53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
package asymetric
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"errors"
|
|
|
|
"github.com/didiercrunch/filou/contract"
|
|
"github.com/didiercrunch/filou/helper"
|
|
)
|
|
|
|
type PublicKeyEncryptor interface {
|
|
Encrypt(data []byte) ([]byte, error)
|
|
}
|
|
|
|
type Signer interface {
|
|
Sign(data []byte) ([]byte, error)
|
|
}
|
|
|
|
func GetSigner(contract_ *contract.AcceptedContract) (Signer, error) {
|
|
if contract_.SignatureScheme == "rsa_pss" {
|
|
return getRsaPssSignerFromContract(contract_)
|
|
}
|
|
return nil, errors.New("signature scheme " + contract_.SignatureScheme + " not supported")
|
|
}
|
|
|
|
func GetPublicKeyEncryptor(contract_ *contract.AcceptedContract) (PublicKeyEncryptor, error) {
|
|
if contract_.AsynchronousEncryptionScheme == "rsa_oaep" {
|
|
return getRsaOaepEncryptorFromContract(contract_)
|
|
} else {
|
|
return nil, errors.New("asynchronous encryption scheme " + contract_.AsynchronousEncryptionScheme + " not supported")
|
|
}
|
|
}
|
|
|
|
func getRsaPssSignerFromContract(con *contract.AcceptedContract) (*RsaPssSigner, error) {
|
|
if privKey, err := con.RsaPrivateKey(); err != nil {
|
|
return nil, err
|
|
} else if hash, err := helper.GetHashFunctionByLowerCaseName(con.Hash); err != nil {
|
|
return nil, err
|
|
} else {
|
|
return &RsaPssSigner{privKey, con.RsaPublicKey, hash, rand.Reader}, nil
|
|
}
|
|
}
|
|
|
|
func getRsaOaepEncryptorFromContract(con *contract.AcceptedContract) (*RsaOaepEncrypter, error) {
|
|
if privKey, err := con.RsaPrivateKey(); err != nil {
|
|
return nil, err
|
|
} else if hash, err := helper.GetHashFunctionByLowerCaseName(con.Hash); err != nil {
|
|
return nil, err
|
|
} else {
|
|
return &RsaOaepEncrypter{privKey, con.RsaPublicKey, hash, rand.Reader}, nil
|
|
}
|
|
}
|