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/**
* EdDSA-Java by str4d
*
* To the extent possible under law, the person who associated CC0 with
* EdDSA-Java has waived all copyright and related or neighboring rights
* to EdDSA-Java.
*
* You should have received a copy of the CC0 legalcode along with this
* work. If not, see <https://creativecommons.org/publicdomain/zero/1.0/>.
*
*/
package net.i2p.crypto.eddsa.math.bigint;
import java.math.BigInteger;
import net.i2p.crypto.eddsa.math.Field;
import net.i2p.crypto.eddsa.math.ScalarOps;
public class BigIntegerScalarOps implements ScalarOps {
private final BigInteger l;
private final BigIntegerLittleEndianEncoding enc;
public BigIntegerScalarOps(Field f, BigInteger l) {
this.l = l;
enc = new BigIntegerLittleEndianEncoding();
enc.setField(f);
}
public byte[] reduce(byte[] s) {
return enc.encode(enc.toBigInteger(s).mod(l));
}
public byte[] multiplyAndAdd(byte[] a, byte[] b, byte[] c) {
return enc.encode(enc.toBigInteger(a).multiply(enc.toBigInteger(b)).add(enc.toBigInteger(c)).mod(l));
}
}
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