5 files changed, 71 insertions, 0 deletions
diff --git a/utils/block/cxx/CMakeLists.txt b/utils/block/cxx/CMakeLists.txt
new file mode 100644
index 0000000..8df91d0
--- /dev/null
+++ b/utils/block/cxx/CMakeLists.txt
@@ -0,0 +1,11 @@
+find_package(Boost REQUIRED COMPONENTS program_options)
+
+add_executable(util_aes_encrypt_block aes_encrypt_block.cpp aes_common.hpp)
+target_include_directories(util_aes_encrypt_block PRIVATE ${Boost_INCLUDE_DIRS})
+target_link_libraries(util_aes_encrypt_block libaesni libaesnixx ${Boost_LIBRARIES})
+set_target_properties(util_aes_encrypt_block PROPERTIES OUTPUT_NAME aes_encrypt_block)
+
+add_executable(util_aes_decrypt_block aes_decrypt_block.cpp aes_common.hpp)
+target_include_directories(util_aes_decrypt_block PRIVATE ${Boost_INCLUDE_DIRS})
+target_link_libraries(util_aes_decrypt_block libaesni libaesnixx ${Boost_LIBRARIES})
+set_target_properties(util_aes_decrypt_block PROPERTIES OUTPUT_NAME aes_decrypt_block)
diff --git a/utils/block/cxx/README.md b/utils/block/cxx/README.md
new file mode 100644
index 0000000..bce2434
--- /dev/null
+++ b/utils/block/cxx/README.md
@@ -0,0 +1,60 @@
+# Block encryption utilities
+
+Here are a couple of useful block encryption utilities built on top of the library.
+Each of the utilities accepts `--help` flag, which can be used to examine utility's usage info.
+
+On older CPUs, you can run the utilities [using Intel SDE](https://github.com/egor-tensin/aesni#running-on-older-cpus).
+
+## aes_encrypt_block.exe
+
+Encrypts 16-byte blocks using AES-128/192/256 in the specified mode of operation.
+
+### Usage examples
+
+For example, to encrypt
+
+* the plaintext block `0x00112233445566778899aabbccddeeff`
+* using AES-128 in ECB mode
+* with key `0x000102030405060708090a0b0c0d0e0f`,
+
+run:
+
+    aes_encrypt_block.exe -a aes128 -m ecb 000102030405060708090a0b0c0d0e0f 00112233445566778899aabbccddeeff
+
+To encrypt
+
+* the plaintext block `0x00112233445566778899aabbccddeeff`
+* using AES-192 in OFB mode
+* with initialization vector `0x22222222222222222222222222222222`
+* and key `0x000102030405060708090a0b0c0d0e0f101112131415161718`,
+
+run:
+
+    aes_encrypt_block.exe -a aes192 -m ofb 000102030405060708090a0b0c0d0e0f101112131415161718 22222222222222222222222222222222 00112233445566778899aabbccddeeff
+
+## aes_decrypt_block.exe
+
+Decrypts 16-byte blocks using AES-128/192/256 in the specified mode of operation.
+
+### Usage examples
+
+For example, to decrypt
+
+* the ciphertext block `0x69c4e0d86a7b0430d8cdb78070b4c55a`
+* using AES-128 in ECB mode
+* with key `0x000102030405060708090a0b0c0d0e0f`,
+
+run:
+
+    aes_decrypt_block.exe -a aes128 -m ecb 000102030405060708090a0b0c0d0e0f 69c4e0d86a7b0430d8cdb78070b4c55a
+
+To decrypt
+
+* the ciphertext block `0x762a5ab50929189cefdb99434790aad8`
+* using AES-192 in OFB mode
+* with initialization vector `0x22222222222222222222222222222222`
+* and key `0x000102030405060708090a0b0c0d0e0f101112131415161718`,
+
+run:
+
+    aes_decrypt_block.exe -a aes192 -m ofb 000102030405060708090a0b0c0d0e0f101112131415161718 22222222222222222222222222222222 bda298884f5c3a9eb7068aa7063a3b75
diff --git a/test/aes_common.hpp b/utils/block/cxx/aes_common.hpp
index 78126e5..78126e5 100644
--- a/test/aes_common.hpp
+++ b/utils/block/cxx/aes_common.hpp
diff --git a/test/aes_decrypt_block.cpp b/utils/block/cxx/aes_decrypt_block.cpp
index 9898d4e..9898d4e 100644
--- a/test/aes_decrypt_block.cpp
+++ b/utils/block/cxx/aes_decrypt_block.cpp
diff --git a/test/aes_encrypt_block.cpp b/utils/block/cxx/aes_encrypt_block.cpp
index 9458831..9458831 100644
--- a/test/aes_encrypt_block.cpp
+++ b/utils/block/cxx/aes_encrypt_block.cpp