Interface Extension
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public interface ExtensionThis interface represents an X.509 extension.Extensions provide a means of associating additional attributes with users or public keys and for managing a certification hierarchy. The extension format also allows communities to define private extensions to carry information unique to those communities.
Each extension contains an object identifier, a criticality setting indicating whether it is a critical or a non-critical extension, and and an ASN.1 DER-encoded value. Its ASN.1 definition is:
Extension ::= SEQUENCE { extnId OBJECT IDENTIFIER, critical BOOLEAN DEFAULT FALSE, extnValue OCTET STRING -- contains a DER encoding of a value -- of the type registered for use with -- the extnId object identifier value }This interface is designed to provide access to a single extension, unlike
X509Extensionwhich is more suitable for accessing a set of extensions.- Since:
- 1.7
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method and Description voidencode(OutputStream out)Generates the extension's DER encoding and writes it to the output stream.StringgetId()Gets the extensions's object identifier.byte[]getValue()Gets the extensions's DER-encoded value.booleanisCritical()Gets the extension's criticality setting.
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Method Detail
getId
String getId()
Gets the extensions's object identifier.- Returns:
- the object identifier as a String
isCritical
boolean isCritical()
Gets the extension's criticality setting.- Returns:
- true if this is a critical extension.
getValue
byte[] getValue()
Gets the extensions's DER-encoded value. Note, this is the bytes that are encoded as an OCTET STRING. It does not include the OCTET STRING tag and length.- Returns:
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a copy of the extension's value, or
nullif no extension value is present.
encode
void encode(OutputStream out) throws IOException
Generates the extension's DER encoding and writes it to the output stream.- Parameters:
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out- the output stream - Throws:
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IOException- on encoding or output error. -
NullPointerException- ifoutisnull.
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