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tools/security/random.go
59 строк
2 KB
Gani Georgiev
upgraded to math/rand/v2
19 дек 2025, 20:08
19 дек 2025, 20:08
4abc018
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package security import ( cryptoRand "crypto/rand" "math/big" mathRand "math/rand/v2" ) const defaultRandomAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" // RandomString generates a cryptographically random string with the specified length. // // The generated string matches [A-Za-z0-9]+ and it's transparent to URL-encoding. func RandomString(length int) string { return RandomStringWithAlphabet(length, defaultRandomAlphabet) } // RandomStringWithAlphabet generates a cryptographically random string // with the specified length and characters set. // // It panics if for some reason rand.Int returns a non-nil error. func RandomStringWithAlphabet(length int, alphabet string) string { b := make([]byte, length) max := big.NewInt(int64(len(alphabet))) for i := range b { n, err := cryptoRand.Int(cryptoRand.Reader, max) if err != nil { panic(err) } b[i] = alphabet[n.Int64()] } return string(b) } // PseudorandomString generates a pseudorandom string with the specified length. // // The generated string matches [A-Za-z0-9]+ and it's transparent to URL-encoding. // // For a cryptographically random string (but a little bit slower) use RandomString instead. func PseudorandomString(length int) string { return PseudorandomStringWithAlphabet(length, defaultRandomAlphabet) } // PseudorandomStringWithAlphabet generates a pseudorandom string // with the specified length and characters set. // // For a cryptographically random (but a little bit slower) use RandomStringWithAlphabet instead. func PseudorandomStringWithAlphabet(length int, alphabet string) string { b := make([]byte, length) max := len(alphabet) for i := range b { b[i] = alphabet[mathRand.IntN(max)] } return string(b) }