Availability::- use_module(library(sha)).(can be autoloaded)
sha_hash(+Data,
-Hash, +Options)Hash is the SHA hash of Data. Data is either an atom, packed
string or list of character codes. Hash is unified with a
list of bytes (integers in the range 0..255) representing the hash. See
hash_atom/2
to convert this into the more commonly seen hexadecimal representation.
The conversion is controlled by Options:
- algorithm(+Algorithm)
- One of
sha1 (default), sha224, sha256,
sha384 or sha512
- encoding(+Encoding)
- This option defines the mapping from Prolog (Unicode) text to bytes on
which the SHA algorithm is performed. It has two values. The defualt is
utf8,
which implies that Unicode text is encoded as UTF-8 bytes. This option
can deal with any atom. The alternative is
octet, which implies that the text is considered as a
sequence of bytes. This is suitable for e.g., atoms that represent
binary data. An error is raised if the text contains code-points outside
the range 0..255.