我有一个用例，我想用c中的私钥加密一些数据，用java中的公钥解密它。
我使用openssl生成了公钥/私钥。我可以运行一个c代码来使用私钥加密数据。
类似于以下代码：

# include <openssl/pem.h>

# include <openssl/ssl.h>

# include <openssl/rsa.h>

# include <openssl/evp.h>

# include <openssl/bio.h>

# include <openssl/err.h>

int padding = RSA_PKCS1_PADDING;

char * data;
char *encrypted;

FILE * fp = fopen(<private_key_file>,"rb");
RSA *rsa= RSA_new() ;
rsa = PEM_read_RSAPrivateKey(fp, &rsa,NULL, NULL);
RSA_private_encrypt(data_len,data,encrypted,rsa,padding);

这工作得很好，我也可以用c中的公钥解密它。我不能用java中的公钥解密相同的密码。为此，我将公钥转换为der格式： $ openssl rsa -in private_key.pem -pubout -outform DER -out public_key.der 我使用以下代码

public String decrypt(byte[] encrypted) throws Exception
{
    Cipher cipher = Cipher.getInstance("RSA");

    KeyFactory kf = KeyFactory.getInstance("RSA");

    byte[] encKey = readFromFile(PUBLIC_KEY_FILE, false);

    X509EncodedKeySpec ks = new X509EncodedKeySpec(encKey);

    PublicKey pk = kf.generatePublic(ks);

    cipher.init(Cipher.DECRYPT_MODE, pk);

    byte[] plainText = cipher.doFinal(encrypted);

    return new String(plainText,"UTF-8");
}

我的java代码有以下异常。

Exception in thread "main" javax.crypto.BadPaddingException: Decryption error
at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:380)
at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:291)
at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:356)
at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:389)
at javax.crypto.Cipher.doFinal(Cipher.java:2121)
at AssyncKeyEncryptTest.decrypt(AssyncKeyEncryptTest.java:198)
at AssyncKeyEncryptTest.test(AssyncKeyEncryptTest.java:45)
at AssyncKeyEncryptTest.main(AssyncKeyEncryptTest.java:32)

有人能帮我解决在java中使用公钥解密数据的错误吗？