数字签名：产生RSA密钥对(myKeyPair)，得到RSA密钥对，产生Signature对象,对用私钥对信息(info)签名，用指定算法产生签名对象，用私钥初始化签名对象，将待签名的数据传送给签名对象(须在初始化之后)，用公钥验证签名结果，使用公钥初始化签名对象,用于验证签名。-Digital signature: generate RSA keys (myKeyPair), RSA key pair to produce the Signature object information (info) signed with the private key, a signature object with the specified algorithm, initialization signature object with the private key, data transfer to be signed signature object to be initialized after the result with the public key to verify the signature using the public key to initialize the signature object is used to verify the signature.