华为对象存储 --生成Header鉴权签名

生成Header鉴权签名：

1. 计算StringToSign:
					
StringToSign = HTTP-Verb + "\n" + 
Content-MD5 + "\n" + 
Content-Type + "\n" + 
Date + "\n" + 
CanonicalizedHeaders + 
CanonicalizedResource

2. 计算Signature:
					
Signature = 
Base64(Hmac-sha1(SK, UTF-8-Encoding-Of(StringToSign)))

3. 计算Authorization

Authorization = "OBS " + AK + ":" + Signature

HTTP-Verb

Content-MD5

Content-Type

Date

Canonicalized Headers

：

Canonicalized Resource