本文整理了Java中org.spongycastle.math.ec.ECCurve.decodePoint()方法的一些代码示例，展示了ECCurve.decodePoint()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ECCurve.decodePoint()方法的具体详情如下：
包路径：org.spongycastle.math.ec.ECCurve
类名称：ECCurve
方法名：decodePoint

ECCurve.decodePoint介绍

[英]Decode a point on this curve from its ASN.1 encoding. The different encodings are taken account of, including point compression for Fp (X9.62 s 4.2.1 pg 17).
[中]

代码示例

代码示例来源：origin: ethereum/ethereumj

static AuthResponseMessage decode(byte[] wire) {
  int offset = 0;
  AuthResponseMessage message = new AuthResponseMessage();
  byte[] bytes = new byte[65];
  System.arraycopy(wire, offset, bytes, 1, 64);
  offset += 64;
  bytes[0] = 0x04; // uncompressed
  message.ephemeralPublicKey = ECKey.CURVE.getCurve().decodePoint(bytes);
  message.nonce = new byte[32];
  System.arraycopy(wire, offset, message.nonce, 0, 32);
  offset += message.nonce.length;
  byte tokenUsed = wire[offset];
  offset += 1;
  if (tokenUsed != 0x00 && tokenUsed != 0x01)
    throw new RuntimeException("invalid boolean"); // TODO specific exception
  message.isTokenUsed = (tokenUsed == 0x01);
  return message;
}

代码示例来源：origin: ethereum/ethereumj

/**
 * Utility for compressing an elliptic curve point. Returns the same point if it's already compressed.
 * See the ECKey class docs for a discussion of point compression.
 *
 * @param uncompressed -
 *
 * @return -
 * @deprecated per-point compression property will be removed in Bouncy Castle
 */
public static ECPoint compressPoint(ECPoint uncompressed) {
  return CURVE.getCurve().decodePoint(uncompressed.getEncoded(true));
}

代码示例来源：origin: ethereum/ethereumj

/**
 * Utility for decompressing an elliptic curve point. Returns the same point if it's already compressed.
 * See the ECKey class docs for a discussion of point compression.
 *
 * @param compressed -
 *
 * @return  -
 * @deprecated per-point compression property will be removed in Bouncy Castle
 */
public static ECPoint decompressPoint(ECPoint compressed) {
  return CURVE.getCurve().decodePoint(compressed.getEncoded(false));
}

代码示例来源：origin: ethereum/ethereumj

/**
 * Creates an ECKey that cannot be used for signing, only verifying signatures, from the given encoded point.
 * The compression state of pub will be preserved.
 *
 * @param pub -
 * @return -
 */
public static ECKey fromPublicOnly(byte[] pub) {
  return new ECKey(null, CURVE.getCurve().decodePoint(pub));
}

代码示例来源：origin: ethereum/ethereumj

public static byte[] decrypt(BigInteger privKey, byte[] cipher, byte[] macData) throws IOException, InvalidCipherTextException {
  byte[] plaintext;
  ByteArrayInputStream is = new ByteArrayInputStream(cipher);
  byte[] ephemBytes = new byte[2*((CURVE.getCurve().getFieldSize()+7)/8) + 1];
  is.read(ephemBytes);
  ECPoint ephem = CURVE.getCurve().decodePoint(ephemBytes);
  byte[] IV = new byte[KEY_SIZE /8];
  is.read(IV);
  byte[] cipherBody = new byte[is.available()];
  is.read(cipherBody);
  plaintext = decrypt(ephem, privKey, IV, cipherBody, macData);
  return plaintext;
}

