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Diffstat (limited to 'prov/src/main/java/org/spongycastle/pqc/jcajce/provider/mceliece/BCMcElieceCCA2PrivateKey.java')
| -rw-r--r-- | prov/src/main/java/org/spongycastle/pqc/jcajce/provider/mceliece/BCMcElieceCCA2PrivateKey.java | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/prov/src/main/java/org/spongycastle/pqc/jcajce/provider/mceliece/BCMcElieceCCA2PrivateKey.java b/prov/src/main/java/org/spongycastle/pqc/jcajce/provider/mceliece/BCMcElieceCCA2PrivateKey.java new file mode 100644 index 00000000..0a22dd6f --- /dev/null +++ b/prov/src/main/java/org/spongycastle/pqc/jcajce/provider/mceliece/BCMcElieceCCA2PrivateKey.java @@ -0,0 +1,307 @@ +package org.spongycastle.pqc.jcajce.provider.mceliece; + +import java.io.IOException; +import java.security.PrivateKey; + +import org.spongycastle.asn1.ASN1ObjectIdentifier; +import org.spongycastle.asn1.ASN1Primitive; +import org.spongycastle.asn1.DERNull; +import org.spongycastle.asn1.pkcs.PrivateKeyInfo; +import org.spongycastle.asn1.x509.AlgorithmIdentifier; +import org.spongycastle.crypto.CipherParameters; +import org.spongycastle.pqc.asn1.McElieceCCA2PrivateKey; +import org.spongycastle.pqc.crypto.mceliece.McElieceCCA2KeyPairGenerator; +import org.spongycastle.pqc.crypto.mceliece.McElieceCCA2Parameters; +import org.spongycastle.pqc.crypto.mceliece.McElieceCCA2PrivateKeyParameters; +import org.spongycastle.pqc.jcajce.spec.McElieceCCA2PrivateKeySpec; +import org.spongycastle.pqc.math.linearalgebra.GF2Matrix; +import org.spongycastle.pqc.math.linearalgebra.GF2mField; +import org.spongycastle.pqc.math.linearalgebra.Permutation; +import org.spongycastle.pqc.math.linearalgebra.PolynomialGF2mSmallM; + +/** + * This class implements a McEliece CCA2 private key and is usually instantiated + * by the {@link McElieceCCA2KeyPairGenerator} or {@link McElieceCCA2KeyFactorySpi}. + * + * @see McElieceCCA2KeyPairGenerator + */ +public class BCMcElieceCCA2PrivateKey + implements CipherParameters, PrivateKey +{ + + + /** + * + */ + private static final long serialVersionUID = 1L; + + // the OID of the algorithm + private String oid; + + // the length of the code + private int n; + + // the dimension of the code, k>=n-mt + private int k; + + // the finte field GF(2^m) + private GF2mField field; + + // the irreducible Goppa polynomial + private PolynomialGF2mSmallM goppaPoly; + + // the permutation + private Permutation p; + + // the canonical check matrix + private GF2Matrix h; + + // the matrix used to compute square roots in (GF(2^m))^t + private PolynomialGF2mSmallM[] qInv; + + private McElieceCCA2Parameters mcElieceCCA2Params; + + /** + * Constructor (used by the {@link McElieceCCA2KeyPairGenerator}). + * + * @param n the length of the code + * @param k the dimension of the code + * @param field the field polynomial + * @param gp the irreducible Goppa polynomial + * @param p the permutation + * @param h the canonical check matrix + * @param qInv the matrix used to compute square roots in + * <tt>(GF(2^m))^t</tt> + */ + public BCMcElieceCCA2PrivateKey(String oid, int n, int k, GF2mField field, + PolynomialGF2mSmallM gp, Permutation p, GF2Matrix h, + PolynomialGF2mSmallM[] qInv) + { + this.oid = oid; + this.n = n; + this.k = k; + this.field = field; + this.goppaPoly = gp; + this.p = p; + this.h = h; + this.qInv = qInv; + } + + /** + * Constructor (used by the {@link McElieceCCA2KeyFactorySpi}). + * + * @param keySpec a {@link McElieceCCA2PrivateKeySpec} + */ + public BCMcElieceCCA2PrivateKey(McElieceCCA2PrivateKeySpec keySpec) + { + this(keySpec.getOIDString(), keySpec.getN(), keySpec.getK(), keySpec.getField(), keySpec + .getGoppaPoly(), keySpec.getP(), keySpec.getH(), keySpec + .getQInv()); + } + + public BCMcElieceCCA2PrivateKey(McElieceCCA2PrivateKeyParameters params) + { + this(params.getOIDString(), params.getN(), params.getK(), params.getField(), params.getGoppaPoly(), + params.getP(), params.getH(), params.getQInv()); + this.mcElieceCCA2Params = params.getParameters(); + } + + /** + * Return the name of the algorithm. + * + * @return "McEliece" + */ + public String getAlgorithm() + { + return "McEliece"; + } + + /** + * @return the length of the code + */ + public int getN() + { + return n; + } + + /** + * @return the dimension of the code + */ + public int getK() + { + return k; + } + + /** + * @return the degree of the Goppa polynomial (error correcting capability) + */ + public int getT() + { + return goppaPoly.getDegree(); + } + + /** + * @return the finite field + */ + public GF2mField getField() + { + return field; + } + + /** + * @return the irreducible Goppa polynomial + */ + public PolynomialGF2mSmallM getGoppaPoly() + { + return goppaPoly; + } + + /** + * @return the permutation vector + */ + public Permutation getP() + { + return p; + } + + /** + * @return the canonical check matrix + */ + public GF2Matrix getH() + { + return h; + } + + /** + * @return the matrix used to compute square roots in <tt>(GF(2^m))^t</tt> + */ + public PolynomialGF2mSmallM[] getQInv() + { + return qInv; + } + + /** + * @return a human readable form of the key + */ + public String toString() + { + String result = ""; + result += " extension degree of the field : " + n + "\n"; + result += " dimension of the code : " + k + "\n"; + result += " irreducible Goppa polynomial : " + goppaPoly + "\n"; + return result; + } + + /** + * Compare this key with another object. + * + * @param other the other object + * @return the result of the comparison + */ + public boolean equals(Object other) + { + if (other == null || !(other instanceof BCMcElieceCCA2PrivateKey)) + { + return false; + } + + BCMcElieceCCA2PrivateKey otherKey = (BCMcElieceCCA2PrivateKey)other; + + return (n == otherKey.n) && (k == otherKey.k) + && field.equals(otherKey.field) + && goppaPoly.equals(otherKey.goppaPoly) && p.equals(otherKey.p) + && h.equals(otherKey.h); + } + + /** + * @return the hash code of this key + */ + public int hashCode() + { + return k + n + field.hashCode() + goppaPoly.hashCode() + p.hashCode() + + h.hashCode(); + } + + /** + * @return the OID of the algorithm + */ + public String getOIDString() + { + return oid; + } + + /** + * @return the OID to encode in the SubjectPublicKeyInfo structure + */ + protected ASN1ObjectIdentifier getOID() + { + return new ASN1ObjectIdentifier(McElieceCCA2KeyFactorySpi.OID); + } + + /** + * @return the algorithm parameters to encode in the SubjectPublicKeyInfo + * structure + */ + protected ASN1Primitive getAlgParams() + { + return null; // FIXME: needed at all? + } + + + /** + * Return the keyData to encode in the SubjectPublicKeyInfo structure. + * <p/> + * The ASN.1 definition of the key structure is + * <p/> + * <pre> + * McEliecePrivateKey ::= SEQUENCE { + * m INTEGER -- extension degree of the field + * k INTEGER -- dimension of the code + * field OCTET STRING -- field polynomial + * goppaPoly OCTET STRING -- irreducible Goppa polynomial + * p OCTET STRING -- permutation vector + * matrixH OCTET STRING -- canonical check matrix + * sqRootMatrix SEQUENCE OF OCTET STRING -- square root matrix + * } + * </pre> + * + * @return the keyData to encode in the SubjectPublicKeyInfo structure + */ + public byte[] getEncoded() + { + McElieceCCA2PrivateKey privateKey = new McElieceCCA2PrivateKey(new ASN1ObjectIdentifier(oid), n, k, field, goppaPoly, p, h, qInv); + PrivateKeyInfo pki; + try + { + AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(this.getOID(), DERNull.INSTANCE); + pki = new PrivateKeyInfo(algorithmIdentifier, privateKey); + } + catch (IOException e) + { + e.printStackTrace(); + return null; + } + try + { + byte[] encoded = pki.getEncoded(); + return encoded; + } + catch (IOException e) + { + e.printStackTrace(); + return null; + } + } + + public String getFormat() + { + // TODO Auto-generated method stub + return null; + } + + public McElieceCCA2Parameters getMcElieceCCA2Parameters() + { + return mcElieceCCA2Params; + } + +} |