How to Generate a Private Key from a PEM File Using OpenSSL on Mac 🎯
💡 When you need to “generate” a private key from a PEM file using OpenSSL on Mac, you’re usually looking to extract, decrypt, or convert an existing private key already stored within that PEM file, not create a new one. If your PEM file contains an encrypted private key (look for `BEGIN ENCRYPTED PRIVATE KEY` or `BEGIN RSA PRIVATE KEY` with encryption details), you can decrypt it. The most versatile command for modern PKCS#8 encrypted keys is `openssl pkcs8 -in encrypted_key.pem -out unencrypted_key.pem -nodes`. This command will prompt you for the existing passphrase and output an unencrypted private key in PEM format. For older, RSA-specific encrypted keys, use `openssl rsa -in encrypted_rsa.pem -out unencrypted_rsa.pem -nodes`. The `-nodes` flag is crucial as it ensures the output private key is saved without any encryption, making it immediately usable.
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