYPT_OK; 157 return CRYPT_OK;
159 } 158 }
160 159
161 #endif 160 #endif
162 161
163 /* $Source$ */ 162 /* ref: $Format:%D$ */
164 /* $Revision$ */ 163 /* git commit: $Format:%H$ */
165 /* $Date$ */ 164 /* commit time: $Format:%ai$ */