digest.time_hmac_sha512
Available inall 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 in seconds
and must be non-negative.
The offset parameter, also in seconds, provides a means for mitigating clock skew.
Base64 decoding behaves as if by a call to
digest.base64_decode.
See that function for handling invalid characters and the behavior of padding.
Unlike 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.
Example
set req.http.otp-sha-512 = digest.time_hmac_sha512(digest.base64("secret"), 60, 10);