gnu.java.security.sig.rsa
Class RSAPKCS1V1_5SignatureX509Codec
- ISignatureCodec
An implementation of an
ISignatureCodec that knows to encode and
decode RSA PKCS1 (v1.5) signatures into the raw bytes which would constitute
a DER-encoded form of the ASN.1 structure defined in RFC-2459, and RFC-2313
as described in the next paragraphs.
Digital signatures when transmitted in an X.509 certificates are encoded
in DER (Distinguished Encoding Rules) as a BIT STRING; i.e.
Certificate ::= SEQUENCE {
tbsCertificate TBSCertificate,
signatureAlgorithm AlgorithmIdentifier,
signature BIT STRING
}
The output of the encoder, and the input of the decoder, of this codec are
then the
raw bytes of such a BIT STRING; i.e. not the DER-encoded
form itself.
Our implementation of the RSA PKCS1 signature algorithm outputs a byte array
as the result of generating a digital signature, in accordance with RFC-2313.
As a consequence, the encoder and decoder of this codec, simply pass through
such a byte array.
Client code that needs to build a DER BIT STRING
MUST construct such
an ASN.1 value. The following is an example of how to do this:
...
import gnu.java.security.der.BitString;
import gnu.java.security.der.DER;
import gnu.java.security.der.DERValue;
...
DERValue bitString = new DERValue(DER.BIT_STRING, new BitString(sigBytes));
...
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
decodeSignature
public Object decodeSignature(byte[] input)
Decodes a signature as defined in the documentation of this class.
- decodeSignature in interface ISignatureCodec
input - the byte array to unmarshall into a valid RSA PKCS1 (v1.5)
signature instance; i.e. a byte array. MUST NOT be null.
- an array of raw bytes decoded from the designated input. In the
case of RSA PKCS1 (v1.5) this is the same as the input.
encodeSignature
public byte[] encodeSignature(Object signature)
Encodes an RSA Signature output as a signature BIT STRING as
defined in the documentation of this class.
- encodeSignature in interface ISignatureCodec
signature - the output of the RSA PKCS1 (v1.5) signature algorithm;
i.e. the value returned by the invocation of
ISignature.sign() method. In the
case of the RSA PKCS1 (v1.5) signature this is an array of bytes.
- the raw bytes of an RSA signature which could be then used as the
contents of a BIT STRING as per rfc-2459.
RSAPSSSignatureX509Codec.java -- X.509 encoder/decoder for RSA signatures
Copyright (C) 2006 Free Software Foundation, Inc.
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