CalculateChecksum calculates the hash checksum of the specified file.

NewUnknownHashAlgorithmError creates a new UnknownHashAlgorithmError with the specified hash algorithm name.

NumHash is the number of supported hash algorithms.

Hashes are the supported hash algorithms.

Names are the names and aliases of the supported hash algorithms.

HashChecksum consists of the hash algorithm name and the hexadecimal representation of the checksum.

UnknownHashAlgorithmError is an error indicating that the specified hash algorithm is unknown.