1 /* 2 * Copyright 1995-2024 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) \ 11 ul=(unsigned long)a*b; \ 12 if (ul != 0) { \ 13 r=(ul&0xffff)-(ul>>16); \ 14 r-=((r)>>16); \ 15 } else { \ 16 r=(-(int)a-b+1); /* assuming a or b is 0 and in range */ \ 17 } 18 19 /* NOTE - c is not incremented as per n2l */ 20 #define n2ln(c,l1,l2,n) { \ 21 c+=n; \ 22 l1=l2=0; \ 23 switch (n) { \ 24 case 8: l2 =((unsigned long)(*(--(c)))) ; \ 25 /* fall through */ \ 26 case 7: l2|=((unsigned long)(*(--(c))))<< 8; \ 27 /* fall through */ \ 28 case 6: l2|=((unsigned long)(*(--(c))))<<16; \ 29 /* fall through */ \ 30 case 5: l2|=((unsigned long)(*(--(c))))<<24; \ 31 /* fall through */ \ 32 case 4: l1 =((unsigned long)(*(--(c)))) ; \ 33 /* fall through */ \ 34 case 3: l1|=((unsigned long)(*(--(c))))<< 8; \ 35 /* fall through */ \ 36 case 2: l1|=((unsigned long)(*(--(c))))<<16; \ 37 /* fall through */ \ 38 case 1: l1|=((unsigned long)(*(--(c))))<<24; \ 39 } \ 40 } 41 42 /* NOTE - c is not incremented as per l2n */ 43 #define l2nn(l1,l2,c,n) { \ 44 c+=n; \ 45 switch (n) { \ 46 case 8: *(--(c))=(unsigned char)(((l2) )&0xff); \ 47 /* fall through */ \ 48 case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \ 49 /* fall through */ \ 50 case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \ 51 /* fall through */ \ 52 case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \ 53 /* fall through */ \ 54 case 4: *(--(c))=(unsigned char)(((l1) )&0xff); \ 55 /* fall through */ \ 56 case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \ 57 /* fall through */ \ 58 case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \ 59 /* fall through */ \ 60 case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \ 61 } \ 62 } 63 64 #undef n2l 65 #define n2l(c,l) (l =((unsigned long)(*((c)++)))<<24L, \ 66 l|=((unsigned long)(*((c)++)))<<16L, \ 67 l|=((unsigned long)(*((c)++)))<< 8L, \ 68 l|=((unsigned long)(*((c)++)))) 69 70 #undef l2n 71 #define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \ 72 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \ 73 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \ 74 *((c)++)=(unsigned char)(((l) )&0xff)) 75 76 #undef s2n 77 #define s2n(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \ 78 *((c)++)=(unsigned char)(((l)>> 8L)&0xff)) 79 80 #undef n2s 81 #define n2s(c,l) (l =((IDEA_INT)(*((c)++)))<< 8L, \ 82 l|=((IDEA_INT)(*((c)++))) ) 83 84 85 #define E_IDEA(num) \ 86 x1&=0xffff; \ 87 idea_mul(x1,x1,*p,ul); p++; \ 88 x2+= *(p++); \ 89 x3+= *(p++); \ 90 x4&=0xffff; \ 91 idea_mul(x4,x4,*p,ul); p++; \ 92 t0=(x1^x3)&0xffff; \ 93 idea_mul(t0,t0,*p,ul); p++; \ 94 t1=(t0+(x2^x4))&0xffff; \ 95 idea_mul(t1,t1,*p,ul); p++; \ 96 t0+=t1; \ 97 x1^=t1; \ 98 x4^=t0; \ 99 ul=x2^t0; /* do the swap to x3 */ \ 100 x2=x3^t1; \ 101 x3=ul; 102
