Headline
CVE-2021-4238: Remove unnecessary checks on a value that is already definitely an al… · Masterminds/goutils@869801f
Randomly-generated alphanumeric strings contain significantly less entropy than expected. The RandomAlphaNumeric and CryptoRandomAlphaNumeric functions always return strings containing at least one digit from 0 to 9. This significantly reduces the amount of entropy in short strings generated by these functions.
@@ -21,7 +21,6 @@ import (
“fmt”
“math”
“math/big”
“regexp”
“unicode”
)
@@ -102,24 +101,8 @@ func CryptoRandomAlphaNumeric(count int) (string, error) {
if count == 0 {
return "", nil
}
RandomString, err := CryptoRandom(count, 0, 0, true, true)
if err != nil {
return "", fmt.Errorf("Error: %s", err)
}
match, err := regexp.MatchString("([0-9]+)", RandomString)
if err != nil {
panic(err)
}
if !match {
//Get the position between 0 and the length of the string-1 to insert a random number
position := getCryptoRandomInt(count)
//Insert a random number between [0-9] in the position
RandomString = RandomString[:position] + string(‘0’ + getCryptoRandomInt(10)) + RandomString[position + 1:]
return RandomString, err
}
return RandomString, err
return CryptoRandom(count, 0, 0, true, true)
}
/*
@@ -204,7 +187,7 @@ func CryptoRandom(count int, start int, end int, letters bool, numbers bool, cha
if chars == nil {
ch = rune(getCryptoRandomInt(gap) + int64(start))
} else {
ch = chars[getCryptoRandomInt(gap) + int64(start)]
ch = chars[getCryptoRandomInt(gap)+int64(start)]
}
if letters && unicode.IsLetter(ch) || numbers && unicode.IsDigit(ch) || !letters && !numbers {
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Randomly-generated alphanumeric strings contain significantly less entropy than expected. The `RandomAlphaNumeric` and `CryptoRandomAlphaNumeric` functions always return strings containing at least one digit from 0 to 9. This significantly reduces the amount of entropy in short strings generated by these functions.