hmac_sha1 签名

use URI::Escape qw(uri_unescape);
use MIME::Base64;
use Digest::HMAC_SHA1;
$str=Digest::HMAC_SHA1::hmac_sha1("GET&%2F&AccessKeyId%3DZ7xxxxxxx4xxVh%26Action%3DDescribeRegions%26Format%3DXML%26RegionId%3Dregion1%26SignatureMethod%3DHMAC-SHA1%26SignatureNonce%3DNwDAxvLU6tFE0DVb%26SignatureVersion%3D1.0%26TimeStamp%3D$SDATE%26Version%3D2014-05-26",'fQIJzvxOXZuc1AhLxtVMz0qxxxxxkj&');
$Signature = encode_base64($str,"");
print "$Signature\n";