+/*!
+ @function SecCmsSignerInfoGetAppleExpirationTime
+ @abstract Return the expriation time, in CFAbsoluteTime, of a CMS signerInfo.
+ @param sinfo SignerInfo data for this signer.
+ @discussion Returns a CFAbsoluteTime
+ @result A return value of SECFailure is an error.
+ */
+extern OSStatus
+SecCmsSignerInfoGetAppleExpirationTime(SecCmsSignerInfoRef sinfo, CFAbsoluteTime *etime);
+