获取签名公钥

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("");
}

}