The manual is not constistent at this point. On one hand, it describes the return as digest/fingerprint of a cert, on the other hand it says:
bool openssl_x509_fingerprint( … )
On PHP 5.6.5, I only get the bool return (1 or 0).
(PHP 5.6, PHP 7)
openssl_x509_fingerprint — Calculates the fingerprint, or digest, of a given X.509 certificate
$x509
[, string $hash_algorithm = "sha1"
[, bool $raw_output = FALSE
]] )
openssl_x509_fingerprint() returns the digest of
x509 as a string.
x509See Key/Certificate parameters for a list of valid values.
hash_algorithmThe hash algorithm to use, e.g. "md5" or "sha1"
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.
The manual is not constistent at this point. On one hand, it describes the return as digest/fingerprint of a cert, on the other hand it says:
bool openssl_x509_fingerprint( … )
On PHP 5.6.5, I only get the bool return (1 or 0).