diff --git a/ctaocrypt/src/asn.c b/ctaocrypt/src/asn.c
index d12a47a86..c2b40b5ba 100644
--- a/ctaocrypt/src/asn.c
+++ b/ctaocrypt/src/asn.c
@@ -63,6 +63,16 @@ enum {
 #endif
 
 
+#ifndef min
+
+    static INLINE word32 min(word32 a, word32 b)
+    {
+        return a > b ? b : a;
+    }
+
+#endif /* min */
+
+
 #ifdef THREADX
     /* uses parital <time.h> structures */
     #define XTIME(tl)  (0)
@@ -2710,7 +2720,7 @@ static int SetMyVersion(word32 version, byte* output, int header)
     }
     output[i++] = ASN_INTEGER;
     output[i++] = 0x01;
-    output[i++] = version;
+    output[i++] = (byte)version;
 
     return i;
 }
@@ -3183,8 +3193,6 @@ static const char* GetOneName(CertName* name, int idx)
     default:
        return 0;
     }
-
-    return 0;
 }
 
 
@@ -3220,8 +3228,6 @@ static byte GetNameId(int idx)
     default:
        return 0;
     }
-
-    return 0;
 }
 
 
@@ -3508,7 +3514,8 @@ static int WriteCertBody(DerCert* der, byte* buffer)
     idx += der->publicKeySz;
     if (der->extensionsSz) {
         /* extensions */
-        XMEMCPY(buffer + idx, der->extensions, der->extensionsSz);
+        XMEMCPY(buffer + idx, der->extensions, min(der->extensionsSz,
+                                                   sizeof(der->extensions)));
         idx += der->extensionsSz;
     }
 
diff --git a/ctaocrypt/src/coding.c b/ctaocrypt/src/coding.c
index f72a56467..63edc6a66 100644
--- a/ctaocrypt/src/coding.c
+++ b/ctaocrypt/src/coding.c
@@ -54,6 +54,7 @@ int Base64_Decode(const byte* in, word32 inLen, byte* out, word32* outLen)
     word32 i = 0;
     word32 j = 0;
     word32 plainSz = inLen - ((inLen + (PEM_LINE_SZ - 1)) / PEM_LINE_SZ );
+    const byte maxIdx = (byte)sizeof(base64Decode) + 0x2B - 1;
 
     plainSz = (plainSz * 3 + 3) / 4;
     if (plainSz > *outLen) return BAD_FUNC_ARG;
@@ -75,6 +76,16 @@ int Base64_Decode(const byte* in, word32 inLen, byte* out, word32* outLen)
         if (e4 == PAD)
             pad4 = 1;
 
+        if (e1 < 0x2B || e2 < 0x2B || e3 < 0x2B || e4 < 0x2B) {
+            CYASSL_MSG("Bad Base64 Decode data, too small");
+            return ASN_INPUT_E;
+        }
+
+        if (e1 > maxIdx || e2 > maxIdx || e3 > maxIdx || e4 > maxIdx) {
+            CYASSL_MSG("Bad Base64 Decode data, too big");
+            return ASN_INPUT_E;
+        }
+
         e1 = base64Decode[e1 - 0x2B];
         e2 = base64Decode[e2 - 0x2B];
         e3 = (e3 == PAD) ? 0 : base64Decode[e3 - 0x2B];
diff --git a/ctaocrypt/src/integer.c b/ctaocrypt/src/integer.c
index 996dad062..72f443ffc 100644
--- a/ctaocrypt/src/integer.c
+++ b/ctaocrypt/src/integer.c
@@ -2762,6 +2762,9 @@ int fast_s_mp_sqr (mp_int * a, mp_int * b)
     }
   }
 
+  if (pa > MP_WARRAY)
+    return MP_RANGE;  /* TAO range check */
+
 #ifdef CYASSL_SMALL_STACK
   W = (mp_digit*)XMALLOC(sizeof(mp_digit) * MP_WARRAY, 0, DYNAMIC_TYPE_BIGINT);
   if (W == NULL)    
@@ -2878,6 +2881,8 @@ int fast_s_mp_mul_digs (mp_int * a, mp_int * b, mp_int * c, int digs)
 
   /* number of output digits to produce */
   pa = MIN(digs, a->used + b->used);
+  if (pa > MP_WARRAY)
+    return MP_RANGE;  /* TAO range check */
 
