Block Cipher "Magma" (GOST R 34.12-2015, former GOST 28147-89)

Supported Cipher Modes

• ECB - Electronic Codebook Mode
• CTR - Counter Encryption Mode
• CTR-ACPKM - Counter Encryption Mode as per RFC8645
• OFB - Output Feedback Mode
• CBC - Cipher Block Chaining Mode
• CFB - Cipher Feedback Mode
• MAC - Message Authentication Code Generation Mode

Implemented and tested according to specifications

• RFC 8891 a.k.a GOST R 34.12-2015: Block Cipher "Magma"
• RFC 5830 a.k.a GOST 28147-89
• Block Cipher Modes:
  • GOST R 34.13-2015
  • CTR-ACPKM, Р 1323565.1.017—2018

Tests are implemented using: crypto_vectors

Tested on platforms

1. Linux Ubuntu 22.04 LTS / Intel® Core™ i7
2. MacOS Ventura 13.4 / Apple Macbook Pro M1

Usage

Please look at magma_samples

Samples

• Block encryption encrypt_block.rs
• Text encryption encrypt_text.rs
• Message Authentication Code (MAC) calculate_mac.rs
• Buffer encryption encrypt_buffer.rs
• Buffer encryption by parallel processing encryptbufferparallel.rs
• File encryption encrypt_file.rs
• Bitmap file encryption encrypt_bmp.rs

Bitmap file encryption results

The original bitmap image: Ferris the crab

Encrypted bitmap in Electronic Codebook Mode (ECB) Mode

Please note that ECB has weaknesses. It does not hide data patterns well and leaks information about the plaintext. ECB mode is not recommended for use in cryptographic protocols.

Encrypted bitmap in Counter Encryption (CTR) Mode

Encrypted bitmap in Output Feedback (OFB) Mode

Encrypted bitmap in Cipher Block Chaining (CBC) Mode

Encrypted bitmap in Cipher Feedback (CFB) Mode