/**
* Converts, if possible, a key specification into a {@link BCMcElieceCCA2PrivateKey}. Currently,
* the following key specifications are supported: {@link McElieceCCA2PrivateKeySpec}, {@link
* PKCS8EncodedKeySpec}.
*
* @param keySpec the key specification
* @return the McEliece CCA2 private key
* @throws InvalidKeySpecException if the KeySpec is not supported.
*/
public PrivateKey generatePrivate(KeySpec keySpec) throws InvalidKeySpecException {
if (keySpec instanceof McElieceCCA2PrivateKeySpec) {
return new BCMcElieceCCA2PrivateKey((McElieceCCA2PrivateKeySpec) keySpec);
} else if (keySpec instanceof PKCS8EncodedKeySpec) {
// get the DER-encoded Key according to PKCS#8 from the spec
byte[] encKey = ((PKCS8EncodedKeySpec) keySpec).getEncoded();
// decode the PKCS#8 data structure to the pki object
PrivateKeyInfo pki;
try {
pki = PrivateKeyInfo.getInstance(ASN1Primitive.fromByteArray(encKey));
} catch (IOException e) {
throw new InvalidKeySpecException("Unable to decode PKCS8EncodedKeySpec: " + e);
}
try {
// get the inner type inside the BIT STRING
ASN1Primitive innerType = pki.parsePrivateKey().toASN1Primitive();
// build and return the actual key
ASN1Sequence privKey = (ASN1Sequence) innerType;
// decode oidString (but we don't need it right now)
String oidString = ((ASN1ObjectIdentifier) privKey.getObjectAt(0)).toString();
// decode <n>
BigInteger bigN = ((ASN1Integer) privKey.getObjectAt(1)).getValue();
int n = bigN.intValue();
// decode <k>
BigInteger bigK = ((ASN1Integer) privKey.getObjectAt(2)).getValue();
int k = bigK.intValue();
// decode <fieldPoly>
byte[] encFieldPoly = ((ASN1OctetString) privKey.getObjectAt(3)).getOctets();
// decode <goppaPoly>
byte[] encGoppaPoly = ((ASN1OctetString) privKey.getObjectAt(4)).getOctets();
// decode <p>
byte[] encP = ((ASN1OctetString) privKey.getObjectAt(5)).getOctets();
// decode <h>
byte[] encH = ((ASN1OctetString) privKey.getObjectAt(6)).getOctets();
// decode <qInv>
ASN1Sequence qSeq = (ASN1Sequence) privKey.getObjectAt(7);
byte[][] encQInv = new byte[qSeq.size()][];
for (int i = 0; i < qSeq.size(); i++) {
encQInv[i] = ((ASN1OctetString) qSeq.getObjectAt(i)).getOctets();
}
return new BCMcElieceCCA2PrivateKey(
new McElieceCCA2PrivateKeySpec(
OID, n, k, encFieldPoly, encGoppaPoly, encP, encH, encQInv));
} catch (IOException cce) {
throw new InvalidKeySpecException("Unable to decode PKCS8EncodedKeySpec.");
}
}
throw new InvalidKeySpecException("Unsupported key specification: " + keySpec.getClass() + ".");
}
public PrivateKey generatePrivate(PrivateKeyInfo pki) throws InvalidKeySpecException {
// get the inner type inside the BIT STRING
try {
ASN1Primitive innerType = pki.parsePrivateKey().toASN1Primitive();
McElieceCCA2PrivateKey key = McElieceCCA2PrivateKey.getInstance(innerType);
return new BCMcElieceCCA2PrivateKey(
key.getOID().getId(),
key.getN(),
key.getK(),
key.getField(),
key.getGoppaPoly(),
key.getP(),
key.getH(),
key.getQInv());
} catch (IOException cce) {
throw new InvalidKeySpecException("Unable to decode PKCS8EncodedKeySpec");
}
}
private PemObject createPemObject(Object o) throws IOException {
String type;
byte[] encoding;
if (o instanceof PemObject) {
return (PemObject) o;
}
if (o instanceof PemObjectGenerator) {
return ((PemObjectGenerator) o).generate();
}
if (o instanceof X509Certificate) {
type = "CERTIFICATE";
try {
encoding = ((X509Certificate) o).getEncoded();
} catch (CertificateEncodingException e) {
throw new PemGenerationException("Cannot encode object: " + e.toString());
}
} else if (o instanceof X509CRL) {
type = "X509 CRL";
try {
encoding = ((X509CRL) o).getEncoded();
} catch (CRLException e) {
throw new PemGenerationException("Cannot encode object: " + e.toString());
}
} else if (o instanceof KeyPair) {
return createPemObject(((KeyPair) o).getPrivate());
