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package model.pki;
import model.asn1.ASN1Object;
import model.asn1.BitString;
import model.asn1.Tag;
import model.asn1.exceptions.ParseException;
import model.asn1.parsing.BytesReader;
import java.util.Arrays;
import java.util.Collection;
import java.util.stream.Stream;
/**
* Represents the following ASN.1 structure:
* <pre>
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier{{SupportedAlgorithms}},
* subjectPublicKey BIT STRING,
* ... }
* </pre>
* It represents the public key of a subject, in a certificate.
*/
public class SubjectPublicKeyInfo extends ASN1Object {
/**
* The algorithm used.
*/
private final AlgorithmIdentifier algorithm;
/**
* The public key.
*/
private final BitString subjectPublicKey;
/**
* EFFECTS: Init with tags, algorithm, subjectPublicKey. For tags, see {@link ASN1Object}.
* REQUIRES: The public key should be a valid $algorithm key. Algorithm and publicKey should have default UNIVERSAL
* tags (SEQUENCE and BIT STRING).
*/
public SubjectPublicKeyInfo(Tag tag, Tag parentTag,
final AlgorithmIdentifier algorithm,
final BitString subjectPublicKey) {
super(tag, parentTag);
this.algorithm = algorithm;
this.subjectPublicKey = subjectPublicKey;
}
/**
* EFFECTS: Parse input DER.
* Throws {@link ASN1Object} if invalid:
* - Any fields missing (info, algorithm, signature)
* - Any fields having an incorrect tag (as seen in the ASN.1 definition)
* - Any fields with encoding instructions that violate implicit / explicit encoding rules
* - Other issues found during parsing the object, like early EOF (see {@link ASN1Object})
* MODIFIES: this, encoded
*/
public SubjectPublicKeyInfo(BytesReader encoded, boolean hasParentTag) throws ParseException {
super(encoded, hasParentTag);
this.algorithm = new AlgorithmIdentifier(encoded, false);
this.algorithm.getTag().enforce(TAG_SEQUENCE);
this.subjectPublicKey = new BitString(encoded, false);
this.subjectPublicKey.getTag().enforce(BitString.TAG);
}
/**
* EFFECTS: Encode the fields into DER, in the order.
*/
@Override
public Byte[] encodeValueDER() {
return Stream.of(Arrays.asList(algorithm.encodeDER()),
Arrays.asList(subjectPublicKey.encodeDER()))
.flatMap(Collection::stream)
.toArray(Byte[]::new);
}
public AlgorithmIdentifier getAlgorithm() {
return algorithm;
}
public BitString getSubjectPublicKey() {
return subjectPublicKey;
}
}
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