82 lines
1.7 KiB
Go
82 lines
1.7 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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const (
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argon2Time = 3
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argon2Memory = 64 * 1024
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argon2Threads = 4
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argon2KeyLen = 32
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saltLength = 16
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)
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func Hash(password 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 "", err
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}
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hash := argon2.IDKey([]byte(password), salt, argon2Time, argon2Memory, argon2Threads, argon2KeyLen)
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b64Salt := base64.RawStdEncoding.EncodeToString(salt)
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b64Hash := base64.RawStdEncoding.EncodeToString(hash)
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encodedHash := fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
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argon2.Version, argon2Memory, argon2Time, argon2Threads, b64Salt, b64Hash)
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return encodedHash, nil
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}
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func Verify(password, encodedHash string) (bool, error) {
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parts := strings.Split(encodedHash, "$")
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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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if parts[1] != "argon2id" {
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return false, fmt.Errorf("unsupported hash algorithm")
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}
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var version 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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var memory, time uint32
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var threads uint8
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_, err = fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &memory, &time, &threads)
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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, time, memory, threads, uint32(len(hash)))
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if subtle.ConstantTimeCompare(hash, otherHash) == 1 {
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return true, nil
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}
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return false, nil
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}
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