代码示例来源：origin: ethereum/ethereumj

static AuthInitiateMessage decode(byte[] wire) {
  AuthInitiateMessage message = new AuthInitiateMessage();
  int offset = 0;
  byte[] r = new byte[32];
  byte[] s = new byte[32];
  System.arraycopy(wire, offset, r, 0, 32);
  offset += 32;
  System.arraycopy(wire, offset, s, 0, 32);
  offset += 32;
  int v = wire[offset] + 27;
  offset += 1;
  message.signature = ECKey.ECDSASignature.fromComponents(r, s, (byte)v);
  message.ephemeralPublicHash = new byte[32];
  System.arraycopy(wire, offset, message.ephemeralPublicHash, 0, 32);
  offset += 32;
  byte[] bytes = new byte[65];
  System.arraycopy(wire, offset, bytes, 1, 64);
  offset += 64;
  bytes[0] = 0x04; // uncompressed
  message.publicKey = ECKey.CURVE.getCurve().decodePoint(bytes);
  message.nonce = new byte[32];
  System.arraycopy(wire, offset, message.nonce, 0, 32);
  offset += message.nonce.length;
  byte tokenUsed = wire[offset];
  offset += 1;
  if (tokenUsed != 0x00 && tokenUsed != 0x01)
    throw new RuntimeException("invalid boolean"); // TODO specific exception
  message.isTokenUsed = (tokenUsed == 0x01);
  return message;
}

代码示例来源：origin: ethereum/ethereumj

/**
 * Creates an ECKey that simply trusts the caller to ensure that point is really the result of multiplying the
 * generator point by the private key. This is used to speed things up when you know you have the right values
 * already. The compression state of the point will be preserved.
 *
 * @param priv -
 * @param pub -
 * @return -
 */
public static ECKey fromPrivateAndPrecalculatedPublic(byte[] priv, byte[] pub) {
  check(priv != null, "Private key must not be null");
  check(pub != null, "Public key must not be null");
  return new ECKey(new BigInteger(1, priv), CURVE.getCurve().decodePoint(pub));
}

代码示例来源：origin: ethereum/ethereumj

/**
 * Decompress a compressed public key (x co-ord and low-bit of y-coord).
 *
 * @param xBN -
 * @param yBit -
 * @return -
 */
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
  X9IntegerConverter x9 = new X9IntegerConverter();
  byte[] compEnc = x9.integerToBytes(xBN, 1 + x9.getByteLength(CURVE.getCurve()));
  compEnc[0] = (byte) (yBit ? 0x03 : 0x02);
  return CURVE.getCurve().decodePoint(compEnc);
}

代码示例来源：origin: ethereum/ethereumj

/**
 * <p>Verifies the given ECDSA signature against the message bytes using the public key bytes.</p>
 *
 * <p>When using native ECDSA verification, data must be 32 bytes, and no element may be
 * larger than 520 bytes.</p>
 *
 * @param data Hash of the data to verify.
 * @param signature signature.
 * @param pub The public key bytes to use.
 *
 * @return -
 */
public static boolean verify(byte[] data, ECDSASignature signature, byte[] pub) {
  ECDSASigner signer = new ECDSASigner();
  ECPublicKeyParameters params = new ECPublicKeyParameters(CURVE.getCurve().decodePoint(pub), CURVE);
  signer.init(false, params);
  try {
    return signer.verifySignature(data, signature.r, signature.s);
  } catch (NullPointerException npe) {
    // Bouncy Castle contains a bug that can cause NPEs given specially crafted signatures.
    // Those signatures are inherently invalid/attack sigs so we just fail them here rather than crash the thread.
    logger.error("Caught NPE inside bouncy castle", npe);
    return false;
  }
}

代码示例来源：origin: ethereum/ethereumj

public static byte[] decrypt(BigInteger prv, byte[] cipher) throws InvalidCipherTextException, IOException {
  ByteArrayInputStream is = new ByteArrayInputStream(cipher);
  byte[] ephemBytes = new byte[2*((curve.getCurve().getFieldSize()+7)/8) + 1];
  is.read(ephemBytes);
  ECPoint ephem = curve.getCurve().decodePoint(ephemBytes);
  byte[] IV = new byte[KEY_SIZE /8];
  is.read(IV);
  byte[] cipherBody = new byte[is.available()];
  is.read(cipherBody);
  EthereumIESEngine iesEngine = makeIESEngine(false, ephem, prv, IV);
  byte[] message = iesEngine.processBlock(cipherBody, 0, cipherBody.length);
  return message;
}

代码示例来源：origin: ethereum/ethereumj

static AuthResponseMessageV4 decode(byte[] wire) {
  AuthResponseMessageV4 message = new AuthResponseMessageV4();
  RLPList params = (RLPList) RLP.decode2OneItem(wire, 0);
  byte[] pubKeyBytes = params.get(0).getRLPData();
  byte[] bytes = new byte[65];
  System.arraycopy(pubKeyBytes, 0, bytes, 1, 64);
  bytes[0] = 0x04; // uncompressed
  message.ephemeralPublicKey = ECKey.CURVE.getCurve().decodePoint(bytes);
  message.nonce = params.get(1).getRLPData();
  byte[] versionBytes = params.get(2).getRLPData();
  message.version = ByteUtil.byteArrayToInt(versionBytes);
  return message;
}

