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Convert JWK to PEM with Validation

Overview

This script, jwk_to_pem_with_validation.py, converts an RSA JSON Web Key (JWK) into a standard PEM-encoded RSA private key. It also includes validation functionality to ensure the generated key is correct and extracts the public key.

Prerequisites

Ensure you have Python 3 installed along with the necessary dependencies. You can install the required package using:

pip install cryptography

or

pip install -r ./requirements.txt

Usage

1. Prepare the JWK file

Save your RSA JWK as a JSON file in the same location as the script, e.g., test_key.jwk. The structure should resemble the following:

{
    "key": {
        "kty": "RSA",
        "n": "...",  
        "e": "AQAB",
        "d": "...",  
        "p": "...",
        "q": "...",
        "dp": "...",
        "dq": "...",
        "qi": "..."
    }
}

or, update line 77 to point to your JWK instead of test_key.jwk

    # Load the JWK from file (update filename if needed)
    with open("test_key.jwk", "r") as f:
        jwk_data = json.load(f)["key"]

2. Run the script

Execute the script with:

python jwk_to_pem_with_validation.py

3. Output Files

After running the script, the following files will be generated:

  • rsa_private.pem: The converted RSA private key in PEM format.
  • rsa_public.pem: The extracted RSA public key in PEM format.

4. Expected Output

Upon execution, you should see output similar to:

🔑 RSA Private Key saved as rsa_private.pem

🔍 Validating RSA Key...
✅ RSA Key is valid
Modulus (n): output_value_here
Exponent (e): output_value_here
🔓 RSA Public Key saved as rsa_public.pem

5. Validating the Output

You can verify the generated PEM key using OpenSSL:

Check the private key format:

openssl rsa -in rsa_private.pem -check

Output:

RSA key ok

Extract and verify the public key:

openssl rsa -in rsa_private.pem -pubout -out rsa_public.pem
openssl rsa -in rsa_public.pem -pubin -text -noout

This should match the modulus (n) and exponent (e) from the original JWK.

Notes

  • The script supports PKCS#8 format for better compatibility.
  • If you need an encrypted private key, update the script to pass a password using serialization.BestAvailableEncryption(b'password').
  • If you encounter issues, ensure that the JWK is properly formatted and includes all necessary fields (n, e, d, p, q, dp, dq, qi).