A pure Java implementation of a Threshold Encryption scheme.
This particular threshold encryption is a way of encoding the data by a party, such that it can be decrypted only by multiple participants collaborating.
T out of N participants need to be part of the threshold decryption scheme to be able to retrieve the plaintext.
Part of Weavechain: The Layer-0 For Data
implementation 'com.weavechain:threshold-encrypt:1.0.1'
implementation("com.weavechain:threshold-encrypt:1.0.1")
<dependency>
<groupId>com.weavechain</groupId>
<artifactId>threshold-encrypt</artifactId>
<version>1.0.1</version>
</dependency>Number encryption
int T = 3;
int N = 5;
ThresholdEncSecp tsig = new ThresholdEncSecp(T, N);
ThresholdEncSecpParams params = tsig.generate(null);
List<byte[]> partialShares = params.getPrivateShares().subList(0, 3);
Set<Integer> nodes = Set.of(0, 1, 2);
boolean check = ThresholdEncSecp.verify(partialShares.get(0), 1, params.getPublicShares());
System.out.println(check ? "Success" : "Fail");
BigInteger value = new BigInteger("1234567890");
byte[] enc = ThresholdEncSecp.encrypt(params.getPublicKey(), value);
byte[] privateKey = tsig.reconstruct(partialShares, nodes);
BigInteger decoded = ThresholdEncSecp.decrypt(privateKey, enc);
boolean match = Objects.equals(decoded, value);
System.out.println(match ? "Success" : "Fail");Message encryption
int T = 3;
int N = 5;
ThresholdEncSecp tsig = new ThresholdEncSecp(T, N);
ThresholdEncSecpParams params = tsig.generate(null);
List<byte[]> partialShares = params.getPrivateShares().subList(0, 2);
partialShares.add(params.getPrivateShares().get(4));
Set<Integer> nodes = Set.of(0, 1, 4);
boolean check = ThresholdEncSecp.verify(partialShares.get(0), 1, params.getPublicShares());
System.out.println(check ? "Success" : "Fail");
String value = "test message to be decrypted by t out of n recipients";
byte[] enc = ThresholdEncSecp.encrypt(params.getPublicKey(), value);
byte[] privateKey = tsig.reconstruct(partialShares, nodes);
String decoded = ThresholdEncSecp.decryptString(privateKey, enc);
boolean match = Objects.equals(decoded, value);
System.out.println(match ? "Success" : "Fail");Read more about Weavechain at https://docs.weavechain.com
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