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Class: OpenSSL::Netscape::SPKI

Relationships & Source Files
Inherits: Object
Defined in: ext/openssl/ossl_ns_spki.c,
ext/openssl/ossl_ns_spki.c

Overview

A Simple Public Key Infrastructure implementation (pronounced “spooky”). The structure is defined as

PublicKeyAndChallenge ::= SEQUENCE {
  spki SubjectPublicKeyInfo,
  challenge IA5STRING
}

SignedPublicKeyAndChallenge ::= SEQUENCE {
  publicKeyAndChallenge PublicKeyAndChallenge,
  signatureAlgorithm AlgorithmIdentifier,
  signature BIT STRING
}

where the definitions of SubjectPublicKeyInfo and AlgorithmIdentifier can be found in RFC5280. SPKI is typically used in browsers for generating a public/private key pair and a subsequent certificate request, using the HTML <keygen> element.

Examples

Creating an SPKI

key = OpenSSL::PKey::RSA.new 2048
spki = OpenSSL::Netscape::SPKI.new
spki.challenge = "RandomChallenge"
spki.public_key = key.public_key
spki.sign(key, OpenSSL::Digest::SHA256.new)
#send a request containing this to a server generating a certificate

Verifying an SPKI request

request = #...
spki = OpenSSL::Netscape::SPKI.new request
unless spki.verify(spki.public_key)
  # signature is invalid
end
#proceed

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new([request]) ⇒ SPKI

Parameters

  • request - optional raw request, either in PEM or DER format.

Instance Attribute Details

#challenge ⇒ String (rw)

Returns the challenge string associated with this SPKI.

#challenge=(str) ⇒ String (rw)

Parameters

  • str - the challenge string to be set for this instance

Sets the challenge to be associated with the SPKI. May be used by the server, e.g. to prevent replay.

#public_key ⇒ pkey (rw)

Returns the public key associated with the SPKI, an instance of ::OpenSSL::PKey.

#public_key=(pub) ⇒ pkey (rw)

Parameters

  • pub - the public key to be set for this instance

Sets the public key to be associated with the SPKI, an instance of ::OpenSSL::PKey. This should be the public key corresponding to the private key used for signing the SPKI.

Instance Method Details

#sign(key, digest) ⇒ SPKI

Parameters

  • key - the private key to be used for signing this instance

  • digest - the digest to be used for signing this instance

To sign an SPKI, the private key corresponding to the public key set for this instance should be used, in addition to a digest algorithm in the form of an ::OpenSSL::Digest. The private key should be an instance of ::OpenSSL::PKey.

#to_der ⇒ DER-encoded string

Returns the DER encoding of this SPKI.

#to_s ⇒ PEM-encoded string #to_pem ⇒ PEM-encoded string

Alias for #to_s.

#to_s ⇒ PEM-encoded string Also known as: #to_pem

Returns the PEM encoding of this SPKI.

#to_text ⇒ String

Returns a textual representation of this SPKI, useful for debugging purposes.

#verify(key) ⇒ Boolean

Parameters

  • key - the public key to be used for verifying the SPKI signature

Returns true if the signature is valid, false otherwise. To verify an SPKI, the public key contained within the SPKI should be used.