diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index fe73d1d..cc5532a 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -4227,10 +4227,46 @@
 }
 
 #if ( defined(MBEDTLS_ENTROPY_NV_SEED) && defined(MBEDTLS_PSA_HAS_ITS_IO) )
+
+/* Support function for error conversion between psa_its error codes to psa crypto */
+static psa_status_t its_to_psa_error( psa_its_status_t ret )
+{
+    switch( ret )
+    {
+        case PSA_ITS_SUCCESS:
+            return( PSA_SUCCESS );
+
+        case PSA_ITS_ERROR_KEY_NOT_FOUND:
+            return( PSA_ERROR_EMPTY_SLOT );
+
+        case PSA_ITS_ERROR_STORAGE_FAILURE:
+            return( PSA_ERROR_STORAGE_FAILURE );
+
+        case PSA_ITS_ERROR_INSUFFICIENT_SPACE:
+            return( PSA_ERROR_INSUFFICIENT_STORAGE );
+
+        case PSA_ITS_ERROR_INVALID_KEY:
+        case PSA_PS_ERROR_OFFSET_INVALID:
+        case PSA_ITS_ERROR_INCORRECT_SIZE:
+        case PSA_ITS_ERROR_BAD_POINTER:
+            return( PSA_ERROR_INVALID_ARGUMENT );
+
+        case PSA_ITS_ERROR_FLAGS_NOT_SUPPORTED:
+            return( PSA_ERROR_NOT_SUPPORTED );
+
+        case PSA_ITS_ERROR_WRITE_ONCE:
+            return( PSA_ERROR_OCCUPIED_SLOT );
+
+        default:
+            return( PSA_ERROR_UNKNOWN_ERROR );
+    }
+}
+
 psa_status_t mbedtls_psa_inject_entropy( const unsigned char *seed,
                                          size_t seed_size )
 {
     psa_status_t status;
+    psa_its_status_t its_status;
     struct psa_its_info_t p_info;
     if( global_data.initialized )
         return( PSA_ERROR_NOT_PERMITTED );
@@ -4240,16 +4276,20 @@
           ( seed_size > MBEDTLS_ENTROPY_MAX_SEED_SIZE ) )
             return( PSA_ERROR_INVALID_ARGUMENT );
 
-    status = psa_its_get_info( MBEDTLS_RANDOM_SEED_ITS_UID, &p_info );
-    if( PSA_ITS_ERROR_KEY_NOT_FOUND == status ) /* No seed exists */
+    its_status = psa_its_get_info( MBEDTLS_RANDOM_SEED_ITS_UID, &p_info );
+    status = its_to_psa_error( its_status );
+
+    if( PSA_ITS_ERROR_KEY_NOT_FOUND == its_status ) /* No seed exists */
     {
-        status = psa_its_set( MBEDTLS_RANDOM_SEED_ITS_UID, seed_size, seed, 0 );
+        its_status = psa_its_set( MBEDTLS_RANDOM_SEED_ITS_UID, seed_size, seed, 0 );
+        status = its_to_psa_error( its_status );
     }
-    else if( PSA_ITS_SUCCESS == status )
+    else if( PSA_ITS_SUCCESS == its_status )
     {
         /* You should not be here. Seed needs to be injected only once */
         status = PSA_ERROR_NOT_PERMITTED;
     }
+    
     return( status );
 }
 #endif
diff --git a/tests/suites/test_suite_psa_crypto_entropy.data b/tests/suites/test_suite_psa_crypto_entropy.data
index a2355d5..61593e9 100644
--- a/tests/suites/test_suite_psa_crypto_entropy.data
+++ b/tests/suites/test_suite_psa_crypto_entropy.data
@@ -1,17 +1,17 @@
 PSA validate entropy injection: good, minimum size
-validate_entropy_seed_injection:MBEDTLS_ENTROPY_BLOCK_SIZE:PSA_SUCCESS:MBEDTLS_ENTROPY_BLOCK_SIZE:PSA_ERROR_NOT_PERMITTED
+validate_entropy_seed_injection:MBEDTLS_PSA_INJECT_ENTROPY_MIN_SIZE:PSA_SUCCESS:MBEDTLS_PSA_INJECT_ENTROPY_MIN_SIZE:PSA_ERROR_NOT_PERMITTED
 
