java 解析国密SM2算法证书

首先说明用Java自带的解析x509证书类，是不能解析sm2算法的证书，运行会抛出异常。

用开源库bouncycastle可以解析、具体代码

private byte[] getCSPK(byte[] csCert)

{

InputStream inStream = new ByteArrayInputStream(csCert);

ASN1Sequence seq = null;

ASN1InputStream aIn;

try

{

aIn = new ASN1InputStream(inStream);

seq = (ASN1Sequence)aIn.readObject();

X509CertificateStructure cert = new X509CertificateStructure(seq);

cert.getVersion();

ASN1Primitive publicKey = cert.getSubjectPublicKeyInfo().getPublicKey();

byte[] encodedPublicKey = publicKey.getEncoded();

byte[] eP = new byte[64];

System.arraycopy(encodedPublicKey, 5, eP, 0, eP.length);

return eP;

}

catch (Exception e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

return null;

}

所需要的jar包：http://download.csdn.net/detail/a956959099/7631425

java 解析国密SM2算法证书