Available in all subroutines.
Returns a time-based, one-time password. The password is a SHA-512 hash based
upon the current time. The
key parameter is a Base64-encoded key. The
interval parameter specifies the lifetime of the token and must be
offset parameter provides a means for mitigating clock skew.
Base64 decoding behaves as if by a call to
See that function for handling invalid characters and the behavior of padding.
digest.base64_decode, the decoded output is used directly
(rather than constructing a VCL STRING type), and so binary content
is permitted, including possible NUL bytes.
set req.http.otp-sha-512 = digest.time_hmac_sha512(digest.base64("secret"), 60, 10);