diff --git a/tests/suites/test_suite_aria.function b/tests/suites/test_suite_aria.function
index 89de82f..d8a2971 100644
--- a/tests/suites/test_suite_aria.function
+++ b/tests/suites/test_suite_aria.function
@@ -214,7 +214,7 @@
     unsigned char dst_str[ARIA_MAX_DATA_STR];
     unsigned char output[ARIA_MAX_DATASIZE];
     mbedtls_aria_context ctx;
-    int key_len, data_len, i;
+    size_t key_len, src_str_len, i;
 
     memset( key_str, 0x00, sizeof( key_str ) );
     memset( src_str, 0x00, sizeof( src_str ) );
@@ -223,18 +223,18 @@
     mbedtls_aria_init( &ctx );
 
     key_len = mbedtls_test_unhexify( key_str, hex_key_string );
-    data_len = mbedtls_test_unhexify( src_str, hex_src_string );
+    src_str_len = mbedtls_test_unhexify( src_str, hex_src_string );
 
     TEST_ASSERT( mbedtls_aria_setkey_enc( &ctx, key_str, key_len * 8 )
                  == setkey_result );
     if( setkey_result == 0 )
     {
-        for( i = 0; i < data_len; i += MBEDTLS_ARIA_BLOCKSIZE )
+        for( i = 0; i < src_str_len; i += MBEDTLS_ARIA_BLOCKSIZE )
         {
             TEST_ASSERT( mbedtls_aria_crypt_ecb( &ctx, src_str + i, output + i )
                                                  == 0 );
         }
-        mbedtls_test_hexify( dst_str, output, data_len );
+        mbedtls_test_hexify( dst_str, output, src_str_len );
 
         TEST_ASSERT( strcasecmp( (char *) dst_str, hex_dst_string ) == 0 );
     }
@@ -253,7 +253,7 @@
     unsigned char dst_str[ARIA_MAX_DATA_STR];
     unsigned char output[ARIA_MAX_DATASIZE];
     mbedtls_aria_context ctx;
-    int key_len, data_len, i;
+    size_t key_len, src_str_len, i;
 
     memset( key_str, 0x00, sizeof( key_str ) );
     memset( src_str, 0x00, sizeof( src_str ) );
@@ -262,18 +262,18 @@
     mbedtls_aria_init( &ctx );
 
     key_len = mbedtls_test_unhexify( key_str, hex_key_string );
-    data_len = mbedtls_test_unhexify( src_str, hex_src_string );
+    src_str_len = mbedtls_test_unhexify( src_str, hex_src_string );
 
     TEST_ASSERT( mbedtls_aria_setkey_dec( &ctx, key_str, key_len * 8 )
                  == setkey_result );
     if( setkey_result == 0 )
     {
-        for( i = 0; i < data_len; i += MBEDTLS_ARIA_BLOCKSIZE )
+        for( i = 0; i < src_str_len; i += MBEDTLS_ARIA_BLOCKSIZE )
         {
             TEST_ASSERT( mbedtls_aria_crypt_ecb( &ctx, src_str + i, output + i )
                          == 0 );
         }
-        mbedtls_test_hexify( dst_str, output, data_len );
+        mbedtls_test_hexify( dst_str, output, src_str_len );
 
         TEST_ASSERT( strcasecmp( (char *) dst_str, hex_dst_string ) == 0 );
     }
@@ -294,7 +294,7 @@
     unsigned char dst_str[ARIA_MAX_DATA_STR];
     unsigned char output[ARIA_MAX_DATASIZE];
     mbedtls_aria_context ctx;
-    int key_len, data_len;
+    size_t key_len, src_str_len;
 
     memset( key_str, 0x00, sizeof( key_str ) );
     memset( iv_str, 0x00, sizeof( iv_str ) );
@@ -305,15 +305,15 @@
 
     key_len = mbedtls_test_unhexify( key_str, hex_key_string );
     mbedtls_test_unhexify( iv_str, hex_iv_string );
-    data_len = mbedtls_test_unhexify( src_str, hex_src_string );
+    src_str_len = mbedtls_test_unhexify( src_str, hex_src_string );
 
