oaepdecryptionwithHSMprivatekey

使用HSM（硬件安全模块）的私钥进行OAEP解密的步骤如下：

1.从HSM中获取私钥 2.用私钥初始化解密器 3.使用解密器解密密文 4.返回解密后的明文

下面是使用Java代码实现的示例：

import java.security.Security;
import java.security.Provider;
import java.security.Key;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.security.interfaces.RSAPrivateKey;
import javax.crypto.Cipher;
import javax.crypto.spec.OAEPParameterSpec;
import javax.crypto.spec.PSource;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.BadPaddingException;

public class HSMDecryptor {

  private String keystorePath;
  private String keyAlias;
  private String keyPassword;

  public HSMDecryptor(String keystorePath, String keyAlias, String keyPassword) {
    this.keystorePath = keystorePath;
    this.keyAlias = keyAlias;
    this.keyPassword = keyPassword;
  }

  public byte[] decrypt(byte[] encryptedData) throws Exception {
    Security.addProvider(new com.safenetinc.luna.provider.LunaProvider());
    
    // Load keystore
    KeyStore ks = KeyStore.getInstance("Luna", "LunaProvider");
    ks.load(new FileInputStream(keystorePath), null);

    // Get certificate
    Certificate cert = ks.getCertificate(keyAlias);

    // Get private key
    RSAPrivateKey privateKey = (RSAPrivateKey) ks.getKey(keyAlias, keyPassword.toCharArray());

    // Initialize cipher
    Cipher cipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding");
    OAEPParameterSpec oaepParams = new OAEPParameterSpec("SHA-256", "MGF1", MGF1ParameterSpec.SHA256, PSource.PSpecified.DEFAULT);
    cipher.init(Cipher.DECRYPT_MODE, privateKey, oaepParams);

    // Decrypt
    byte[] decryptedData = cipher.doFinal(encryptedData);

    return decryptedData;
  }
}

可以使用此示例代码实现从HSM设备中解密OAEP加密的数据。