Open Source

`step certificate fingerprint`

Name

step certificate fingerprint -- print the fingerprint of a certificate

Usage

step certificate fingerprint <crt-file>
[--bundle] [--roots=<root-bundle>] [--servername=<servername>] 
[--format=<format>] [--sha1] [--insecure]

Description

step certificate fingerprint reads a certificate and prints to STDOUT the certificate SHA256 of the raw certificate.

If crt-file contains multiple certificates (i.e., it is a certificate "bundle") the fingerprint of the first certificate in the bundle will be printed. Pass the --bundle option to print all fingerprints in the order in which they appear in the bundle.

Positional arguments

crt-file A certificate PEM file, usually the root certificate.

Options

--roots=roots Root certificate(s) that will be used to verify the authenticity of the remote server.

roots is a case-sensitive string and may be one of:

file: Relative or full path to a file. All certificates in the file will be used for path validation.

list of files: Comma-separated list of relative or full file paths. Every PEM encoded certificate from each file will be used for path validation.

directory: Relative or full path to a directory. Every PEM encoded certificate from each file in the directory will be used for path validation.

--bundle Print all fingerprints in the order in which they appear in the bundle.

--insecure Use an insecure client to retrieve a remote peer certificate. Useful for debugging invalid certificates remotely.

--servername=value TLS Server Name Indication that should be sent to request a specific certificate from the server.

--format=format The format of the fingerprint, it must be "hex", "base64", "base64-url", "base64-raw", "base64-url-raw" or "emoji".

--sha1 Use the SHA-1 hash algorithm to hash the certificate. Requires --insecure flag.

Examples

Get the fingerprint for a root certificate:

$ step certificate fingerprint /path/to/root_ca.crt
0d7d3834cf187726cf331c40a31aa7ef6b29ba4df601416c9788f6ee01058cf3

Get the fingerprint for a remote certificate:

$ step certificate fingerprint https://smallstep.com
e2c4f12edfc1816cc610755d32e6f45d5678ba21ecda1693bb5b246e3c48c03d

Get the fingerprints for a remote certificate with its intermediate:

$ step certificate fingerprint --bundle https://smallstep.com
e2c4f12edfc1816cc610755d32e6f45d5678ba21ecda1693bb5b246e3c48c03d
25847d668eb4f04fdd40b12b6b0740c567da7d024308eb6c2c96fe41d9de218d