org.bouncycastle.pqc.crypto.crystals.kyber.PolyVec Maven / Gradle / Ivy
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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
package org.bouncycastle.pqc.crypto.crystals.kyber;
import org.bouncycastle.util.Arrays;
class PolyVec
{
Poly[] vec;
private KyberEngine engine;
private int kyberK;
private int polyVecBytes;
public PolyVec(KyberEngine engine)
{
this.engine = engine;
this.kyberK = engine.getKyberK();
this.polyVecBytes = engine.getKyberPolyVecBytes();
this.vec = new Poly[kyberK];
for (int i = 0; i < kyberK; i++)
{
vec[i] = new Poly(engine);
}
}
public PolyVec()
throws Exception
{
throw new Exception("Requires Parameter");
}
public Poly getVectorIndex(int i)
{
return vec[i];
}
public void polyVecNtt()
{
int i;
for (i = 0; i < kyberK; i++)
{
this.getVectorIndex(i).polyNtt();
}
}
public void polyVecInverseNttToMont()
{
for (int i = 0; i < kyberK; i++)
{
this.getVectorIndex(i).polyInverseNttToMont();
}
}
public byte[] compressPolyVec()
{
int i, j, k;
this.conditionalSubQ();
short[] t;
byte[] r = new byte[engine.getKyberPolyVecCompressedBytes()];
int count = 0;
if (engine.getKyberPolyVecCompressedBytes() == kyberK * 320)
{
t = new short[4];
for (i = 0; i < kyberK; i++)
{
for (j = 0; j < KyberEngine.KyberN / 4; j++)
{
for (k = 0; k < 4; k++)
{
t[k] = (short)
(
(
((this.getVectorIndex(i).getCoeffIndex(4 * j + k) << 10)
+ (KyberEngine.KyberQ / 2))
/ KyberEngine.KyberQ)
& 0x3ff);
}
r[count + 0] = (byte)(t[0] >> 0);
r[count + 1] = (byte)((t[0] >> 8) | (t[1] << 2));
r[count + 2] = (byte)((t[1] >> 6) | (t[2] << 4));
r[count + 3] = (byte)((t[2] >> 4) | (t[3] << 6));
r[count + 4] = (byte)((t[3] >> 2));
count += 5;
}
}
}
else if (engine.getKyberPolyVecCompressedBytes() == kyberK * 352)
{
t = new short[8];
for (i = 0; i < kyberK; i++)
{
for (j = 0; j < KyberEngine.KyberN / 8; j++)
{
for (k = 0; k < 8; k++)
{
t[k] = (short)
(
(
((this.getVectorIndex(i).getCoeffIndex(8 * j + k) << 11)
+ (KyberEngine.KyberQ / 2))
/ KyberEngine.KyberQ)
& 0x7ff);
}
r[count + 0] = (byte)((t[0] >> 0));
r[count + 1] = (byte)((t[0] >> 8) | (t[1] << 3));
r[count + 2] = (byte)((t[1] >> 5) | (t[2] << 6));
r[count + 3] = (byte)((t[2] >> 2));
r[count + 4] = (byte)((t[2] >> 10) | (t[3] << 1));
r[count + 5] = (byte)((t[3] >> 7) | (t[4] << 4));
r[count + 6] = (byte)((t[4] >> 4) | (t[5] << 7));
r[count + 7] = (byte)((t[5] >> 1));
r[count + 8] = (byte)((t[5] >> 9) | (t[6] << 2));
r[count + 9] = (byte)((t[6] >> 6) | (t[7] << 5));
r[count + 10] = (byte)((t[7] >> 3));
count += 11;
}
}
}
else
{
throw new RuntimeException("Kyber PolyVecCompressedBytes neither 320 * KyberK or 352 * KyberK!");
}
return r;
}
public void decompressPolyVec(byte[] compressedPolyVecCipherText)
{
int i, j, k, count = 0;
if (engine.getKyberPolyVecCompressedBytes() == (kyberK * 320))
{
short[] t = new short[4];
for (i = 0; i < kyberK; i++)
{
for (j = 0; j < KyberEngine.KyberN / 4; j++)
{
t[0] = (short)(((compressedPolyVecCipherText[count] & 0xFF) >> 0) | (short)((compressedPolyVecCipherText[count + 1] & 0xFF) << 8));
t[1] = (short)(((compressedPolyVecCipherText[count + 1] & 0xFF) >> 2) | (short)((compressedPolyVecCipherText[count + 2] & 0xFF) << 6));
t[2] = (short)(((compressedPolyVecCipherText[count + 2] & 0xFF) >> 4) | (short)((compressedPolyVecCipherText[count + 3] & 0xFF) << 4));
