Method: OpenSSL.secure_compare

Defined in:

lib/openssl.rb

.secure_compare(a, b) ⇒ Object

:call-seq:

OpenSSL.secure_compare(string, string) -> true or false

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.

# File '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