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# frozen_string_literal: true
module OpenSSL
class HMAC
# Securely compare with another HMAC instance in constant time.
def ==(other)
return false unless HMAC === other
return false unless self.digest.bytesize == other.digest.bytesize
OpenSSL.fixed_length_secure_compare(self.digest, other.digest)
end
class << self
# :call-seq:
# HMAC.digest(digest, key, data) -> aString
#
# Returns the authentication code as a binary string. The _digest_ parameter
# specifies the digest algorithm to use. This may be a String representing
# the algorithm name or an instance of OpenSSL::Digest.
#
# === Example
# key = 'key'
# data = 'The quick brown fox jumps over the lazy dog'
#
# hmac = OpenSSL::HMAC.digest('SHA1', key, data)
# #=> "\xDE|\x9B\x85\xB8\xB7\x8A\xA6\xBC\x8Az6\xF7\n\x90p\x1C\x9D\xB4\xD9"
def digest(digest, key, data)
hmac = new(key, digest)
hmac << data
hmac.digest
end
# :call-seq:
# HMAC.hexdigest(digest, key, data) -> aString
#
# Returns the authentication code as a hex-encoded string. The _digest_
# parameter specifies the digest algorithm to use. This may be a String
# representing the algorithm name or an instance of OpenSSL::Digest.
#
# === Example
# key = 'key'
# data = 'The quick brown fox jumps over the lazy dog'
#
# hmac = OpenSSL::HMAC.hexdigest('SHA1', key, data)
# #=> "de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9"
def hexdigest(digest, key, data)
hmac = new(key, digest)
hmac << data
hmac.hexdigest
end
end
end
end
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