public static byte[] Sign_v15(RSA rsa, HashAlgorithm hash, byte[] hashValue) { int num = rsa.KeySize >> 3; byte[] m = PKCS1.OS2IP(PKCS1.Encode_v15(hash, hashValue, num)); return(PKCS1.I2OSP(PKCS1.RSASP1(rsa, m), num)); }