This module implements the interface to NIST's secure hash algorithm, known as SHA-1. SHA-1 is an improved version of the original SHA hash algorithm. It is used in the same way as the md5 module: use new() to create an sha object, then feed this object with arbitrary strings using the update() method, and at any point you can ask it for the digest of the concatenation of the strings fed to it so far. SHA-1 digests are 160 bits instead of MD5's 128 bits.
The following values are provided as constants in the module and as attributes of the sha objects returned by new():
1. This size is used to allow an arbitrary string to be hashed.
An sha object has the same methods as md5 objects:
m.update(a); m.update(b)is equivalent to
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