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ディアーズ、Androidの暗号化RSA例外:InvalidKeyException
私はdecryptStringが働くと、「java.security.InvalidKeyException:ニードRSAプライベートまたはパブリックキー」をスローしない理由を理解するのに役立つ必要があります。暗号化メソッドを呼び出すとき、私は秘密鍵/証明書によって公開鍵を使用します。
ありがとうございました!
public class KeysHandler {
/***
* Generate and store in AndroidKeyStore a security KeyPair keys.
* @param alias - Alias to create the key.
* @return KeyPair object with: private and public key.
*/
public static KeyPair generateKeyPair(String alias) {
KeyPair kp = null;
if (alias != null) {
try {
KeyPairGenerator kpg = KeyPairGenerator.getInstance(KeyProperties.KEY_ALGORITHM_RSA, "AndroidKeyStore");
kpg.initialize(new KeyGenParameterSpec.Builder(alias,
KeyProperties.PURPOSE_SIGN |
KeyProperties.PURPOSE_VERIFY |
KeyProperties.PURPOSE_ENCRYPT |
KeyProperties.PURPOSE_DECRYPT)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_PKCS1)
.build());
kp = kpg.generateKeyPair();
} catch (NoSuchProviderException | NoSuchAlgorithmException | InvalidAlgorithmParameterException ex) {
kp = null;
}
}
return kp;
}
public static String encryptString(String alias, String textToEncrypt) {
String cipheredText = null;
try {
KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry)keyStore.getEntry(alias, null);
// Encrypt the text
if(textToEncrypt != null && textToEncrypt.length() > 0) {
Cipher input = Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidOpenSSL");
input.init(Cipher.ENCRYPT_MODE, privateKeyEntry.getCertificate().getPublicKey());
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
CipherOutputStream cipherOutputStream = new CipherOutputStream(
outputStream, input);
cipherOutputStream.write(textToEncrypt.getBytes("UTF-8"));
cipherOutputStream.close();
byte[] vals = outputStream.toByteArray();
cipheredText = Base64.encodeToString(vals, Base64.DEFAULT);
}
} catch (Exception e) {
cipheredText = null;
}
return cipheredText;
}
public static String decryptString(String alias, String cipheredText) {
String clearText = null;
try {
KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry)keyStore.getEntry(alias, null);
Cipher output = Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidOpenSSL");
output.init(Cipher.DECRYPT_MODE, privateKeyEntry.getPrivateKey());
CipherInputStream cipherInputStream = new CipherInputStream(
new ByteArrayInputStream(Base64.decode(cipheredText, Base64.DEFAULT)), output);
ArrayList<Byte> values = new ArrayList<>();
int nextByte;
while ((nextByte = cipherInputStream.read()) != -1) {
values.add((byte)nextByte);
}
byte[] bytes = new byte[values.size()];
for(int i = 0; i < bytes.length; i++) {
bytes[i] = values.get(i).byteValue();
}
clearText = new String(bytes, 0, bytes.length, "UTF-8");
} catch (Exception e) {
clearText = null;
}
return clearText;
}
}
@FrederikHV本当にありがとう、 "AndroidOpenSSL"を省略すると魅力的でした。あなたに良い一週間を! – Mateus
どこを省略しましたか?暗号化と復号化では両方の場所が省略されていますか?ありがとう。 – sandeepmaaram
@sandeepmaaramどこでもCipher.getInstance – FrederikVH