diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index 1a2a741..f8b8cea 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -601,6 +601,17 @@
 /** \brief Retrieve the lifetime of a key slot.
  *
  * The assignment of lifetimes to slots is implementation-dependent.
+ *
+ * \param key           Slot to query.
+ * \param lifetime      On success, the lifetime value.
+ *
+ * \retval PSA_SUCCESS
+ *         Success.
+ * \retval PSA_ERROR_INVALID_ARGUMENT
+ *         The key slot is invalid.
+ * \retval PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval PSA_ERROR_HARDWARE_FAILURE
+ * \retval PSA_ERROR_TAMPERING_DETECTED
  */
 psa_status_t psa_get_key_lifetime(psa_key_slot_t key,
                                   psa_key_lifetime_t *lifetime);
@@ -610,9 +621,27 @@
  * Whether the lifetime of a key slot can be changed at all, and if so
  * whether the lifetime of an occupied key slot can be changed, is
  * implementation-dependent.
+ *
+ * \param key           Slot whose lifetime is to be changed.
+ * \param lifetime      The lifetime value to set for the given key slot.
+ *
+ * \retval PSA_SUCCESS
+ *         Success.
+ * \retval PSA_ERROR_INVALID_ARGUMENT
+ *         The key slot is invalid,
+ *         or the lifetime value is invalid.
+ * \retval PSA_ERROR_NOT_SUPPORTED
+ *         The implementation does not support the specified lifetime value,
+ *         at least for the specified key slot.
+ * \retval PSA_ERROR_OCCUPIED_SLOT
+ *         The slot contains a key, and the implementation does not support
+ *         changing the lifetime of an occupied slot.
+ * \retval PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval PSA_ERROR_HARDWARE_FAILURE
+ * \retval PSA_ERROR_TAMPERING_DETECTED
  */
 psa_status_t psa_set_key_lifetime(psa_key_slot_t key,
-                                  const psa_key_lifetime_t *lifetime);
+                                  psa_key_lifetime_t lifetime);
 
 /**@}*/
 
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 483e1a6..7e633a3 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -97,6 +97,7 @@
 typedef struct {
     psa_key_type_t type;
     psa_key_policy_t policy;
+    psa_key_lifetime_t lifetime;
     union {
         struct raw_data {
             uint8_t *data;
@@ -1288,6 +1289,7 @@
 }
 
 
+
 /****************************************************************/
 /* Key Policy */
 /****************************************************************/
@@ -1352,6 +1354,54 @@
     return( PSA_SUCCESS );
 }
 
+
+
+/****************************************************************/
+/* Key Lifetime */
+/****************************************************************/
+
+psa_status_t psa_get_key_lifetime(psa_key_slot_t key,
+                                  psa_key_lifetime_t *lifetime)
+{
+    key_slot_t *slot;
+
+    if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT )
+        return( PSA_ERROR_INVALID_ARGUMENT );
+
+    slot = &global_data.key_slots[key];
+    
+    *lifetime = slot->lifetime;
+
+    return( PSA_SUCCESS );
+}
+
+psa_status_t psa_set_key_lifetime(psa_key_slot_t key,
+                                  const psa_key_lifetime_t lifetime)
+{
+    key_slot_t *slot;
+
+    if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT )
+        return( PSA_ERROR_INVALID_ARGUMENT );
+
+    if( lifetime != PSA_KEY_LIFETIME_VOLATILE && 
+        lifetime != PSA_KEY_LIFETIME_PERSISTENT && 
+        lifetime != PSA_KEY_LIFETIME_WRITE_ONCE)
+        return( PSA_ERROR_INVALID_ARGUMENT );
+
+    slot = &global_data.key_slots[key];
+    if( slot->type != PSA_KEY_TYPE_NONE )
+        return( PSA_ERROR_OCCUPIED_SLOT );
+
+    if ( lifetime != PSA_KEY_LIFETIME_VOLATILE )
+        return( PSA_ERROR_NOT_SUPPORTED );
+        
+    slot->lifetime = lifetime;
+
+    return( PSA_SUCCESS );
+}
+
+
+
 /****************************************************************/
 /* Module setup */
 /****************************************************************/
diff --git a/tests/suites/test_suite_psa_crypto.data b/tests/suites/test_suite_psa_crypto.data
index 326f9fb..38f4b80 100644
--- a/tests/suites/test_suite_psa_crypto.data
+++ b/tests/suites/test_suite_psa_crypto.data
@@ -92,3 +92,15 @@
 
