Class HashFunctions

java.lang.Object

org.episteme.core.mathematics.cryptography.HashFunctions

public class HashFunctions
extends Object

Cryptographic hash functions.

One-way functions for data integrity, digital signatures, password hashing.

Since:

1.0

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Constructor Summary

Constructors

Constructor	Description
HashFunctions()

Method Summary

Modifier and Type	Method	Description
static boolean	constantTimeEquals(byte[] a, byte[] b)	Constant-time comparison to prevent timing attacks.
static byte[]	hmacSha256(byte[] key, byte[] data)	HMAC-SHA256 (keyed hash for message authentication).
static byte[]	pbkdf2(String password, byte[] salt, int iterations)	bcrypt-like password hashing (using PBKDF2).
static byte[]	sha256(byte[] data)	SHA-256 hash function.
static String	sha256(String text)	SHA-256 for strings.
static byte[]	sha512(byte[] data)	SHA-512 hash function.
static String	sha512(String text)	SHA-512 for strings.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HashFunctions

public HashFunctions()

Method Details

sha256

public static byte[] sha256(byte[] data)

SHA-256 hash function.

Produces 256-bit (32-byte) hash. Collision-resistant.

sha256

public static String sha256(String text)

SHA-256 for strings.

sha512

public static byte[] sha512(byte[] data)

SHA-512 hash function.

sha512

public static String sha512(String text)

SHA-512 for strings.

hmacSha256

public static byte[] hmacSha256(byte[] key,
 byte[] data)

HMAC-SHA256 (keyed hash for message authentication).

pbkdf2

public static byte[] pbkdf2(String password,
 byte[] salt,
 int iterations)

bcrypt-like password hashing (using PBKDF2).

Slow by design to resist brute-force attacks.

constantTimeEquals

public static boolean constantTimeEquals(byte[] a,
 byte[] b)

Constant-time comparison to prevent timing attacks.