diff options
author | Brian Picciano <mediocregopher@gmail.com> | 2022-09-13 12:56:08 +0200 |
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committer | Brian Picciano <mediocregopher@gmail.com> | 2022-09-13 12:56:08 +0200 |
commit | 4f01edb9230f58ff84b0dd892c931ec8ac9aad55 (patch) | |
tree | 9c1598a3f98203913ac2548883c02a81deb33dc7 /src/http/static/solvePow.js | |
parent | 5485984e05aebde22819adebfbd5ad51475a6c21 (diff) |
move src out of srv, clean up default.nix and Makefile
Diffstat (limited to 'src/http/static/solvePow.js')
-rw-r--r-- | src/http/static/solvePow.js | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/http/static/solvePow.js b/src/http/static/solvePow.js new file mode 100644 index 0000000..900400c --- /dev/null +++ b/src/http/static/solvePow.js @@ -0,0 +1,28 @@ +const fromHexString = hexString => + new Uint8Array(hexString.match(/.{1,2}/g).map(byte => parseInt(byte, 16))); + +const toHexString = bytes => + bytes.reduce((str, byte) => str + byte.toString(16).padStart(2, '0'), ''); + +onmessage = async (e) => { + const seed = fromHexString(e.data.seedHex); + const target = e.data.target; + + const fullBuf = new ArrayBuffer(seed.byteLength*2); + + const fullBufSeed = new Uint8Array(fullBuf, 0, seed.byteLength); + seed.forEach((v, i) => fullBufSeed[i] = v); + + const randBuf = new Uint8Array(fullBuf, seed.byteLength); + + while (true) { + crypto.getRandomValues(randBuf); + const digest = await crypto.subtle.digest('SHA-512', fullBuf); + const digestView = new DataView(digest); + if (digestView.getUint32(0) < target) { + postMessage(toHexString(randBuf)); + return; + } + } + +}; |