JCERSAPublicKey.java revision e1142c149e244797ce73b0e7fad40816e447a817 
1package org.bouncycastle.jce.provider;
2
3import java.io.IOException;
4import java.math.BigInteger;
5import java.security.interfaces.RSAPublicKey;
6import java.security.spec.RSAPublicKeySpec;
7
8import org.bouncycastle.asn1.ASN1Sequence;
9import org.bouncycastle.asn1.DERNull;
10import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
11import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
12import org.bouncycastle.asn1.x509.RSAPublicKeyStructure;
13import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
14import org.bouncycastle.crypto.params.RSAKeyParameters;
15import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
16
17public class JCERSAPublicKey
18    implements RSAPublicKey
19{
20    static final long serialVersionUID = 2675817738516720772L;
21
22    private BigInteger modulus;
23    private BigInteger publicExponent;
24
25    JCERSAPublicKey(
26        RSAKeyParameters key)
27    {
28        this.modulus = key.getModulus();
29        this.publicExponent = key.getExponent();
30    }
31
32    JCERSAPublicKey(
33        RSAPublicKeySpec spec)
34    {
35        this.modulus = spec.getModulus();
36        this.publicExponent = spec.getPublicExponent();
37    }
38
39    JCERSAPublicKey(
40        RSAPublicKey key)
41    {
42        this.modulus = key.getModulus();
43        this.publicExponent = key.getPublicExponent();
44    }
45
46    JCERSAPublicKey(
47        SubjectPublicKeyInfo    info)
48    {
49        try
50        {
51            RSAPublicKeyStructure   pubKey = new RSAPublicKeyStructure((ASN1Sequence)info.parsePublicKey());
52
53            this.modulus = pubKey.getModulus();
54            this.publicExponent = pubKey.getPublicExponent();
55        }
56        catch (IOException e)
57        {
58            throw new IllegalArgumentException("invalid info structure in RSA public key");
59        }
60    }
61
62    /**
63     * return the modulus.
64     *
65     * @return the modulus.
66     */
67    public BigInteger getModulus()
68    {
69        return modulus;
70    }
71
72    /**
73     * return the public exponent.
74     *
75     * @return the public exponent.
76     */
77    public BigInteger getPublicExponent()
78    {
79        return publicExponent;
80    }
81
82    public String getAlgorithm()
83    {
84        return "RSA";
85    }
86
87    public String getFormat()
88    {
89        return "X.509";
90    }
91
92    public byte[] getEncoded()
93    {
94        return KeyUtil.getEncodedSubjectPublicKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE), new RSAPublicKeyStructure(getModulus(), getPublicExponent()));
95    }
96
97    public int hashCode()
98    {
99        return this.getModulus().hashCode() ^ this.getPublicExponent().hashCode();
100    }
101
102    public boolean equals(Object o)
103    {
104        if (o == this)
105        {
106            return true;
107        }
108
109        if (!(o instanceof RSAPublicKey))
110        {
111            return false;
112        }
113
114        RSAPublicKey key = (RSAPublicKey)o;
115
116        return getModulus().equals(key.getModulus())
117            && getPublicExponent().equals(key.getPublicExponent());
118    }
119
120    public String toString()
121    {
122        StringBuffer    buf = new StringBuffer();
123        String          nl = System.getProperty("line.separator");
124
125        buf.append("RSA Public Key").append(nl);
126        buf.append("            modulus: ").append(this.getModulus().toString(16)).append(nl);
127        buf.append("    public exponent: ").append(this.getPublicExponent().toString(16)).append(nl);
128
129        return buf.toString();
130    }
131}
132