Android 获取签名公钥

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public

class
GetPublicKey {

    /**

     *
获取签名公钥

     *
@param mContext

     *
@return

     */

    protected

static
String getSignInfo(Context mContext) {

        String
signcode = "";

        try

{

            PackageInfo
packageInfo = mContext.getPackageManager().getPackageInfo(

                    GetAppInfo.getPackageName(mContext),
PackageManager.GET_SIGNATURES);

            Signature[]
signs = packageInfo.signatures;

            Signature
sign = signs[0];

            signcode
= parseSignature(sign.toByteArray());

            signcode
= signcode.toLowerCase();

        }
catch

(Exception e) {

            Log.e(Constants.TAG,
e.getMessage(), e);

        }

        return

signcode;

    }

    protected

static
String parseSignature(byte[]
signature) {

        String
sign = "";

        try

{

            CertificateFactory
certFactory = CertificateFactory

                    .getInstance("X.509");

            X509Certificate
cert = (X509Certificate) certFactory

                    .generateCertificate(new

ByteArrayInputStream(signature));

            String
pubKey = cert.getPublicKey().toString();

            String
ss = subString(pubKey);

            ss
= ss.replace(",",
"");

            ss
= ss.toLowerCase();

            int

aa = ss.indexOf("modulus");

            int

bb = ss.indexOf("publicexponent");

            sign
= ss.substring(aa + 8,
bb);

        }
catch

(CertificateException e) {

            Log.e(Constants.TAG,
e.getMessage(), e);

        }

        return

sign;

    }

    public

static
String subString(String sub) {

        Pattern
pp = Pattern.compile("\\s*|\t|\r|\n");

        Matcher
mm = pp.matcher(sub);

        return

mm.replaceAll("");

    }

}