62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
package auth
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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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"strings"
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"golang.org/x/crypto/argon2"
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)
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const (
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argonMemory = 64 * 1024
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argonTime = 3
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argonThreads = 2
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argonKeyLen = 32
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)
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func HashPassword(password string) (string, error) {
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if len(password) < 8 {
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return "", errors.New("password must contain at least 8 characters")
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}
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if len(password) > 1024 {
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return "", errors.New("password is too long")
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}
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salt := make([]byte, 16)
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if _, err := rand.Read(salt); err != nil {
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return "", err
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}
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hash := argon2.IDKey([]byte(password), salt, argonTime, argonMemory, argonThreads, argonKeyLen)
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return fmt.Sprintf("$argon2id$v=19$m=%d,t=%d,p=%d$%s$%s", argonMemory, argonTime, argonThreads,
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base64.RawStdEncoding.EncodeToString(salt), base64.RawStdEncoding.EncodeToString(hash)), nil
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}
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func VerifyPassword(encoded, password string) bool {
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parts := strings.Split(encoded, "$")
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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 memory uint32
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var iterations uint32
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var threads uint8
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if _, err := fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &memory, &iterations, &threads); err != nil {
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return false
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}
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if memory > 256*1024 || iterations > 10 || threads > 16 {
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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 {
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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) == 0 {
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return false
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}
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actual := argon2.IDKey([]byte(password), salt, iterations, memory, threads, uint32(len(expected)))
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return subtle.ConstantTimeCompare(actual, expected) == 1
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}
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