SHA加密算法,安全哈希算法（Secure Hash Algorithm）主要适用于数字签名标准（Digital Signature Standard DSS）里面定义的数字签名算法（Digital Signature Algorithm DSA）。-SHA encryption algorithm, Secure Hash Algorithm (Secure Hash Algorithm) is mainly applied to Digital Signature Standard (Digital Signature Standard DSS) which defines the Digital Signature Algorithm (Digital Signature Algorithm DSA).