2 files changed, 7 insertions, 0 deletions
diff --git a/test/cavp.py b/test/cavp.py
index 86486ed..42998d9 100755
--- a/test/cavp.py
+++ b/test/cavp.py
@@ -5,6 +5,10 @@
 # For details, see https://github.com/egor-tensin/aes-tools.
 # Distributed under the MIT License.
 
+# This uses the CAVP (Cryptographic Algorithm Validation Program) "Known Answer
+# Test Vectors". The .zip archive can be downloaded from the program's page:
+# https://csrc.nist.gov/projects/cryptographic-algorithm-validation-program/block-ciphers#AES
+
 import argparse
 from collections import OrderedDict
 from collections.abc import MutableSequence
diff --git a/test/nist.py b/test/nist.py
index 274cbbc..d9b0477 100755
--- a/test/nist.py
+++ b/test/nist.py
@@ -13,6 +13,9 @@ import sys
 
 from toolkit import Algorithm, BlockInput, Mode, Tools
 
+# The data is from "Example Vectors for Modes of Operation of the AES":
+# https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf
+
 _TEST_PLAINTEXTS = [
     "6bc1bee22e409f96e93d7e117393172a",
     "ae2d8a571e03ac9c9eb76fac45af8e51",