(PHP 5 >= 5.6.0, PHP 7)
openssl_x509_fingerprint — Calculates the fingerprint, or digest, of a given X.509 certificate
openssl_x509_fingerprint ( mixed $x509 [, string $hash_algorithm = "sha1" [, bool $raw_output = false ]] ) : string
openssl_x509_fingerprint() returns the digest of x509 as a string.
x509
See Key/Certificate parameters for a list of valid values.
hash_algorithm
The digest method or hash algorithm to use, e.g. "sha256", one of openssl_get_md_methods().
raw_output
When set to true, outputs raw binary data. false outputs lowercase hexits.
Returns a string containing the calculated certificate fingerprint as lowercase hexits unless raw_output is set to true in which case the raw binary representation of the message digest is returned.
Returns false on failure.
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https://www.php.net/manual/en/function.openssl-x509-fingerprint.php