ssl - How to convert .pem into .key?

Ssl - How to convert .pem into .key?

A .pem file can contain various types of data, including certificates, private keys, and certificate chains. If your .pem file contains a private key and you want to extract it into a separate .key file, you can use OpenSSL, a widely-used open-source tool for working with SSL/TLS certificates and keys.

Here's how you can extract a private key from a .pem file and save it as a separate .key file using OpenSSL:

openssl rsa -in yourfile.pem -out yourfile.key

Replace yourfile.pem with the path to your .pem file containing the private key. This command will extract the private key from the .pem file and save it as yourfile.key.

If your .pem file contains multiple items (e.g., a private key along with a certificate and possibly an intermediate CA certificate), you may need to specify the appropriate key using the -key option. For example:

openssl rsa -in yourfile.pem -out yourfile.key -outform PEM

The -outform PEM option specifies that the output should be in PEM format, which is the standard format for SSL/TLS keys and certificates.

After running the command, you should have a separate .key file containing the private key extracted from the original .pem file. You can then use this .key file as needed for SSL/TLS configuration or other purposes.

Examples

  1. Convert PEM to KEY OpenSSL

    • Description: Demonstrates how to convert a PEM file containing a private key to a separate KEY file using OpenSSL.
    openssl rsa -in key.pem -outform PEM -out key.key

    This OpenSSL command converts a PEM-encoded private key key.pem into a separate PEM-encoded key file key.key.

  2. Convert PEM to KEY using OpenSSL

    • Description: Shows another method to convert PEM to KEY using OpenSSL.
    openssl pkey -in key.pem -out key.key -outform PEM

    This command converts a PEM-encoded private key key.pem into a separate PEM-encoded key file key.key using OpenSSL's pkey command.

  3. OpenSSL PEM to KEY conversion

    • Description: Provides an example of using OpenSSL to convert a PEM file to a KEY file.
    openssl pkcs8 -in key.pem -topk8 -nocrypt -out key.key

    This command converts a PEM-encoded private key key.pem to a PKCS#8 format key file key.key using OpenSSL.

  4. Convert .pem to .key file OpenSSL

    • Description: Illustrates converting a PEM file to a KEY file format using OpenSSL.
    openssl rsa -in key.pem -out key.key

    This command converts a PEM-encoded private key key.pem to a RSA private key file key.key using OpenSSL's rsa command.

  5. Convert PEM to KEY without passphrase

    • Description: Shows how to convert a PEM file to a KEY file without using a passphrase.
    openssl rsa -in key.pem -out key.key -nodes

    This command converts a PEM-encoded private key key.pem to a KEY file key.key without encryption (no DES passphrase).

  6. Convert PEM private key to KEY format

    • Description: Converts a PEM-encoded private key to the KEY format using OpenSSL.
    openssl rsa -in key.pem -outform DER -out key.key

    This command converts a PEM-encoded private key key.pem to a DER-encoded key file key.key using OpenSSL.

  7. Convert RSA PEM to KEY OpenSSL

    • Description: Converts an RSA PEM-encoded private key to a separate KEY file format using OpenSSL.
    openssl rsa -in key.pem -out key.key

    This command converts a PEM-encoded RSA private key key.pem to a RSA private key file key.key using OpenSSL.

  8. Convert PEM file to unencrypted KEY

    • Description: Converts a PEM file to an unencrypted KEY file format using OpenSSL.
    openssl rsa -in key.pem -out key.key -passin pass: -passout pass:

    This command converts a PEM-encoded private key key.pem to an unencrypted KEY file key.key using OpenSSL, specifying empty passwords for input and output.

  9. OpenSSL convert PEM to RSA KEY

    • Description: Converts a PEM file to an RSA KEY file format using OpenSSL.
    openssl rsa -in key.pem -outform PEM -out key.key

    This command converts a PEM-encoded private key key.pem to a PEM-encoded RSA private key file key.key using OpenSSL.

  10. Convert PEM file to PKCS#1 KEY

    • Description: Converts a PEM file to a PKCS#1 KEY file format using OpenSSL.
    openssl rsa -in key.pem -outform DER -out key.key

    This command converts a PEM-encoded private key key.pem to a DER-encoded PKCS#1 key file key.key using OpenSSL.

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