76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
package utils
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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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"fmt"
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"strings"
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"golang.org/x/crypto/argon2"
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)
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var (
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Time uint32 = 3
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Memory uint32 = 64 * 1024 // 64 MiB (in KiB)
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Threads uint8 = 4
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KeyLen uint32 = 32
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SaltLen int = 16
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)
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// HashPassword hashes a password using Argon2.
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func HashPassword(password string) (string, error) {
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salt := make([]byte, SaltLen)
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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, Time, Memory, Threads, KeyLen)
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// Encode salt and hash to base64
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b64Salt := base64.RawStdEncoding.EncodeToString(salt)
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b64Hash := base64.RawStdEncoding.EncodeToString(hash)
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// Format is $argon2id$v=19$m=...,t=...,p=...$salt$hash
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encodedHash := fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
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argon2.Version, Memory, Time, Threads, b64Salt, b64Hash)
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return encodedHash, nil
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}
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// ComparePassword verifies a password against an Argon2 hash.
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func ComparePassword(password, encodedHash string) (bool, error) {
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parts := strings.Split(encodedHash, "$")
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if len(parts) != 6 {
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return false, fmt.Errorf("invalid hash format")
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}
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var version, m, t, p int
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_, err := fmt.Sscanf(parts[2], "v=%d", &version)
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if err != nil {
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return false, err
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}
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if version != argon2.Version {
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return false, fmt.Errorf("incompatible version")
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}
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_, err = fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &m, &t, &p)
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if err != nil {
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return false, err
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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, err
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}
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hash, err := base64.RawStdEncoding.DecodeString(parts[5])
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if err != nil {
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return false, err
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}
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otherHash := argon2.IDKey([]byte(password), salt, uint32(t), uint32(m), uint8(p), uint32(len(hash)))
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return subtle.ConstantTimeCompare(hash, otherHash) == 1, nil
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}
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