111 lines
3 KiB
Go
111 lines
3 KiB
Go
package olm
|
|
|
|
// #cgo LDFLAGS: -lolm -lstdc++
|
|
// #include <olm/olm.h>
|
|
// #include <olm/pk.h>
|
|
import "C"
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"encoding/json"
|
|
"unsafe"
|
|
|
|
"github.com/tidwall/sjson"
|
|
|
|
"maunium.net/go/mautrix/crypto/canonicaljson"
|
|
"maunium.net/go/mautrix/id"
|
|
)
|
|
|
|
// PkSigning stores a key pair for signing messages.
|
|
type PkSigning struct {
|
|
int *C.OlmPkSigning
|
|
mem []byte
|
|
PublicKey id.Ed25519
|
|
Seed []byte
|
|
}
|
|
|
|
func pkSigningSize() uint {
|
|
return uint(C.olm_pk_signing_size())
|
|
}
|
|
|
|
func pkSigningSeedLength() uint {
|
|
return uint(C.olm_pk_signing_seed_length())
|
|
}
|
|
|
|
func pkSigningPublicKeyLength() uint {
|
|
return uint(C.olm_pk_signing_public_key_length())
|
|
}
|
|
|
|
func pkSigningSignatureLength() uint {
|
|
return uint(C.olm_pk_signature_length())
|
|
}
|
|
|
|
func NewBlankPkSigning() *PkSigning {
|
|
memory := make([]byte, pkSigningSize())
|
|
return &PkSigning{
|
|
int: C.olm_pk_signing(unsafe.Pointer(&memory[0])),
|
|
mem: memory,
|
|
}
|
|
}
|
|
|
|
// Clear clears the underlying memory of a PkSigning object.
|
|
func (p *PkSigning) Clear() {
|
|
C.olm_clear_pk_signing((*C.OlmPkSigning)(p.int))
|
|
}
|
|
|
|
// NewPkSigningFromSeed creates a new PkSigning object using the given seed.
|
|
func NewPkSigningFromSeed(seed []byte) (*PkSigning, error) {
|
|
p := NewBlankPkSigning()
|
|
p.Clear()
|
|
pubKey := make([]byte, pkSigningPublicKeyLength())
|
|
if C.olm_pk_signing_key_from_seed((*C.OlmPkSigning)(p.int),
|
|
unsafe.Pointer(&pubKey[0]), C.size_t(len(pubKey)),
|
|
unsafe.Pointer(&seed[0]), C.size_t(len(seed))) == errorVal() {
|
|
return nil, p.lastError()
|
|
}
|
|
p.PublicKey = id.Ed25519(pubKey)
|
|
p.Seed = seed
|
|
return p, nil
|
|
}
|
|
|
|
// NewPkSigning creates a new PkSigning object, containing a key pair for signing messages.
|
|
func NewPkSigning() (*PkSigning, error) {
|
|
// Generate the seed
|
|
seed := make([]byte, pkSigningSeedLength())
|
|
_, err := rand.Read(seed)
|
|
if err != nil {
|
|
panic(NotEnoughGoRandom)
|
|
}
|
|
pk, err := NewPkSigningFromSeed(seed)
|
|
return pk, err
|
|
}
|
|
|
|
// Sign creates a signature for the given message using this key.
|
|
func (p *PkSigning) Sign(message []byte) ([]byte, error) {
|
|
signature := make([]byte, pkSigningSignatureLength())
|
|
if C.olm_pk_sign((*C.OlmPkSigning)(p.int), (*C.uint8_t)(unsafe.Pointer(&message[0])), C.size_t(len(message)),
|
|
(*C.uint8_t)(unsafe.Pointer(&signature[0])), C.size_t(len(signature))) == errorVal() {
|
|
return nil, p.lastError()
|
|
}
|
|
return signature, nil
|
|
}
|
|
|
|
// SignJSON creates a signature for the given object after encoding it to canonical JSON.
|
|
func (p *PkSigning) SignJSON(obj interface{}) (string, error) {
|
|
objJSON, err := json.Marshal(obj)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
objJSON, _ = sjson.DeleteBytes(objJSON, "unsigned")
|
|
objJSON, _ = sjson.DeleteBytes(objJSON, "signatures")
|
|
signature, err := p.Sign(canonicaljson.CanonicalJSONAssumeValid(objJSON))
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return string(signature), nil
|
|
}
|
|
|
|
// lastError returns the last error that happened in relation to this PkSigning object.
|
|
func (p *PkSigning) lastError() error {
|
|
return convertError(C.GoString(C.olm_pk_signing_last_error((*C.OlmPkSigning)(p.int))))
|
|
}
|