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minica is a small, simple CA intended for use in situations where the CA operator also operates each host where a certificate will be used.

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Minica is a simple CA intended for use in situations where the CA operator also operates each host where a certificate will be used. It automatically generates both a key and a certificate when asked to produce a certificate. It does not offer OCSP or CRL services. Minica is appropriate, for instance, for generating certificates for RPC systems or microservices.

On first run, minica will generate a keypair and a root certificate in the current directory, and will reuse that same keypair and root certificate unless they are deleted.

On each run, minica will generate a new keypair and sign an end-entity (leaf) certificate for that keypair. The certificate will contain a list of DNS names and/or IP addresses from the command line flags. The key and certificate are placed in a new directory whose name is chosen as the first domain name from the certificate, or the first IP address if no domain names are present. It will not overwrite existing keys or certificates.

The certificate will have a validity of 2 years and 30 days.

Installation

First, install the Go tools and set up your $GOPATH. Then, run:

go install github.com/ikidou/minica@latest

When using Go 1.11 or newer you don't need a $GOPATH and can instead do the following:

cd /ANY/PATH
git clone https://github.com/ikidou/minica.git
go build
## or
# go install

Mac OS users could alternatively use Homebrew: brew install minica

Example usage

# Generate a root key and cert in minica_rootca.key, and minica_rootca.crt, then
# generate and sign an end-entity key and cert, storing them in current dir
$ minica --domains foo.com

# Wildcard
$ minica --domains '*.foo.com'

Modified

file name and extension:

  1. "{domain}/cert.pem" => "{domain}.crt"
  2. "{domain}/key.pem" => "{domain}.key"
  3. "minica.pem" => "minica_rootca.crt"
  4. "minica-key.pem" => "minica_rootca.key"

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minica is a small, simple CA intended for use in situations where the CA operator also operates each host where a certificate will be used.

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