STACK * gens = NULL;
STACK_OF(GENERAL_NAME) * gens = NULL;
static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,	     X509V3_CTX *ctx, STACK *values){char keyid=0, issuer=0;int i;CONF_VALUE *cnf;ASN1_OCTET_STRING *ikeyid = NULL;X509_NAME *isname = NULL;STACK * gens = NULL;GENERAL_NAME *gen = NULL;ASN1_INTEGER *serial = NULL;X509_EXTENSION *ext;X509 *cert;AUTHORITY_KEYID *akeyid;for(i = 0; i < sk_num(values); i++) {	cnf = (CONF_VALUE *)sk_value(values, i);	if(!strcmp(cnf->name, "keyid")) {		keyid = 1;		if(cnf->value && !strcmp(cnf->value, "always")) keyid = 2;	} else if(!strcmp(cnf->name, "issuer")) {		issuer = 1;		if(cnf->value && !strcmp(cnf->value, "always")) issuer = 2;	} else {		X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,X509V3_R_UNKNOWN_OPTION);		ERR_add_error_data(2, "name=", cnf->name);		return NULL;	}}if(!ctx || !ctx->issuer_cert) {	if(ctx && (ctx->flags==CTX_TEST)) return AUTHORITY_KEYID_new();	X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,X509V3_R_NO_ISSUER_CERTIFICATE);	return NULL;}cert = ctx->issuer_cert;if(keyid) {	i = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);	if((i >= 0)  && (ext = X509_get_ext(cert, i)))			ikeyid = (ASN1_OCTET_STRING *) X509V3_EXT_d2i(ext);	if(keyid==2 && !ikeyid) {		X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);		return NULL;	}}if((issuer && !ikeyid) || (issuer == 2)) {	isname = X509_NAME_dup(X509_get_issuer_name(cert));	serial = ASN1_INTEGER_dup(X509_get_serialNumber(cert));	if(!isname || !serial) {		X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);		goto err;	}}if(!(akeyid = AUTHORITY_KEYID_new())) goto err;if(isname) {	if(!(gens = sk_new(NULL)) || !(gen = GENERAL_NAME_new())		|| !sk_push(gens, (char *)gen)) {		X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,ERR_R_MALLOC_FAILURE);		goto err;	}	gen->type = GEN_DIRNAME;	gen->d.dirn = isname;}akeyid->issuer = gens;akeyid->serial = serial;akeyid->keyid = ikeyid;return akeyid;err:X509_NAME_free(isname);ASN1_INTEGER_free(serial);ASN1_OCTET_STRING_free(ikeyid);return NULL;}