将SubjectPublicKeyInfo格式的公钥转换为RSAPublicKey格式java
PublicKey.getEncoded()返回一个包含SubjectPublicKeyInfo(x.509)格式的公钥的字节数组,如何将其转换为RSA公钥编码?
使用Bouncy Castle的SubjectPublicKeyInfo
,如下所示:
byte[] encoded = publicKey.getEncoded(); SubjectPublicKeyInfo subjectPublicKeyInfo = new SubjectPublicKeyInfo( ASN1Sequence.getInstance(encoded)); byte[] otherEncoded = subjectPublicKeyInfo.parsePublicKey().getEncoded();
没有BouncyCastle:
PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(publicKeyBinary));
以下代码片段对我有用,但不得不使用BouncyCastle。
byte[] keyBytes = key.getEncoded(); // X.509 for public key SubjectPublicKeyInfo subPkInfo = new SubjectPublicKeyInfo((ASN1Sequence)ASN1Object.fromByteArray(keyBytes)); byte[] rsaformat = subPkInfo.getPublicKey().getDEREncoded();