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SYNOPSIS
#include <sys/tls.h>

string hmac(int method, string key, string arg )
string hmac(int method, string key, int * arg )

DESCRIPTION
Calculate the Hashed Message Authenication Code for <arg> based
on the digest <method> and the password <key>. Return the HMAC.

<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)

This efun is available only if the driver is compiled with
OpenSSL support.

EXAMPLES
string s;

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

HISTORY
Introduced in LDMud 3.3.714

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