class JWT::JWA::Ecdsa
Constants
- NAMED_CURVES
Attributes
digest[R]
Public Class Methods
curve_by_name(name)
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# File lib/jwt/jwa/ecdsa.rb, line 66 def self.curve_by_name(name) NAMED_CURVES.fetch(name) do raise UnsupportedEcdsaCurve, "The ECDSA curve '#{name}' is not supported" end end
from_algorithm(algorithm)
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# File lib/jwt/jwa/ecdsa.rb, line 62 def self.from_algorithm(algorithm) new(algorithm, algorithm.downcase.gsub('es', 'sha')) end
new(alg, digest)
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# File lib/jwt/jwa/ecdsa.rb, line 8 def initialize(alg, digest) @alg = alg @digest = OpenSSL::Digest.new(digest) end
Public Instance Methods
sign(data:, signing_key:)
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# File lib/jwt/jwa/ecdsa.rb, line 13 def sign(data:, signing_key:) curve_definition = curve_by_name(signing_key.group.curve_name) key_algorithm = curve_definition[:algorithm] if alg != key_algorithm raise IncorrectAlgorithm, "payload algorithm is #{alg} but #{key_algorithm} signing key was provided" end asn1_to_raw(signing_key.dsa_sign_asn1(digest.digest(data)), signing_key) end
verify(data:, signature:, verification_key:)
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# File lib/jwt/jwa/ecdsa.rb, line 23 def verify(data:, signature:, verification_key:) curve_definition = curve_by_name(verification_key.group.curve_name) key_algorithm = curve_definition[:algorithm] if alg != key_algorithm raise IncorrectAlgorithm, "payload algorithm is #{alg} but #{key_algorithm} verification key was provided" end verification_key.dsa_verify_asn1(digest.digest(data), raw_to_asn1(signature, verification_key)) rescue OpenSSL::PKey::PKeyError raise JWT::VerificationError, 'Signature verification raised' end
Private Instance Methods
asn1_to_raw(signature, public_key)
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# File lib/jwt/jwa/ecdsa.rb, line 87 def asn1_to_raw(signature, public_key) byte_size = (public_key.group.degree + 7) / 8 OpenSSL::ASN1.decode(signature).value.map { |value| value.value.to_s(2).rjust(byte_size, "\x00") }.join end
curve_by_name(name)
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# File lib/jwt/jwa/ecdsa.rb, line 76 def curve_by_name(name) self.class.curve_by_name(name) end
raw_to_asn1(signature, private_key)
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# File lib/jwt/jwa/ecdsa.rb, line 80 def raw_to_asn1(signature, private_key) byte_size = (private_key.group.degree + 7) / 8 sig_bytes = signature[0..(byte_size - 1)] sig_char = signature[byte_size..-1] || '' OpenSSL::ASN1::Sequence.new([sig_bytes, sig_char].map { |int| OpenSSL::ASN1::Integer.new(OpenSSL::BN.new(int, 2)) }).to_der end