Android的Java的RSA解密 [英] Android-Java RSA decrypt

问题描述

我需要创建一个公共密钥RSA算法从一个二进制字符串。

我的code是：

 字符串PUBKEY =tihq / Gk3OUs5NzP + XTRKXBwSxHtB0TWn0RREcpXEtp316tyD9D​​zKaIbdKexb / MRR;

byte []的keyBytes = Base64.de code（PUBKEY，Base64.DEFAULT）;
//测试，如果是正确的：确定
Log.d（回应keyBytes，新的String（Base64.en code（keyBytes，Base64.DEFAULT）））;

的KeyFactory的KeyFactory = KeyFactory.getInstance（RSA）;
X509En codedKeySpec规格=新X509En codedKeySpec（keyBytes）;

RSAPublicKey公钥=（RSAPublicKey）keyFactory.generatePublic（规范）;
//公钥公钥=（公钥）keyFactory.generatePublic（规范）;
 

但我有此错误：

  java.security.spec.InvalidKeySpecException：java.lang.RuntimeException的：错误：0D0680A8：ASN1编码程序：ASN1_CHECK_TLEN：错标签
 

解决方案

解决。 现在的问题是，我有模数和指数，所以我一定要做到这一点：

 字符串PUBKEY =tihq / Gk3OUs5NzP + XTRKXBwSxHtB0TWn0RREcpXEtp316tyD9D​​zKaIbdKexb / MRR; // 64 caratteri
字符串指数=AQAB;

byte []的keyBytes = Base64.de code（PUBKEY，Base64.DEFAULT）;
byte []的exponentByte = Base64.de code（指数，Base64.DEFAULT）;

的KeyFactory的KeyFactory = KeyFactory.getInstance（RSA）;

RSAPublicKeySpec pubKeySpec =新RSAPublicKeySpec（新的BigInteger（keyBytes），新的BigInteger（exponentByte））;
RSAPublicKey公钥=（RSAPublicKey）keyFactory.generatePublic（pubKeySpec）;
 

i need to create a public key for RSA algorithm from a binary string.

My code is:

String pubKey = "tihq/Gk3OUs5NzP+XTRKXBwSxHtB0TWn0RREcpXEtp316tyD9DzKaIbdKexb/mRr";

byte[] keyBytes = Base64.decode(pubKey,Base64.DEFAULT);
//test if is correct: ok
Log.d("response keyBytes",new String(Base64.encode(keyBytes,Base64.DEFAULT)));

KeyFactory keyFactory = KeyFactory.getInstance("RSA");      
X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);

RSAPublicKey publicKey = (RSAPublicKey) keyFactory.generatePublic(spec);
//PublicKey publicKey = (PublicKey) keyFactory.generatePublic(spec);

But i have this error:

java.security.spec.InvalidKeySpecException: java.lang.RuntimeException: error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag

解决方案

SOLVED. The problem is that i have modulus and exponent and so i must to do this:

String pubKey = "tihq/Gk3OUs5NzP+XTRKXBwSxHtB0TWn0RREcpXEtp316tyD9DzKaIbdKexb/mRr"; //64 caratteri
String exponent = "AQAB";

byte[] keyBytes = Base64.decode(pubKey,Base64.DEFAULT);
byte[] exponentByte = Base64.decode(exponent,Base64.DEFAULT);

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger(keyBytes), new BigInteger(exponentByte));
RSAPublicKey publicKey = (RSAPublicKey) keyFactory.generatePublic(pubKeySpec);

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