ocsp: search CA by key hash instead of ext key id

Author: rizlik

src/ssl.c

@@ -5102,6 +5102,36 @@ Signer* GetCA(void* vp, byte* hash)
     return ret;
 }
 
+#if defined(HAVE_OCSP)
+Signer* GetCAByKeyHash(void* vp, const byte* keyHash)
+{
+    WOLFSSL_CERT_MANAGER* cm = (WOLFSSL_CERT_MANAGER*)vp;
+    Signer* ret = NULL;
+    Signer* signers;
+    int row;
+
+    if (cm == NULL || keyHash == NULL)
+        return NULL;
+
+    if (wc_LockMutex(&cm->caLock) != 0)
+        return NULL;
+
+    /* Unfortunately we need to look through the entire table */
+    for (row = 0; row < CA_TABLE_SIZE && ret == NULL; row++) {
+        for (signers = cm->caTable[row]; signers != NULL;
+                signers = signers->next) {
+            if (XMEMCMP(signers->subjectKeyHash, keyHash, KEYID_SIZE)
+                    == 0) {
+                ret = signers;
+                break;
+            }
+        }
+    }
+
+    wc_UnLockMutex(&cm->caLock);
+    return ret;
+}
+#endif
 #ifdef WOLFSSL_AKID_NAME
 Signer* GetCAByAKID(void* vp, const byte* issuer, word32 issuerSz,
         const byte* serial, word32 serialSz)

wolfcrypt/src/asn.c

@@ -36770,7 +36770,7 @@ static int DecodeBasicOcspResponse(byte* source, word32* ioIndex,
         int sigValid = -1;
 
         #ifndef NO_SKID
-            ca = GetCA(cm, resp->single->issuerKeyHash);
+            ca = GetCAByKeyHash(cm, resp->single->issuerKeyHash);
         #else
             ca = GetCA(cm, resp->single->issuerHash);
         #endif
@@ -36911,7 +36911,7 @@ static int DecodeBasicOcspResponse(byte* source, word32* ioIndex,
 
         /* Response didn't have a certificate - lookup CA. */
     #ifndef NO_SKID
-        ca = GetCA(cm, resp->single->issuerKeyHash);
+        ca = GetCAByKeyHash(cm, resp->single->issuerKeyHash);
     #else
         ca = GetCA(cm, resp->single->issuerHash);
     #endif

wolfssl/internal.h

@@ -6460,6 +6460,9 @@ WOLFSSL_LOCAL WC_RNG* WOLFSSL_RSA_GetRNG(WOLFSSL_RSA *rsa, WC_RNG **tmpRNG,
         WOLFSSL_LOCAL Signer* GetCAByAKID(void* vp, const byte* issuer,
                 word32 issuerSz, const byte* serial, word32 serialSz);
     #endif
+    #ifdef HAVE_OCSP
+        WOLFSSL_LOCAL Signer* GetCAByKeyHash(void* vp, const byte* keyHash);
+    #endif
     #if !defined(NO_SKID) && !defined(GetCAByName)
         WOLFSSL_LOCAL Signer* GetCAByName(void* cm, byte* hash);
     #endif