将公钥存储在sharedPreferences中，并检索它 [英] Storing public key in sharedPreferences, and Retrieving it
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问题描述
现在我想要存储的公钥在SharedPreference。我可以将其存储为字符串。我可以检索它作为字符串。我需要将其转换为密钥，以传递给密码。
这是我尝试的
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance（RSA）; //使用RSA生成密钥
KeyPair keypair = keyPairGenerator.generateKeyPair（）; //获取生成的密钥
密码密码= Cipher.getInstance（RSA / ECB / PKCS1Padding）;
SharedPreferences sharedPreferences = context.getSharedPreferences（rsakey，MODE_PRIVATE）; //初始化SharedPerference
SharedPreferences.Editor editor = sharedPreferences.edit（）;
editor.putString（public，keypair.getPublic（）。toString（））;
editor.putString（private，keypair.getPrivate（）。toString（））;
editor.commit（）; //存储key在sharedpreference
final String sampletext =abcde;
//获取存储的键
String publicKey = sharedPreferences.getString（public，null）;
String privateKey = sharedPreferences.getString（private，null）;
// publicKey必须是KEY类型，所以我需要将publicKey转换为KEY，但它不会发生
cipher.init（Cipher.ENCRYPT_MODE ，公钥）;
byte [] encryptedtext = cipher.doFinal（sampletext.getBytes（））;
String encrypted_text = new String（Base64.encode（encryptedtext，Base64.NO_WRAP））;
// privateKey是字符串，它应该是类型KEY
cipher.init（Cipher.DECRYPT_MODE，privateKey）;
encryptedtext = Base64.decode（encrypted_text.getBytes（），Base64.NO_WRAP）;
encryptedtext = cipher.doFinal（encryptedtext）;
String decryptpted_text = new String（encryptedtext）;
这里，我面临的问题在cipher.init（Cipher.ENCRYPT_MODE，publicKey）;
publicKey包含从SahredPreferences提取的存储的PublicKey。它是String类型！如何将其转换为Key？
PS：这只是示例代码，在现实生活中我会将私钥存储在服务器中，公钥将发给用户
解决方案
希望这个帮助你
public void generateKeys（）{
try {
SharedPreferences SP;
SharedPreferences.Editor SPE; KeyBairGenerator生成器
generator = KeyPairGenerator.getInstance（RSA，BC）;
generator.initialize（256，新的SecureRandom（））;
KeyPair对= generator.generateKeyPair（）;
pubKey = pair.getPublic（）;
privKey = pair.getPrivate（）;
byte [] publicKeyBytes = pubKey.getEncoded（）;
String pubKeyStr = new String（Base64.encode（publicKeyBytes））;
byte [] privKeyBytes = privKey.getEncoded（）;
String privKeyStr = new String（Base64.encode（privKeyBytes））;
SPE = SP.edit（）;
SPE.putString（PublicKey，pubKeyStr）;
SPE.putString（PrivateKey，privKeyStr）;
SPE.commit（）;
} catch（NoSuchAlgorithmException e）{
e.printStackTrace（）;
} catch（NoSuchProviderException e）{
e.printStackTrace（）;
}
}
public PublicKey getPublicKey（）{
String pubKeyStr = SP.getString（PublicKey，）;
byte [] sigBytes = Base64.decode（pubKeyStr）;
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec（sigBytes）;
KeyFactory keyFact = null;
try {
keyFact = KeyFactory.getInstance（RSA，BC）;
} catch（NoSuchAlgorithmException e）{
e.printStackTrace（）;
} catch（NoSuchProviderException e）{
e.printStackTrace（）;
}
try {
return keyFact.generatePublic（x509KeySpec）;
} catch（InvalidKeySpecException e）{
e.printStackTrace（）;
}
返回null;
}
public String getPublicKeyAsString（）{
return SP.getString（PublicKey，）;
}
public PrivateKey getPrivateKey（）{
String privKeyStr = SP.getString（PrivateKey，）;
byte [] sigBytes = Base64.decode（privKeyStr）;
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec（sigBytes）;
KeyFactory keyFact = null;
try {
keyFact = KeyFactory.getInstance（RSA，BC）;
} catch（NoSuchAlgorithmException e）{
e.printStackTrace（）;
} catch（NoSuchProviderException e）{
e.printStackTrace（）;
}
try {
return keyFact.generatePrivate（x509KeySpec）;
} catch（InvalidKeySpecException e）{
e.printStackTrace（）;
}
返回null;
}
public String getPrivateKeyAsString（）{
return SP.getString（PrivateKey，）;
}
I am trying to use encrypt data using RSA. So far everything is fine. I can generate Private-Public keys, I can encrypt and Decrypt string successfully. Now i want stored Public key in SharedPreference. I can store it as string. I can retrieve it as string. I need to convert it to Key, to pass to cipher. Conversion from String to original format is not happening.
