sha1sum
Computer program that calculates and verifies SHA-1 hashes / From Wikipedia, the free encyclopedia
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sha1sum is a computer program that calculates and verifies SHA-1 hashes. It is commonly used to verify the integrity of files. It (or a variant) is installed by default on most Linux distributions. Typically distributed alongside sha1sum
are sha224sum, sha256sum, sha384sum and sha512sum, which use a specific SHA-2 hash function and b2sum,[1] which uses the BLAKE2 cryptographic hash function.
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The SHA-1 variants are proven vulnerable to collision attacks, and users should instead use, for example, a SHA-2 variant such as sha256sum or the BLAKE2 variant b2sum to prevent tampering by an adversary.[2][3]
It is included in GNU Core Utilities,[4] Busybox (excluding b2sum),[5] and Toybox (excluding b2sum).[6] Ports to a wide variety of systems are available, including Microsoft Windows.