.net与java中的互操作（rsa签名与验签、加密与解密）

package signDemo; import java.io.UnsupportedEncodingException; import java.math.BigInteger; import java.security.GeneralSecurityException; import java.security.KeyFactory; import java.security.NoSuchAlgorithmException; import java.security.PublicKey; import java.security.Signature; import java.security.spec.RSAPublicKeySpec; import java.util.Base64; import java.util.Base64.Decoder; import javax.crypto.Cipher; import javax.crypto.NoSuchPaddingException; public class singDemo { public static void main(String args[]) throws Exception { //待加密数据 String someString = "amount=123&name=中文测试&orderId=001"; //。net端使用私钥生成的签名 String signature = "DZM+uSO2SzhapmhQTSPmOpRSa1OK3zvUq6ZmtwhJeg0MI+6FlibF1eiJMN/EyuvzhBfs+MsXtEZKPeGqTU8xPgAIACxVcM8BAdRk7gAxj8UmMYSIxCyLhWOfAQ6XGRsQX8srHpkQxm0uLb7+A1qiGqiDEsxmu/wm13O5ZERdN/Q="; String modulus = "18lmL3io599boCL7+8TtTkSYI2b9uLjAfw0t1gndISoLu5w8YmvYLBGUpU/IOwinCrJgRSU69xXtTNXS3K6I2IGdWax+Ts4f7kj1VSXGrjAAyAxUoBMwTry69X9J2bxcHu/dxpMuBLt/Vzh+zRyZWYqCdx/2t8Hbl90ydgA8Urs="; String exponent = "AQAB"; Decoder decoder = Base64.getDecoder(); BigInteger BIModulus = new BigInteger(1, decoder.decode(modulus)); BigInteger BIExponent = new BigInteger(1, decoder.decode(exponent)); RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(BIModulus, BIExponent); PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(publicKeySpec); Signature sign = Signature.getInstance("SHA1withRSA"); sign.initVerify(publicKey); sign.update(someString.getBytes("utf-8")); //验证签名 boolean ok = sign.verify(decoder.decode(signature)); System.out.println("Verify Result:" + ok); //使用公钥加密 System.out.println("Encrypt val:" + encrypt("hello",publicKey)); } private static String encrypt(String plainTextData,PublicKey publicKey) throws NoSuchAlgorithmException, GeneralSecurityException, UnsupportedEncodingException{ Cipher cipher = null; // 使用默认RSA cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding"); // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider()); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] output = cipher.doFinal(plainTextData.getBytes("utf-8")); return Base64.getEncoder().encodeToString(output); } }