AWS S3 - How to fix 'The request signature we calculated does not match the signature' error?

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I have searched on the web for over two days now, and probably have looked through most of the online documented scenarios and workarounds, but nothing worked for me so far.

I am on AWS SDK for PHP V2.8.7 running on PHP 5.3.

I am trying to connect to my S3 bucket with the following code:

// Create a `Aws` object using a configuration file

        $aws = Aws::factory('config.php');

        // Get the client from the service locator by namespace
        $s3Client = $aws->get('s3');

        $bucket = "xxx";
        $keyname = "xxx";

        try {
            $result = $s3Client->putObject(array(
                'Bucket'        =>      $bucket,
                'Key'           =>      $keyname,
                'Body'          =>      'Hello World!'
            $file_error = false;
        } catch (Exception $e) {
            $file_error = true;
            echo $e->getMessage();

My config.php file is as follows:


return array(
    // Bootstrap the configuration file with AWS specific features
    'includes' => array('_aws'),
    'services' => array(
        // All AWS clients extend from 'default_settings'. Here we are
        // overriding 'default_settings' with our default credentials and
        // providing a default region setting.
        'default_settings' => array(
            'params' => array(
                'credentials' => array(
                    'key'    => 'key',
                    'secret' => 'secret'

It is producing the following error:

The request signature we calculated does not match the signature you provided. Check your key and signing method.

I've already checked my access key and secret at least 20 times, generated new ones, used different methods to pass in the information (i.e. profile and including credentials in code) but nothing is working at the moment.

After two days of debugging, I finally discovered the problem...

The key I was assigning to the object started with a period i.e. ..\images\ABC.jpg, and this caused the error to occur.

I wish the API provides more meaningful and relevant error message, alas, I hope this will help someone else out there!

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I get this error with the wrong credentials. I think there were invisible characters when I pasted it originally.

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I had the same problem when tried to copy an object with some UTF8 characters. Below is a JS example:

var s3 = new AWS.S3();

    Bucket: 'somebucket',
    CopySource: 'path/to/Weird_file_name_ðÓpíu.jpg',
    Key: 'destination/key.jpg',
    ACL: 'authenticated-read'
}, cb);

Solved by encoding the CopySource with encodeURIComponent()

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Actually in Java i was getting same error.After spending 4 hours to debug it what i found that that the problem was in meta data in S3 Objects as there was space while sitting cache controls in s3 files.This space was allowed in 1.6.* version but in 1.11.* it is disallowed and thus was throwing the signature mismatch error

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If none of the other mentioned solution works for you , then try using

aws configure

this command will open a set of options asking for keys, region and output format.

Hope this helps!

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Troubleshooting Amazon S3, Getting these request IDs enables AWS Support to help you resolve the problems you're experiencing. Request IDs come in pairs, are returned in every response  An object consists of a file and optionally any metadata that describes that file. To store an object in Amazon S3, you upload the file you want to store to a bucket. When you upload a file, you can set permissions on the object and any metadata. Buckets are the containers for objects.

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  • So, the AWS SDK just implements a bunch of direct API calls. With AWS, every single call you make takes your private key (or secret above), and uses that to calculate a signature based on your access key, the current timestamp, plus a bunch of other factors. See…. It's a longshot, but given that they include the timestamp, perhaps your local environment's time is off?
  • I had the state bucket and key backwards and this is the error you get (signature doesn't match). Wtf terraform?
  • A leading slash also caused this issue for me. You need just path/to/file, not /path/to/file
  • And for me the issue were white spaces inside of key
  • Replacing /home/user/ with ~ and then changing it back again worked for me
  • To add to this, I was getting this error message when having a plus sign + in my key.
  • I simply dobuble-clicked on key_hash_lala/key_hash_continues and it selected only one part. Alas, how hard is it to tell the user "wrong passsword, dude!"?
  • The first time I had issues copying the key from the downloadable csv. For the second key i created, I just copied it from the the browser and didn't have any issues
  • +1 to @nthaxis - copying from the .csv caused a failure - copying directly from the browser and it works a treat