Mercurial > hg > nginx-quic
view src/core/ngx_crc.h @ 8500:ef8276c8ccff quic
QUIC: consistent use of 12-byte buffers in nonce computation.
All supported cipher suites produce 96-bit IV (RFC 5116, 5.1, RFC 8439, 2.3).
This eliminates a few magic numbers and run-time overhead.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Wed, 16 Jun 2021 17:54:21 +0300 |
parents | d620f497c50f |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_CRC_H_INCLUDED_ #define _NGX_CRC_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> /* 32-bit crc16 */ static ngx_inline uint32_t ngx_crc(u_char *data, size_t len) { uint32_t sum; for (sum = 0; len; len--) { /* * gcc 2.95.2 x86 and icc 7.1.006 compile * that operator into the single "rol" opcode, * msvc 6.0sp2 compiles it into four opcodes. */ sum = sum >> 1 | sum << 31; sum += *data++; } return sum; } #endif /* _NGX_CRC_H_INCLUDED_ */