I'm quite new using Nim .. I wanted to implement a sha512 checking routine, and made this small test script:
import nimSHA2, strutils, os
proc main(): string =
const blockSize = 8192
var bytesRead: int = 0
var buffer: string
var f: File = open(paramStr(1))
buffer = newString(blockSize)
bytesRead = f.readBuffer(buffer[0].addr, blockSize)
setLen(buffer,bytesRead)
var sha = initSHA[SHA512]()
while bytesRead > 0:
sha.update(buffer)
setLen(buffer,blockSize)
bytesRead = f.readBuffer(buffer[0].addr, blockSize)
setLen(buffer,bytesRead)
let digest = sha.final()
result = digest.hex()
when isMainModule:
echo main().toLowerAsciiThis works, until I try large files, or maybe the ones it didn't work on just happen to be large, I dont' know. Here's an example:
dana@parksoft:~/Documents/testing $ sha512sum database.db
d27a98f9aa990c691f0260c1232b91dd765054781e58da5aab610cd0bdac0931b1e40f1db1ece226bd3473eb8f5df9f5aea2647e346893388124d5b876f45889 database.db
dana@parksoft:~/Documents/testing $ ./shatest database.db
2555dadb7cab22a6b26b6d520d2425cbbb005b3c14b5c27ba100de33318fc5986fddf6a2e0816011927cbbf6385315ef521c36212f21deda637deacc233c801d
dana@parksoft:~/Documents/testing $ ls -l database.db
-rw------- 1 dana dana 2717007872 Mar 15 15:46 database.dbI don't think that there's anything wrong with the script, as it give a correct result on most other files, and if I change the SHA512 to SHA256 or SHA384, it gives a correct result no matter the size of the file.
You guys are programmers, I'm not, does anyone see anything wrong here with the script?
The nim SHA2 library has had it's last commit 4 years ago and there are unanswered bug reports from 2018.
I wouldn't put any trust in the correctness of the code in the library with current Nim versions.
Try https://nim-lang.github.io/checksums/theindex.html / https://github.com/nim-lang/checksums