# Code examples for creating a signature for a signed URL
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This section includes downloadable application examples that demonstrate how to create signatures for signed URLs. Examples are available in Perl, PHP, C\#, and Java. You can use any of the examples to create signed URLs. The Perl script runs on Linux and macOS platforms. The PHP example will work on any server that runs PHP. The C\# example uses the .NET Framework.

The examples in this section use SHA-1 to hash and sign the policy statement. You can also use SHA-256. To use SHA-256, update the hash algorithm in the signing function (for example, replace `sha1` with `sha256` in OpenSSL calls, or use the equivalent SHA-256 constant in your language's cryptographic library). When you use SHA-256, include the `Hash-Algorithm=SHA256` query parameter in the signed URL.

For example code in JavaScript (Node.js), see [Creating Amazon CloudFront Signed URLs in Node.js](https://aws.amazon.com/blogs/developer/creating-amazon-cloudfront-signed-urls-in-node-js/) on the AWS Developer Blog.

For example code in Python, see [Generate a signed URL for Amazon CloudFront](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/cloudfront.html#examples) in the *AWS SDK for Python (Boto3) API Reference* and [this example code](https://github.com/boto/boto3/blob/develop/boto3/examples/cloudfront.rst) in the Boto3 GitHub repository.

**Topics**
+ [Create a URL signature using Perl](CreateURLPerl.md)
+ [Create a URL signature using PHP](CreateURL_PHP.md)
+ [Create a URL signature using C\# and the .NET Framework](CreateSignatureInCSharp.md)
+ [Create a URL signature using Java](CFPrivateDistJavaDevelopment.md)