Merge branch 'pymux' into hw_ecdsa_p256

1 files changed, 9 insertions, 0 deletions

diff --git a/ks_attribute.c b/ks_attribute.c
index 92e450d..ec674f5 100644
--- a/ks_attribute.c
+++ b/ks_attribute.c
@@ -120,11 +120,18 @@ hal_error_t hal_ks_attribute_delete(uint8_t *bytes, const size_t bytes_len,
   if (bytes == NULL || attributes == NULL || attributes_len == NULL || total_len == NULL)
     return HAL_ERROR_BAD_ARGUMENTS;
 
+  /*
+   * Search for attribute by type. Note that there can be only one
+   * attribute of any given type.
+   */
+
   int i = 0;
 
   while (i < *attributes_len && attributes[i].type != type)
     i++;
 
+  /* If not found, great, it's already deleted from the key. */
+
   if (i == *attributes_len)
     return HAL_OK;
 
@@ -152,6 +159,8 @@ hal_error_t hal_ks_attribute_insert(uint8_t *bytes, const size_t bytes_len,
       total_len == NULL || value == NULL)
     return HAL_ERROR_BAD_ARGUMENTS;
 
+  /* Delete the existing attribute value (if present), then write the new value. */
+
   hal_error_t err
     = hal_ks_attribute_delete(bytes, bytes_len, attributes, attributes_len, total_len, type);