 PSA validate entropy injection: good, max size
 validate_entropy_seed_injection:MBEDTLS_ENTROPY_MAX_SEED_SIZE:PSA_SUCCESS:MBEDTLS_ENTROPY_MAX_SEED_SIZE:PSA_ERROR_NOT_PERMITTED
 
 PSA validate entropy injection: bad, too big
-validate_entropy_seed_injection:MBEDTLS_ENTROPY_MAX_SEED_SIZE+1:PSA_ERROR_INVALID_ARGUMENT:MBEDTLS_ENTROPY_BLOCK_SIZE:PSA_SUCCESS
+validate_entropy_seed_injection:MBEDTLS_ENTROPY_MAX_SEED_SIZE+1:PSA_ERROR_INVALID_ARGUMENT:MBEDTLS_PSA_INJECT_ENTROPY_MIN_SIZE:PSA_SUCCESS
 
 PSA validate entropy injection: bad, too small using MBEDTLS_ENTROPY_MIN_PLATFORM
-validate_entropy_seed_injection:MBEDTLS_ENTROPY_MIN_PLATFORM-1:PSA_ERROR_INVALID_ARGUMENT:MBEDTLS_ENTROPY_BLOCK_SIZE:PSA_SUCCESS
+validate_entropy_seed_injection:MBEDTLS_ENTROPY_MIN_PLATFORM-1:PSA_ERROR_INVALID_ARGUMENT:MBEDTLS_PSA_INJECT_ENTROPY_MIN_SIZE:PSA_SUCCESS
 
 PSA validate entropy injection: bad, too small using MBEDTLS_ENTROPY_BLOCK_SIZE
-validate_entropy_seed_injection:MBEDTLS_ENTROPY_BLOCK_SIZE-1:PSA_ERROR_INVALID_ARGUMENT:MBEDTLS_ENTROPY_BLOCK_SIZE:PSA_SUCCESS
+validate_entropy_seed_injection:MBEDTLS_ENTROPY_BLOCK_SIZE-1:PSA_ERROR_INVALID_ARGUMENT:MBEDTLS_PSA_INJECT_ENTROPY_MIN_SIZE:PSA_SUCCESS
 
 PSA validate entropy injection: before and after crypto_init
 run_entropy_inject_with_crypto_init:
diff --git a/tests/suites/test_suite_psa_crypto_entropy.function b/tests/suites/test_suite_psa_crypto_entropy.function
index 4be2c5a..2c069a9 100644
--- a/tests/suites/test_suite_psa_crypto_entropy.function
+++ b/tests/suites/test_suite_psa_crypto_entropy.function
@@ -6,6 +6,14 @@
 #include "mbedtls/entropy.h"
 #include "mbedtls/entropy_poll.h"
 
+/* MAX value support macro */
+#if !defined(MAX)
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#endif
+
+/* Calculating the minimum allowed entropy size in bytes */
+#define MBEDTLS_PSA_INJECT_ENTROPY_MIN_SIZE MAX(MBEDTLS_ENTROPY_MIN_PLATFORM, MBEDTLS_ENTROPY_BLOCK_SIZE)
+
 /* END_HEADER */
 
