org.bouncycastle.crypto.generators

Class SM9Sm3

java.lang.Object

org.bouncycastle.crypto.generators.SM9Sm3

public class SM9Sm3
extends java.lang.Object

The shared SM3-based auxiliary functions of SM9 (GM/T 0044-2016): the cryptographic functions H1 and H2 that map a byte string to an integer in [1, n-1] (GM/T 0044.2, 5.4), and the key derivation function KDF (GM/T 0044.3/0044.4). H_v is SM3 (256-bit output).

Method Summary

Modifier and Type	Method and Description
static java.math.BigInteger	h1(byte[] z, java.math.BigInteger n) H1(Z, n): hash-to-range with the 0x01 domain prefix (GM/T 0044.2 5.4.2.2).
static java.math.BigInteger	h2(byte[] z, java.math.BigInteger n) H2(Z, n): hash-to-range with the 0x02 domain prefix (GM/T 0044.2 5.4.2.3).
static byte[]	kdf(byte[] z, int klenBits) The SM9 key derivation function KDF(Z, klen) (GM/T 0044.3/0044.4), a counter-mode construction over SM3 with a 32-bit big-endian counter starting at 1.

Methods inherited from class java.lang.Object

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

Method Detail

h1

public static java.math.BigInteger h1(byte[] z,
                                      java.math.BigInteger n)

H1(Z, n): hash-to-range with the 0x01 domain prefix (GM/T 0044.2 5.4.2.2).

h2

public static java.math.BigInteger h2(byte[] z,
                                      java.math.BigInteger n)

H2(Z, n): hash-to-range with the 0x02 domain prefix (GM/T 0044.2 5.4.2.3).

kdf

public static byte[] kdf(byte[] z,
                         int klenBits)

The SM9 key derivation function KDF(Z, klen) (GM/T 0044.3/0044.4), a counter-mode construction over SM3 with a 32-bit big-endian counter starting at 1. klenBits is the requested output length in bits.