68 lines
1.5 KiB
Go
68 lines
1.5 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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"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 = 65536
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argon2Threads = 4
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argon2KeyLen = 32
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)
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func HashPassword(password string) (string, error) {
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salt := make([]byte, 16)
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_, err := rand.Read(salt)
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if 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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hashedPassword := fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
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argon2.Version, argon2Memory, argon2Time, argon2Threads,
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base64.RawStdEncoding.EncodeToString(salt),
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base64.RawStdEncoding.EncodeToString(hash),
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)
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return hashedPassword, nil
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}
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func VerifyPassword(hashedPassword, password string) bool {
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// Parse the Argon2 hash format: $argon2id$v=19$m=65536,t=3,p=4$salt$hash
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parts := strings.Split(hashedPassword, "$")
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if len(parts) != 6 {
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return false
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}
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// Extract parameters
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var memory, time, threads uint32
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var version int
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fmt.Sscanf(parts[2], "v=%d", &version)
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fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &memory, &time, &threads)
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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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hash, err := base64.RawStdEncoding.DecodeString(parts[5])
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if err != nil {
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return false
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}
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// Generate hash with the same parameters
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derivedKey := argon2.IDKey([]byte(password), salt, time, memory, uint8(threads), uint32(len(hash)))
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// Compare hashes using constant time comparison
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return subtle.ConstantTimeCompare(hash, derivedKey) == 1
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}
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