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Digital Signature

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About the library

The library contains contains RSA digital signature algorithm

Class RSASignature:

Constructors:

  • RSASignature(BigInteger p, BigInteger q, BigInteger privateexp, CryptoHash hashFunction)
    • p,q - prime number
    • privateexp - private exponent, 1 < p < (p-1)(q-1), gcd(privateexp, (p-1)(q-1)) = 1,
    • hashFunction - The object to get the hash function (Must implement the interface CryptoHash)

Methods:

  • BigInteger sign(byte[] message) - Sign an array of bytes

    • return signature = hash(message)^d mod r

  • static boolean checkSignature(RSAPublicKey key, BigInteger signature, byte[] message, CryptoHash hashFunction) - Verifies signature validity