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Some crypto related scripts

Last updated: 19.08.2026

Contents

createOpensslCert

Creates .der and .pem ssl keys and certificates in one command, i.e. public key, private key, certificate, pfx.

Requirements
Requires an openssl.exe found in the %PATH% or %ProgramFiles%\Git\usr\bin\openssl.exe.

Remarks
It is not possible to create a .pfx file directly from a .der file. To achieve this, a .pem certificate and a private key are temporarily created in /d mode in order to generate the .pfx file.

Usage

$ createOpensslCert.bat /n <name> [/rsa|/ed25519] [/b <bits>] [/subj ^<value^>] [/pass ^<value^>|/nopass] [/d] [/c] [/t] [/h]

Options:

  • /n : Base name of the files.
  • /rsa : Create rsa key pair.
  • /ed25519, /ec : Create ed25519 key pair (default).
  • /b : Bits for RSA. Default: 4096.
  • /crt : Create self signed certificate out of the keys.
    • /subj : Subject for certificate, e.g. "/CN=bla". Default: /CN=^<name^>.
  • /pfx : Create pfx out of the priv key and cert.
    • /pass : Password for pfx. Suppresses prompt.
    • /nopass : No password for pfx. Suppresses prompt.
  • /d, /der : Create .der formatted files. Default is .pem.
  • /c : Convert the created files to other type (pem=>der, der=>pem)
  • /t : Check the created files.
  • /h : Print this.

sha256sum

Calculate sha256 of file.
Wrapper for certutil -hashfile <filename> sha256

Usage

$ sha256sum.bat <file> [/h]

Options:

  • file The file path to sha256.
  • /h Print help info.