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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;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import net.i2p.crypto.eddsa.Utils;
import net.i2p.crypto.eddsa.spec.EdDSANamedCurveSpec;
import net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable;
public class PrecomputationTestVectors {
// Test files were generated using base.py and base2.py from ref10
// (by printing hex(x%q) instead of the radix-255 representation).
static GroupElement[][] testPrecmp = getPrecomputation("basePrecmp");
static GroupElement[] testDblPrecmp = getDoublePrecomputation("baseDblPrecmp");
public static GroupElement[][] getPrecomputation(String fileName) {
EdDSANamedCurveSpec ed25519 = EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.ED_25519);
Curve curve = ed25519.getCurve();
Field field = curve.getField();
GroupElement[][] precmp = new GroupElement[32][8];
BufferedReader file = null;
int row = 0, col = 0;
try {
InputStream is = PrecomputationTestVectors.class.getResourceAsStream(fileName);
if (is == null)
throw new IOException("Resource not found: " + fileName);
file = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = file.readLine()) != null) {
if (line.equals(" },"))
col += 1;
else if (line.equals("},")) {
col = 0;
row += 1;
} else if (line.startsWith(" { ")) {
String ypxStr = line.substring(4, line.lastIndexOf(' '));
FieldElement ypx = field.fromByteArray(
Utils.hexToBytes(ypxStr));
line = file.readLine();
String ymxStr = line.substring(4, line.lastIndexOf(' '));
FieldElement ymx = field.fromByteArray(
Utils.hexToBytes(ymxStr));
line = file.readLine();
String xy2dStr = line.substring(4, line.lastIndexOf(' '));
FieldElement xy2d = field.fromByteArray(
Utils.hexToBytes(xy2dStr));
precmp[row][col] = GroupElement.precomp(curve,
ypx, ymx, xy2d);
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (file != null) try { file.close(); } catch (IOException e) {}
}
return precmp;
}
public static GroupElement[] getDoublePrecomputation(String fileName) {
EdDSANamedCurveSpec ed25519 = EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.ED_25519);
Curve curve = ed25519.getCurve();
Field field = curve.getField();
GroupElement[] dblPrecmp = new GroupElement[8];
BufferedReader file = null;
int row = 0;
try {
InputStream is = PrecomputationTestVectors.class.getResourceAsStream(fileName);
if (is == null)
throw new IOException("Resource not found: " + fileName);
file = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = file.readLine()) != null) {
if (line.equals(" },")) {
row += 1;
} else if (line.startsWith(" { ")) {
String ypxStr = line.substring(4, line.lastIndexOf(' '));
FieldElement ypx = field.fromByteArray(
Utils.hexToBytes(ypxStr));
line = file.readLine();
String ymxStr = line.substring(4, line.lastIndexOf(' '));
FieldElement ymx = field.fromByteArray(
Utils.hexToBytes(ymxStr));
line = file.readLine();
String xy2dStr = line.substring(4, line.lastIndexOf(' '));
FieldElement xy2d = field.fromByteArray(
Utils.hexToBytes(xy2dStr));
dblPrecmp[row] = GroupElement.precomp(curve,
ypx, ymx, xy2d);
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (file != null) try { file.close(); } catch (IOException e) {}
}
return dblPrecmp;
}
}
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