add pk_oid_cmp_with_asn1()

src/headers/tomcrypt_private.h

@@ -303,6 +303,8 @@ int x509_decode_subject_public_key_info(const unsigned char *in, unsigned long i
         unsigned int algorithm, void* public_key, unsigned long* public_key_len,
         ltc_asn1_type parameters_type, ltc_asn1_list* parameters, unsigned long *parameters_len);
 
+int pk_oid_cmp_with_asn1(const char *o1, const ltc_asn1_list *o2);
+
 #endif /* LTC_DER */
 
 /* tomcrypt_pkcs.h */

src/pk/asn1/oid/pk_oid_asn1.c

@@ -0,0 +1,43 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+#include "tomcrypt_private.h"
+
+#ifdef LTC_DER
+
+/*
+   Compare an OID string to an OID element decoded from ASN.1.
+   @return CRYPT_OK if equal
+*/
+int pk_oid_cmp_with_asn1(const char *o1, const ltc_asn1_list *o2)
+{
+   unsigned long i;
+   char tmp[256] = { 0 };
+   int err;
+
+   if (o1 == NULL || o2 == NULL) return CRYPT_ERROR;
+
+   if (o2->type != LTC_ASN1_OBJECT_IDENTIFIER) return CRYPT_INVALID_ARG;
+
+   i = sizeof(tmp);
+   if ((err = pk_oid_num_to_str(o2->data, o2->size, tmp, &i)) != CRYPT_OK) {
+      return err;
+   }
+
+   if (XSTRCMP(o1, tmp) != 0) {
+      return CRYPT_PK_INVALID_TYPE;
+   }
+
+   return CRYPT_OK;
+}
+
+#endif
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */