diff options
author | David Hook <dgh@cryptoworkshop.com> | 2013-05-31 11:07:45 +0400 |
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committer | David Hook <dgh@cryptoworkshop.com> | 2013-05-31 11:07:45 +0400 |
commit | 2b976f5364cfdbc37d3086019d93483c983eb80b (patch) | |
tree | cb846af3fd1d43f9c2562a1fb2d06b997ad8f229 /core/src/main/java/org/bouncycastle/asn1/DERInteger.java | |
parent | 5f714bd92fbd780d22406f4bc3681be005f6f04a (diff) |
initial reshuffle
Diffstat (limited to 'core/src/main/java/org/bouncycastle/asn1/DERInteger.java')
-rw-r--r-- | core/src/main/java/org/bouncycastle/asn1/DERInteger.java | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/core/src/main/java/org/bouncycastle/asn1/DERInteger.java b/core/src/main/java/org/bouncycastle/asn1/DERInteger.java new file mode 100644 index 00000000..3804450e --- /dev/null +++ b/core/src/main/java/org/bouncycastle/asn1/DERInteger.java @@ -0,0 +1,148 @@ +package org.bouncycastle.asn1; + +import java.io.IOException; +import java.math.BigInteger; + +import org.bouncycastle.util.Arrays; + +public class DERInteger + extends ASN1Primitive +{ + byte[] bytes; + + /** + * return an integer from the passed in object + * + * @exception IllegalArgumentException if the object cannot be converted. + */ + public static ASN1Integer getInstance( + Object obj) + { + if (obj == null || obj instanceof ASN1Integer) + { + return (ASN1Integer)obj; + } + if (obj instanceof DERInteger) + { + return new ASN1Integer((((DERInteger)obj).getValue())); + } + + if (obj instanceof byte[]) + { + try + { + return (ASN1Integer)fromByteArray((byte[])obj); + } + catch (Exception e) + { + throw new IllegalArgumentException("encoding error in getInstance: " + e.toString()); + } + } + + throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName()); + } + + /** + * return an Integer from a tagged object. + * + * @param obj the tagged object holding the object we want + * @param explicit true if the object is meant to be explicitly + * tagged false otherwise. + * @exception IllegalArgumentException if the tagged object cannot + * be converted. + */ + public static ASN1Integer getInstance( + ASN1TaggedObject obj, + boolean explicit) + { + ASN1Primitive o = obj.getObject(); + + if (explicit || o instanceof DERInteger) + { + return getInstance(o); + } + else + { + return new ASN1Integer(ASN1OctetString.getInstance(obj.getObject()).getOctets()); + } + } + + public DERInteger( + long value) + { + bytes = BigInteger.valueOf(value).toByteArray(); + } + + public DERInteger( + BigInteger value) + { + bytes = value.toByteArray(); + } + + public DERInteger( + byte[] bytes) + { + this.bytes = bytes; + } + + public BigInteger getValue() + { + return new BigInteger(bytes); + } + + /** + * in some cases positive values get crammed into a space, + * that's not quite big enough... + */ + public BigInteger getPositiveValue() + { + return new BigInteger(1, bytes); + } + + boolean isConstructed() + { + return false; + } + + int encodedLength() + { + return 1 + StreamUtil.calculateBodyLength(bytes.length) + bytes.length; + } + + void encode( + ASN1OutputStream out) + throws IOException + { + out.writeEncoded(BERTags.INTEGER, bytes); + } + + public int hashCode() + { + int value = 0; + + for (int i = 0; i != bytes.length; i++) + { + value ^= (bytes[i] & 0xff) << (i % 4); + } + + return value; + } + + boolean asn1Equals( + ASN1Primitive o) + { + if (!(o instanceof DERInteger)) + { + return false; + } + + DERInteger other = (DERInteger)o; + + return Arrays.areEqual(bytes, other.bytes); + } + + public String toString() + { + return getValue().toString(); + } +} |