53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
package store
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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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// argon2id with sane defaults
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const (
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argonTime = 1
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argonMemory = 64 * 1024
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argonThreads = 4
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argonKeyLen = 32
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argonSaltLen = 16
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)
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// Argon2IDHash hashes a password with argon2id.
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func Argon2IDHash(pw string) (string, error) {
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salt := make([]byte, argonSaltLen)
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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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key := argon2.IDKey([]byte(pw), salt, argonTime, argonMemory, argonThreads, argonKeyLen)
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return fmt.Sprintf("$argon2id$v=19$m=%d,t=%d,p=%d$%s$%s",
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argonMemory, argonTime, argonThreads,
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base64.RawStdEncoding.EncodeToString(salt), base64.RawStdEncoding.EncodeToString(key)), nil
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}
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func CheckPassword(hash, pw string) bool {
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parts := strings.Split(hash, "$")
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if len(parts) != 6 || parts[1] != "argon2id" {
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return false
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}
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var m, t uint32
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var p uint8
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fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &m, &t, &p)
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salt, err1 := base64.RawStdEncoding.DecodeString(parts[4])
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want, err2 := base64.RawStdEncoding.DecodeString(parts[5])
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if err1 != nil || err2 != nil {
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return false
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}
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got := argon2.IDKey([]byte(pw), salt, t, m, p, uint32(len(want)))
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return subtle.ConstantTimeCompare(got, want) == 1
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}
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// cryptoRead is used by genSlug
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func cryptoRead(b []byte) (int, error) { return rand.Read(b) }
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