1/*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#define idea_mul(r,a,b,ul) \
11ul=(unsigned long)a*b; \
12if (ul != 0) \
13 { \
14 r=(ul&0xffff)-(ul>>16); \
15 r-=((r)>>16); \
16 } \
17else \
18 r=(-(int)a-b+1); /* assuming a or b is 0 and in range */
19
20/* NOTE - c is not incremented as per n2l */
21#define n2ln(c,l1,l2,n) { \
22 c+=n; \
23 l1=l2=0; \
24 switch (n) { \
25 case 8: l2 =((unsigned long)(*(--(c)))) ; \
26 /* fall thru */ \
27 case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
28 /* fall thru */ \
29 case 6: l2|=((unsigned long)(*(--(c))))<<16; \
30 /* fall thru */ \
31 case 5: l2|=((unsigned long)(*(--(c))))<<24; \
32 /* fall thru */ \
33 case 4: l1 =((unsigned long)(*(--(c)))) ; \
34 /* fall thru */ \
35 case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
36 /* fall thru */ \
37 case 2: l1|=((unsigned long)(*(--(c))))<<16; \
38 /* fall thru */ \
39 case 1: l1|=((unsigned long)(*(--(c))))<<24; \
40 } \
41 }
42
43/* NOTE - c is not incremented as per l2n */
44#define l2nn(l1,l2,c,n) { \
45 c+=n; \
46 switch (n) { \
47 case 8: *(--(c))=(unsigned char)(((l2) )&0xff); \
48 /* fall thru */ \
49 case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
50 /* fall thru */ \
51 case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
52 /* fall thru */ \
53 case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
54 /* fall thru */ \
55 case 4: *(--(c))=(unsigned char)(((l1) )&0xff); \
56 /* fall thru */ \
57 case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
58 /* fall thru */ \
59 case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
60 /* fall thru */ \
61 case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
62 } \
63 }
64
65#undef n2l
66#define n2l(c,l) (l =((unsigned long)(*((c)++)))<<24L, \
67 l|=((unsigned long)(*((c)++)))<<16L, \
68 l|=((unsigned long)(*((c)++)))<< 8L, \
69 l|=((unsigned long)(*((c)++))))
70
71#undef l2n
72#define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
73 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
74 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
75 *((c)++)=(unsigned char)(((l) )&0xff))
76
77#undef s2n
78#define s2n(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
79 *((c)++)=(unsigned char)(((l)>> 8L)&0xff))
80
81#undef n2s
82#define n2s(c,l) (l =((IDEA_INT)(*((c)++)))<< 8L, \
83 l|=((IDEA_INT)(*((c)++))) )
84
85
86#define E_IDEA(num) \
87 x1&=0xffff; \
88 idea_mul(x1,x1,*p,ul); p++; \
89 x2+= *(p++); \
90 x3+= *(p++); \
91 x4&=0xffff; \
92 idea_mul(x4,x4,*p,ul); p++; \
93 t0=(x1^x3)&0xffff; \
94 idea_mul(t0,t0,*p,ul); p++; \
95 t1=(t0+(x2^x4))&0xffff; \
96 idea_mul(t1,t1,*p,ul); p++; \
97 t0+=t1; \
98 x1^=t1; \
99 x4^=t0; \
100 ul=x2^t0; /* do the swap to x3 */ \
101 x2=x3^t1; \
102 x3=ul;
103