Package net.i2p.crypto

Core cryptographic primitives and algorithms used throughout I2P.

See: Description

Interface Summary

Interface	Description
EntropyHarvester	Allow various components with some entropy to feed that entropy back into some PRNG.
KeyFactory	Factory interface for generating I2P cryptographic key pairs.
KeyRing	A backend for storing and retrieving SigningPublicKeys to be used for verifying signatures.
TagSetHandle	An opaque handle to a TagSet returned by the SessionKeyManager, so that OCMOSJ can report that the tags were later acked, or not.

Class Summary

Class	Description
AESEngine	Abstract base class for AES cipher operations in I2P.
Blinding	Utilities for Blinding EdDSA keys.
CertUtil	Java X.509 certificate utilities, consolidated from various places.
ChaCha20	ChaCha20, wrapper around Noise ChaChaCore.
CryptixAESEngine	AES encryption engine using Cryptix's Rijndael implementation with CBC mode.
CryptixAESKeyCache	Cache the objects used in CryptixRijndael_Algorithm.makeKey to reduce memory churn.
CryptixRijndael_Algorithm	Rijndael AES algorithm implementation.
CryptoCheck	Moved from CryptixAESEngine and net.i2p.router.tasks.CryptoChecker.
CryptoConstants	Prime for ElGamal from http://tools.ietf.org/html/rfc3526 Primes for DSA: Generated by TheCrypto http://article.gmane.org/gmane.comp.security.invisiblenet.iip.devel/343 See also: ECConstants, RSAConstants
DirKeyRing	Simple storage of each cert in a separate file in a directory.
DSAEngine	Digital signature algorithm engine supporting DSA, ECDSA, RSA, and EdDSA.
ECConstants	Constants for elliptic curves, from NIST FIPS 186-4 (2013) / ANSI X9.62
ECUtil	Elliptic curve utility functions for cryptographic operations.
Hash384	SHA-384 secure hash algorithm implementation.
Hash512	SHA-512 secure hash algorithm implementation.
HKDF	HMAC-based Key Derivation Function (HKDF) implementation using HMAC-SHA256.
HMAC256Generator	HMAC-SHA256 message authentication code generator for I2P cryptographic operations.
HMAC256Generator.HMACKey	Performance-optimized SecretKey implementation for HMAC operations.
HMACGenerator	Abstract base class for HMAC (Hash-based Message Authentication Code) operations.
KeyGenerator	Comprehensive key generation facility for I2P cryptographic operations.
KeyPair	A pair of I2P cryptographic keys consisting of a public key and corresponding private key.
KeyStoreUtil	Keystore utilities, consolidated from various places.
RSAConstants	Constants for RSA
RSASigningPrivateCrtKey	A SigningPrivateKey that retains the Chinese Remainder Theorem parameters, so it can be converted back to a Java CRT key.
SelfSignedGenerator	Generate keys and a selfsigned certificate, suitable for storing in a Keystore with KeyStoreUtil.storePrivateKey().
SessionKeyManager	Manage the session keys and session tags used for encryption and decryption.
SHA1	Implementation of the SHA-1 secure hash algorithm as specified in FIPS PUB 180-2.
SHA1Hash	I2P data structure for SHA-1 hash values.
SHA256Generator	Defines a wrapper for SHA-256 operation.
SigContext.SigContextSpec	Algorithm parameter specification for personalized hash contexts in digital signatures.
SigUtil	Comprehensive utility class for I2P signing keys and digital signatures.
SipHashInline	SipHash implementation with hand inlining the SIPROUND.
SU3File	I2P update file format handler for .su3 files.
TrustedUpdate	Handles signing and verification of I2P update files.
YKGenerator	Precalculate the Y and K for ElGamal encryption operations.

Enum Summary

Enum	Description
EncAlgo	Base encryption algorithm type
EncType	Defines the properties for various encryption types that I2P supports or may someday support.
SigAlgo	Base signature algorithm type
SigContext	Defines the context for signing with personalized hashes.
SigType	Defines the properties for various signature types that I2P supports or may someday support.

Package net.i2p.crypto Description

Core cryptographic primitives and algorithms used throughout I2P.

This package provides the fundamental cryptographic building blocks for I2P's security and privacy features, including:

• Asymmetric Encryption: ElGamal, ECIES, and post-quantum algorithms
• Digital Signatures: DSA, EdDSA, and related signature schemes
• Symmetric Encryption: AES and other block ciphers
• Hash Functions: SHA-256, SHA-3, and cryptographic digests
• Key Derivation: HKDF and other key derivation functions
• Random Number Generation: Cryptographically secure RNG
• Mathematical Primitives: Big integer operations and field arithmetic

All cryptographic operations are designed to provide strong security guarantees while maintaining performance suitable for high-throughput routing operations. The implementation follows established cryptographic standards and best practices.

Note: This package contains low-level cryptographic primitives. For higher-level I2P-specific cryptographic operations, see the net.i2p.crypto.eddsa and net.i2p.crypto.x25519 packages.