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Merge pull request #104 from cryptimeleon/develop
Merge into main for Release 4.0.0
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10 changes: 10 additions & 0 deletions
10
src/main/java/org/cryptimeleon/craco/commitment/CommitmentKey.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| package org.cryptimeleon.craco.commitment; | ||
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| import org.cryptimeleon.math.hash.UniqueByteRepresentable; | ||
| import org.cryptimeleon.math.serialization.Representable; | ||
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| /** | ||
| * Commitment key used to commit to messages | ||
| */ | ||
| public interface CommitmentKey extends Representable, UniqueByteRepresentable { | ||
| } |
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43 changes: 43 additions & 0 deletions
43
src/main/java/org/cryptimeleon/craco/sig/ecdsa/ECDSASignature.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,43 @@ | ||
| package org.cryptimeleon.craco.sig.ecdsa; | ||
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| import org.cryptimeleon.craco.sig.Signature; | ||
| import org.cryptimeleon.math.serialization.ByteArrayRepresentation; | ||
| import org.cryptimeleon.math.serialization.Representation; | ||
| import org.cryptimeleon.math.serialization.StandaloneRepresentable; | ||
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| import java.util.Arrays; | ||
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| /** | ||
| * Class for a signature of the {@link ECDSASignatureScheme}. | ||
| */ | ||
| public class ECDSASignature implements Signature, StandaloneRepresentable { | ||
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| final byte[] bytes; | ||
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| public ECDSASignature(byte[] signatureBytes) { | ||
| this.bytes = signatureBytes; | ||
| } | ||
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| public ECDSASignature(Representation repr) { | ||
| this.bytes = ((ByteArrayRepresentation) repr).get(); | ||
| } | ||
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| @Override | ||
| public Representation getRepresentation() { | ||
| return new ByteArrayRepresentation(bytes); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) return true; | ||
| if (o == null || getClass() != o.getClass()) return false; | ||
| ECDSASignature that = (ECDSASignature) o; | ||
| return Arrays.equals(bytes, that.bytes); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Arrays.hashCode(bytes); | ||
| } | ||
| } |
143 changes: 143 additions & 0 deletions
143
src/main/java/org/cryptimeleon/craco/sig/ecdsa/ECDSASignatureScheme.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,143 @@ | ||
| package org.cryptimeleon.craco.sig.ecdsa; | ||
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| import org.cryptimeleon.craco.common.ByteArrayImplementation; | ||
| import org.cryptimeleon.craco.common.plaintexts.MessageBlock; | ||
| import org.cryptimeleon.craco.common.plaintexts.PlainText; | ||
| import org.cryptimeleon.craco.sig.SignatureKeyPair; | ||
| import org.cryptimeleon.craco.sig.SignatureScheme; | ||
| import org.cryptimeleon.craco.sig.SigningKey; | ||
| import org.cryptimeleon.craco.sig.VerificationKey; | ||
| import org.cryptimeleon.math.serialization.Representation; | ||
| import org.cryptimeleon.math.serialization.StringRepresentation; | ||
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| import java.security.*; | ||
| import java.security.spec.ECGenParameterSpec; | ||
| import java.util.Objects; | ||
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| /** | ||
| * Cryptimeleon wrapper for the ECDSA signature scheme. | ||
| * Uses the curve and algorithms specified in the constants below. | ||
| */ | ||
| public class ECDSASignatureScheme implements SignatureScheme { | ||
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| static final String ALGORITHM = "EC"; | ||
| static final String CURVE = "secp256k1"; | ||
| private static final String SIGNING_ALGORITHM = "SHA256withECDSA"; | ||
| private final Signature signer; | ||
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| public ECDSASignatureScheme() { | ||
| try { | ||
| signer = Signature.getInstance(SIGNING_ALGORITHM); | ||
