The MAC algorithm used in the operation.
The algorithm must be compatible with the HMAC KMS key that you specify. To find the MAC
algorithms that your HMAC KMS key supports, use the DescribeKey operation
and see the
MacAlgorithms field in the
The message to be hashed. Specify a message of up to 4,096 bytes.
GenerateMac and VerifyMac do not provide special handling
for message digests. If you generate an HMAC for a hash digest of a message, you must verify
the HMAC of the same hash digest.