mirror/gmsm
1
0
Fork 0
mirror of https://github.com/emmansun/gmsm.git synced 2025-05-11 03:26:17 +08:00
Code Issues Packages Projects Releases Wiki Activity

Updated 无进位乘法和GHASH (markdown)

Sun Yimin 2023-08-21 13:16:51 +08:00
parent e03e1fc97e
commit ad9d1ba471
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
无进位乘法和GHASH.md

@ -1,5 +1,13 @@
# 概述
参考Reference 1，Page 35 - 39
* The PCLMULQDQ + AES-NI combination for AES-GCM
* AES-NI facilitate high performance AES encryption and decryption
* PCLMULQDQ ```64 x 64 -> 128 (carry-less)```
* Binary polynomial multiplication; speed up computations in binary fields
* Using it for AES-GCM:
* To use it for GHASH computations: GF(2^128) multiplication:
1. Compute ```128 x 128 -> 256``` via carry-less multiplication (of 64-bit operands)
2. Reduction: ```256 -> 128 modulo x^128 + x^7 + x^2 + x + 1``` (done efficiently via software)
# 参考
* [Cryptographic Hardware and Software and useful architectures](https://www.esat.kuleuven.be/cosic/events/ecrypt-net-school-2018/wp-content/uploads/sites/23/2018/10/kos-school-gueron-2.pdf)