openssl ed25519 fix#134
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May 13, 2026
PHP 8.4 added native Ed25519 support to the OpenSSL extension, but openssl_get_curve_names() never returns 'ed25519' — so the previous detection only ever found the Sodium path. The correct signal is the presence of the OPENSSL_KEYTYPE_ED25519 constant (PHP >= 8.4). Also fixes the actual verify call for Ed25519 keys: openssl_verify() requires algorithm 0 (no extra hash) for EdDSA, not OPENSSL_ALGO_SHA256. The key type is determined via openssl_pkey_get_details(). README updated to mention the OpenSSL Ed25519 path. Includes a 'lenght' → 'length' comment typo fix. Adopted from upstream PR lbuchs/WebAuthn#134 by @henrikalves.
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PHP 8.4 added ed25519 support in OpenSSL:
https://www.php.net/manual/en/migration84.new-features.php#migration84.new-features.openssl
openssl_get_curve_names()does not returned25519, so the previous curve-based check did not work.I changed the detection to check if
OPENSSL_KEYTYPE_ED25519is defined instead.There was also an issue in the verify logic: for Ed25519,
openssl_verify()must use algorithm0, notOPENSSL_ALGO_SHA256.At the moment, I am using
openssl_pkey_get_details()to determine the key type. I am not sure whether there is a better way to detect this without callingopenssl_pkey_get_details(), but this works for now.