91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
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package password
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import (
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"crypto/rand"
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"crypto/subtle"
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"encoding/base64"
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"errors"
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"fmt"
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"strconv"
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"strings"
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"golang.org/x/crypto/argon2"
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)
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const (
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memory = 64 * 1024
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iterations = 3
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parallelism = 2
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saltLength = 16
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keyLength = 32
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)
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func Hash(value string) (string, error) {
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if len(value) < 12 {
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return "", errors.New("password must contain at least 12 characters")
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}
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return hash(value)
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}
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// HashDemo hashes intentionally weak, local-only seed credentials.
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func HashDemo(value string) (string, error) {
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if value == "" {
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return "", errors.New("demo password is empty")
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}
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return hash(value)
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}
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func hash(value string) (string, error) {
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salt := make([]byte, saltLength)
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if _, err := rand.Read(salt); err != nil {
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return "", fmt.Errorf("generate password salt: %w", err)
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}
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hash := argon2.IDKey([]byte(value), salt, iterations, memory, parallelism, keyLength)
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return fmt.Sprintf("$argon2id$v=19$m=%d,t=%d,p=%d$%s$%s",
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memory, iterations, parallelism,
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base64.RawStdEncoding.EncodeToString(salt),
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base64.RawStdEncoding.EncodeToString(hash),
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), nil
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}
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func Verify(encoded, value string) bool {
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parts := strings.Split(encoded, "$")
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if len(parts) != 6 || parts[1] != "argon2id" || parts[2] != "v=19" {
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return false
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}
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var parsedMemory uint64
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var parsedIterations uint64
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var parsedParallelism uint64
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for _, setting := range strings.Split(parts[3], ",") {
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keyValue := strings.SplitN(setting, "=", 2)
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if len(keyValue) != 2 {
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return false
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}
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number, err := strconv.ParseUint(keyValue[1], 10, 32)
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if err != nil {
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return false
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}
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switch keyValue[0] {
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case "m":
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parsedMemory = number
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case "t":
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parsedIterations = number
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case "p":
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parsedParallelism = number
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}
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}
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if parsedMemory == 0 || parsedMemory > 256*1024 || parsedIterations == 0 || parsedIterations > 10 || parsedParallelism == 0 || parsedParallelism > 8 {
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return false
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}
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salt, err := base64.RawStdEncoding.DecodeString(parts[4])
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if err != nil || len(salt) < 8 {
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return false
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}
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expected, err := base64.RawStdEncoding.DecodeString(parts[5])
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if err != nil || len(expected) < 16 {
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return false
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}
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actual := argon2.IDKey([]byte(value), salt, uint32(parsedIterations), uint32(parsedMemory), uint8(parsedParallelism), uint32(len(expected)))
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return subtle.ConstantTimeCompare(actual, expected) == 1
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}
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