---
name: "py3rsa-priv2pub"
section: "1"
platform: "linux"
package: "python3-rsa"
version: "4.9-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/py3rsa-priv2pub"
---

# py3rsa-priv2pub(1)

read a private key and output the corresponding public key

## NAME

**py3rsa-priv2pub** - read a private key and output the corresponding public key

## SYNOPSIS

**py3rsa-priv2pub** \[*OPTION*\]...

## DESCRIPTION

Read a private key and output the corresponding public key. Both private and public key use the format described in PKCS#1 v1.5

## OPTIONS

- **-h**, **--help**

  show help message and exit

- **-i** *INFILENAME*, **--input=***INFILENAME*

  input filename. Read from stdin if not specified

- **-i** *OUTFILENAME*, **--output=***OUTFILENAME*

  output filename. write to stdout of not specified

- **--inform=***INFORM*

  key format of input - default PEM

- **--outform=***OUTFORM*

  key format of output - default PEM

## AUTHOR

**py3rsa-priv2pub** was written by Sybren A. Stuvel \<sybren AT stuvel.eu\>.