org.whispersystems.curve25519.java.fe_isnonzero Maven / Gradle / Ivy
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Curve25519 library for Java
package org.whispersystems.curve25519.java;
public class fe_isnonzero {
//CONVERT #include "fe.h"
//CONVERT #include "crypto_verify_32.crypto_verify_32.h"
/*
return 1 if f == 0
return 0 if f != 0
Preconditions:
|f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
*/
static final byte[] zero = new byte[32];
public static int fe_isnonzero(int[] f)
{
byte[] s = new byte[32];
fe_tobytes.fe_tobytes(s,f);
return crypto_verify_32.crypto_verify_32(s,zero);
}
}