84 lines
2.1 KiB
Go
84 lines
2.1 KiB
Go
package argon2_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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"golang.org/x/crypto/argon2"
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"strings"
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)
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func generateRandomBytes(n uint32) ([]byte, error) {
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b := make([]byte, n)
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_, err := rand.Read(b)
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if err != nil {
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return nil, err
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}
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return b, nil
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}
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func decodeHash(encodedHash string) (p *params, salt, hash []byte, err error) {
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vals := strings.Split(encodedHash, "$")
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if len(vals) != 6 {
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return nil, nil, nil, ErrInvalidHash
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}
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var version int
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_, err = fmt.Sscanf(vals[2], "v=%d", &version)
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if err != nil {
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return nil, nil, nil, err
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}
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if version != argon2.Version {
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return nil, nil, nil, ErrIncompatibleVersion
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}
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p = ¶ms{}
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_, err = fmt.Sscanf(vals[3], "m=%d,t=%d,p=%d", &p.memory, &p.iterations, &p.parallelism)
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if err != nil {
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return nil, nil, nil, err
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}
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salt, err = base64.RawStdEncoding.DecodeString(vals[4])
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if err != nil {
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return nil, nil, nil, err
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}
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p.saltLength = uint32(len(salt))
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hash, err = base64.RawStdEncoding.DecodeString(vals[5])
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if err != nil {
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return nil, nil, nil, err
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}
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p.keyLength = uint32(len(hash))
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return p, salt, hash, nil
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}
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func CompareStringToArgon2Hash(password string, hashedPassword string) (match bool, err error) {
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p, salt, hash, err := decodeHash(hashedPassword)
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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, p.iterations, p.memory, p.parallelism, p.keyLength)
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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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func HashStringArgon2(password string) (encodedHash string, err error) {
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salt, err := generateRandomBytes(p.saltLength)
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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, p.iterations, p.memory, p.parallelism, p.keyLength)
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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", argon2.Version, p.memory, p.iterations, p.parallelism, b64Salt, b64Hash)
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return encodedHash, nil
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}
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func RandomString(s int) (string, error) {
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b, err := generateRandomBytes(uint32(s))
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return base64.URLEncoding.EncodeToString(b), err
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}
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