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from waflib import Options

def parse_version(v):
    return tuple(map(int, (v.split("."))))

gnutls_min_required_version = "3.4.7"

gnutls_required_version = gnutls_min_required_version

conf.CHECK_CFG(package='gnutls',
               args=('"gnutls >= %s" --cflags --libs' % gnutls_required_version),
                     msg='Checking for GnuTLS >= %s' % gnutls_required_version,
                     mandatory=True)

gnutls_version = conf.cmd_and_log(conf.env.PKGCONFIG + ['--modversion', 'gnutls']).strip()

# Define gnutls as a system library
conf.SET_TARGET_TYPE('gnutls', 'SYSLIB')

# Check for gnutls_pkcs7_get_embedded_data_oid (>= 3.5.5) required by libmscat
conf.CHECK_FUNCS_IN('gnutls_pkcs7_get_embedded_data_oid', 'gnutls')

# Check for gnutls_set_default_priority_append (>= 3.6.3)
conf.CHECK_FUNCS_IN('gnutls_set_default_priority_append', 'gnutls')

# Check for gnutls_aead_cipher_encryptv2
#
# This is available since version 3.6.10, but 3.6.10 has a bug which got fixed
# in 3.6.11, see:
#
#     https://gitlab.com/gnutls/gnutls/-/merge_requests/1085
if (parse_version('3.6.10') != parse_version(gnutls_version)):
    conf.CHECK_FUNCS_IN('gnutls_aead_cipher_encryptv2', 'gnutls')

# Check if we have support for crypto policies
if conf.CHECK_FUNCS_IN('gnutls_get_system_config_file', 'gnutls'):
    conf.DEFINE('HAVE_GNUTLS_CRYPTO_POLICIES', 1)

if conf.CHECK_VALUEOF('GNUTLS_CIPHER_AES_128_CFB8', headers='gnutls/gnutls.h'):
    conf.DEFINE('HAVE_GNUTLS_AES_CFB8', 1)
else:
    Logs.warn('No gnutls support for AES CFB8')

if conf.CHECK_VALUEOF('GNUTLS_MAC_AES_CMAC_128', headers='gnutls/gnutls.h'):
    conf.DEFINE('HAVE_GNUTLS_AES_CMAC', 1)
else:
    Logs.warn('No gnutls support for AES CMAC')