OAEPEncoding class

RSAES-OAEP v2.0

This implementation is based on the RSAES-OAEP (RSA Encryption Scheme - Optimal Asymmetric Encryption Padding) as specified in section 7.1 of RFC 2437 PKCS #1: RSA Cryptography Specifications Version 2.0.

Important: this is not compatible with RSAES-OAEP v2.1 or later (as specified in RFC 3447, RFC 8017, etc.) Those newer versions have an extra 0x00 byte at the beginning of the encoded message (EM) that is passed to the RSA encryption primitive. Therefore, this implementation is incompatible with it, since this is an implementation of v2.0 which does not have that 0x00 byte. A breaking change in the standard!

Currently, this implementation has the following restrictions:

• the hash function is hard-coded to be SHA-1 or SHA-256;
• the mask generation function is hard-coded to MGF1; and
• it cannot accept any encoding parameters (that is, P is always empty)

Implemented types

• AsymmetricBlockCipher

Constructors

OAEPEncoding(AsymmetricBlockCipher engine, [Uint8List? encodingParams])

factory

OAEPEncoding.withCustomDigest(DigestFactory digestFactory, AsymmetricBlockCipher engine, [Uint8List? encodingParams])

factory

OAEPEncoding.withSHA1(AsymmetricBlockCipher engine, [Uint8List? encodingParams])

factory

OAEPEncoding.withSHA256(AsymmetricBlockCipher engine, [Uint8List? encodingParams])

factory

Properties

algorithmName → String

Get this algorithm's standard name.

no setter, override

defHash ↔ Uint8List

Default hash of the encoding parameters, all zero octets

getter/setter pair

encodingParams ↔ Uint8List?

The encoding params, or P, as specified in RFC 2437

getter/setter pair

hash ↔ Digest

Hash function used by the EME-OAEP (Encoding Method for Encryption OAEP).

getter/setter pair

hashCode → int

The hash code for this object.

no setter, inherited

inputBlockSize → int

Get this ciphers's maximum input block size.

no setter, override

mgf1Hash ↔ Digest

Hash function used by the MGF1 Mask Generation Function.

getter/setter pair

outputBlockSize → int

Get this ciphers's maximum output block size.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

init(bool forEncryption, CipherParameters params) → void

Init the cipher with its initialization params. The type of CipherParameters depends on the algorithm being used (see the documentation of each implementation to find out more).

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

process(Uint8List data) → Uint8List

Process a whole block of data at once, returning the result in a byte array.

inherited

processBlock(Uint8List inp, int inpOff, int len, Uint8List out, int outOff) → int

Process a block of len bytes given by inp and starting at offset inpOff and put the resulting cipher text in out beginning at position outOff.

override

reset() → void

Reset the cipher to its original state.

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Properties

factoryConfig → FactoryConfig

Intended for internal use.

final