SHA-1 (Secure Hash Algorithm 1) is a cryptographically broken but widely used hash
function that takes an input and produces a 160-bit (20-byte) hash value known as a
message digest – typically rendered as a hexadecimal number, 40 digits long.
The SHA1 algorithm generates a 160-bits message digest, representing a 40-character
hexadecimal number. For example, “A94A8FE5CCB19BA61C4C0873D391E987982FBBD3” is a SHA1
hash.
SHA-1 works by feeding any input message as a bit string of length less than 2 64 2^{64}
264 bits and producing a 160-bit hash value known as a message digest.
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