代码示例来源：origin: ethereum/ethereumj

static AuthInitiateMessageV4 decode(byte[] wire) {
  AuthInitiateMessageV4 message = new AuthInitiateMessageV4();
  RLPList params = (RLPList) RLP.decode2OneItem(wire, 0);
  byte[] signatureBytes = params.get(0).getRLPData();
  int offset = 0;
  byte[] r = new byte[32];
  byte[] s = new byte[32];
  System.arraycopy(signatureBytes, offset, r, 0, 32);
  offset += 32;
  System.arraycopy(signatureBytes, offset, s, 0, 32);
  offset += 32;
  int v = signatureBytes[offset] + 27;
  message.signature = ECKey.ECDSASignature.fromComponents(r, s, (byte)v);
  byte[] publicKeyBytes = params.get(1).getRLPData();
  byte[] bytes = new byte[65];
  System.arraycopy(publicKeyBytes, 0, bytes, 1, 64);
  bytes[0] = 0x04; // uncompressed
  message.publicKey = ECKey.CURVE.getCurve().decodePoint(bytes);
  message.nonce = params.get(2).getRLPData();
  byte[] versionBytes = params.get(3).getRLPData();
  message.version = ByteUtil.byteArrayToInt(versionBytes);
  return message;
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

public ECPoint get() {
  if (point == null)
    point = curve.decodePoint(bits);
  return point;
}

代码示例来源：origin: com.madgag.spongycastle/bcpg-jdk15on

static ECPoint decodePoint(
    BigInteger encodedPoint,
    ECCurve    curve)
    throws IOException
  {
    return curve.decodePoint(BigIntegers.asUnsignedByteArray(encodedPoint));
  }
}

代码示例来源：origin: com.madgag.spongycastle/bcpg-jdk15on

static ECPoint decodePoint(
  BigInteger encodedPoint,
  ECCurve curve)
  throws IOException
{
  return curve.decodePoint(BigIntegers.asUnsignedByteArray(encodedPoint));
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

/**
 * Creates an ECKey that simply trusts the caller to ensure that point is really the result of multiplying the
 * generator point by the private key. This is used to speed things up when you know you have the right values
 * already. The compression state of the point will be preserved.
 */
public static ECKey fromPrivateAndPrecalculatedPublic(byte[] priv, byte[] pub) {
  checkNotNull(priv);
  checkNotNull(pub);
  return new ECKey(new BigInteger(1, priv), CURVE.getCurve().decodePoint(pub));
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

/**
 * Creates an ECKey that cannot be used for signing, only verifying signatures, from the given encoded point.
 * The compression state of pub will be preserved.
 */
public static ECKey fromPublicOnly(byte[] pub) {
  return new ECKey(null, CURVE.getCurve().decodePoint(pub));
}

代码示例来源：origin: com.madgag.spongycastle/core

public synchronized ECPoint getPoint()
{
  if (p == null)
  {
    p = c.decodePoint(encoding.getOctets()).normalize();
  }
  return p;
}

代码示例来源：origin: nuls-io/nuls

public static boolean verify(byte[] data, ECDSASignature signature, byte[] pub) {
  ECDSASigner signer = new ECDSASigner();
  ECPublicKeyParameters params = new ECPublicKeyParameters(CURVE.getCurve().decodePoint(pub), CURVE);
  signer.init(false, params);
  try {
    return signer.verifySignature(data, signature.r, signature.s);
  } catch (NullPointerException e) {
    log.error("Caught NPE inside bouncy castle", e);
    return false;
  }
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

/** Decompress a compressed public key (x co-ord and low-bit of y-coord). */
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
  X9IntegerConverter x9 = new X9IntegerConverter();
  byte[] compEnc = x9.integerToBytes(xBN, 1 + x9.getByteLength(CURVE.getCurve()));
  compEnc[0] = (byte)(yBit ? 0x03 : 0x02);
  return CURVE.getCurve().decodePoint(compEnc);
}