 PSA Key Policy enforcement - sign
 key_policy_fail:PSA_KEY_USAGE_SIGN:PSA_ALG_RSA_PKCS1V15_SIGN_RAW:PSA_ERROR_NOT_PERMITTED:"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"
+
+PSA Key Lifetime set and get volatile
+key_lifetime:PSA_KEY_LIFETIME_VOLATILE
+
+PSA Key Lifetime set fail, invalid key slot
+key_lifetime_set_fail:0:PSA_KEY_LIFETIME_VOLATILE:PSA_ERROR_INVALID_ARGUMENT
+
+PSA Key Lifetime set fail, can not change write_once lifetime
+key_lifetime_set_fail:1:PSA_KEY_LIFETIME_WRITE_ONCE:PSA_ERROR_NOT_SUPPORTED
+
+PSA Key Lifetime set fail, invalid key lifetime value
+key_lifetime_set_fail:1:PSA_KEY_LIFETIME_PERSISTENT+1:PSA_ERROR_INVALID_ARGUMENT
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index ae5401a..de388db 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -401,6 +401,7 @@
     psa_key_policy_t policy_set = {0};
     psa_key_policy_t policy_get = {0};
         
+
     memset( key, 0x2a, sizeof( key ) );
  
     TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );
@@ -424,6 +425,9 @@
     TEST_ASSERT( policy_get.usage == policy_set.usage );
     TEST_ASSERT( policy_get.alg == policy_set.alg );
 
+    
+
+
 exit:
     psa_destroy_key( key_slot );
     mbedtls_psa_crypto_free( );
@@ -476,3 +480,49 @@
     mbedtls_psa_crypto_free( );
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void key_lifetime( int lifetime_arg )
+{
+    int key_slot = 1;
+    psa_key_type_t key_type = PSA_ALG_CBC_BASE;
+    unsigned char key[32] = {0};
+    psa_key_lifetime_t lifetime_set = (psa_key_lifetime_t) lifetime_arg;
+    psa_key_lifetime_t lifetime_get;
+    memset( key, 0x2a, sizeof( key ) );
+    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );
+    TEST_ASSERT( psa_set_key_lifetime( key_slot, 
+                                 lifetime_set ) == PSA_SUCCESS );
+    TEST_ASSERT( psa_import_key( key_slot, key_type,
+                                 key, sizeof( key ) ) == PSA_SUCCESS );
+    TEST_ASSERT( psa_get_key_lifetime( key_slot, 
+                                 &lifetime_get ) == PSA_SUCCESS );
+    TEST_ASSERT( lifetime_get == lifetime_set ); 
+exit:
+    psa_destroy_key( key_slot );
+    mbedtls_psa_crypto_free( );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void key_lifetime_set_fail( int key_slot_arg, int lifetime_arg, int expected_status_arg )
+{
+    int key_slot = 1;
+    psa_key_lifetime_t lifetime_set = (psa_key_lifetime_t) lifetime_arg;
+    psa_status_t actual_status;
+    psa_status_t expected_status = expected_status_arg;
+
+    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );
+
+    actual_status = psa_set_key_lifetime( key_slot_arg, lifetime_set );
+
+    if( actual_status == PSA_SUCCESS )
+        actual_status = psa_set_key_lifetime( key_slot_arg, lifetime_set );
+    
+    TEST_ASSERT( expected_status == actual_status );
+
+exit:
+    psa_destroy_key( key_slot );
+    mbedtls_psa_crypto_free( );
+}
+/* END_CASE */