diff --git a/features/mbedtls/targets/TARGET_NUVOTON/TARGET_M480/sha/sha_alt_hw.c b/features/mbedtls/targets/TARGET_NUVOTON/TARGET_M480/sha/sha_alt_hw.c
index d5e93cc5af..81d16bfdd7 100644
--- a/features/mbedtls/targets/TARGET_NUVOTON/TARGET_M480/sha/sha_alt_hw.c
+++ b/features/mbedtls/targets/TARGET_NUVOTON/TARGET_M480/sha/sha_alt_hw.c
@@ -24,6 +24,7 @@
 
 #include "nu_bitutil.h"
 #include "mbed_assert.h"
+#include "mbed_error.h"
 #include "crypto-misc.h"
 
 #include <string.h>
@@ -416,6 +417,10 @@ void crypto_sha_update_nobuf(crypto_sha_context *ctx, const unsigned char *input
 
 void crypto_sha_getinternstate(unsigned char output[], size_t olen)
 {
+    if (olen & 0x3) {
+        error("Internal error in SHA alter. SHA internal state size requires to be a multiple of 4 bytes.");
+    }
+    
     uint32_t *in_pos = (uint32_t *) &CRPT->HMAC_DGST[0];
     unsigned char *out_pos = output;
     uint32_t rmn = olen;
diff --git a/features/mbedtls/targets/TARGET_NUVOTON/TARGET_NUC472/sha/sha_alt_hw.c b/features/mbedtls/targets/TARGET_NUVOTON/TARGET_NUC472/sha/sha_alt_hw.c
index 2a7c52f025..b09a9c34e5 100644
--- a/features/mbedtls/targets/TARGET_NUVOTON/TARGET_NUC472/sha/sha_alt_hw.c
+++ b/features/mbedtls/targets/TARGET_NUVOTON/TARGET_NUC472/sha/sha_alt_hw.c
@@ -24,6 +24,7 @@
 
 #include "nu_bitutil.h"
 #include "mbed_assert.h"
+#include "mbed_error.h"
 #include "crypto-misc.h"
 
 #include <string.h>
@@ -312,6 +313,10 @@ void crypto_sha_update_nobuf(crypto_sha_context *ctx, const unsigned char *input
 
 void crypto_sha_getinternstate(unsigned char output[], size_t olen)
 {
+    if (olen & 0x3) {
+        error("Internal error in SHA alter. SHA internal state size requires to be a multiple of 4 bytes.");
+    }
+    
     uint32_t *in_pos = (uint32_t *) &CRPT->SHA_DGST0;
     unsigned char *out_pos = output;
     uint32_t rmn = olen;