Digest Checksums

Digest can turn text into a repeatable checksum for comparisons and examples.

digest_checksums.rb

require "digest"

message = 
checksum = Digest::SHA256.hexdigest(message)
short_checksum = checksum[0, 12]

same_again = Digest::SHA256.hexdigest(message)[0, 12]
matches = short_checksum == same_again

puts "message=#{message}"
puts "checksum=#{short_checksum}"
puts "matches=#{matches}"

require "digest"

message = 
checksum = Digest::SHA256.hexdigest(message)
short_checksum = checksum[0, 12]

same_again = Digest::SHA256.hexdigest(message)[0, 12]
matches = short_checksum == same_again

puts "message=#{message}"
puts "checksum=#{short_checksum}"
puts "matches=#{matches}"

require "digest"

message = 
checksum = Digest::SHA256.hexdigest(message)
short_checksum = checksum[0, 12]

same_again = Digest::SHA256.hexdigest(message)[0, 12]
matches = short_checksum == same_again

puts "message=#{message}"
puts "checksum=#{short_checksum}"
puts "matches=#{matches}"

checksum A digest checksum is deterministic: the same input text produces the same output text.