| } catch (NoSuchAlgorithmException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| public SignatureKeyPair<ECDSAVerificationKey, ECDSASigningKey> generateKeyPair() { | ||
| try { | ||
| ECGenParameterSpec ecSpec = new ECGenParameterSpec(CURVE); | ||
| KeyPairGenerator keyGen = KeyPairGenerator.getInstance(ALGORITHM); | ||
| keyGen.initialize(ecSpec); | ||
| KeyPair keyPair = keyGen.generateKeyPair(); | ||
| return new SignatureKeyPair<>(new ECDSAVerificationKey(keyPair.getPublic()), new ECDSASigningKey(keyPair.getPrivate())); | ||
| } catch (NoSuchAlgorithmException | InvalidAlgorithmParameterException e) { | ||
| e.printStackTrace(); | ||
| throw new RuntimeException(e); | ||
| } | ||
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| } | ||
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| @Override | ||
| public org.cryptimeleon.craco.sig.Signature sign(PlainText plainText, SigningKey secretKey) { | ||
| ECDSASigningKey ecdsaSigningKey = (ECDSASigningKey) secretKey; | ||
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| try { | ||
| signer.initSign(ecdsaSigningKey.getKey()); | ||
| signer.update(plainText.getUniqueByteRepresentation()); | ||
| return new ECDSASignature(signer.sign()); | ||
| } catch (InvalidKeyException e ) { | ||
| e.printStackTrace(); | ||
| throw new IllegalArgumentException("Input secretKey must a valid " + ALGORITHM + " secret key"); | ||
| } catch (SignatureException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| @Override | ||
| public Boolean verify(PlainText plainText, org.cryptimeleon.craco.sig.Signature signature, VerificationKey publicKey) { | ||
| ECDSAVerificationKey ecdsaVerificationKey = (ECDSAVerificationKey) publicKey; | ||
| ECDSASignature ecdsaSignature = (ECDSASignature) signature; | ||
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| try { | ||
| signer.initVerify(ecdsaVerificationKey.getKey()); | ||
| signer.update(plainText.getUniqueByteRepresentation()); | ||
| return signer.verify(ecdsaSignature.bytes); | ||
| } catch (InvalidKeyException e ) { | ||
| e.printStackTrace(); | ||
| throw new IllegalArgumentException("Input publicKey must a valid " + ALGORITHM + " public key"); | ||
| } catch (SignatureException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| @Override | ||
| public PlainText restorePlainText(Representation repr) { | ||
| return new MessageBlock(repr, ByteArrayImplementation::new); | ||
| } | ||
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| @Override | ||
| public org.cryptimeleon.craco.sig.Signature restoreSignature(Representation repr) { | ||
| return new ECDSASignature(repr); | ||
| } | ||
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| @Override | ||
| public SigningKey restoreSigningKey(Representation repr) { | ||
| return new ECDSASigningKey(repr); | ||
| } | ||
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| @Override | ||
| public VerificationKey restoreVerificationKey(Representation repr) { | ||
| return new ECDSAVerificationKey(repr); | ||
| } | ||
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| @Override | ||
| public PlainText mapToPlaintext(byte[] bytes, VerificationKey pk) { | ||
| return new ByteArrayImplementation(bytes); | ||
| } | ||
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| @Override | ||
| public PlainText mapToPlaintext(byte[] bytes, SigningKey sk) { | ||
| return new ByteArrayImplementation(bytes); | ||
| } | ||
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| @Override | ||
| public int getMaxNumberOfBytesForMapToPlaintext() { | ||
| return Integer.MAX_VALUE; | ||
| } | ||
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| @Override | ||
| public Representation getRepresentation() { | ||
| return new StringRepresentation(""); | ||
| } | ||
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| /* | ||
| * We need equals, hashcode and the Representation constructor to satisfy the SignatureScheme bounds for automated tests | ||
| * All instances of ECDSASignatureSchemer are 'equal'. | ||
| */ | ||
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| public ECDSASignatureScheme(Representation repr) { | ||
| this(); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| return o != null && getClass() == o.getClass(); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(19817349853L); | ||
| } | ||
| } |
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