     mbedtls_aria_setkey_enc( &ctx, key_str, key_len * 8 );
-    TEST_ASSERT( mbedtls_aria_crypt_cbc( &ctx, MBEDTLS_ARIA_ENCRYPT, data_len,
+    TEST_ASSERT( mbedtls_aria_crypt_cbc( &ctx, MBEDTLS_ARIA_ENCRYPT, src_str_len,
                                          iv_str, src_str, output )
                  == cbc_result );
     if( cbc_result == 0 )
     {
-        mbedtls_test_hexify( dst_str, output, data_len );
+        mbedtls_test_hexify( dst_str, output, src_str_len );
 
         TEST_ASSERT( strcasecmp( (char *) dst_str, hex_dst_string ) == 0 );
     }
@@ -334,7 +334,7 @@
     unsigned char dst_str[ARIA_MAX_DATA_STR];
     unsigned char output[ARIA_MAX_DATASIZE];
     mbedtls_aria_context ctx;
-    int key_len, data_len;
+    size_t key_len, src_str_len;
 
     memset( key_str, 0x00, sizeof( key_str ) );
     memset( iv_str, 0x00, sizeof( iv_str ) );
@@ -345,15 +345,15 @@
 
     key_len = mbedtls_test_unhexify( key_str, hex_key_string );
     mbedtls_test_unhexify( iv_str, hex_iv_string );
-    data_len = mbedtls_test_unhexify( src_str, hex_src_string );
+    src_str_len = mbedtls_test_unhexify( src_str, hex_src_string );
 
     mbedtls_aria_setkey_dec( &ctx, key_str, key_len * 8 );
-    TEST_ASSERT( mbedtls_aria_crypt_cbc( &ctx, MBEDTLS_ARIA_DECRYPT, data_len,
+    TEST_ASSERT( mbedtls_aria_crypt_cbc( &ctx, MBEDTLS_ARIA_DECRYPT, src_str_len,
                                          iv_str, src_str, output )
                  == cbc_result );
     if( cbc_result == 0 )
     {
-        mbedtls_test_hexify( dst_str, output, data_len );
+        mbedtls_test_hexify( dst_str, output, src_str_len );
 
         TEST_ASSERT( strcasecmp( (char *) dst_str, hex_dst_string ) == 0 );
     }
@@ -375,7 +375,7 @@
     unsigned char output[ARIA_MAX_DATASIZE];
     mbedtls_aria_context ctx;
     size_t iv_offset = 0;
-    int key_len, data_len;
+    size_t key_len, src_str_len;
 
     memset( key_str, 0x00, sizeof( key_str ) );
     memset( iv_str, 0x00, sizeof( iv_str ) );
@@ -386,14 +386,14 @@
 
     key_len = mbedtls_test_unhexify( key_str, hex_key_string );
     mbedtls_test_unhexify( iv_str, hex_iv_string );
-    data_len = mbedtls_test_unhexify( src_str, hex_src_string );
+    src_str_len = mbedtls_test_unhexify( src_str, hex_src_string );
 
     mbedtls_aria_setkey_enc( &ctx, key_str, key_len * 8 );
     TEST_ASSERT( mbedtls_aria_crypt_cfb128( &ctx, MBEDTLS_ARIA_ENCRYPT,
-                                            data_len, &iv_offset, iv_str,
+                                            src_str_len, &iv_offset, iv_str,
                                             src_str, output )
                  == result );
-    mbedtls_test_hexify( dst_str, output, data_len );
+    mbedtls_test_hexify( dst_str, output, src_str_len );
 
     TEST_ASSERT( strcasecmp( (char *) dst_str, hex_dst_string ) == 0 );
 
