"does not match the signature"

most likely your signature calculation is not correct.  you may have missed some steps.  Azure has similar requirements, and it was pretty in-depth and not well described - mainly because the assumption is that libraries will be used to calculate it. 

There are multiple signature versions apparently:  AWS Signature Version 4 is the most current.  which did you use?

Also, there is often a time component, and you have to allow for clock skew.  typically, that is GMT.  

As a shortcut, you could check to see if a .net library exists for it and use the .net importer in PB to use it.

Hi,

Maybe you can get more help if you paste your powerbuilder code by using the "inser/edit code sample" icon on the toolbar:

Hi,

I have updated my code a bit & Now I get following error message. I have updated my PowerBuilder code as well below. Pls help!

<?xml version="1.0"?><ErrorResponse xmlns="http://queue.amazonaws.com/doc/2010-05-08
/"><Error><Type>Sender</Type><Code>MalformedVersion</Code><Message>Version not well formed: 2010-05-08
. Must be in YYYY-MM-DD format.</Message><Detail/></Error><RequestId>e96ee9d8-f694-5229-98a6-b2e5e20b8c5b</RequestId></ErrorResponse>

Regards,

Vishalakshi

Integer li_rc
RestClient lnv_RestClient
ResourceResponse lrr_response
String ls_url, ls_response, ls_auth, ls_secret_key, ls_host, ls_signing_key, ls_access_key, ls_string_to_sign
Blob lblb_signing_key, lblb_string_to_sign
String ls_utcdate


httpclient lhttp_client  
lhttp_client = CREATE httpclient 

CoderObject lnv_CoderObject
lnv_CoderObject = Create CoderObject

CrypterObject lnv_CrypterObject
lnv_CrypterObject = Create CrypterObject


ls_access_key = 'XXXXXX'
ls_secret_key = 'XXXXX'
ls_host = 'sqs.ap-south-1.amazonaws.com'

SELECT CURRENT UTC TIMESTAMP INTO :ls_utcdate FROM DUMMY;    //SQL ANYWHERE DB
ls_utcdate = String(ls_utcdate, "YYYYMMDD") + "T" + String(ls_utcdate, "HHMMSS") + "Z"


ls_string_to_sign = "AWS4-HMAC-SHA256"+Left(ls_utcdate, 8)+"/ap-south-1/sqs/aws4_request"
lblb_string_to_sign = lnv_CrypterObject.SHA(SHA256!, Blob(ls_string_to_sign,EncodingANSI!))

lblb_signing_key = lnv_CrypterObject.HMAC(HMACSHA256!, Blob("AWS4" + ls_secret_key, EncodingANSI!),Blob(Left(ls_utcdate, 8),EncodingANSI!))
lblb_signing_key = lnv_CrypterObject.HMAC(HMACSHA256!, lblb_signing_key, Blob("ap-south-1", EncodingANSI!))
lblb_signing_key = lnv_CrypterObject.HMAC(HMACSHA256!, lblb_signing_key, Blob("sqs", EncodingANSI!))
lblb_signing_key = lnv_CrypterObject.HMAC(HMACSHA256!, lblb_signing_key, Blob("aws4_request", EncodingANSI!))

ls_signing_key = lnv_CoderObject.HexEncode(lnv_CrypterObject.HMAC(HMACSHA256!, lblb_signing_key, lblb_string_to_sign))

ls_auth = "AWS4-HMAC-SHA256 Credential=" + ls_access_key + "/"+Left(ls_utcdate, 8)+"/ap-south-1/sqs/aws4_request,SignedHeaders=host;x-amz-date,Signature="+ls_signing_key
lhttp_client.SetRequestHeader( "content-type","application/x-www-form-urlencoded"+"~n")
lhttp_client.SetRequestHeader("x-amz-date", ls_utcdate+"~n")
lhttp_client.SetRequestHeader("host", ls_host+"~n")
lhttp_client.SetRequestHeader("authorization", ls_auth+"~n")

ls_url = "https://sqs.ap-south-1.amazonaws.com/123456653804/maven-notification-maven-8?Action=ReceiveMessage&Version=2012-11-05"+"~n"

li_rc = lhttp_client.SendRequest("GET", ls_url)

ls_response = lhttp_client.GetResponseStatusText()
//if li_rc = 1 and lhttp_client.GetResponseStatusCode() = 200 then
	lhttp_client.GetResponseBody(ls_response)
//end if

DESTROY lhttp_client
DESTROY lnv_CoderObject
DESTROY lnv_CrypterObject

RETURN ls_response