} else if (o instanceof PrivateKey) {
PrivateKeyInfo info =
new PrivateKeyInfo((ASN1Sequence) ASN1Primitive.fromByteArray(((Key) o).getEncoded()));
if (o instanceof RSAPrivateKey) {
type = "RSA PRIVATE KEY";
encoding = info.parsePrivateKey().toASN1Primitive().getEncoded();
} else if (o instanceof DSAPrivateKey) {
type = "DSA PRIVATE KEY";
DSAParameter p = DSAParameter.getInstance(info.getPrivateKeyAlgorithm().getParameters());
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new DERInteger(0));
v.add(new DERInteger(p.getP()));
v.add(new DERInteger(p.getQ()));
v.add(new DERInteger(p.getG()));
BigInteger x = ((DSAPrivateKey) o).getX();
BigInteger y = p.getG().modPow(x, p.getP());
v.add(new DERInteger(y));
v.add(new DERInteger(x));
encoding = new DERSequence(v).getEncoded();
} else if (((PrivateKey) o).getAlgorithm().equals("ECDSA")) {
type = "EC PRIVATE KEY";
encoding = info.parsePrivateKey().toASN1Primitive().getEncoded();
} else {
throw new IOException("Cannot identify private key");
}
} else if (o instanceof PublicKey) {
type = "PUBLIC KEY";
encoding = ((PublicKey) o).getEncoded();
} else if (o instanceof X509AttributeCertificate) {
type = "ATTRIBUTE CERTIFICATE";
encoding = ((X509V2AttributeCertificate) o).getEncoded();
} else if (o instanceof PKCS10CertificationRequest) {
type = "CERTIFICATE REQUEST";
encoding = ((PKCS10CertificationRequest) o).getEncoded();
} else if (o instanceof ContentInfo) {
type = "PKCS7";
encoding = ((ContentInfo) o).getEncoded();
} else {
throw new PemGenerationException("unknown object passed - can't encode.");
}
return new PemObject(type, encoding);
}
private PemObject createPemObject(
Object obj, String algorithm, char[] password, SecureRandom random) throws IOException {
if (obj instanceof KeyPair) {
return createPemObject(((KeyPair) obj).getPrivate(), algorithm, password, random);
}
String type = null;
byte[] keyData = null;
if (obj instanceof RSAPrivateCrtKey) {
type = "RSA PRIVATE KEY";
RSAPrivateCrtKey k = (RSAPrivateCrtKey) obj;
org.bouncycastle.asn1.pkcs.RSAPrivateKey keyStruct =
new org.bouncycastle.asn1.pkcs.RSAPrivateKey(
k.getModulus(),
k.getPublicExponent(),
k.getPrivateExponent(),
k.getPrimeP(),
k.getPrimeQ(),
k.getPrimeExponentP(),
k.getPrimeExponentQ(),
k.getCrtCoefficient());
// convert to bytearray
keyData = keyStruct.getEncoded();
} else if (obj instanceof DSAPrivateKey) {
type = "DSA PRIVATE KEY";
DSAPrivateKey k = (DSAPrivateKey) obj;
DSAParams p = k.getParams();
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new DERInteger(0));
v.add(new DERInteger(p.getP()));
v.add(new DERInteger(p.getQ()));
v.add(new DERInteger(p.getG()));
BigInteger x = k.getX();
BigInteger y = p.getG().modPow(x, p.getP());
v.add(new DERInteger(y));
v.add(new DERInteger(x));
keyData = new DERSequence(v).getEncoded();
} else if (obj instanceof PrivateKey && "ECDSA".equals(((PrivateKey) obj).getAlgorithm())) {
type = "EC PRIVATE KEY";
PrivateKeyInfo privInfo =
PrivateKeyInfo.getInstance(ASN1Primitive.fromByteArray(((PrivateKey) obj).getEncoded()));
keyData = privInfo.parsePrivateKey().toASN1Primitive().getEncoded();
}
if (type == null || keyData == null) {
// TODO Support other types?
throw new IllegalArgumentException("Object type not supported: " + obj.getClass().getName());
}
String dekAlgName = Strings.toUpperCase(algorithm);
// Note: For backward compatibility
if (dekAlgName.equals("DESEDE")) {
dekAlgName = "DES-EDE3-CBC";
}
int ivLength = dekAlgName.startsWith("AES-") ? 16 : 8;
byte[] iv = new byte[ivLength];
random.nextBytes(iv);
byte[] encData = PEMUtilities.crypt(true, provider, keyData, password, dekAlgName, iv);
List headers = new ArrayList(2);
headers.add(new PemHeader("Proc-Type", "4,ENCRYPTED"));
headers.add(new PemHeader("DEK-Info", dekAlgName + "," + getHexEncoded(iv)));
return new PemObject(type, headers, encData);
}
