Why Does My PHP Amazon S3 Upload Fail with a 'Request Signature Doesn't Match' Error?

Resolving the "Request Signature Doesn't Match" Error in Amazon S3 with PHP SDK

When attempting to establish a connection to an Amazon S3 bucket using the AWS SDK for PHP, you may encounter the error, "The request signature we calculated does not match the signature you provided." This can be a frustrating issue, especially after spending countless hours searching for solutions.

Troubleshooting Steps

In this specific scenario, the error occurred due to an unexpected source—the object key. Upon closer examination, it was discovered that the key being assigned to the object began with a period (.), indicating a relative path. This seemingly innocuous character caused the signature calculation to fail.

Solution

To resolve this issue, simply ensure that the object key does not start with a period. The following code will successfully upload an object to an S3 bucket:

$result = $s3Client->putObject(array(
    'Bucket' => $bucket,
    'Key' => 'images/ABC.jpg', // Key does not start with a period
    'Body' => 'Hello World!'
));

By removing the leading period from the object key, the signature calculation was successful, and the object was uploaded to the S3 bucket without any errors.

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