Solaris dev/random

Question

Hallo，

哪個算法實現了Solaris的dev/random？是Yarrow-160還是Yarrow-256？還是算法與Linux相同？是否有文檔/鏈接？我已經看了很多，但我找不到它。提前致謝。

Answer 1

此鏈接可能會有所幫助：Solaris /dev/random

Answer 2

也許OpenSolaris源代碼，特別是/src/uts/common/crypto/io/swrand.c，有一些線索：

/* 
* Software based random number provider for the Kernel Cryptographic 
* Framework (KCF). This provider periodically collects unpredictable input 
* from external sources and processes it into a pool of entropy (randomness) 
* in order to satisfy requests for random bits from kCF. It implements 
* software-based mixing, extraction, and generation algorithms. 
* 
* A history note: The software-based algorithms in this file used to be 
* part of the /dev/random driver. 
*/ 

略讀該文件：該PRNG與從啓動高分辨率時間初始化，當前的TOD和物理內存狀態和值由重複的SHA1哈希與附加的熵池混合（在yarrow規範中的「攪動」）產生。 SHA1是160位。

也是從那個文件的相關性：

#define MINEXTRACTBITS  160 /* Min entropy level for extraction */ 

從這個簡析Solaris的/dev/random看起來像一個亞羅-160執行。