Assertion: Use assertions to check relationships between fields — for example, the purchase order's total is the sum of the order lines.
断言:使用断言检查字段之间的关系,比如订单中的总量是各行之和。
Message Digests are secure, one-way hash functions that convert arbitrary length data into fixed-length check sum / hash code.
消息摘要是一个安全的、单向的哈希函数,把任意长度的数据转化成固定长度的校验和/哈希码。
For a message digest, the strength of the algorithm is determined by the size of the hash or check sum that the algorithm generates.
对于消息摘要,算法的长度由算法生成的哈希码或者校验和决定。
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