@@ -414,7 +414,7 @@
     unsigned char output[ARIA_MAX_DATASIZE];
     mbedtls_aria_context ctx;
     size_t iv_offset = 0;
-    int key_len, data_len;
+    size_t key_len, src_str_len;
 
     memset( key_str, 0x00, sizeof( key_str ) );
     memset( iv_str, 0x00, sizeof( iv_str ) );
@@ -425,14 +425,14 @@
 
     key_len = mbedtls_test_unhexify( key_str, hex_key_string );
     mbedtls_test_unhexify( iv_str, hex_iv_string );
-    data_len = mbedtls_test_unhexify( src_str, hex_src_string );
+    src_str_len = mbedtls_test_unhexify( src_str, hex_src_string );
 
     mbedtls_aria_setkey_enc( &ctx, key_str, key_len * 8 );
     TEST_ASSERT( mbedtls_aria_crypt_cfb128( &ctx, MBEDTLS_ARIA_DECRYPT,
-                                            data_len, &iv_offset, iv_str,
+                                            src_str_len, &iv_offset, iv_str,
                                             src_str, output )
                  == result );
-    mbedtls_test_hexify( dst_str, output, data_len );
+    mbedtls_test_hexify( dst_str, output, src_str_len );
 
     TEST_ASSERT( strcasecmp( (char *) dst_str, hex_dst_string ) == 0 );
 
@@ -454,7 +454,7 @@
     unsigned char blk[MBEDTLS_ARIA_BLOCKSIZE];
     mbedtls_aria_context ctx;
     size_t iv_offset = 0;
-    int key_len, data_len;
+    size_t key_len, src_str_len;
 
     memset( key_str, 0x00, sizeof( key_str ) );
     memset( iv_str, 0x00, sizeof( iv_str ) );
@@ -465,13 +465,13 @@
 
     key_len = mbedtls_test_unhexify( key_str, hex_key_string );
     mbedtls_test_unhexify( iv_str, hex_iv_string );
-    data_len = mbedtls_test_unhexify( src_str, hex_src_string );
+    src_str_len = mbedtls_test_unhexify( src_str, hex_src_string );
 
     mbedtls_aria_setkey_enc( &ctx, key_str, key_len * 8 );
-    TEST_ASSERT( mbedtls_aria_crypt_ctr( &ctx, data_len, &iv_offset, iv_str,
+    TEST_ASSERT( mbedtls_aria_crypt_ctr( &ctx, src_str_len, &iv_offset, iv_str,
                                          blk, src_str, output )
                  == result );
-    mbedtls_test_hexify( dst_str, output, data_len );
+    mbedtls_test_hexify( dst_str, output, src_str_len );
 
     TEST_ASSERT( strcasecmp( (char *) dst_str, hex_dst_string ) == 0 );
 
@@ -493,7 +493,7 @@
     unsigned char blk[MBEDTLS_ARIA_BLOCKSIZE];
     mbedtls_aria_context ctx;
     size_t iv_offset = 0;
-    int key_len, data_len;
+    size_t key_len, src_str_len;
 
     memset( key_str, 0x00, sizeof( key_str ) );
     memset( iv_str, 0x00, sizeof( iv_str ) );
@@ -504,13 +504,13 @@
 
     key_len = mbedtls_test_unhexify( key_str, hex_key_string );
     mbedtls_test_unhexify( iv_str, hex_iv_string );
-    data_len = mbedtls_test_unhexify( src_str, hex_src_string );
+    src_str_len = mbedtls_test_unhexify( src_str, hex_src_string );
 
     mbedtls_aria_setkey_enc( &ctx, key_str, key_len * 8 );
-    TEST_ASSERT( mbedtls_aria_crypt_ctr( &ctx, data_len, &iv_offset, iv_str,
+    TEST_ASSERT( mbedtls_aria_crypt_ctr( &ctx, src_str_len, &iv_offset, iv_str,
                                          blk, src_str, output )
                  == result );
-    mbedtls_test_hexify( dst_str, output, data_len );
+    mbedtls_test_hexify( dst_str, output, src_str_len );
 
     TEST_ASSERT( strcasecmp( (char *) dst_str, hex_dst_string ) == 0 );