diff options
author | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-02-25 08:13:53 +0400 |
---|---|---|
committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-02-25 08:13:53 +0400 |
commit | 51bc04b8181aa036d850d74ef8e05dc8760581fa (patch) | |
tree | 02722bc69f6302386e9180dfc8313048e3f2f201 /core/src/main/java/org/bouncycastle | |
parent | acc74df4eeac1d215999a10316a11302f8776720 (diff) |
Fix line endings
Diffstat (limited to 'core/src/main/java/org/bouncycastle')
-rw-r--r-- | core/src/main/java/org/bouncycastle/crypto/signers/ECGOST3410Signer.java | 310 |
1 files changed, 155 insertions, 155 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/signers/ECGOST3410Signer.java b/core/src/main/java/org/bouncycastle/crypto/signers/ECGOST3410Signer.java index 47dc6bd9..ed256fe8 100644 --- a/core/src/main/java/org/bouncycastle/crypto/signers/ECGOST3410Signer.java +++ b/core/src/main/java/org/bouncycastle/crypto/signers/ECGOST3410Signer.java @@ -1,155 +1,155 @@ -package org.bouncycastle.crypto.signers;
-
-import org.bouncycastle.crypto.CipherParameters;
-import org.bouncycastle.crypto.DSA;
-import org.bouncycastle.crypto.params.ECDomainParameters;
-import org.bouncycastle.crypto.params.ECKeyParameters;
-import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
-import org.bouncycastle.crypto.params.ECPublicKeyParameters;
-import org.bouncycastle.crypto.params.ParametersWithRandom;
-import org.bouncycastle.math.ec.ECAlgorithms;
-import org.bouncycastle.math.ec.ECConstants;
-import org.bouncycastle.math.ec.ECMultiplier;
-import org.bouncycastle.math.ec.ECPoint;
-import org.bouncycastle.math.ec.FixedPointCombMultiplier;
-
-import java.math.BigInteger;
-import java.security.SecureRandom;
-
-/**
- * GOST R 34.10-2001 Signature Algorithm
- */
-public class ECGOST3410Signer
- implements DSA
-{
- ECKeyParameters key;
-
- SecureRandom random;
-
- public void init(
- boolean forSigning,
- CipherParameters param)
- {
- if (forSigning)
- {
- if (param instanceof ParametersWithRandom)
- {
- ParametersWithRandom rParam = (ParametersWithRandom)param;
-
- this.random = rParam.getRandom();
- this.key = (ECPrivateKeyParameters)rParam.getParameters();
- }
- else
- {
- this.random = new SecureRandom();
- this.key = (ECPrivateKeyParameters)param;
- }
- }
- else
- {
- this.key = (ECPublicKeyParameters)param;
- }
- }
-
- /**
- * generate a signature for the given message using the key we were
- * initialised with. For conventional GOST3410 the message should be a GOST3411
- * hash of the message of interest.
- *
- * @param message the message that will be verified later.
- */
- public BigInteger[] generateSignature(
- byte[] message)
- {
- byte[] mRev = new byte[message.length]; // conversion is little-endian
- for (int i = 0; i != mRev.length; i++)
- {
- mRev[i] = message[mRev.length - 1 - i];
- }
-
- BigInteger e = new BigInteger(1, mRev);
-
- ECDomainParameters ec = key.getParameters();
- BigInteger n = ec.getN();
- BigInteger d = ((ECPrivateKeyParameters)key).getD();
-
- BigInteger r, s;
-
- ECMultiplier basePointMultiplier = new FixedPointCombMultiplier();
-
- do // generate s
- {
- BigInteger k;
- do // generate r
- {
- do
- {
- k = new BigInteger(n.bitLength(), random);
- }
- while (k.equals(ECConstants.ZERO));
-
- ECPoint p = basePointMultiplier.multiply(ec.getG(), k).normalize();
-
- r = p.getAffineXCoord().toBigInteger().mod(n);
- }
- while (r.equals(ECConstants.ZERO));
-
- s = (k.multiply(e)).add(d.multiply(r)).mod(n);
- }
- while (s.equals(ECConstants.ZERO));
-
- return new BigInteger[]{ r, s };
- }
-
- /**
- * return true if the value r and s represent a GOST3410 signature for
- * the passed in message (for standard GOST3410 the message should be
- * a GOST3411 hash of the real message to be verified).
- */
- public boolean verifySignature(
- byte[] message,
- BigInteger r,
- BigInteger s)
- {
- byte[] mRev = new byte[message.length]; // conversion is little-endian
- for (int i = 0; i != mRev.length; i++)
- {
- mRev[i] = message[mRev.length - 1 - i];
- }
-
- BigInteger e = new BigInteger(1, mRev);
- BigInteger n = key.getParameters().getN();
-
- // r in the range [1,n-1]
- if (r.compareTo(ECConstants.ONE) < 0 || r.compareTo(n) >= 0)
- {
- return false;
- }
-
- // s in the range [1,n-1]
- if (s.compareTo(ECConstants.ONE) < 0 || s.compareTo(n) >= 0)
- {
- return false;
- }
-
- BigInteger v = e.modInverse(n);
-
- BigInteger z1 = s.multiply(v).mod(n);
- BigInteger z2 = (n.subtract(r)).multiply(v).mod(n);
-
- ECPoint G = key.getParameters().getG(); // P
- ECPoint Q = ((ECPublicKeyParameters)key).getQ();
-
- ECPoint point = ECAlgorithms.sumOfTwoMultiplies(G, z1, Q, z2).normalize();
-
- // components must be bogus.
