次のコードを実行していますBad Padding Exception - Data must start with zero。何か案は？
ここにコードがあります
public class test {
public static void main(String[] args) throws NoSuchAlgorithmException,
NoSuchProviderException, InvalidKeyException,
SignatureException, NoSuchPaddingException,
IllegalBlockSizeException, BadPaddingException {
KeyPair k=Utilities.keys(2048);
PublicKey public_key=Utilities.public_key(k);
PrivateKey private_key=Utilities.private_key(k);
String hex1=Lib.stringToHex("test1/test2/test3");
byte[] plaintext=Lib.toByteArray(hex1);
byte [] cipher=Utilities.Encrypt_RSA(plaintext, public_key);
System.out.println(cipher.length);
byte[] newArray = new byte[128];
byte[] newArray2 = new byte[128];
// System.arraycopy(cipher, 0, newArray, 0, 512);
for (int i=0;i<cipher.length;i++){
if(i<cipher.length/2){
newArray[i]=cipher[i];
}
else if((i>cipher.length/2)&&(i<cipher.length)){
newArray2[i-128]=cipher[i];
}
}
// System.arraycopy(cipher, 512, newArray2, 0, 512);
byte[] cipher2=Utilities.Encrypt_RSA_Pr(newArray, private_key);
byte[] cipher3=Utilities.Encrypt_RSA_Pr(newArray2, private_key);
System.out.println(cipher2.length+" cipher2");
System.out.println(cipher3.length+" cipher3");
byte [] plain1=Utilities.Decrypt_RSA_Pub(cipher2,public_key);
byte [] plain2=Utilities.Decrypt_RSA_Pub(cipher3,public_key);
System.out.println(plain1.length);
System.out.println(plain2.length);
byte[] finald=new byte[256];
for(int i=0;i<256;i++){
if(i<128){
finald[i]=plain1[i];
}
else{
finald[i]=plain2[i-128];
}
}
for(int i=0;i<plain1.length;i++){
if(i>=64){
plain1[i]='\0';
}
}
System.out.println(plain1.length);
System.out.println(finald.length;
byte[] plainfinal=Utilities.Decrypt_RSA(finald, private_key);
暗号化/復号化に使用する方法は次のとおりです。
public static byte[] Encrypt_RSA(byte[] plaintext,PublicKey key) throws
InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException,
IllegalBlockSizeException, BadPaddingException,NoSuchProviderException{
Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding");
c.init(Cipher.ENCRYPT_MODE,key);
byte [] ciphertext = c.doFinal(plaintext);
return ciphertext;
}
public static byte[] Decrypt_RSA(byte []ciphertext,PrivateKey key) throws
NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
IllegalBlockSizeException, BadPaddingException,NoSuchProviderException{
Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding");
c.init(Cipher.DECRYPT_MODE,key);
byte [] plaintext=c.doFinal(ciphertext);
return plaintext;
}
public static byte[] Encrypt_RSA_Pr(byte[] plaintext,PrivateKey key) throws
NoSuchAlgorithmException, NoSuchPaddingException,
IllegalBlockSizeException, BadPaddingException, InvalidKeyException{
Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding");
c.init(Cipher.ENCRYPT_MODE,key);
byte [] ciphertext = c.doFinal(plaintext);
return ciphertext;
}
public static byte[] Decrypt_RSA_Pub(byte []ciphertext,PublicKey key) throws
NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
IllegalBlockSizeException,BadPaddingException,NoSuchProviderException{
Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding");
c.init(Cipher.DECRYPT_MODE,key);
byte [] plaintext=c.doFinal(ciphertext);
return plaintext;
}