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app/src/main/java/com/gh/common/util/RSEUtils.java

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+package com.gh.common.util;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PublicKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.X509EncodedKeySpec;
+
+import javax.crypto.Cipher;
+
+import android.util.Base64;
+
+public class RSEUtils {
+
+	/**
+	 * 公钥
+	 */
+	private static final String PUBLIC_KEY = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQConqikyOCl5f/VO/vZ+s6wVOhFJcI7o7hYvaLQ5Lzt5/HXbozTeRrGonKFPJurapf9hzjkg0F4/BNFMGXRVlReVdwh+Px5rbXU/ceikF8Ouf67qxiGAuDVC+4e3eIHh+mH68DlqWFJ78sB80iSLXelflGuHkbTOTtaC5F2l+AgxQIDAQAB";
+
+	/**
+	 * 加密算法RSA
+	 */
+	private static final String KEY_ALGORITHM = "RSA";
+
+	/**
+	 * 得到公钥
+	 * 
+	 * @return PublicKey 公钥
+	 * @throws NoSuchAlgorithmException
+	 * @throws InvalidKeySpecException
+	 */
+	private static PublicKey getPublicKeyFromX509() throws Exception {
+		byte[] decodedKey = Base64.decode(PUBLIC_KEY, Base64.DEFAULT);
+		X509EncodedKeySpec x509 = new X509EncodedKeySpec(decodedKey);
+		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
+		return keyFactory.generatePublic(x509);
+	}
+
+	/**
+	 * 使用公钥加密
+	 * 
+	 * @param content
+	 * @param key
+	 * @return
+	 */
+	public static String encryptByPublic(String content) {
+		try {
+			PublicKey pubkey = getPublicKeyFromX509();
+
+			Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
+			cipher.init(Cipher.ENCRYPT_MODE, pubkey);
+
+			byte[] data = content.getBytes("UTF-8");
+			byte[] output = cipher.doFinal(data);
+
+			String s = new String(Base64.encode(output, Base64.DEFAULT));
+
+			return s;
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		return null;
+	}
+
+	/**
+	 * 使用公钥解密
+	 * 
+	 * @param content
+	 *            密文
+	 * @param key
+	 *            商户私钥
+	 * @return 解密后的字符串
+	 */
+	public static String decryptByPublic(String content) {
+		try {
+			PublicKey pubkey = getPublicKeyFromX509();
+			Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
+			cipher.init(Cipher.DECRYPT_MODE, pubkey);
+			InputStream ins = new ByteArrayInputStream(Base64.decode(content,
+					Base64.DEFAULT));
+			ByteArrayOutputStream baos = new ByteArrayOutputStream();
+			byte[] buffer = new byte[128];
+			int len;
+			while ((len = ins.read(buffer)) != -1) {
+				byte[] block = null;
+				if (buffer.length == len) {
+					block = buffer;
+				} else {
+					block = new byte[len];
+					for (int i = 0; i < len; i++) {
+						block[i] = buffer[i];
+					}
+				}
+				baos.write(cipher.doFinal(block));
+			}
+			return new String(baos.toByteArray(), "utf-8");
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		return null;
+	}
+
+}