[gnutls-devel] Supported MAC algorithms
jaak.ristioja at cyber.ee
Tue Dec 22 11:12:47 CET 2015
On 22.12.2015 11:35, Nikos Mavrogiannopoulos wrote:
> On Mon, 2015-12-21 at 14:50 +0200, Jaak Ristioja wrote:
>> The table of supported HMAC algorithms in the GnuTLS manual only
>> MAC_MD5, MAC_SHA1, MAC_SHA256 and MAC_AEAD, whereas the enum
>> gnutls_mac_algorithm_t in gnutls.h also lists GNUTLS_MAC_SHA384,
>> GNUTLS_MAC_SHA512, GNUTLS_MAC_SHA224 etc. Are these HMAC algorithms
>> really not supported or is the documentation incorrect?
> Hi Jaak,
> This table lists the algorithms supported in the TLS protocol. SHA224
> and SHA512 are not supported. SHA384 is supported by some ciphersuites
> and is indeed missing.
>> The GnuTLS documentation doesn't clearly state whether the HMAC
>> implementations in GnuTLS are based on RFC 2104?
> Why would that matter? This section describes the algorithms used in
> TLS, so it should be apparent that the HMAC construction used is the
> one referenced by TLS. If that's not sufficient, please suggest some
I think it is confusing that subsection "8.3 Hash and HMAC functions"
which refers to the Table 3.2 of the supported HMAC algorithms with is
under section "8 Using GnuTLS as a cryptographic library" which I think
is rather TLS-agnostic. I think subsection 8.3 should have a separate
table listing all the algorithms supported by GnuTLS as a cryptographic
library, whereas the description of Table 3.2 should state "Supported
MAC algorithms in the TLS record layer" and the second paragraph under
3.3.1 should also be corrected accordingly.
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