ISO/IEC 10118的这一部分规定了两个使用模运算的哈希函数。这些散列函数， 它被认为是抗冲突的，可以将任意长度但有限的消息压缩为哈希代码 其长度由7.3中定义的约化函数中使用的素数的长度决定。因此 哈希码很容易扩展到任何机制（例如签名算法、身份验证）的输入长度 方案）。 ISO/IEC 10118本部分中规定的哈希函数，称为MASH-1和MASH-2（模运算） 安全散列（Secure Hash）特别适用于模块化算法实现足够安全的环境 长度已经可用。这两个散列函数只在整数中使用的指数上有所不同- 作用

This part of ISO/IEC 10118 specifies two hash-functions which make use of modular arithmetic. These hash-functions, which are believed to be collision-resistant, compress messages of arbitrary but limited length to a hash-code whose length is determined by the length of the prime number used in the reduction-function defined in 7.3. Thus, the hash-code is easily scaled to the input length of any mechanism (e.g., signature algorithm, identification scheme). The hash-functions specified in this part of ISO/IEC 10118, known as MASH-1 and MASH-2 (Modular Arithmetic Secure Hash) are particularly suitable for environments in which implementations of modular arithmetic of sufficient length are already available. The two hash-functions differ only in the exponent used in the round-function.