我有来自外部源(Android Store)的bse64encoded字符串公钥,我需要使用它来验证签名内容。如何将字符串转换为java.security.PublicKey接口的实例。如果这有所不同,我在Java 6上。
关键是(可能)使用标准的java lib生成而不是弹性城堡(它来自远程团队所以我不确定)。他们的示例代码说使用Security.generatePublicKey(base64EncodedPublicKey);但是标准java中的Security对象没有这样的方法。
答案 0 :(得分:43)
上述答案的代码
public static PublicKey getKey(String key){
try{
byte[] byteKey = Base64.decode(key.getBytes(), Base64.DEFAULT);
X509EncodedKeySpec X509publicKey = new X509EncodedKeySpec(byteKey);
KeyFactory kf = KeyFactory.getInstance("RSA");
return kf.generatePublic(X509publicKey);
}
catch(Exception e){
e.printStackTrace();
}
return null;
}
答案 1 :(得分:22)
好笑咧嘴笑......试试这个
答案 2 :(得分:1)
试试这个......
PublicKey getPublicKey(byte[] encodedKey) throws NoSuchAlgorithmException, InvalidKeySpecException
{
KeyFactory factory = KeyFactory.getInstance("RSA");
X509EncodedKeySpec encodedKeySpec = new X509EncodedKeySpec(encodedKey);
return factory.generatePublic(encodedKeySpec);
}
答案 3 :(得分:0)
使用海绵城堡
public static PublicKey getPublicKeyFromString(String key) throws Exception {
KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);
org.spongycastle.asn1.pkcs.RSAPublicKey pkcs1PublicKey
= org.spongycastle.asn1.pkcs.RSAPublicKey.getInstance(decodeB64(key));
RSAPublicKeySpec keySpec
= new RSAPublicKeySpec(pkcs1PublicKey.getModulus(), pkcs1PublicKey.getPublicExponent());
PublicKey publicKey = keyFactory.generatePublic(keySpec);
return publicKey;
}
答案 4 :(得分:0)
您可以尝试以下解决方案:
添加此依赖项:
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcpkix-jdk15on</artifactId>
<version>1.61</version>
并使用此方法:
private Key parsePublicKey(String publicKey) throws IOException {
PEMParser pemParser = new PEMParser(new StringReader(publicKey));
JcaPEMKeyConverter converter = new JcaPEMKeyConverter();
SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfo.getInstance(pemParser.readObject());
return converter.getPublicKey(publicKeyInfo);
}
答案 5 :(得分:0)
这是一个代码片段:
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPublicKeySpec;
import org.apache.commons.codec.binary.Base64;
try {
KeyFactory kf = KeyFactory.getInstance("RSA");
BigInteger modulus = new BigInteger(1, Base64.decodeBase64(this.stringValue("n")));
BigInteger exponent = new BigInteger(1, Base64.decodeBase64(this.stringValue("e")));
return kf.generatePublic(new RSAPublicKeySpec(modulus, exponent));
} catch (InvalidKeySpecException var4) {
throw new InvalidPublicKeyException("Invalid public key", var4);
} catch (NoSuchAlgorithmException var5) {
throw new InvalidPublicKeyException("Invalid algorithm to generate key", var5);
}