文件名称:MD5--delphI
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MD5算法先对输入的数据进行补位，使得数据位长度LEN对512求余的结果是448。即数据扩展至K*512+448位。即K*64+56个字节，K为整数。
具体补位操作：补一个1，然后补0至满足上述要求。
补数据长度：
用一个64位的数字表示数据的原始长度B，把B用两个32位数表示。这时，数-MD5 algorithm input data to be fill the seats, so that the data bit length LEN 512 modulo result is 448. That data is extended to K* 512+ 448 bits. I.e. K* 64+ 56 bytes, K is an integer.
Specific operations fill the seats: make a 1, then fill 0 to meet those requirements.
Complement Data length:
With a 64-bit digital data representing the original length of B, B is represented by the two 32-bit number. In this case, the number of
具体补位操作：补一个1，然后补0至满足上述要求。
补数据长度：
用一个64位的数字表示数据的原始长度B，把B用两个32位数表示。这时，数-MD5 algorithm input data to be fill the seats, so that the data bit length LEN 512 modulo result is 448. That data is extended to K* 512+ 448 bits. I.e. K* 64+ 56 bytes, K is an integer.
Specific operations fill the seats: make a 1, then fill 0 to meet those requirements.
Complement Data length:
With a 64-bit digital data representing the original length of B, B is represented by the two 32-bit number. In this case, the number of
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