A class for calculating message digests using the SHA-1 Secure
Hash Algorithm by NIST (the US' National Institute of Standards and Technology), described in FIPS PUB 180-1.
Digest::Instance for digest API.
SHA-1 calculates a digest of 160 bits (20 bytes).
require 'digest' # Compute a complete digest Digest::SHA1.hexdigest 'abc' #=> "a9993e36..." # Compute digest by chunks sha1 = Digest::SHA1.new # =>#<Digest::SHA1> sha1.update "ab" sha1 << "c" # alias for #update sha1.hexdigest # => "a9993e36..." # Use the same object to compute another digest sha1.reset sha1 << "message" sha1.hexdigest # => "6f9b9af3..."