Pkcs1RsaPrivateKey class

PKCS #1 version 2.0 representation of an RSA private key.

This class can be used to:

• Decode a sequence of bytes into the parameters for an RSA private key using the decode constructor; or
• Encode the parameters for an RSA private key into a sequence of bytes using the encode method.

This class only exposes the modulus, privateExponent, prime1 and prime2 RSA parameters, even though the binary format includes other parameters.

Format

This binary format is defined in RFC 2437 PKCS #1: RSA Cryptography Specifications, Version 2.0 by this ASN.1 type:

RSAPrivateKey ::= SEQUENCE {
  version Version,
  modulus INTEGER, -- n
  publicExponent INTEGER, -- e
  privateExponent INTEGER, -- d
  prime1 INTEGER, -- p
  prime2 INTEGER, -- q
  exponent1 INTEGER, -- d mod (p-1)
  exponent2 INTEGER, -- d mod (q-1)
  coefficient INTEGER -- (inverse of q) mod p }

Version ::= INTEGER

Where:

• version is the version number, for compatibility with future
• modulus is the modulus n.
• publicExponent is the public exponent e.
• privateExponent is the private exponent d.
• prime1 is the prime factor p of n.
• prime2 is the prime factor q of n.
• exponent1 is d mod (p-1).
• exponent2 is d mod (q-1).
• coefficient is the Chinese Remainder Theorem coefficient q-1 mod p.

This implementation only supports a value of 0 for the version object.

The ASN.1 type is identical in PKCS #1 version 1.5 (RFC 2313).

Version of PKCS #1 newer than version 2.0 are not supported. The ASN.1 type in PKCS #1 version 2.1 (RFC 3447) and PKCS #1 version 2.2 (RFC 8017) are identified by a value of 1 for the version object. The decode constructor will throw an exception if the value of the version object is not 0.

Implemented types

• BinaryFormat

Constructors

Pkcs1RsaPrivateKey(BigInt modulus, BigInt privateExponent, BigInt prime1, BigInt prime2)

Constructor.

Pkcs1RsaPrivateKey.decode(Uint8List data, PvtTextSource? source)

Decode from a sequence of bytes.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

modulus ↔ BigInt

RSA modulus (n)

late, final

prime1 ↔ BigInt

Prime 1 (p)

late, final

prime2 ↔ BigInt

Prime 2 (q)

late, final

privateExponent ↔ BigInt

RSA private exponent (d)

late, final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

source → PvtTextSource?

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