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The format for signature string is:
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StringToSign = VERB + "\n" +
Content-Encoding + "\n" +
Content-Language + "\n" +
Content-Length + "\n" +
Content-MD5 + "\n" +
Content-Type + "\n" +
Date + "\n" +
If-Modified-Since + "\n" +
If-Match + "\n" +
If-None-Match + "\n" +
If-Unmodified-Since + "\n" +
Range + "\n" +
CanonicalizedHeaders +
CanonicalizedResource; |
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The StringToSIgn is then encoded using HMAC-SHA256 algorithm over the UTF-8-encoded signature string which is then used as an Authorization Header using syntax:
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Authorization="SharedKey <AccountName>:<Signature>" |
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LIST BLOB:
In the LIST BLOB operation lists the blobs in the container. The StringToSign for LIST BLOB will be:
Code Block title StringToSign for LIST BLOB operation $stringToSign = "GET" ` + "`n" ` + "`n" ` + "`n" ` + (($ContentLength -gt -1) ? $ContentLength : '') + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "x-ms-blob-type:BlockBlob" + "`n" ` + "x-ms-date:$(Get-Date (Get-Date $Now).ToUniversalTime() -Format 'R')" + "`n" ` + "x-ms-version:$Version" + "`n" ` + "/$Account/$Container" + "`n" ` + "comp:list" + "`n" ` + "restype:container"
where $Account is the account by which request is generated. $Container is the name of the container.
GET BLOB:
The GTE BLOB operation displays the content of the blob. So, for the get operation it is required to pass the blob name whose content is to be read/get. So, the StringToSign for GET BLOB will be:Code Block title StringToSign for GET BLOB operation $stringToSign = 'GET' ` + "`n" ` + "`n" ` + "`n" ` + (($ContentLength -gt -1) ? $ContentLength : '') + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "x-ms-blob-type:BlockBlob" + "`n" ` + "x-ms-date:$(Get-Date (Get-Date $Now).ToUniversalTime() -Format 'R')" + "`n" ` + "x-ms-version:$Version" + "`n" ` + "/$Account/$Container/$Blob"
where $Account is the account by which request is generated. $Container is the name of the container. $Blob is the name of the blob whose content is to be Get.
PUT BLOB
The PUT BLOB operation creates a new block or updates an existing block blob. The PUT BLOB creates a BLOB of a length of content in a file so it is required to pass the length of the blob so that it can allocate a that much memory in the Container and can write the file content to the blob. The StringToSign for the PUT BLOB will be:Code Block title StringToSign for PUT BLOB operation $stringToSign = 'PUT' ` + "`n" ` + "`n" ` + "`n" ` + (($ContentLength -gt -1) ? $ContentLength : '') + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "`n" ` + "x-ms-blob-type:BlockBlob" + "`n" ` + "x-ms-date:$(Get-Date (Get-Date $Now).ToUniversalTime() -Format 'R')" + "`n" ` + "x-ms-version:$Version" + "`n" ` + "/$Account/$Container/$Blob"
where $Account is the account by which request is generated. $Container is the name of the container. $Blob is the name of the blob which is to be created. The $ContentLength for the LIST BLOB and GET BLOB operation will be empty but for the PUT BLOB it required to pass the Content Length for the file to be created.
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