SubjectPublicKeyInfo class

The "Subject Public Key Info" is defined by ASN.1 as a part of X.509. It consists of an algorithm (identified by an OID with optional parameters) and a bit string.

This is one of the formats that can be used by OpenSSH to store public keys. It is text encoded with the label of "PUBLIC KEY" (i.e. the pre encapsulation boundary is "-----BEGIN PUBLIC KEY-----"). OpenSSH incorrectly and confusingly refers to this format as "PKCS#8". Real PKCS #8 is a format for private keys, not public keys, and does not specify this format. To avoid further confusion, this format will be referred to as the Subject Public Key Info format, or SPKI for short.

This format is used in conjunction with the RFC 7468 textual encoding (sometimes imprecisely referred to as "PEM").

Format

This binary format is defined in RFC 2459 Internet X.509 Public Key Infrastructure Certificate and CRL Profile by this ASN.1 type:

SubjectPublicKeyInfo  ::=  SEQUENCE  {
    algorithm            AlgorithmIdentifier,
    subjectPublicKey     BIT STRING  }

The AlgorithmIdentifier is defined in RFC 5280 Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile by this ASN.1 type:

AlgorithmIdentifier  ::=  SEQUENCE  {
    algorithm               OBJECT IDENTIFIER,
    parameters              ANY DEFINED BY algorithm OPTIONAL  }

The bit string contents of the subjectPublicKey depend on the algorithm used, and are defined in RFC 3279 Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile.

Note: this class decodes from, and encodes to, binary data. That binary data is usually decoded from text, or encoded to text, using RFC 7468 Textual Encoding, which is implemented by TextualEncoding.

Implemented types

• BinaryFormat

Constructors

SubjectPublicKeyInfo(String algorithmOid, List<ASN1Object> algorithmParameters, Uint8List data)

Constructor from values

SubjectPublicKeyInfo.decode(Uint8List bytes, {required PubTextSource? source})

Decode from a sequence of bytes.

Properties

algorithmOid ↔ String

Object Identifier (OID) that identifies the algorithm.

getter/setter pair

algorithmParameters ↔ List<ASN1Object>

Additional parameters for the algorithm.

getter/setter pair

data ↔ Uint8List

Binary data containing the public key

getter/setter pair

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

source → PubTextSource?

Source this was decoded from.

final

Methods

encode() → Uint8List

Encode as a sequence of bytes.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited