SYNOPSIS
        #include <sys/tls.h>

        string hash(int method, string arg [, int iterations ] )
        string hash(int method, int *  arg [, int iterations ] )

DESCRIPTION
        Calculate the hash from <arg> as determined by <method>. The hash is
        calculated with <iterations> iterations, default is 1 iteration.

        <method> is one of the TLS_HASH_ constants defined in tls.h; not
        all recognized methods may be supported for a given driven:

          TLS_HASH_SHA1      (1)
          TLS_HASH_SHA224    (2)
          TLS_HASH_SHA256    (3)
          TLS_HASH_SHA384    (4)
          TLS_HASH_SHA512    (5)
          TLS_HASH_MD5       (6)
          TLS_HASH_RIPEMD160 (7)

        If the driver is compiled without OpenSSL or GCrypt support
        only TLS_HASH_SHA1 and TLS_HASH_MD5 are available.

        The efun costs 10 ticks per iteration.

EXAMPLES
        string s;

        s = hash(TLS_HASH_SHA1, "Hello", 2);
        s = hash(TLS_HASH_SHA1, ({ 'H', 'e', 'l', 'l', 'o' }) )

HISTORY
        Introduced in LDMud 3.3.714
        LDMud 3.3.719 added the iteration-based evaluation cost.

SEE ALSO
        crypt(E), md5(E), md5_crypt(E), sha1(E), hmac(E)