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1.1 root 1: /* NN.H - header file for NN.C
2: */
3:
4: /* Copyright (C) 1991-2 RSA Laboratories, a division of RSA Data
5: Security, Inc. All rights reserved.
6: */
7:
8: /* Type definitions.
9: */
10: typedef UINT4 NN_DIGIT;
11: typedef UINT2 NN_HALF_DIGIT;
12:
13: /* Constants.
14:
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).
20: */
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)
29: /* Maximum digits */
30: #define MAX_NN_DIGIT 0xffffffff
31: #define MAX_NN_HALF_DIGIT 0xffff
32:
33: /* Macros.
34: */
35: #define LOW_HALF(x) (NN_HALF_DIGIT)((x) & MAX_NN_HALF_DIGIT)
36: #define HIGH_HALF(x) \
37: (NN_HALF_DIGIT)(((x) >> NN_HALF_DIGIT_BITS) & MAX_NN_HALF_DIGIT)
38: #define TO_HIGH_HALF(x) (((NN_DIGIT)(x)) << NN_HALF_DIGIT_BITS)
39: #define DIGIT_MSB(x) (unsigned int)(((x) >> (NN_DIGIT_BITS - 1)) & 1)
40: #define DIGIT_2MSB(x) (unsigned int)(((x) >> (NN_DIGIT_BITS - 2)) & 3)
41:
42: /* CONVERSIONS
43: NN_Decode (a, digits, b, len) Decodes character string b into a.
44: NN_Encode (a, len, b, digits) Encodes a into character string b.
45:
46: ASSIGNMENTS
47: NN_Assign (a, b, digits) Assigns a = b.
48: NN_ASSIGN_DIGIT (a, b, digits) Assigns a = b, where b is a digit.
49: NN_AssignZero (a, b, digits) Assigns a = 0.
50: NN_Assign2Exp (a, b, digits) Assigns a = 2^b.
51:
52: ARITHMETIC OPERATIONS
53: NN_Add (a, b, c, digits) Computes a = b + c.
54: NN_Sub (a, b, c, digits) Computes a = b - c.
55: NN_Mult (a, b, c, digits) Computes a = b * c.
56: NN_Mod (a, b, bDigits, c, cDigits) Computes a = b mod c.
57: NN_ModMult (a, b, c, d, digits) Computes a = b * c mod d.
58: NN_ModExp (a, b, c, cDigits, d, dDigits) Computes a = b^c mod .
59: NN_ModInv (a, b, c, digits) Computes a = 1/b mod c.
60: NN_Gcd (a, b, c, digits) Computes a = gcd (b, c).
61:
62: OTHER OPERATIONS
63: NN_EVEN (a, digits) Returns 1 iff a is even.
64: NN_Cmp (a, b, digits) Returns sign of a - b.
65: NN_EQUAL (a, digits) Returns 1 iff a = b.
66: NN_Zero (a, digits) Returns 1 iff a = 0.
67: NN_Digits (a, digits) Returns significant length of a in digits.
68: NN_Bits (a, digits) Returns significant length of a in bits.
69: */
70: void NN_Decode PROTO_LIST
71: ((NN_DIGIT *, unsigned int, unsigned char *, unsigned int));
72: void NN_Encode PROTO_LIST
73: ((unsigned char *, unsigned int, NN_DIGIT *, unsigned int));
74:
75: void NN_Assign PROTO_LIST ((NN_DIGIT *, NN_DIGIT *, unsigned int));
76: void NN_AssignZero PROTO_LIST ((NN_DIGIT *, unsigned int));
77: void NN_Assign2Exp PROTO_LIST ((NN_DIGIT *, unsigned int, unsigned int));
78:
79: NN_DIGIT NN_Add PROTO_LIST
80: ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
81: NN_DIGIT NN_Sub PROTO_LIST
82: ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
83: void NN_Mult PROTO_LIST ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
84: void NN_Mod PROTO_LIST
85: ((NN_DIGIT *, NN_DIGIT *, unsigned int, NN_DIGIT *, unsigned int));
86: void NN_ModMult PROTO_LIST
87: ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
88: void NN_ModExp PROTO_LIST
89: ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int, NN_DIGIT *,
90: unsigned int));
91: void NN_ModInv PROTO_LIST
92: ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
93: void NN_Gcd PROTO_LIST ((NN_DIGIT *, NN_DIGIT *, NN_DIGIT *, unsigned int));
94:
95: int NN_Cmp PROTO_LIST ((NN_DIGIT *, NN_DIGIT *, unsigned int));
96: int NN_Zero PROTO_LIST ((NN_DIGIT *, unsigned int));
97: unsigned int NN_Bits PROTO_LIST ((NN_DIGIT *, unsigned int));
98: unsigned int NN_Digits PROTO_LIST ((NN_DIGIT *, unsigned int));
99:
100: #define NN_ASSIGN_DIGIT(a, b, digits) {NN_AssignZero (a, digits); a[0] = b;}
101: #define NN_EQUAL(a, b, digits) (! NN_Cmp (a, b, digits))
102: #define NN_EVEN(a, digits) (((digits) == 0) || ! (a[0] & 1))
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