Example usage for org.bouncycastle.crypto.generators SCrypt generate

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.generators SCrypt generate.

Prototype

public static byte[] generate(byte[] P, byte[] S, int N, int r, int p, int dkLen) 

Source Link

Document

Generate a key using the scrypt key derivation function.

Usage

From source file:org.springframework.security.crypto.scrypt.SCryptPasswordEncoder.java

License:Apache License

private boolean decodeAndCheckMatches(CharSequence rawPassword, String encodedPassword) {
    String[] parts = encodedPassword.split("\\$");

    if (parts.length != 4) {
        return false;
    }/*from w w w . java  2  s.  c  o  m*/

    long params = Long.parseLong(parts[1], 16);
    byte[] salt = decodePart(parts[2]);
    byte[] derived = decodePart(parts[3]);

    int cpuCost = (int) Math.pow(2, params >> 16 & 0xffff);
    int memoryCost = (int) params >> 8 & 0xff;
    int parallelization = (int) params & 0xff;

    byte[] generated = SCrypt.generate(Utf8.encode(rawPassword), salt, cpuCost, memoryCost, parallelization,
            keyLength);

    if (derived.length != generated.length) {
        return false;
    }

    int result = 0;
    for (int i = 0; i < derived.length; i++) {
        result |= derived[i] ^ generated[i];
    }
    return result == 0;
}

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From source file:org.springframework.security.crypto.scrypt.SCryptPasswordEncoder.java

License:Apache License

private String digest(CharSequence rawPassword, byte[] salt) {
    byte[] derived = SCrypt.generate(Utf8.encode(rawPassword), salt, cpuCost, memoryCost, parallelization,
            keyLength);//  w w  w  . java  2  s . co m

    String params = Long
            .toString(((int) (Math.log(cpuCost) / Math.log(2)) << 16L) | memoryCost << 8 | parallelization, 16);

    StringBuilder sb = new StringBuilder((salt.length + derived.length) * 2);
    sb.append("$").append(params).append('$');
    sb.append(encodePart(salt)).append('$');
    sb.append(encodePart(derived));

    return sb.toString();
}

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From source file:org.xwiki.crypto.password.internal.kdf.BcScryptKDF.java

License:Open Source License

@Override
public KeyParameter derive(byte[] password) {
    return new KeyParameter(SCrypt.generate(password, parameters.getSalt(), parameters.getCostParameter(),
            parameters.getBlockSize(), parameters.getParallelizationParameter(), getKeySize()));
}

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From source file:org.xwiki.crypto.password.internal.kdf.BcScryptKDF.java

License:Open Source License

@Override
public KeyWithIVParameters derive(byte[] password, int ivSize) {
    int keySize = getKeySize();
    byte[] keyIV = SCrypt.generate(password, parameters.getSalt(), parameters.getCostParameter(),
            parameters.getBlockSize(), parameters.getParallelizationParameter(), keySize + ivSize);

    byte[] key = new byte[keySize];
    System.arraycopy(keyIV, 0, key, 0, keySize);

    byte[] iv = new byte[ivSize];
    System.arraycopy(keyIV, keySize, iv, 0, ivSize);

    return new KeyWithIVParameters(key, iv);
}

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From source file:xyz.jamescarroll.genipass.Crypto.ECKey.java

License:Open Source License

/**
 * Calculates the master extended private key using SCrypt.
 *
 * @param u RIPEMD-160 hash of the username.
 * @param p RIPEMD-160 hash of the master password.
 * @return the SCrypt digest/*from w  w  w.j  a v a  2  s .  c o  m*/
 */

private static byte[] calcMasterExtPrivateKey(BigInteger u, BigInteger p) {
    return SCrypt.generate((u.toString() + p.toString()).getBytes(), (u.xor(p)).toByteArray(),
            (int) Math.pow(2, 16), 8, 2, 64);
}

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