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Add a table summarizing the differences between the variants
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jedisct1 committed Dec 8, 2024
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Expand Up @@ -79,6 +79,19 @@ Include `<aegis.h>` and call `aegis_init()` prior to doing anything else with th

[Other AEGIS implementations](https://github.com/cfrg/draft-irtf-cfrg-aegis-aead?tab=readme-ov-file#known-implementations) are also available for most programming languages.

## Key differences between AEGIS variants

| **Feature** | **AEGIS-128L** | **AEGIS-256** | **AEGIS-128X2** | **AEGIS-128X4** | **AEGIS-256X2** | **AEGIS-256X4** |
| -------------------- | --------------------------------------------------------------------- | -------------------------------------------- | ---------------------------------- | ---------------------------------- | --------------------------------- | --------------------------------- |
| **Key Length** | 128 bits | 256 bits | 128 bits | 128 bits | 256 bits | 256 bits |
| **Nonce Length** | 128 bits | 256 bits | 128 bits | 128 bits | 256 bits | 256 bits |
| **State Size** | 1024 bits (8 x 128-bit blocks) | 768 bits (6 x 128-bit blocks) | 2048 bits (2 x 1024-bit states) | 4096 bits (4 x 1024-bit states) | 1536 bits (2 x 768-bit states) | 3072 bits (4 x 768-bit states) |
| **Input Rate** | 256 bits per update | 128 bits per update | 512 bits per update | 1024 bits per update | 256 bits per update | 512 bits per update |
| **Parallelism** | None | None | 2 parallel lanes | 4 parallel lanes | 2 parallel lanes | 4 parallel lanes |
| **Performance** | High on standard CPUs | High on standard CPUs | Higher on CPUs with AVX2 | Higher on CPUs with AVX-512 | Higher on CPUs with AVX2 | Higher on CPUs with AVX-512 |
| **Security Level** | 128-bit security | 256-bit security | 128-bit security | 128-bit security | 256-bit security | 256-bit security |
| **Special Features** | Optimized for high performance on standard CPUs with AES instructions | Optimized for high security with larger keys | Parallelized version of AEGIS-128L | Parallelized version of AEGIS-128L | Parallelized version of AEGIS-256 | Parallelized version of AEGIS-256 |

## Benchmark results

AEGIS is very fast on CPUs with parallel execution pipelines and AES support.
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