diff options
Diffstat (limited to 'libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/pkcs/RSAPublicKey.java')
-rw-r--r-- | libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/pkcs/RSAPublicKey.java | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/pkcs/RSAPublicKey.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/pkcs/RSAPublicKey.java new file mode 100644 index 000000000..5ea0172a7 --- /dev/null +++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/pkcs/RSAPublicKey.java @@ -0,0 +1,95 @@ +package org.spongycastle.asn1.pkcs; + +import java.math.BigInteger; +import java.util.Enumeration; + +import org.spongycastle.asn1.ASN1EncodableVector; +import org.spongycastle.asn1.ASN1Integer; +import org.spongycastle.asn1.ASN1Object; +import org.spongycastle.asn1.ASN1Primitive; +import org.spongycastle.asn1.ASN1Sequence; +import org.spongycastle.asn1.ASN1TaggedObject; +import org.spongycastle.asn1.DERSequence; + +public class RSAPublicKey + extends ASN1Object +{ + private BigInteger modulus; + private BigInteger publicExponent; + + public static RSAPublicKey getInstance( + ASN1TaggedObject obj, + boolean explicit) + { + return getInstance(ASN1Sequence.getInstance(obj, explicit)); + } + + public static RSAPublicKey getInstance( + Object obj) + { + if (obj instanceof RSAPublicKey) + { + return (RSAPublicKey)obj; + } + + if (obj != null) + { + return new RSAPublicKey(ASN1Sequence.getInstance(obj)); + } + + return null; + } + + public RSAPublicKey( + BigInteger modulus, + BigInteger publicExponent) + { + this.modulus = modulus; + this.publicExponent = publicExponent; + } + + private RSAPublicKey( + ASN1Sequence seq) + { + if (seq.size() != 2) + { + throw new IllegalArgumentException("Bad sequence size: " + + seq.size()); + } + + Enumeration e = seq.getObjects(); + + modulus = ASN1Integer.getInstance(e.nextElement()).getPositiveValue(); + publicExponent = ASN1Integer.getInstance(e.nextElement()).getPositiveValue(); + } + + public BigInteger getModulus() + { + return modulus; + } + + public BigInteger getPublicExponent() + { + return publicExponent; + } + + /** + * This outputs the key in PKCS1v2 format. + * <pre> + * RSAPublicKey ::= SEQUENCE { + * modulus INTEGER, -- n + * publicExponent INTEGER, -- e + * } + * </pre> + * <p> + */ + public ASN1Primitive toASN1Primitive() + { + ASN1EncodableVector v = new ASN1EncodableVector(); + + v.add(new ASN1Integer(getModulus())); + v.add(new ASN1Integer(getPublicExponent())); + + return new DERSequence(v); + } +} |