mirror of
https://github.com/rclone/rclone.git
synced 2024-11-29 20:04:52 +01:00
92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
package pkcs8
|
|
|
|
import (
|
|
"crypto"
|
|
"crypto/sha1"
|
|
"crypto/sha256"
|
|
"crypto/x509/pkix"
|
|
"encoding/asn1"
|
|
"errors"
|
|
"hash"
|
|
|
|
"golang.org/x/crypto/pbkdf2"
|
|
)
|
|
|
|
var (
|
|
oidPKCS5PBKDF2 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 5, 12}
|
|
oidHMACWithSHA1 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 7}
|
|
oidHMACWithSHA256 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 9}
|
|
)
|
|
|
|
func init() {
|
|
RegisterKDF(oidPKCS5PBKDF2, func() KDFParameters {
|
|
return new(pbkdf2Params)
|
|
})
|
|
}
|
|
|
|
func newHashFromPRF(ai pkix.AlgorithmIdentifier) (func() hash.Hash, error) {
|
|
switch {
|
|
case len(ai.Algorithm) == 0 || ai.Algorithm.Equal(oidHMACWithSHA1):
|
|
return sha1.New, nil
|
|
case ai.Algorithm.Equal(oidHMACWithSHA256):
|
|
return sha256.New, nil
|
|
default:
|
|
return nil, errors.New("pkcs8: unsupported hash function")
|
|
}
|
|
}
|
|
|
|
func newPRFParamFromHash(h crypto.Hash) (pkix.AlgorithmIdentifier, error) {
|
|
switch h {
|
|
case crypto.SHA1:
|
|
return pkix.AlgorithmIdentifier{
|
|
Algorithm: oidHMACWithSHA1,
|
|
Parameters: asn1.RawValue{Tag: asn1.TagNull}}, nil
|
|
case crypto.SHA256:
|
|
return pkix.AlgorithmIdentifier{
|
|
Algorithm: oidHMACWithSHA256,
|
|
Parameters: asn1.RawValue{Tag: asn1.TagNull}}, nil
|
|
}
|
|
return pkix.AlgorithmIdentifier{}, errors.New("pkcs8: unsupported hash function")
|
|
}
|
|
|
|
type pbkdf2Params struct {
|
|
Salt []byte
|
|
IterationCount int
|
|
PRF pkix.AlgorithmIdentifier `asn1:"optional"`
|
|
}
|
|
|
|
func (p pbkdf2Params) DeriveKey(password []byte, size int) (key []byte, err error) {
|
|
h, err := newHashFromPRF(p.PRF)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return pbkdf2.Key(password, p.Salt, p.IterationCount, size, h), nil
|
|
}
|
|
|
|
// PBKDF2Opts contains options for the PBKDF2 key derivation function.
|
|
type PBKDF2Opts struct {
|
|
SaltSize int
|
|
IterationCount int
|
|
HMACHash crypto.Hash
|
|
}
|
|
|
|
func (p PBKDF2Opts) DeriveKey(password, salt []byte, size int) (
|
|
key []byte, params KDFParameters, err error) {
|
|
|
|
key = pbkdf2.Key(password, salt, p.IterationCount, size, p.HMACHash.New)
|
|
prfParam, err := newPRFParamFromHash(p.HMACHash)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
params = pbkdf2Params{salt, p.IterationCount, prfParam}
|
|
return key, params, nil
|
|
}
|
|
|
|
func (p PBKDF2Opts) GetSaltSize() int {
|
|
return p.SaltSize
|
|
}
|
|
|
|
func (p PBKDF2Opts) OID() asn1.ObjectIdentifier {
|
|
return oidPKCS5PBKDF2
|
|
}
|