Example usage for org.bouncycastle.crypto.digests SHA256Digest getByteLength

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.digests SHA256Digest getByteLength.

Prototype

public int getByteLength() 

Source Link

Usage

From source file:com.facebook.delegatedrecovery.CountersignedRecoveryToken.java

License:Open Source License

/**
 * Utility method to quickly get a hex-encoded SHA256 digest of the data field
 * of the countersigned token, which contains the original token.
 * /* w ww. j a va  2s.  c  o m*/
 * @return hex encoded string of SHA256 digest
 */
public String getInnerTokenHash() {
    final SHA256Digest digest = new SHA256Digest();
    final byte[] hash = new byte[digest.getByteLength()];
    digest.update(data, 0, data.length);
    digest.doFinal(hash, 0);
    return DelegatedRecoveryUtils.encodeHex(hash);
}

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From source file:com.facebook.delegatedrecovery.DelegatedRecoveryUtils.java

License:Open Source License

/**
 * Simple utility method to return a hex-encoded string of the SHA256 digest
 * of a byte[]//from  w  ww .jav a2s  . c  o  m
 * 
 * @param bytes The bytes to encode
 * @return The hex encoded bytes in a String
 */
public static String sha256(final byte[] bytes) {
    // hash of the token to re-identify it later
    final SHA256Digest digest = new SHA256Digest();
    final byte[] hash = new byte[digest.getByteLength()];
    digest.update(bytes, 0, bytes.length);
    digest.doFinal(hash, 0);
    return DelegatedRecoveryUtils.encodeHex(hash);
}

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From source file:com.facebook.delegatedrecovery.RecoveryToken.java

License:Open Source License

private byte[] getSignature(final byte[] rawArray, final ECPrivateKey privateKey) throws IOException {
    if (this.signature != null) {
        throw new IllegalStateException("This token already has a signature.");
    }// w ww .  jav  a  2  s.  co  m
    final BigInteger privatePoint = privateKey.getS();

    final SHA256Digest digest = new SHA256Digest();
    final byte[] hash = new byte[digest.getByteLength()];
    digest.update(rawArray, 0, rawArray.length);
    digest.doFinal(hash, 0);

    final ECDSASigner signer = new ECDSASigner(new HMacDSAKCalculator(new SHA256Digest()));
    signer.init(true, new ECPrivateKeyParameters(privatePoint, DelegatedRecoveryUtils.P256_DOMAIN_PARAMS));
    final BigInteger[] signature = signer.generateSignature(hash);
    final ByteArrayOutputStream s = new ByteArrayOutputStream();
    final DERSequenceGenerator seq = new DERSequenceGenerator(s);
    seq.addObject(new ASN1Integer(signature[0]));
    seq.addObject(new ASN1Integer(signature[1]));
    seq.close();

    return s.toByteArray();
}

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