- if (point.isInfinity())
- {
- return false;
- }
-
- BigInteger R = point.getAffineXCoord().toBigInteger().mod(n);
-
- return R.equals(r);
- }
-}
+package org.bouncycastle.crypto.signers; + +import org.bouncycastle.crypto.CipherParameters; +import org.bouncycastle.crypto.DSA; +import org.bouncycastle.crypto.params.ECDomainParameters; +import org.bouncycastle.crypto.params.ECKeyParameters; +import org.bouncycastle.crypto.params.ECPrivateKeyParameters; +import org.bouncycastle.crypto.params.ECPublicKeyParameters; +import org.bouncycastle.crypto.params.ParametersWithRandom; +import org.bouncycastle.math.ec.ECAlgorithms; +import org.bouncycastle.math.ec.ECConstants; +import org.bouncycastle.math.ec.ECMultiplier; +import org.bouncycastle.math.ec.ECPoint; +import org.bouncycastle.math.ec.FixedPointCombMultiplier; + +import java.math.BigInteger; +import java.security.SecureRandom; + +/** + * GOST R 34.10-2001 Signature Algorithm + */ +public class ECGOST3410Signer + implements DSA +{ + ECKeyParameters key; + + SecureRandom random; + + public void init( + boolean forSigning, + CipherParameters param) + { + if (forSigning) + { + if (param instanceof ParametersWithRandom) + { + ParametersWithRandom rParam = (ParametersWithRandom)param; + + this.random = rParam.getRandom(); + this.key = (ECPrivateKeyParameters)rParam.getParameters(); + } + else + { + this.random = new SecureRandom(); + this.key = (ECPrivateKeyParameters)param; + } + } + else + { + this.key = (ECPublicKeyParameters)param; + } + } + + /** + * generate a signature for the given message using the key we were + * initialised with. For conventional GOST3410 the message should be a GOST3411 + * hash of the message of interest. + * + * @param message the message that will be verified later. + */ + public BigInteger[] generateSignature( + byte[] message) + { + byte[] mRev = new byte[message.length]; // conversion is little-endian + for (int i = 0; i != mRev.length; i++) + { + mRev[i] = message[mRev.length - 1 - i]; + } + + BigInteger e = new BigInteger(1, mRev); + + ECDomainParameters ec = key.getParameters(); + BigInteger n = ec.getN(); + BigInteger d = ((ECPrivateKeyParameters)key).getD(); + + BigInteger r, s; + + ECMultiplier basePointMultiplier = new FixedPointCombMultiplier(); + + do // generate s + { + BigInteger k; + do // generate r + { + do + { + k = new BigInteger(n.bitLength(), random); + } + while (k.equals(ECConstants.ZERO)); + + ECPoint p = basePointMultiplier.multiply(ec.getG(), k).normalize(); + + r = p.getAffineXCoord().toBigInteger().mod(n); + } + while (r.equals(ECConstants.ZERO)); + + s = (k.multiply(e)).add(d.multiply(r)).mod(n); + } + while (s.equals(ECConstants.ZERO)); + + return new BigInteger[]{ r, s }; + } + + /** + * return true if the value r and s represent a GOST3410 signature for + * the passed in message (for standard GOST3410 the message should be + * a GOST3411 hash of the real message to be verified). + */ + public boolean verifySignature( + byte[] message, + BigInteger r, + BigInteger s) + { + byte[] mRev = new byte[message.length]; // conversion is little-endian + for (int i = 0; i != mRev.length; i++) + { + mRev[i] = message[mRev.length - 1 - i]; + } + + BigInteger e = new BigInteger(1, mRev); + BigInteger n = key.getParameters().getN(); + + // r in the range [1,n-1] + if (r.compareTo(ECConstants.ONE) < 0 || r.compareTo(n) >= 0) + { + return false; + } + + // s in the range [1,n-1] + if (s.compareTo(ECConstants.ONE) < 0 || s.compareTo(n) >= 0) + { + return false; + } + + BigInteger v = e.modInverse(n); + + BigInteger z1 = s.multiply(v).mod(n); + BigInteger z2 = (n.subtract(r)).multiply(v).mod(n); + + ECPoint G = key.getParameters().getG(); // P + ECPoint Q = ((ECPublicKeyParameters)key).getQ(); + + ECPoint point = ECAlgorithms.sumOfTwoMultiplies(G, z1, Q, z2).normalize(); + + // components must be bogus. + if (point.isInfinity()) + { + return false; + } + + BigInteger R = point.getAffineXCoord().toBigInteger().mod(n); + + return R.equals(r); + } +} |