RSA加密

[GzLiotu]

只有一个密钥，能不能用java的RSA对字符串进行加密？请大虾帮忙。。。

[爱跳舞的铅笔头]

可以的，网上找找案例

[tianfang]

RSA是密钥对，公钥+私钥，任何一个都可以加密，用另外一个解密。 你有一个可以加密，但就解不了了

[GzLiotu]

嗯，只要加密就行了，还有RSA加密C#格式转java格式清不清楚？

[tianfang]

加密的时候 需要对数据进行补齐，padding，要公开padding方法

[GzLiotu]

能说得清楚些吗？

[GzLiotu]

/** * 获取RSA加密信息 * @param info * @return */ public static String getRSAInfo(String dataStr){ byte[] en = encrypt(dataStr); String info = Base64.encode(en); try { info = URLEncoder.encode(info,"UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return info; } public static byte[] encrypt(String info) { try { byte[] modulusBytes = Base64.decode("yrEAJvQfhhoZcWMzsQw0LZd2OqOTMgOzVl7Ja2w6R1rF+tl+V+6T08zvZAhWye2omdZ8JccefDQNkYTqIcNXu9XqYMTl79FaFVt32wykCIHnvfN8IafVnQKcuWpWDuCbZAocoBisT6LWugyiXWe7cr+2qFSW4nL5YIQ4jxXJn8U="); byte[] exponentBytes = Base64.decode("AQAB"); BigInteger modulus = new BigInteger(1, modulusBytes); BigInteger exponent = new BigInteger(1, exponentBytes); RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, exponent); KeyFactory fact = KeyFactory.getInstance("RSA"); PublicKey pubKey = fact.generatePublic(rsaPubKey); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, pubKey); byte[] cipherData = cipher.doFinal(new String(info).getBytes()); return cipherData; } catch (Exception e) { e.printStackTrace(); } return null; }

[tianfang]

使用公钥加密 public static byte[] encryptByPublicKey(byte[] data, byte[] keyBytes ) throws Exception { // 取得公钥 X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(“RSA”); Key publicKey = keyFactory.generatePublic(x509KeySpec); // 对数据加密 Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.ENCRYPT_MODE, publicKey); return cipher.doFinal(data); }