Why is the maximum message size of the SHA-1 hash function (2^64) - 1 bits?

StackOverflow https://stackoverflow.com/questions/20215646

Question

The title of the question describes everything.
As described on http://en.wikipedia.org/wiki/SHA-1#Comparison_of_SHA_functions
Why is the maximum message size for the SHA-1 hash function limited to (2^64) - 1 bits?

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Solution

Since in hash finalization the unsigned 64-bit message length is appended to the last block and hashed.

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