?? sha512digest.java
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package org.bouncycastle.crypto.digests;/** * FIPS 180-2 implementation of SHA-512. * * <pre> * block word digest * SHA-1 512 32 160 * SHA-256 512 32 256 * SHA-384 1024 64 384 * SHA-512 1024 64 512 * </pre> */public class SHA512Digest extends LongDigest{ private static final int DIGEST_LENGTH = 64; /** * Standard constructor */ public SHA512Digest() { } /** * Copy constructor. This will copy the state of the provided * message digest. */ public SHA512Digest(SHA512Digest t) { super(t); } public String getAlgorithmName() { return "SHA-512"; } public int getDigestSize() { return DIGEST_LENGTH; } public int doFinal( byte[] out, int outOff) { finish(); unpackWord(H1, out, outOff); unpackWord(H2, out, outOff + 8); unpackWord(H3, out, outOff + 16); unpackWord(H4, out, outOff + 24); unpackWord(H5, out, outOff + 32); unpackWord(H6, out, outOff + 40); unpackWord(H7, out, outOff + 48); unpackWord(H8, out, outOff + 56); reset(); return DIGEST_LENGTH; } /** * reset the chaining variables */ public void reset() { super.reset(); /* SHA-512 initial hash value * The first 64 bits of the fractional parts of the square roots * of the first eight prime numbers */ H1 = 0x6a09e667f3bcc908L; H2 = 0xbb67ae8584caa73bL; H3 = 0x3c6ef372fe94f82bL; H4 = 0xa54ff53a5f1d36f1L; H5 = 0x510e527fade682d1L; H6 = 0x9b05688c2b3e6c1fL; H7 = 0x1f83d9abfb41bd6bL; H8 = 0x5be0cd19137e2179L; }}?? 快捷鍵說(shuō)明
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