1 /* NN.H - header file for NN.C
4 /* Copyright (C) RSA Laboratories, a division of RSA Data Security,
5 Inc., created 1991. All rights reserved.
10 typedef UINT4 NN_DIGIT;
11 typedef UINT2 NN_HALF_DIGIT;
15 Note: MAX_NN_DIGITS is long enough to hold any RSA modulus, plus
16 one more digit as required by R_GeneratePEMKeys (for n and phiN,
17 whose lengths must be even). All natural numbers have at most
18 MAX_NN_DIGITS digits, except for double-length intermediate values
19 in NN_Mult (t), NN_ModMult (t), NN_ModInv (w), and NN_Div (c).
21 /* Length of digit in bits */
22 #define NN_DIGIT_BITS 32
23 #define NN_HALF_DIGIT_BITS 16
24 /* Length of digit in bytes */
25 #define NN_DIGIT_LEN (NN_DIGIT_BITS / 8)
26 /* Maximum length in digits */
27 #define MAX_NN_DIGITS \
28 ((MAX_RSA_MODULUS_LEN + NN_DIGIT_LEN - 1) / NN_DIGIT_LEN + 1)
30 #define MAX_NN_DIGIT 0xffffffff
31 #define MAX_NN_HALF_DIGIT 0xffff
35 #define LOW_HALF(x) ((x) & MAX_NN_HALF_DIGIT)
36 #define HIGH_HALF(x) (((x) >> NN_HALF_DIGIT_BITS) & MAX_NN_HALF_DIGIT)
37 #define TO_HIGH_HALF(x) (((NN_DIGIT)(x)) << NN_HALF_DIGIT_BITS)
38 #define DIGIT_MSB(x) (unsigned int)(((x) >> (NN_DIGIT_BITS - 1)) & 1)
39 #define DIGIT_2MSB(x) (unsigned int)(((x) >> (NN_DIGIT_BITS - 2)) & 3)
42 NN_Decode (a, digits, b, len) Decodes character string b into a.
43 NN_Encode (a, len, b, digits) Encodes a into character string b.
46 NN_Assign (a, b, digits) Assigns a = b.
47 NN_ASSIGN_DIGIT (a, b, digits) Assigns a = b, where b is a digit.
48 NN_AssignZero (a, b, digits) Assigns a = 0.
49 NN_Assign2Exp (a, b, digits) Assigns a = 2^b.
52 NN_Add (a, b, c, digits) Computes a = b + c.
53 NN_Sub (a, b, c, digits) Computes a = b - c.
54 NN_Mult (a, b, c, digits) Computes a = b * c.
55 NN_LShift (a, b, c, digits) Computes a = b * 2^c.
56 NN_RShift (a, b, c, digits) Computes a = b / 2^c.
57 NN_Div (a, b, c, cDigits, d, dDigits) Computes a = c div d and b = c mod d.
60 NN_Mod (a, b, bDigits, c, cDigits) Computes a = b mod c.
61 NN_ModMult (a, b, c, d, digits) Computes a = b * c mod d.
62 NN_ModExp (a, b, c, cDigits, d, dDigits) Computes a = b^c mod d.
63 NN_ModInv (a, b, c, digits) Computes a = 1/b mod c.
64 NN_Gcd (a, b, c, digits) Computes a = gcd (b, c).
67 NN_EVEN (a, digits) Returns 1 iff a is even.
68 NN_Cmp (a, b, digits) Returns sign of a - b.
69 NN_EQUAL (a, digits) Returns 1 iff a = b.
70 NN_Zero (a, digits) Returns 1 iff a = 0.
71 NN_Digits (a, digits) Returns significant length of a in digits.
72 NN_Bits (a, digits) Returns significant length of a in bits.
74 void NN_Decode PROTO_LIST
75 ((NN_DIGIT *, unsigned int, unsigned char *, unsigned int));
76 void NN_Encode PROTO_LIST
77 ((unsigned char *, unsigned int, NN_DIGIT *, unsigned int));
79 void NN_Assign PROTO_LIST ((NN_DIGIT *, NN_DIGIT *, unsigned int));
80 void NN_AssignZero PROTO_LIST ((NN_DIGIT *, unsigned int));
81 void NN_Assign2Exp PROTO_LIST ((NN_DIGIT *, unsigned int, unsigned int));
83 NN_DIGIT NN_Add PROTO_LIST
84 ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
85 NN_DIGIT NN_Sub PROTO_LIST
86 ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
87 void NN_Mult PROTO_LIST ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
88 void NN_Div PROTO_LIST
89 ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int, NN_DIGIT *,
91 NN_DIGIT NN_LShift PROTO_LIST
92 ((NN_DIGIT *, NN_DIGIT *, unsigned int, unsigned int));
93 NN_DIGIT NN_RShift PROTO_LIST
94 ((NN_DIGIT *, NN_DIGIT *, unsigned int, unsigned int));
96 void NN_Mod PROTO_LIST
97 ((NN_DIGIT *, NN_DIGIT *, unsigned int, NN_DIGIT *, unsigned int));
98 void NN_ModMult PROTO_LIST
99 ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
100 void NN_ModExp PROTO_LIST
101 ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int, NN_DIGIT *,
103 void NN_ModInv PROTO_LIST
104 ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
105 void NN_Gcd PROTO_LIST ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
107 int NN_Cmp PROTO_LIST ((NN_DIGIT *, NN_DIGIT *, unsigned int));
108 int NN_Zero PROTO_LIST ((NN_DIGIT *, unsigned int));
109 unsigned int NN_Bits PROTO_LIST ((NN_DIGIT *, unsigned int));
110 unsigned int NN_Digits PROTO_LIST ((NN_DIGIT *, unsigned int));
112 #define NN_ASSIGN_DIGIT(a, b, digits) {NN_AssignZero (a, digits); a[0] = b;}
113 #define NN_EQUAL(a, b, digits) (! NN_Cmp (a, b, digits))
114 #define NN_EVEN(a, digits) (((digits) == 0) || ! (a[0] & 1))