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diff --git a/utils/README.md b/utils/README.md new file mode 100644 index 0000000..ec23774 --- /dev/null +++ b/utils/README.md @@ -0,0 +1,87 @@ +# Utilities + +Here are a couple of useful utilities built on top of the library. +Each of the utilities accepts `--help` flag, which can be used to examine utility's usage info. + +The included utilities are: + +* [file encryption](#file-encryption) utilities, +* and [bitmap encryption](#bitmap-encryption) utilities. + +On older CPUs, you can run the utilities [using Intel SDE](https://github.com/egor-tensin/aesni#running-on-older-cpus). + +## File encryption + +### aes_encrypt_file.exe + +Encrypts a file using AES-128/192/256 in the specified mode of operation. + +#### Usage examples + +For example, to encrypt the plaintext `input.txt` + +* using AES-128 in ECB mode +* with key `0x11111111111111111111111111111111` +* and write the ciphertext to `output.txt`, + +run: + + aes_encrypt_file.exe -a aes128 -m ecb 11111111111111111111111111111111 input.txt 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 + + aes_encrypt_file.exe -a aes192 -m ofb 111111111111111111111111111111111111111111111111 22222222222222222222222222222222 input.txt output.txt + +### aes_decrypt_file.exe + +Decrypts a file using AES-128/192/256 in the specified mode of operation. + +#### Usage examples + +To decrypt the ciphertext from `input.txt` + +* using AES-128 in ECB mode +* with key `0x11111111111111111111111111111111` +* and write the plaintext to `output.txt`, + +run + + aes_decrypt_file.exe -a aes128 -m ecb 11111111111111111111111111111111 input.txt 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 + + aes_decrypt_file.exe -a aes192 -m ofb 111111111111111111111111111111111111111111111111 22222222222222222222222222222222 input.txt 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 +------------- | --------------------- | --------------------- + |  |  + +### aes_encrypt_bmp.exe + +Encrypts the pixels in a BMP image file, preserving the header. +The usage is the same as for [aes_encrypt_file.exe](#aes_encrypt_fileexe). + +### aes_decrypt_bmp.exe + +Decrypts the pixels in a BMP image file, preserving the header. +The usage is the same as for [aes_decrypt_file.exe](#aes_decrypt_fileexe). diff --git a/utils/bmp/butterfly.bmp b/utils/bmp/butterfly.bmp Binary files differnew file mode 100644 index 0000000..105a55a --- /dev/null +++ b/utils/bmp/butterfly.bmp diff --git a/utils/bmp/cipherfly_cbc.bmp b/utils/bmp/cipherfly_cbc.bmp Binary files differnew file mode 100644 index 0000000..664b557 --- /dev/null +++ b/utils/bmp/cipherfly_cbc.bmp diff --git a/utils/bmp/cipherfly_ecb.bmp b/utils/bmp/cipherfly_ecb.bmp Binary files differnew file mode 100644 index 0000000..78de9a8 --- /dev/null +++ b/utils/bmp/cipherfly_ecb.bmp |