t[3] = (short)(((compressedPolyVecCipherText[count + 3] & 0xFF) >> 6) | (short)((compressedPolyVecCipherText[count + 4] & 0xFF) << 2));
count += 5;
for (k = 0; k < 4; k++)
{
this.vec[i].setCoeffIndex(4 * j + k, (short)(((t[k] & 0x3FF) * KyberEngine.KyberQ + 512) >> 10));
}
}
}
}
else if (engine.getKyberPolyVecCompressedBytes() == (kyberK * 352))
{
short[] t = new short[8];
for (i = 0; i < kyberK; i++)
{
for (j = 0; j < KyberEngine.KyberN / 8; j++)
{
t[0] = (short)(((compressedPolyVecCipherText[count] & 0xFF) >> 0) | ((short)(compressedPolyVecCipherText[count + 1] & 0xFF) << 8));
t[1] = (short)(((compressedPolyVecCipherText[count + 1] & 0xFF) >> 3) | ((short)(compressedPolyVecCipherText[count + 2] & 0xFF) << 5));
t[2] = (short)(((compressedPolyVecCipherText[count + 2] & 0xFF) >> 6) | ((short)(compressedPolyVecCipherText[count + 3] & 0xFF) << 2) | ((short)((compressedPolyVecCipherText[count + 4] & 0xFF) << 10)));
t[3] = (short)(((compressedPolyVecCipherText[count + 4] & 0xFF) >> 1) | ((short)(compressedPolyVecCipherText[count + 5] & 0xFF) << 7));
t[4] = (short)(((compressedPolyVecCipherText[count + 5] & 0xFF) >> 4) | ((short)(compressedPolyVecCipherText[count + 6] & 0xFF) << 4));
t[5] = (short)(((compressedPolyVecCipherText[count + 6] & 0xFF) >> 7) | ((short)(compressedPolyVecCipherText[count + 7] & 0xFF) << 1) | ((short)((compressedPolyVecCipherText[count + 8] & 0xFF) << 9)));
t[6] = (short)(((compressedPolyVecCipherText[count + 8] & 0xFF) >> 2) | ((short)(compressedPolyVecCipherText[count + 9] & 0xFF) << 6));
t[7] = (short)(((compressedPolyVecCipherText[count + 9] & 0xFF) >> 5) | ((short)(compressedPolyVecCipherText[count + 10] & 0xFF) << 3));
count += 11;
for (k = 0; k < 8; k++)
{
this.vec[i].setCoeffIndex(8 * j + k, (short)(((t[k] & 0x7FF) * KyberEngine.KyberQ + 1024) >> 11));
}
}
}
}
else
{
throw new RuntimeException("Kyber PolyVecCompressedBytes neither 320 * KyberK or 352 * KyberK!");
}
}
public static void pointwiseAccountMontgomery(Poly out, PolyVec inp1, PolyVec inp2, KyberEngine engine)
{
int i;
Poly t = new Poly(engine);
Poly.baseMultMontgomery(out, inp1.getVectorIndex(0), inp2.getVectorIndex(0));
for (i = 1; i < engine.getKyberK(); i++)
{
Poly.baseMultMontgomery(t, inp1.getVectorIndex(i), inp2.getVectorIndex(i));
out.addCoeffs(t);
}
out.reduce();
}
public void reducePoly()
{
int i;
for (i = 0; i < kyberK; i++)
{
this.getVectorIndex(i).reduce();
}
}
public void addPoly(PolyVec b)
{
int i;
for (i = 0; i < kyberK; i++)
{
this.getVectorIndex(i).addCoeffs(b.getVectorIndex(i));
}
}
public byte[] toBytes()
{
byte[] r = new byte[polyVecBytes];
for (int i = 0; i < kyberK; i++)
{
System.arraycopy(this.vec[i].toBytes(), 0, r, i * KyberEngine.KyberPolyBytes, KyberEngine.KyberPolyBytes);
}
return r;
}
public void fromBytes(byte[] inputBytes)
{
for (int i = 0; i < kyberK; i++)
{
this.getVectorIndex(i).fromBytes(Arrays.copyOfRange(inputBytes, i * KyberEngine.KyberPolyBytes, (i + 1) * KyberEngine.KyberPolyBytes));
}
}
public void conditionalSubQ()
{
for (int i = 0; i < kyberK; i++)
{
this.getVectorIndex(i).conditionalSubQ();
}
}
public String toString()
{
StringBuffer out = new StringBuffer();
out.append("[");
for (int i = 0; i < kyberK; i++)
{
out.append(vec[i].toString());
if (i != kyberK - 1)
{
out.append(", ");
}
}
out.append("]");
return out.toString();
}
}
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