util-decode-der: decode GeneralizedTime

Decode ASN.1 element type GeneralizedTime in DER-encoded
structures.

src/util-decode-der.c

@@ -88,6 +88,9 @@ static Asn1Generic * DecodeAsn1DerT61String(const unsigned char *buffer,
 static Asn1Generic * DecodeAsn1DerUTCTime(const unsigned char *buffer,
                                           uint32_t size, uint8_t depth,
                                           uint32_t *errcode);
+static Asn1Generic * DecodeAsn1DerGeneralizedTime(const unsigned char *buffer,
+                                                  uint32_t size, uint8_t depth,
+                                                  uint32_t *errcode);
 
 static Asn1Generic * Asn1GenericNew(void)
 {
@@ -220,6 +223,9 @@ static Asn1Generic * DecodeAsn1DerGeneric(const unsigned char *buffer,
         case ASN1_UTCTIME:
             child = DecodeAsn1DerUTCTime(d_ptr, el_max_size, depth+1, errcode);
             break;
+        case ASN1_GENERALIZEDTIME:
+            child = DecodeAsn1DerGeneralizedTime(d_ptr, el_max_size, depth+1, errcode);
+            break;
         default:
             /* unknown ASN.1 type */
             child = NULL;
@@ -862,6 +868,20 @@ static Asn1Generic * DecodeAsn1DerUTCTime(const unsigned char *buffer,
     return a;
 }
 
+static Asn1Generic * DecodeAsn1DerGeneralizedTime(const unsigned char *buffer,
+                                                  uint32_t max_size,
+                                                  uint8_t depth,
+                                                  uint32_t *errcode)
+{
+    Asn1Generic *a;
+
+    a = DecodeAsn1DerIA5String(buffer, max_size, depth, errcode);
+    if (a != NULL)
+        a->type = ASN1_GENERALIZEDTIME;
+
+    return a;
+}
+
 Asn1Generic * DecodeDer(const unsigned char *buffer, uint32_t size,
                         uint32_t *errcode)
 {

src/util-decode-der.h

@@ -54,6 +54,7 @@
 #define ASN1_T61STRING       0x14
 #define ASN1_IA5STRING       0x16
 #define ASN1_UTCTIME         0x17
+#define ASN1_GENERALIZEDTIME 0x18
 
 typedef struct Asn1ElementType_ {
 	uint8_t cls:2;