class method
OpenSSL.secure_compare
(::String a, ::String b) -> bool
OpenSSL.secure_compare(string, string) → true or false
ext/openssl/lib/openssl.rb
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# File tmp/rubies/ruby-4.0.0/ext/openssl/lib/openssl.rb, line 36
def self.secure_compare(a, b)
hashed_a = OpenSSL::Digest.digest('SHA256', a)
hashed_b = OpenSSL::Digest.digest('SHA256', b)
OpenSSL.fixed_length_secure_compare(hashed_a, hashed_b) && a == b
end
Constant time memory comparison. Inputs are hashed using SHA-256 to mask the length of the secret. Returns true if the strings are identical, false otherwise.
This method is expensive due to the SHA-256 hashing. In most cases, where the input lengths are known to be equal or are not sensitive, OpenSSL.fixed_length_secure_compare should be used instead.