1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
using System;
using System.Collections;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;
using Org.BouncyCastle.Math.EC.Multiplier;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Asn1.GM
{
public sealed class GMNamedCurves
{
private GMNamedCurves()
{
}
private static X9ECPoint ConfigureBasepoint(ECCurve curve, string encoding)
{
X9ECPoint G = new X9ECPoint(curve, Hex.DecodeStrict(encoding));
WNafUtilities.ConfigureBasepoint(G.Point);
return G;
}
private static ECCurve ConfigureCurve(ECCurve curve)
{
return curve;
}
private static BigInteger FromHex(string hex)
{
return new BigInteger(1, Hex.DecodeStrict(hex));
}
/*
* sm2p256v1
*/
internal class SM2P256V1Holder
: X9ECParametersHolder
{
private SM2P256V1Holder() {}
internal static readonly X9ECParametersHolder Instance = new SM2P256V1Holder();
protected override X9ECParameters CreateParameters()
{
BigInteger p = FromHex("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF");
BigInteger a = FromHex("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC");
BigInteger b = FromHex("28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93");
byte[] S = null;
BigInteger n = FromHex("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123");
BigInteger h = BigInteger.One;
ECCurve curve = ConfigureCurve(new FpCurve(p, a, b, n, h));
X9ECPoint G = ConfigureBasepoint(curve,
"0432C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0");
return new X9ECParameters(curve, G, n, h, S);
}
}
/*
* wapip192v1
*/
internal class WapiP192V1Holder
: X9ECParametersHolder
{
private WapiP192V1Holder() { }
internal static readonly X9ECParametersHolder Instance = new WapiP192V1Holder();
protected override X9ECParameters CreateParameters()
{
BigInteger p = FromHex("BDB6F4FE3E8B1D9E0DA8C0D46F4C318CEFE4AFE3B6B8551F");
BigInteger a = FromHex("BB8E5E8FBC115E139FE6A814FE48AAA6F0ADA1AA5DF91985");
BigInteger b = FromHex("1854BEBDC31B21B7AEFC80AB0ECD10D5B1B3308E6DBF11C1");
byte[] S = null;
BigInteger n = FromHex("BDB6F4FE3E8B1D9E0DA8C0D40FC962195DFAE76F56564677");
BigInteger h = BigInteger.One;
ECCurve curve = ConfigureCurve(new FpCurve(p, a, b, n, h));
X9ECPoint G = ConfigureBasepoint(curve,
"044AD5F7048DE709AD51236DE65E4D4B482C836DC6E410664002BB3A02D4AAADACAE24817A4CA3A1B014B5270432DB27D2");
return new X9ECParameters(curve, G, n, h, S);
}
}
private static readonly IDictionary objIds = Platform.CreateHashtable();
private static readonly IDictionary curves = Platform.CreateHashtable();
private static readonly IDictionary names = Platform.CreateHashtable();
private static void DefineCurve(
string name,
DerObjectIdentifier oid,
X9ECParametersHolder holder)
{
objIds.Add(Platform.ToUpperInvariant(name), oid);
names.Add(oid, name);
curves.Add(oid, holder);
}
static GMNamedCurves()
{
DefineCurve("wapip192v1", GMObjectIdentifiers.wapip192v1, WapiP192V1Holder.Instance);
DefineCurve("sm2p256v1", GMObjectIdentifiers.sm2p256v1, SM2P256V1Holder.Instance);
}
public static X9ECParameters GetByName(
string name)
{
DerObjectIdentifier oid = GetOid(name);
return oid == null ? null : GetByOid(oid);
}
/**
* return the X9ECParameters object for the named curve represented by
* the passed in object identifier. Null if the curve isn't present.
*
* @param oid an object identifier representing a named curve, if present.
*/
public static X9ECParameters GetByOid(
DerObjectIdentifier oid)
{
X9ECParametersHolder holder = (X9ECParametersHolder)curves[oid];
return holder == null ? null : holder.Parameters;
}
/**
* return the object identifier signified by the passed in name. Null
* if there is no object identifier associated with name.
*
* @return the object identifier associated with name, if present.
*/
public static DerObjectIdentifier GetOid(
string name)
{
return (DerObjectIdentifier)objIds[Platform.ToUpperInvariant(name)];
}
/**
* return the named curve name represented by the given object identifier.
*/
public static string GetName(
DerObjectIdentifier oid)
{
return (string)names[oid];
}
/**
* returns an enumeration containing the name strings for curves
* contained in this structure.
*/
public static IEnumerable Names
{
get { return new EnumerableProxy(names.Values); }
}
}
}
|