This is what i tried
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA"); //generate key using RSA
KeyPair keypair=keyPairGenerator.generateKeyPair(); //get generated key
Cipher cipher =Cipher.getInstance("RSA/ECB/PKCS1Padding");
SharedPreferences sharedPreferences=context.getSharedPreferences("rsakey", MODE_PRIVATE);//Initializing SharedPerference
SharedPreferences.Editor editor=sharedPreferences.edit();
editor.putString("public",keypair.getPublic().toString());
editor.putString("private",keypair.getPrivate().toString());
editor.commit();//store key in sharedpreference
final String sampletext="abcde";
//getting stored key
String publicKey = sharedPreferences.getString("public", null);
String privateKey = sharedPreferences.getString("private", null);
//publicKey must of type "KEY", so i need to convert publicKey to KEY, But its not happening
cipher.init(Cipher.ENCRYPT_MODE,publicKey);
byte[] encryptedtext=cipher.doFinal(sampletext.getBytes());
String encrypted_text=new String(Base64.encode(encryptedtext,Base64.NO_WRAP));
//privateKey is string, it supposed to be of type KEY
cipher.init(Cipher.DECRYPT_MODE,privateKey);
encryptedtext=Base64.decode(encrypted_text.getBytes(), Base64.NO_WRAP);
encryptedtext=cipher.doFinal(encryptedtext);
String decrypted_text=new String(encryptedtext);
Here, i am facing issue in cipher.init(Cipher.ENCRYPT_MODE,publicKey); publicKey contains stored PublicKey, extracted from SahredPreferences. It is of type String! How to convert it to Key?
PS:This is just sample code, in real life situation i will be storing private key in server and Public key will be issued to users.
解决方案
Hope this help you
public void generateKeys(){
try {
SharedPreferences SP;
SharedPreferences.Editor SPE;
KeyPairGenerator generator;
generator = KeyPairGenerator.getInstance("RSA", "BC");
generator.initialize(256, new SecureRandom());
KeyPair pair = generator.generateKeyPair();
pubKey = pair.getPublic();
privKey = pair.getPrivate();
byte[] publicKeyBytes = pubKey.getEncoded();
String pubKeyStr = new String(Base64.encode(publicKeyBytes));
byte[] privKeyBytes = privKey.getEncoded();
String privKeyStr = new String(Base64.encode(privKeyBytes));
SPE = SP.edit();
SPE.putString("PublicKey", pubKeyStr);
SPE.putString("PrivateKey", privKeyStr);
SPE.commit();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchProviderException e) {
e.printStackTrace();
}
}
public PublicKey getPublicKey(){
String pubKeyStr = SP.getString("PublicKey", "");
byte[] sigBytes = Base64.decode(pubKeyStr);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(sigBytes);
KeyFactory keyFact = null;
try {
keyFact = KeyFactory.getInstance("RSA", "BC");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchProviderException e) {
e.printStackTrace();
}
try {
return keyFact.generatePublic(x509KeySpec);
} catch (InvalidKeySpecException e) {
e.printStackTrace();
}
return null;
}
public String getPublicKeyAsString(){
return SP.getString("PublicKey", "");
}
public PrivateKey getPrivateKey(){
String privKeyStr = SP.getString("PrivateKey", "");
byte[] sigBytes = Base64.decode(privKeyStr);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(sigBytes);
KeyFactory keyFact = null;
try {
keyFact = KeyFactory.getInstance("RSA", "BC");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchProviderException e) {
e.printStackTrace();
}
try {
return keyFact.generatePrivate(x509KeySpec);
} catch (InvalidKeySpecException e) {
e.printStackTrace();
}
return null;
}
public String getPrivateKeyAsString(){
return SP.getString("PrivateKey", "");
}
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