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md5 算法源码

	/*
	MD5 ("") = d41d8cd98f00b204e9800998ecf8427e
	MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661
	MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72
	MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0
	MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b
	MD5 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") =
	d174ab98d277d9f5a5611c2c9f419d9f
	MD5 ("123456789012345678901234567890123456789012345678901234567890123456
	78901234567890") = 57edf4a22be3c955ac49da2e2107b67a
	*/