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2 Copyright(c) 2011-2015 Intel Corporation All rights reserved.
3
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions
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8 notice, this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above copyright
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15 from this software without specific prior written permission.
16
17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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21 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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28 **********************************************************************/
29
30 #include <limits.h>
31 #include <stdint.h>
32
33 #if __WORDSIZE == 64 || _WIN64 || __x86_64__
34 #define notbit0 0xfefefefefefefefeULL
35 #define bit7 0x8080808080808080ULL
36 #define gf8poly 0x1d1d1d1d1d1d1d1dULL
37 #else
38 #define notbit0 0xfefefefeUL
39 #define bit7 0x80808080UL
40 #define gf8poly 0x1d1d1d1dUL
41 #endif
42
43 int
pq_gen_base(int vects,int len,void ** array)44 pq_gen_base(int vects, int len, void **array)
45 {
46 int i, j;
47 unsigned long p, q, s;
48 unsigned long **src = (unsigned long **) array;
49 int blocks = len / sizeof(long);
50
51 if (vects < 4)
52 return 1; // Must have at least 2 src and 2 dest
53
54 for (i = 0; i < blocks; i++) {
55 q = p = src[vects - 3][i];
56
57 for (j = vects - 4; j >= 0; j--) {
58 p ^= s = src[j][i];
59 q = s ^ (((q << 1) & notbit0) ^ // shift each byte
60 ((((q & bit7) << 1) - ((q & bit7) >> 7)) // mask out bytes
61 & gf8poly)); // apply poly
62 }
63
64 src[vects - 2][i] = p; // second to last pointer is p
65 src[vects - 1][i] = q; // last pointer is q
66 }
67 return 0;
68 }
69
70 int
pq_check_base(int vects,int len,void ** array)71 pq_check_base(int vects, int len, void **array)
72 {
73 int i, j;
74 unsigned char p, q, s;
75 unsigned char **src = (unsigned char **) array;
76
77 if (vects < 4)
78 return 1; // Must have at least 2 src and 2 dest
79
80 for (i = 0; i < len; i++) {
81 q = p = src[vects - 3][i];
82
83 for (j = vects - 4; j >= 0; j--) {
84 s = src[j][i];
85 p ^= s;
86
87 // mult by GF{2}
88 q = s ^ ((q << 1) ^ ((q & 0x80) ? 0x1d : 0));
89 }
90
91 if (src[vects - 2][i] != p) // second to last pointer is p
92 return i | 1;
93 if (src[vects - 1][i] != q) // last pointer is q
94 return i | 2;
95 }
96 return 0;
97 }
98
99 int
xor_gen_base(int vects,int len,void ** array)100 xor_gen_base(int vects, int len, void **array)
101 {
102 int i, j;
103 unsigned char parity;
104 unsigned char **src = (unsigned char **) array;
105
106 if (vects < 3)
107 return 1; // Must have at least 2 src and 1 dest
108
109 for (i = 0; i < len; i++) {
110 parity = src[0][i];
111 for (j = 1; j < vects - 1; j++)
112 parity ^= src[j][i];
113
114 src[vects - 1][i] = parity; // last pointer is dest
115 }
116
117 return 0;
118 }
119
120 int
xor_check_base(int vects,int len,void ** array)121 xor_check_base(int vects, int len, void **array)
122 {
123 int i, j, fail = 0;
124
125 unsigned char parity;
126 unsigned char **src = (unsigned char **) array;
127
128 if (vects < 2)
129 return 1; // Must have at least 2 src
130
131 for (i = 0; i < len; i++) {
132 parity = 0;
133 for (j = 0; j < vects; j++)
134 parity ^= src[j][i];
135
136 if (parity != 0) {
137 fail = 1;
138 break;
139 }
140 }
141 if (fail && len > 0)
142 return len;
143 return fail;
144 }
145