遵循规则（url_decode(path) + query_string + ‘\n’ + body）
验签内容如下：
/oss/callbackMethod\nfilename=dp_dev/wmg11.jpg&size=71721&mimeType=image/jpeg&height=582&width=667
public static boolean doCheck(String content, byte[] sign, String publicKey) {
try {
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
byte[] encodedKey = BinaryUtil.fromBase64String(publicKey);
PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));
java.security.Signature signature = java.security.Signature.getInstance("MD5withRSA");
signature.initVerify(pubKey);
signature.update(content.getBytes());
boolean bverify = signature.verify(sign);
return bverify;
} catch (Exception e) {
e.printStackTrace();
}
return false;
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