Example usage for org.bouncycastle.asn1.sec SECObjectIdentifiers secp384r1

Introduction

In this page you can find the example usage for org.bouncycastle.asn1.sec SECObjectIdentifiers secp384r1.

Prototype

ASN1ObjectIdentifier secp384r1

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Document

secp384r1 OID: 1.3.132.0.34

Usage

From source file:ca.trustpoint.m2m.util.KeyConversionUtils.java

License:Apache License

/**
 * Constructs a PublicKey object from raw EC public key data.
 *
 * @param rawKey Raw EC public key data.
 * @return A PublicKey object constructed from the raw EC public key data.
 *
 * @throws InvalidKeyException if key type or length is unrecognized.
 * @throws IOException if raw data reading error.
 *///from   w ww. j av  a2 s  . c  o m
public static PublicKey convertRawBytestoEcPublicKey(byte[] rawKey)
        throws IllegalArgumentException, InvalidKeyException, IOException {
    if (rawKey == null) {
        throw new IllegalArgumentException("rawKey cannot be null.");
    }

    if (Security.getProvider(BouncyCastleProvider.PROVIDER_NAME) == null) {
        Security.addProvider(new BouncyCastleProvider());
    }

    boolean isCompressed = isCompressedEcPoint(rawKey);

    X962Parameters params = null;
    int keyCompressedLength = 0;

    // Obtain the length of the compressed public key
    if (isCompressed) {
        keyCompressedLength = rawKey.length;
    } else {
        keyCompressedLength = (rawKey.length - 1) / 2 + 1;
    }

    switch (keyCompressedLength) {
    case 25: // compressed 192 curve
        params = new X962Parameters(X9ObjectIdentifiers.prime192v1);
        break;
    case 29: // compressed 224 curve
        params = new X962Parameters(SECObjectIdentifiers.secp224r1);
        break;
    case 31: // compressed 233 curve
        params = new X962Parameters(SECObjectIdentifiers.sect233r1);
        break;
    case 33: // compressed 256 curve
        params = new X962Parameters(X9ObjectIdentifiers.prime256v1);
        break;
    case 49: // compressed 384 curve
        params = new X962Parameters(SECObjectIdentifiers.secp384r1);
        break;
    case 67: // compressed 521 curve
        params = new X962Parameters(SECObjectIdentifiers.secp521r1);
        break;
    default:
        throw new InvalidKeyException("unrecognized public key length: (" + keyCompressedLength + ")");
    }

    AlgorithmIdentifier algId = new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey,
            params.toASN1Primitive());
    SubjectPublicKeyInfo info = new SubjectPublicKeyInfo(algId, rawKey);

    BCECPublicKey key = (BCECPublicKey) BouncyCastleProvider.getPublicKey(info);
    if (isCompressed) {
        key.setPointFormat("COMPRESSED");
    }

    return key;
}

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