使用objective c 和java实现的rsa sha256 适用于ios与android

package signtest; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.math.BigInteger; import java.nio.MappedByteBuffer; import java.nio.channels.FileChannel; import java.security.InvalidKeyException; import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.security.PrivateKey; import java.security.PublicKey; import java.security.SecureRandom; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.InvalidKeySpecException; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import java.util.ArrayList; import java.util.List; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.NoSuchPaddingException; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class RSAEncryptor { public static final String SIGN_ALGORITHMS = "SHA1WithRSA"; public static void main(String[] args){ // String privateKeyPath = "/Users/Isaacs/Desktop/RSA_KEYS/rsa_public_key.pem"; // replace your public key path here String privateKeyPath = "/Users/wu/Desktop/pkcs8_private_key.pem"; // replace your private path here RSAEncryptor rsaEncryptor=new RSAEncryptor(); try { //加载私钥 String private_key = rsaEncryptor.getKeyFromFile(privateKeyPath); rsaEncryptor.loadPrivateKey(private_key); String dirstr="/Users/wu/Desktop"; //计算文件的sha256 byte[] sha256bytes=rsaEncryptor.fileSHA256_1(dirstr + "/" + "testimg.jpg" ); String signstr=rsaEncryptor.signByPrivateKey_1(sha256bytes); System.out.println("签名值为:" + signstr); //加载公钥 String publicKeyPath = "/Users/wu/Desktop/public_key.pem"; String public_key=rsaEncryptor.getKeyFromFile(publicKeyPath); rsaEncryptor.loadPublicKey(public_key); boolean b=rsaEncryptor.doCheckWithPublicKey_1(sha256bytes, signstr); System.out.print("检查结果为:" + b); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 计算文件的sha256的值 * by wuchangkai163@163.com * @param input * @return */ public static String fileSHA256(String input) { try { // 拿到一个MD5转换器（®如果想要SHA1参数换成”SHA1”） MessageDigest messageDigest =MessageDigest.getInstance("SHA-256"); // 输入的字符串转换成字节数组 File file =new File(input); FileInputStream in = new FileInputStream(input); MappedByteBuffer byteBuffer = in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length()); // byte[] inputByteArray = input.getBytes(); // inputByteArray是输入字符串转换得到的字节数组 messageDigest.update(byteBuffer); // 转换并返回结果，也是字节数组，包含16个元素 byte[] resultByteArray = messageDigest.digest(); // 字符数组转换成字符串返回 BigInteger bi=new BigInteger(1,messageDigest.digest()); return bi.toString(16); } catch (Exception e) { return null; } } /** * 计算文件的sha256的值 * by wuchangkai163@163.com * @param input * @return */ public static byte[] fileSHA256_1(String input) { try { // 拿到一个MD5转换器（®如果想要SHA1参数换成”SHA1”） MessageDigest messageDigest =MessageDigest.getInstance("SHA-256"); // 输入的字符串转换成字节数组 File file =new File(input); FileInputStream in = new FileInputStream(input); MappedByteBuffer byteBuffer = in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length()); // byte[] inputByteArray = input.getBytes(); // inputByteArray是输入字符串转换得到的字节数组 messageDigest.update(byteBuffer); // 转换并返回结果，也是字节数组，包含16个元素 byte[] resultByteArray = messageDigest.digest(); // 字符数组转换成字符串返回 return resultByteArray; } catch (Exception e) { return null; } } /** * 使用私钥签名 * by wuchangkai163@163.com * @param content * @return */ public String signByPrivateKey(String content) { try { PrivateKey priKey = privateKey; java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS); signature.initSign(priKey); signature.update( content.getBytes()); byte[] signed = signature.sign(); return new BASE64Encoder().encode(signed); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 使用私钥签名 * by wuchangkai163@163.com * @param content * @return */ public String signByPrivateKey_1(byte[] content) { try { PrivateKey priKey = privateKey; java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS); signature.initSign(priKey); signature.update( content); byte[] signed = signature.sign(); return new BASE64Encoder().encode(signed); } catch (Exception e) { e.printStackTrace(); } return null; } /** * RSA验签名检查 * @param content 待签名数据 * @param sign 签名值 * @param encode 字符集编码 * @return 布尔值 */ public boolean doCheckWithPublicKey(String content, String sign,String encode) { try { RSAPublicKey pubKey = publicKey; java.security.Signature signature = java.security.Signature .getInstance(SIGN_ALGORITHMS); signature.initVerify(pubKey); signature.update( content.getBytes(encode) ); boolean bverify = signature.verify( new BASE64Decoder().decodeBuffer(sign) ); return bverify; } catch (Exception e) { e.printStackTrace(); } return false; } public boolean doCheckWithPublicKey(String content, String sign) { try { RSAPublicKey pubKey = publicKey ; java.security.Signature signature = java.security.Signature .getInstance(SIGN_ALGORITHMS); signature.initVerify(pubKey); signature.update( content.getBytes() ); boolean bverify = signature.verify( new BASE64Decoder().decodeBuffer(sign) ); return bverify; } catch (Exception e) { e.printStackTrace(); } return false; } public boolean doCheckWithPublicKey_1(byte[] content, String sign) { try { RSAPublicKey pubKey = publicKey ; java.security.Signature signature =