Extract SHA-256 Certificate Fingerprint from hostname or certificate (.crt, .der or .pem) file

Related tags

Security & Decompiler certificate-fingerprint-extractor
Overview

Certificate Fingerprint Extractor

This tool extract SHA-256 Certificate Fingerprint from hostname or certificate (.crt, .der or .pem) file.

In order to implement Certificate Pinning during an SSL connection, a certificate fingerprint needs to be provided.

Usage examples:

   $ peer-certificate-extractor -n, --hostname <hostname> (e.g., google.com, facebook.com)

or

   $ peer-certificate-extractor -c, --certificate <certificate> (e.g., cert.der, cert.crt, cert.pem)

Example output:

  Fingerprints from google.com certificates:
  sha256/We74o5ME3USRtL6+B2UhXnwY9FR91QPJMYDtUNk6tEc=
  sha256/zCTnfLwLKbS9S2sbp+uFz4KZOocFvXxkV06Ce9O5M2w=
  sha256/hxqRlPTu1bMS/0DITB1SSu0vd4u/8l8TjPgfaAp63Gc=

Certificate Pinning with OkHttp

Enabling okhttp certificate pinning (Example in Kotlin):

  ...
  val certificatePinner = CertificatePinner.Builder()
    .add("google.com", "sha256/We74o5ME3USRtL6+B2UhXnwY9FR91QPJMYDtUNk6tEc=")
    .add("google.com", "sha256/zCTnfLwLKbS9S2sbp+uFz4KZOocFvXxkV06Ce9O5M2w=")
    .add("google.com", "sha256/hxqRlPTu1bMS/0DITB1SSu0vd4u/8l8TjPgfaAp63Gc=")
    .build()
    
  val client = OkHttpClient.Builder()
    .certificatePinner(certificatePinner)
    .build()
  ...
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