 #ifdef CYASSL_SMALL_STACK
   W = (mp_digit*)XMALLOC(sizeof(mp_digit) * MP_WARRAY, 0, DYNAMIC_TYPE_BIGINT);
@@ -3598,6 +3603,9 @@ int fast_s_mp_mul_high_digs (mp_int * a, mp_int * b, mp_int * c, int digs)
     }
   }
 
+  if (pa > MP_WARRAY)
+    return MP_RANGE;  /* TAO range check */
+  
 #ifdef CYASSL_SMALL_STACK
   W = (mp_digit*)XMALLOC(sizeof(mp_digit) * MP_WARRAY, 0, DYNAMIC_TYPE_BIGINT);
   if (W == NULL)    
diff --git a/src/internal.c b/src/internal.c
index 4e807f1bd..27157dae7 100644
--- a/src/internal.c
+++ b/src/internal.c
@@ -2822,7 +2822,7 @@ static int BuildMessage(CYASSL* ssl, byte* output, const byte* input, int inSz,
 
     /* write to output */
     if (ivSz) {
-        XMEMCPY(output + idx, iv, ivSz);
+        XMEMCPY(output + idx, iv, min(ivSz, sizeof(iv)));
         idx += ivSz;
     }
     XMEMCPY(output + idx, input, inSz);
@@ -4235,7 +4235,7 @@ int SetCipherList(Suites* s, const char* list)
         i += RAN_LEN;
         b = input[i++];
         if (b) {
-            XMEMCPY(ssl->arrays.sessionID, input + i, b);
+            XMEMCPY(ssl->arrays.sessionID, input + i, min(b, ID_LEN));
             i += b;
             ssl->options.haveSessionId = 1;
         }
@@ -4506,7 +4506,7 @@ int SetCipherList(Suites* s, const char* list)
                 encSigSz = EncodeSignature(encodedSig, digest, digestSz, typeH);
 
                 if (encSigSz != (word32)ret || XMEMCMP(out, encodedSig,
-                                                       encSigSz) != 0)
+                                        min(encSigSz, MAX_ENCODED_SIG_SZ)) != 0)
                     return VERIFY_SIGN_ERROR;
             }
             else { 
@@ -4673,7 +4673,7 @@ int SetCipherList(Suites* s, const char* list)
 
             /* precede export with 1 byte length */
             ret = ecc_export_x963(&myKey, encSecret + 1, &size);
-            encSecret[0] = size;
+            encSecret[0] = (byte)size;
             encSz = size + 1;
 
             if (ret != 0)
@@ -6139,12 +6139,13 @@ int SetCipherList(Suites* s, const char* list)
 
                 sigSz = EncodeSignature(encodedSig, digest, digestSz, typeH);
 
-                if (outLen == (int)sigSz && XMEMCMP(out, encodedSig,sigSz) == 0)
+                if (outLen == (int)sigSz && XMEMCMP(out, encodedSig,
+                                           min(sigSz, MAX_ENCODED_SIG_SZ)) == 0)
                     ret = 0;  /* verified */
             }
             else {
                 if (outLen == sizeof(ssl->certHashes) && XMEMCMP(out,
-                             ssl->certHashes.md5, sizeof(ssl->certHashes)) == 0)
+                                &ssl->certHashes, sizeof(ssl->certHashes)) == 0)
                     ret = 0;  /* verified */
             }
         }
diff --git a/src/tls.c b/src/tls.c
index dfeab8147..447f0d819 100644
--- a/src/tls.c
+++ b/src/tls.c
@@ -33,6 +33,16 @@
 #ifndef NO_TLS
 
 
+#ifndef min
+
+    static INLINE word32 min(word32 a, word32 b)
+    {
+        return a > b ? b : a;
+    }
+
+#endif /* min */
+
+
 /* calculate XOR for TLSv1 PRF */
 static INLINE void get_xor(byte *digest, word32 digLen, byte* md5, byte* sha)
 {
@@ -74,7 +84,7 @@ static void p_hash(byte* result, word32 resLen, const byte* secret,
         HmacFinal(&hmac, current);
 
         if ( (i == lastTime) && lastLen)
-            XMEMCPY(&result[idx], current, lastLen);
+            XMEMCPY(&result[idx], current, min(lastLen, sizeof(current)));
         else {
             XMEMCPY(&result[idx], current, len);
             idx += len;