blocks|key|553939|text|上述答案的代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|553940|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;
}|code-block|syntax|javascript|553941|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Code for the above answer

<pre><code>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;
}
</code></pre>

blocks|key|337735|text|试试这个..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|337736|PublicKey+getPublicKey(byte[]+encodedKey)+throws+NoSuchAlgorithmException,+InvalidKeySpecException
{
++++KeyFactory+factory+=+KeyFactory.getInstance("RSA");
++++X509EncodedKeySpec+encodedKeySpec+=+new+X509EncodedKeySpec(encodedKey);
++++return+factory.generatePublic(encodedKeySpec);
}|code-block|syntax|javascript|337737|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this....

<pre><code>PublicKey getPublicKey(byte[] encodedKey) throws NoSuchAlgorithmException, InvalidKeySpecException
{
 KeyFactory factory = KeyFactory.getInstance("RSA");
 X509EncodedKeySpec encodedKeySpec = new X509EncodedKeySpec(encodedKey);
 return factory.generatePublic(encodedKeySpec);
}
</code></pre>

blocks|key|337953|text|使用海绵城堡|type|unstyled|depth|inlineStyleRanges|entityRanges|data|337954|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;
}|code-block|syntax|javascript|337955|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Using spongy castle

<pre><code>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;
}
</code></pre>

blocks|key|554023|text|您可以尝试此解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|554024|添加此依赖项：|554025|<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcpkix-jdk15on</artifactId>
<version>1.61</version>|code-block|syntax|javascript|554026|并使用此方法：|554027|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);
}|554028|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

you can try this solution:
add this dependency:
<pre><code>&lt;dependency&gt;
&lt;groupId&gt;org.bouncycastle&lt;/groupId&gt;
&lt;artifactId&gt;bcpkix-jdk15on&lt;/artifactId&gt;
&lt;version&gt;1.61&lt;/version&gt;
</code></pre>

and use this method:
<pre><code>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);
}
</code></pre>

blocks|key|554038|text|下面是一个代码片段：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|554039|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);
}|code-block|syntax|javascript|554040|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a code snippet:
<pre><code>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(&quot;RSA&quot;);
 BigInteger modulus = new BigInteger(1, Base64.decodeBase64(this.stringValue(&quot;n&quot;)));
 BigInteger exponent = new BigInteger(1, Base64.decodeBase64(this.stringValue(&quot;e&quot;)));
 return kf.generatePublic(new RSAPublicKeySpec(modulus, exponent));
} catch (InvalidKeySpecException var4) {
 throw new InvalidPublicKeyException(&quot;Invalid public key&quot;, var4);
} catch (NoSuchAlgorithmException var5) {
 throw new InvalidPublicKeyException(&quot;Invalid algorithm to generate key&quot;, var5);
}
</code></pre>

I have a bse64encoded string Public key from external source (Android Store) and I need to use it to verify signed content. How can I convert the string into an instance of the java.security.PublicKey interface. I am on Java 6 if that makes a difference. 

The key is (probably) generated using standard java lib and not bouncy castle (its from a remote team so I am not sure). Their sample code says to use Security.generatePublicKey(base64EncodedPublicKey); but the Security object in standard java has no such method.

How can I construct a java.security.PublicKey object from a base64 encoded string?

我有一个来自外部来源(安卓商店)的bse64encoded字符串公钥，我需要用它来验证签名的内容。如何将字符串转换为java.security.PublicKey接口的实例。我使用的是Java6，如果这有什么不同的话。密钥(可能)是使用标准java库生成的，而不是bouncy castle (它来自一个远程团队，所以我...

问如何从base64编码的字符串构造java.security.PublicKey对象？
EN

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问如何从base64编码的字符串构造java.security.PublicKey对象？
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