public static void StoreInAWS(String csvFile){
    Document doc = new Document(Name = 'documentName', Body = 
    Blob.valueOf(csvFile),  Type = 'csv', ContentType='application/vnd.ms-excel');
    system.debug(doc);
    String key = '';//mY key
    String secret = '';//my secret
    String formattedDateString = DateTime.now().formatGMT('EEE, dd MMM yyyy 
     HH:mm:ss z');
    String filename = 'folder/' + 'DocName ';//inside the bucket I have created a folder 
    named 'folder'
    String attachmentBody = csvFile;
    system.debug(attachmentBody);
    String bucketname = 'deletedrecords';//My bucket Name
    String host = 's3-us-east-1.amazonaws.com';
    system.debug('https://' + bucketname + '.' + host + '/' + filename);
    HttpRequest req = new HttpRequest();
   
    req.setMethod('PUT');
    req.setEndpoint('https://' + bucketname + '.' + host + '/'+ filename);
    req.setHeader('Host', bucketname + '.' + host);
    req.setHeader('Content-Length', String.valueOf(attachmentBody.length()));
    req.setHeader('Content-Type', doc.ContentType);
    req.setHeader('Connection', 'keep-alive');
    req.setHeader('Date', formattedDateString);
    req.setHeader('ACL', 'public-read-write');
    req.setBodyAsBlob(doc.body);
        
   // String stringToSign = 'PUT ' + doc.ContentType + '\n' + formattedDateString + '\n' + 
       '/' + bucketname + '/' + filename;
    //String encodedStringToSign = EncodingUtil.urlEncode(stringToSign, 'UTF-8');
   // Blob mac=Crypto.generateMac('HMACSHA1',blob.valueof(stringToSign),blob.valueof(secret));
    //String signedKey  = EncodingUtil.base64Encode(mac);
   // String authHeader = 'AWS' + ' ' + key + ':' + signedKey ;
    //req.setHeader('Authorization',authHeader);
    //String decoded = EncodingUtil.urlDecode(encodedStringToSign , 'UTF-8');
    system.debug('Sending the request');
    system.debug(req);
    Http http = new Http();
    HTTPResponse res = http.send(req);
    system.debug(res);
    System.debug(res.getBody());
}