lib/crypto: aes: Add FIPS self-tests for unauthenticated modes

Upcoming changes will wire up architecture-optimized implementations of
ECB, CBC, CBC-CTS, CTR, and XTS.  FIPS labs can consider such designs to
meet the threshold for separate self-tests to be needed.

The inverse direction of the block cipher also needs to be exercised,
which the existing CMAC self-test doesn't do.

Therefore, add FIPS self-tests for encryption and decryption in these
modes as well as the "bare" AES.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260802222408.91757-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/scripts/crypto/gen-fips-testvecs.py b/scripts/crypto/gen-fips-testvecs.py
index aa6c0a81fbf8..a79eaf081c26 100755
--- a/scripts/crypto/gen-fips-testvecs.py
+++ b/scripts/crypto/gen-fips-testvecs.py
@@ -32,19 +32,67 @@ def print_header(file):
 
 def gen_aes_test_data(file):
     fips_test_data = b"fips test data\0\0"
+    fips_test_iv = b"fips test iv\0\0\0\0"
     fips_test_key = b"fips test key\0\0\0"
+    fips_test_xts_key = b"key1" + (b"\0" * 12) + b"key2" + (b"\0" * 12)
 
     print_header(file)
     print_static_u8_array_definition(file, "fips_test_data", fips_test_data)
+    print_static_u8_array_definition(file, "fips_test_iv", fips_test_iv)
     print_static_u8_array_definition(file, "fips_test_key", fips_test_key)
+    print_static_u8_array_definition(file, "fips_test_xts_key", fips_test_xts_key)
 
     aes = cryptography.hazmat.primitives.ciphers.algorithms.AES(fips_test_key)
+
+    # AES-CMAC
     aes_cmac = cryptography.hazmat.primitives.cmac.CMAC(aes)
     aes_cmac.update(fips_test_data)
     print_static_u8_array_definition(
         file, "fips_test_aes_cmac_value", aes_cmac.finalize()
     )
 
+    # AES-ECB
+    cipher = cryptography.hazmat.primitives.ciphers.Cipher(
+        aes, cryptography.hazmat.primitives.ciphers.modes.ECB()
+    )
+    encryptor = cipher.encryptor()
+    ctext = encryptor.update(fips_test_data) + encryptor.finalize()
+    print_static_u8_array_definition(file, "fips_test_aes_ecb_ctext", ctext)
+
+    # AES-CBC
+    cipher = cryptography.hazmat.primitives.ciphers.Cipher(
+        aes, cryptography.hazmat.primitives.ciphers.modes.CBC(fips_test_iv)
+    )
+    encryptor = cipher.encryptor()
+    ctext = encryptor.update(fips_test_data) + encryptor.finalize()
+    print_static_u8_array_definition(file, "fips_test_aes_cbc_ctext", ctext)
+
+    # AES-CBC-CTS
+    cipher = cryptography.hazmat.primitives.ciphers.Cipher(
+        aes, cryptography.hazmat.primitives.ciphers.modes.CBC(fips_test_iv)
+    )
+    encryptor = cipher.encryptor()
+    ctext = encryptor.update(fips_test_data * 2) + encryptor.finalize()
+    ctext = ctext[16:32] + ctext[0:16]
+    print_static_u8_array_definition(file, "fips_test_aes_cbc_cts_ctext", ctext)
+
+    # AES-CTR
+    cipher = cryptography.hazmat.primitives.ciphers.Cipher(
+        aes, cryptography.hazmat.primitives.ciphers.modes.CTR(fips_test_iv)
+    )
+    encryptor = cipher.encryptor()
+    ctext = encryptor.update(fips_test_data) + encryptor.finalize()
+    print_static_u8_array_definition(file, "fips_test_aes_ctr_ctext", ctext)
+
+    # AES-XTS
+    cipher = cryptography.hazmat.primitives.ciphers.Cipher(
+        cryptography.hazmat.primitives.ciphers.algorithms.AES(fips_test_xts_key),
+        cryptography.hazmat.primitives.ciphers.modes.XTS(fips_test_iv),
+    )
+    encryptor = cipher.encryptor()
+    ctext = encryptor.update(fips_test_data) + encryptor.finalize()
+    print_static_u8_array_definition(file, "fips_test_aes_xts_ctext", ctext)
+
 
 def gen_sha_test_data(file):
     fips_test_data = b"fips test data\0\0"