openssl_x509_fingerprint(3) php man page | unix.com

OPENSSL_X509_FINGERPRINT(3)						 1					       OPENSSL_X509_FINGERPRINT(3)

openssl_x509_fingerprint - Calculates the fingerprint, or digest, of a given X.509 certificate

SYNOPSIS
       bool openssl_x509_fingerprint FALSE (mixed  $x509, [string  $hash_algorithm = "sha1"], [bool  $raw_output])

DESCRIPTION
       openssl_x509_fingerprint(3) returns the digest of $x509 as a string.

PARAMETERS
	      o $x509
		- See Key/Certificate parameters for a list of valid values.

	      o $hash_algorithm
		- The hash algorithm to use, e.g. "md5" or "sha1"

	      o $raw_output
		- When set to TRUE, outputs raw binary data.  FALSE outputs lowercase hexits.

RETURN VALUES
	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.

PHP Documentation Group 											       OPENSSL_X509_FINGERPRINT(3)