efun::hmac()

SYNOPSIS¶

#include <tls.h>¶

string hmac ( int method, string key, string value )

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

Calculate the Hashed Message Authenication Code for value 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)

If the driver is compiled without OpenSSL or GCrypt support an error is thrown.

The example below shows how to compute the SHA1 hmac of a string and an array of characters:

string s;

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