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A simple SHA256 hashing example, written in Python using hashlib
#!/bin/bash
# Generates ten data files, each 300 MB in size and filled with random data.
[[ ! -d "data/" ]] && mkdir "data/"
for i in {1..10}; do
dd if="/dev/random" of="data/file${i}" bs=1m count=300
done
#!/usr/bin/env python
import hashlib
import sys
def sha256_checksum(filename, block_size=65536):
sha256 = hashlib.sha256()
with open(filename, 'rb') as f:
for block in iter(lambda: f.read(block_size), b''):
sha256.update(block)
return sha256.hexdigest()
def main():
for f in sys.argv[1:]:
checksum = sha256_checksum(f)
print(f + '\t' + checksum)
if __name__ == '__main__':
main()
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