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Introduction
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------------
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# Introduction
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sha is a simple program that hashes files. It uses the National
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Institute of Standards and Technology's Secure Hash Algorithm.
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It can use SHA-1, SHA-256, SHA-384, or SHA-512, which generate
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respectively, hashes of 160, 256, 384, or 512 bits. sha can be
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used in scripts to do, for example, file integrity checking.
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sha is a simple program that hashes files. It uses the National Institute of Standards and Technology's Secure Hash Algorithm. It can use SHA-1, SHA-256, SHA-384, or SHA-512, which generate respectively, hashes of 160, 256, 384, or 512 bits. sha can be used in scripts to do, for example, file integrity checking.
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Using sha is simple. Just pass the names of one or more files on
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the command line.
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Using sha is simple. Just pass the names of one or more files on the command line.
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You may want to perform a sanity check on sha before relying on
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it. A program called "shatest" is built along with sha. If you
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run shatest, it will display the results of running the various
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SHA algorithms on a set of known test vectors. If the resultant
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hash matches what is expected, "PASS" will be displayed. Otherwise
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it will display "FAIL."
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You may want to perform a sanity check on sha before relying on it. A program called "shatest" is built along with sha. If you run shatest, it will display the results of running the various SHA algorithms on a set of known test vectors. If the resultant hash matches what is expected, "PASS" will be displayed. Otherwise it will display "FAIL."
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