 /* BEGIN_DEPENDENCIES
@@ -26,7 +34,7 @@
     uint8_t *seed = NULL;
     int i;
     int seed_size;
-    if( seed_length_a > seed_length_b)
+    if( seed_length_a > seed_length_b )
     {
         seed_size = seed_length_a;
     }
@@ -35,23 +43,25 @@
         seed_size = seed_length_b;
     }
     ASSERT_ALLOC( seed, seed_size );
-    /* fill seed in some data */
-    for( i = 0; i < seed_size; ++i)
+    /* fill seed with some data */
+    for( i = 0; i < seed_size; ++i )
     {
         seed[i] = i;
     }
-    its_status =  psa_its_remove(MBEDTLS_RANDOM_SEED_ITS_UID);
-    TEST_ASSERT( (its_status == PSA_ITS_SUCCESS) || (its_status == PSA_ITS_ERROR_KEY_NOT_FOUND) );
+    its_status =  psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
+    TEST_ASSERT( ( its_status == PSA_ITS_SUCCESS ) ||
+                 ( its_status == PSA_ITS_ERROR_KEY_NOT_FOUND ) );
     status = mbedtls_psa_inject_entropy( seed, seed_length_a );
     TEST_ASSERT( status == expected_status_a );
     status = mbedtls_psa_inject_entropy( seed, seed_length_b );
     TEST_ASSERT( status == expected_status_b );
     TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );
-    TEST_ASSERT( psa_generate_random( output, sizeof( output ) ) == PSA_SUCCESS );
-    TEST_ASSERT( memcmp( output , zeros, sizeof( output ) ) != 0 );
+    TEST_ASSERT( psa_generate_random( output,
+                                      sizeof( output ) ) == PSA_SUCCESS );
+    TEST_ASSERT( memcmp( output, zeros, sizeof( output ) ) != 0 );
 exit:
     mbedtls_free( seed );
-    psa_its_remove(MBEDTLS_RANDOM_SEED_ITS_UID);
+    psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
     mbedtls_psa_crypto_free( );
 }
 /* END_CASE */
@@ -62,27 +72,31 @@
     psa_its_status_t its_status;
     psa_status_t status;
     int i;
-    uint8_t seed[MBEDTLS_ENTROPY_BLOCK_SIZE] = {0};
-    /* fill seed in some data */
-    for( i = 0; i < MBEDTLS_ENTROPY_BLOCK_SIZE; ++i)
+    uint8_t seed[MBEDTLS_PSA_INJECT_ENTROPY_MIN_SIZE] = { 0 };
+    /* fill seed with some data */
+    for( i = 0; i < sizeof( seed ); ++i )
     {
         seed[i] = i;
     }
-    its_status =  psa_its_remove(MBEDTLS_RANDOM_SEED_ITS_UID);
-    TEST_ASSERT( (its_status == PSA_ITS_SUCCESS) || (its_status == PSA_ITS_ERROR_KEY_NOT_FOUND) );
-    status = mbedtls_psa_inject_entropy( seed, MBEDTLS_ENTROPY_BLOCK_SIZE );
+    its_status =  psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
+    TEST_ASSERT( ( its_status == PSA_ITS_SUCCESS ) ||
+                 ( its_status == PSA_ITS_ERROR_KEY_NOT_FOUND ) );
+    status = mbedtls_psa_inject_entropy( seed, sizeof( seed ) );
     TEST_ASSERT( status == PSA_SUCCESS );
-    its_status =  psa_its_remove(MBEDTLS_RANDOM_SEED_ITS_UID);
+    its_status =  psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
     TEST_ASSERT( its_status == PSA_ITS_SUCCESS );
-    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );
-    status = mbedtls_psa_inject_entropy( seed, MBEDTLS_ENTROPY_BLOCK_SIZE );
-    TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );
+    status = psa_crypto_init( );
+    TEST_ASSERT( status == PSA_ERROR_INSUFFICIENT_ENTROPY );
+    status = mbedtls_psa_inject_entropy( seed, sizeof( seed ) );
+    TEST_ASSERT( status == PSA_SUCCESS );
+    status = psa_crypto_init( );
+    TEST_ASSERT( status == PSA_SUCCESS );
     mbedtls_psa_crypto_free( );
     /* The seed is written by nv_seed callback functions therefore the injection will fail */
-    status = mbedtls_psa_inject_entropy( seed, MBEDTLS_ENTROPY_BLOCK_SIZE );
+    status = mbedtls_psa_inject_entropy( seed, sizeof( seed ) );
     TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );
 exit:
-    psa_its_remove(MBEDTLS_RANDOM_SEED_ITS_UID);
+    psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
     mbedtls_psa_crypto_free( );
 }
 /* END_CASE */