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docs: add comments to util.go randomString #2494

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Merged
merged 3 commits into from
Jul 22, 2023
Merged

docs: add comments to util.go randomString #2494

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982dbc9
Update util.go
trim21 Jul 22, 2023
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trim21 Jul 22, 2023
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trim21 Jul 22, 2023
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6 changes: 6 additions & 0 deletions middleware/util.go
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,12 @@ func randomString(length uint8) string {
r := make([]byte, length+(length/4)) // perf: avoid read from rand.Reader many times
var i uint8 = 0

// security note:
// we can't just simply do b[i]=randomStringCharset[rb%len(randomStringCharset)],
// len(len(randomStringCharset)) is 52, and rb is [0, 255], 256 = 52 * 4 + 48.
// make the first 48 characters more possibly to be generated then others.
// So we have to skip bytes when rb > randomStringMaxByte

for {
_, err := io.ReadFull(reader, r)
if err != nil {
Expand Down