static GF_Err ISMA_Access(ISMAEAPriv *priv, GF_IPMPEvent *evt)
{
GF_Err e;
char IV[16];
if (evt->event_type==GF_IPMP_TOOL_GRANT_ACCESS) {
if (priv->state != ISMAEA_STATE_SETUP) return GF_SERVICE_ERROR;
assert(!priv->crypt);
//if (!priv->nb_allow_play) return GF_AUTHENTICATION_FAILURE;
//priv->nb_allow_play--;
/*init decrypter*/
priv->crypt = gf_crypt_open("AES-128", "CTR");
if (!priv->crypt) return GF_IO_ERR;
memset(IV, 0, sizeof(char)*16);
memcpy(IV, priv->salt, sizeof(char)*8);
e = gf_crypt_init(priv->crypt, priv->key, 16, IV);
if (e) return e;
priv->state = ISMAEA_STATE_PLAY;
return GF_OK;
}
if (evt->event_type==GF_IPMP_TOOL_RELEASE_ACCESS) {
if (priv->state != ISMAEA_STATE_PLAY) return GF_SERVICE_ERROR;
if (priv->crypt) gf_crypt_close(priv->crypt);
priv->crypt = NULL;
priv->state = ISMAEA_STATE_SETUP;
return GF_OK;
}
return GF_BAD_PARAM;
}
static GF_Err CENC_Setup(ISMAEAPriv *priv, GF_IPMPEvent *evt)
{
GF_CENCConfig *cfg = (GF_CENCConfig*)evt->config_data;
u32 i;
priv->state = ISMAEA_STATE_ERROR;
if ((cfg->scheme_type != GF_4CC('c', 'e', 'n', 'c')) && (cfg->scheme_type != GF_4CC('c','b','c','1'))) return GF_NOT_SUPPORTED;
if (cfg->scheme_version != 0x00010000) return GF_NOT_SUPPORTED;
for (i = 0; i < cfg->PSSH_count; i++) {
GF_NetComDRMConfigPSSH *pssh = &cfg->PSSHs[i];
char szSystemID[33];
u32 j;
memset(szSystemID, 0, 33);
for (j=0; j<16; j++) {
sprintf(szSystemID+j*2, "%02X", (unsigned char) pssh->SystemID[j]);
}
/*SystemID for GPAC Player: 67706163-6365-6E63-6472-6D746F6F6C31*/
if (strcmp(szSystemID, "6770616363656E6364726D746F6F6C31")) {
GF_LOG(GF_LOG_WARNING, GF_LOG_AUTHOR, ("[CENC/ISMA] System ID %s not supported\n", szSystemID));
continue;
}
else {
u8 cypherOffset;
bin128 cypherKey, cypherIV;
GF_Crypt *mc;
/*GPAC DRM TEST system info, used to validate cypher offset in CENC packager
keyIDs as usual (before private data)
URL len on 8 bits
URL
keys, cyphered with oyur magic key :)
*/
cypherOffset = pssh->private_data[0] + 1;
gf_bin128_parse("0x6770616363656E6364726D746F6F6C31", cypherKey);
gf_bin128_parse("0x00000000000000000000000000000001", cypherIV);
mc = gf_crypt_open("AES-128", "CTR");
if (!mc) {
GF_LOG(GF_LOG_ERROR, GF_LOG_AUTHOR, ("[CENC/ISMA] Cannot open AES-128 CTR\n"));
return GF_IO_ERR;
}
gf_crypt_init(mc, cypherKey, 16, cypherIV);
gf_crypt_decrypt(mc, pssh->private_data+cypherOffset, pssh->private_data_size-cypherOffset);
gf_crypt_close(mc);
/*now we search a key*/
priv->KID_count = pssh->KID_count;
if (priv->KIDs) {
gf_free(priv->KIDs);
priv->KIDs = NULL;
}
priv->KIDs = (bin128 *)gf_malloc(pssh->KID_count*sizeof(bin128));
if (priv->keys) {
gf_free(priv->keys);
priv->keys = NULL;
}
priv->keys = (bin128 *)gf_malloc(pssh->KID_count*sizeof(bin128));
memmove(priv->KIDs, pssh->KIDs, pssh->KID_count*sizeof(bin128));
memmove(priv->keys, pssh->private_data + cypherOffset, pssh->KID_count*sizeof(bin128));
}
}
if (cfg->scheme_type == GF_4CC('c', 'e', 'n', 'c'))
priv->is_cenc = GF_TRUE;
else
priv->is_cbc = GF_TRUE;
priv->state = ISMAEA_STATE_SETUP;
//priv->nb_allow_play = 1;
return GF_OK;
}
