tools: binman: Add tests for FIT with data encrypted by mkimage

Test the property 'fit,encrypt' to encrypt FIT data.

Signed-off-by: Paul HENRYS <paul.henrys_ext@softathome.com>

tools/binman/ftest.py

@@ -7900,5 +7900,50 @@ fdt         fdtmap                Extract the devicetree blob from the fdtmap
             extra_indirs=[test_subdir])[0]
 
 
+    def testSimpleFitEncryptedData(self):
+        """Test an image with a FIT containing data to be encrypted"""
+        data = tools.read_file(self.TestFile("aes256.bin"))
+        self._MakeInputFile("keys/aes256.bin", data)
+
+        keys_subdir = os.path.join(self._indir, "keys")
+        data = self._DoReadFileDtb(
+            '343_fit_encrypt_data.dts',
+            extra_indirs=[keys_subdir])[0]
+
+        fit = fdt.Fdt.FromData(data)
+        fit.Scan()
+
+        # Extract the encrypted data and the Initialization Vector from the FIT
+        node = fit.GetNode('/images/u-boot')
+        subnode = fit.GetNode('/images/u-boot/cipher')
+        data_size_unciphered = int.from_bytes(fit.GetProps(node)['data-size-unciphered'].bytes,
+                                              byteorder='big')
+        self.assertEqual(data_size_unciphered, len(U_BOOT_NODTB_DATA))
+
+        # Retrieve the key name from the FIT removing any null byte
+        key_name = fit.GetProps(subnode)['key-name-hint'].bytes.replace(b'\x00', b'')
+        with open(self.TestFile(key_name.decode('ascii') + '.bin'), 'rb') as file:
+            key = file.read()
+        iv = fit.GetProps(subnode)['iv'].bytes.hex()
+        enc_data = fit.GetProps(node)['data'].bytes
+        outdir = tools.get_output_dir()
+        enc_data_file = os.path.join(outdir, 'encrypted_data.bin')
+        tools.write_file(enc_data_file, enc_data)
+        data_file = os.path.join(outdir, 'data.bin')
+
+        # Decrypt the encrypted data from the FIT and compare the data
+        tools.run('openssl', 'enc', '-aes-256-cbc', '-nosalt', '-d', '-in',
+                  enc_data_file, '-out', data_file, '-K', key.hex(), '-iv', iv)
+        with open(data_file, 'r') as file:
+            dec_data = file.read()
+        self.assertEqual(U_BOOT_NODTB_DATA, dec_data.encode('ascii'))
+
+    def testSimpleFitEncryptedDataMissingKey(self):
+        """Test an image with a FIT containing data to be encrypted but with a missing key"""
+        with self.assertRaises(ValueError) as e:
+            self._DoReadFile('344_fit_encrypt_data_no_key.dts')
+
+        self.assertIn("Filename 'aes256.bin' not found in input path", str(e.exception))
+
 if __name__ == "__main__":
     unittest.main()

tools/binman/test/343_fit_encrypt_data.dts

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		fit {
+			fit,encrypt;
+			description = "Test a FIT with encrypted data";
+			#address-cells = <1>;
+
+			images {
+				u-boot {
+					description = "U-Boot";
+					type = "firmware";
+					arch = "arm64";
+					os = "U-Boot";
+					compression = "none";
+					load = <00000000>;
+					entry = <00000000>;
+					cipher {
+						algo = "aes256";
+						key-name-hint = "aes256";
+					};
+					u-boot-nodtb {
+					};
+				};
+				fdt-1 {
+					description = "Flattened Device Tree blob";
+					type = "flat_dt";
+					arch = "arm64";
+					compression = "none";
+					cipher {
+						algo = "aes256";
+						key-name-hint = "aes256";
+					};
+				};
+			};
+
+			configurations {
+				default = "conf-1";
+				conf-1 {
+					description = "Boot U-Boot with FDT blob";
+					firmware = "u-boot";
+					fdt = "fdt-1";
+				};
+			};
+		};
+	};
+};

tools/binman/test/344_fit_encrypt_data_no_key.dts

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		fit {
+			fit,encrypt;
+			description = "Test a FIT with encrypted data";
+			#address-cells = <1>;
+
+			images {
+				u-boot {
+					description = "U-Boot";
+					type = "firmware";
+					arch = "arm64";
+					os = "U-Boot";
+					compression = "none";
+					load = <00000000>;
+					entry = <00000000>;
+					cipher {
+						algo = "aes256";
+						key-name-hint = "aes256";
+					};
+					u-boot-nodtb {
+					};
+				};
+				fdt-1 {
+					description = "Flattened Device Tree blob";
+					type = "flat_dt";
+					arch = "arm64";
+					compression = "none";
+					cipher {
+						algo = "aes256";
+						key-name-hint = "aes256";
+					};
+				};
+			};
+
+			configurations {
+				default = "conf-1";
+				conf-1 {
+					description = "Boot U-Boot with FDT blob";
+					firmware = "u-boot";
+					fdt = "fdt-1";
+				};
+			};
+		};
+	};
+};

tools/binman/test/aes256.bin

@@ -0,0 +1 @@
+1234567890abcdefghijklmnopqrstuv