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-Utilities
-=========
-
-A couple of useful utilities are built on top of the library.
-Each of the utilities accepts the `--help` flag, which can be used to examine
-utility's detailed usage information.
-
-Block encryption
-----------------
-
-Block encryption utilities can produce verbose human-readable output, including
-round keys, intermediate initialization vector values, etc.
-They are primarily intended for debugging purposes.
-Enable verbose output by passing the `--verbose` flag.
-Please note that verbose output can only be produced when *not* using the
-"boxes" interface (the `--use-boxes` flag).
-
-### encrypt_block
-
-Encrypts blocks using the selected algorithm in the specified mode of
-operation.
-
-For example, to encrypt
-
-* the plaintext block `0x00112233445566778899aabbccddeeff`
-* using AES-128 in ECB mode
-* with key `0x000102030405060708090a0b0c0d0e0f`,
-
-run:
-
-    encrypt_block -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:
-
-    encrypt_block -a aes192 -m ofb 000102030405060708090a0b0c0d0e0f101112131415161718 22222222222222222222222222222222 00112233445566778899aabbccddeeff
-
-### decrypt_block
-
-Decrypts blocks using the selected algorithm in the specified mode of
-operation.
-
-For example, to decrypt
-
-* the ciphertext block `0x69c4e0d86a7b0430d8cdb78070b4c55a`
-* using AES-128 in ECB mode
-* with key `0x000102030405060708090a0b0c0d0e0f`,
-
-run:
-
-    decrypt_block -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:
-
-    decrypt_block -a aes192 -m ofb 000102030405060708090a0b0c0d0e0f101112131415161718 22222222222222222222222222222222 bda298884f5c3a9eb7068aa7063a3b75
-
-File encryption
----------------
-
-### encrypt_file
-
-Encrypts a file using the selected algorithm in the specified mode of
-operation.
-
-For example, to encrypt the plaintext from "input.txt"
-
-* using AES-128 in ECB mode
-* with key `0x11111111111111111111111111111111`
-* and write the ciphertext to "output.txt",
-
-run:
-
-    encrypt_file -a aes128 -m ecb -k 11111111111111111111111111111111 -i input.txt -o output.txt
-
-To encrypt the plaintext from "input.txt"
-
-* using AES-192 in OFB mode
-* with key `0x111111111111111111111111111111111111111111111111`
-* and initialization vector `0x22222222222222222222222222222222`
-* and write the ciphertext to "output.txt":
-
-run
-
-    encrypt_file -a aes192 -m ofb -k 111111111111111111111111111111111111111111111111 -v 22222222222222222222222222222222 -i input.txt -o output.txt
-
-### decrypt_file
-
-Decrypts a file using the selected algorithm in the specified mode of
-operation.
-
-To decrypt the ciphertext from "input.txt"
-
-* using AES-128 in ECB mode
-* with key `0x11111111111111111111111111111111`
-* and write the plaintext to "output.txt",
-
-run
-
-    decrypt_file -a aes128 -m ecb -k 11111111111111111111111111111111 -i input.txt -o output.txt
-
-To decrypt the ciphertext from "input.txt"
-
-* using AES-192 in OFB mode
-* with key `0x111111111111111111111111111111111111111111111111`
-* and initialization vector `0x22222222222222222222222222222222`
-* and write the plaintext to "output.txt",
-
-run
-
-    decrypt_file -a aes192 -m ofb -k 111111111111111111111111111111111111111111111111 -v 22222222222222222222222222222222 -i input.txt -o output.txt
-
-Bitmap encryption
------------------
-
-These utilities were developed primarily to demonstrate the drawbacks of using
-ECB mode (namely, the fact that identical plaintext blocks get mapped to
-identical ciphertext blocks).
-This can be explicitly shown using 8-bit-per-pixel bitmaps:
-
-| Plaintext BMP    | Encrypted in ECB mode | Encrypted in CBC mode
-| ---------------- | --------------------- | ---------------------
-| ![butterfly.bmp] | ![cipherfly_ecb.bmp]  | ![cipherfly_cbc.bmp]
-
-[butterfly.bmp]: bmp/butterfly.bmp
-[cipherfly_ecb.bmp]: bmp/cipherfly_ecb.bmp
-[cipherfly_cbc.bmp]: bmp/cipherfly_cbc.bmp
-
-### encrypt_bmp
-
-Encrypts the pixels in a BMP image file, preserving the header.
-Otherwise, it's used the same way [encrypt_file](#encrypt_file) is.
-
-### decrypt_bmp
-
-Decrypts the pixels in a BMP image file, preserving the header.
-Otherwise, it's used the same way [decrypt_file](#decrypt_file) is.
-
-See also
---------
-
-* [Usage on older CPUs]
-* [License]
-
-[Usage on older CPUs]: ../README.md#usage-on-older-cpus
-[License]: ../README.md#license