Android RSA加密与解密

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首先定义一个公钥和私钥

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public static String pubKey="";

public static String priKey="";

RSA加密

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/**
 *  加密
 * @params str 要加密的字符串
 */
public static String Encrypt(String str) throws Exception {
    // base64编码的公钥
    byte[] decoded = Base64.decode(pubKey.getBytes(), Base64.DEFAULT);
    RSAPublicKey rsaPublicKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
    // RSA加密
    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    cipher.init(Cipher.ENCRYPT_MODE, rsaPublicKey);
    String outStr = Base64.encodeToString(cipher.doFinal(str.getBytes()), Base64.DEFAULT);
    return outStr;
}

RSA解密

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/**
 *  解密
 * @params str 要解密的字符串
 */
public static String Decrypt(String encryptData) throws Exception {
    byte[] decode = Base64.decode(encryptData.getBytes("UTF-8"), Base64.DEFAULT);
    // base64编码的私钥
    byte[] decoded = Base64.decode(priKey, Base64.DEFAULT);
    RSAPrivateKey rsaPriKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
    // RSA解密
    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    cipher.init(Cipher.DECRYPT_MODE, rsaPriKey);
    String outStr = new String(cipher.doFinal(decode));
    return outStr;
}

使用的时候

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try {

    String jiami=Encrypt("123456789");
    Log.d(TAG, "加密： "+ jiami);
    Log.d(TAG, "解密： "+ Decrypt(jiami));

}
catch (Exception exception)
{

}