forked from cerc-io/plugeth
Update Go wrapper around libbsecp256k1
This commit is contained in:
Gustav Simonsson
parent
f4d4f1ccb2
commit
d9b37b6da7
@ -1,13 +1,14 @@
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package secp256k1
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// TODO: set USE_SCALAR_4X64 depending on platform?
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/*
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#cgo CFLAGS: -std=gnu99 -Wno-error
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#cgo darwin CFLAGS: -I/usr/local/include
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#cgo LDFLAGS: -lgmp
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#cgo darwin LDFLAGS: -L/usr/local/lib
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#define USE_FIELD_10X26
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#cgo CFLAGS: -I./secp256k1
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#define USE_NUM_GMP
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#define USE_FIELD_10X26
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#define USE_FIELD_INV_BUILTIN
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#define USE_SCALAR_8X32
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#define USE_SCALAR_INV_BUILTIN
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#include "./secp256k1/src/secp256k1.c"
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*/
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import "C"
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@ -38,32 +39,14 @@ import (
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*/
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func init() {
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C.secp256k1_start() //takes 10ms to 100ms
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//takes 10ms to 100ms
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C.secp256k1_start(3) // SECP256K1_START_SIGN | SECP256K1_START_VERIFY
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}
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func Stop() {
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C.secp256k1_stop()
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}
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/*
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int secp256k1_ecdsa_pubkey_create(
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unsigned char *pubkey, int *pubkeylen,
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const unsigned char *seckey, int compressed);
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*/
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/** Compute the public key for a secret key.
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* In: compressed: whether the computed public key should be compressed
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* seckey: pointer to a 32-byte private key.
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* Out: pubkey: pointer to a 33-byte (if compressed) or 65-byte (if uncompressed)
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* area to store the public key.
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* pubkeylen: pointer to int that will be updated to contains the pubkey's
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* length.
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* Returns: 1: secret was valid, public key stores
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* 0: secret was invalid, try again.
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*/
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//pubkey, seckey
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func GenerateKeyPair() ([]byte, []byte) {
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pubkey_len := C.int(65)
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@ -75,7 +58,7 @@ func GenerateKeyPair() ([]byte, []byte) {
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var pubkey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
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var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
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ret := C.secp256k1_ecdsa_pubkey_create(
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ret := C.secp256k1_ec_pubkey_create(
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pubkey_ptr, &pubkey_len,
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seckey_ptr, 0)
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@ -98,7 +81,7 @@ func GeneratePubKey(seckey []byte) ([]byte, error) {
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var pubkey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
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var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
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ret := C.secp256k1_ecdsa_pubkey_create(
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ret := C.secp256k1_ec_pubkey_create(
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pubkey_ptr, &pubkey_len,
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seckey_ptr, 0)
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@ -109,26 +92,6 @@ func GeneratePubKey(seckey []byte) ([]byte, error) {
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return pubkey, nil
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}
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/*
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* Create a compact ECDSA signature (64 byte + recovery id).
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* Returns: 1: signature created
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* 0: nonce invalid, try another one
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* In: msg: the message being signed
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* msglen: the length of the message being signed
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* seckey: pointer to a 32-byte secret key (assumed to be valid)
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* nonce: pointer to a 32-byte nonce (generated with a cryptographic PRNG)
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* Out: sig: pointer to a 64-byte array where the signature will be placed.
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* recid: pointer to an int, which will be updated to contain the recovery id.
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*/
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/*
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int secp256k1_ecdsa_sign_compact(const unsigned char *msg, int msglen,
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unsigned char *sig64,
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const unsigned char *seckey,
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const unsigned char *nonce,
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int *recid);
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*/
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func Sign(msg []byte, seckey []byte) ([]byte, error) {
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nonce := randentropy.GetEntropyMixed(32)
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@ -136,19 +99,22 @@ func Sign(msg []byte, seckey []byte) ([]byte, error) {
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var recid C.int
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var msg_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&msg[0]))
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var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
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var nonce_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&nonce[0]))
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var sig_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&sig[0]))
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var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
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if C.secp256k1_ecdsa_seckey_verify(seckey_ptr) != C.int(1) {
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var noncefp_ptr = &(*C.secp256k1_nonce_function_default)
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var ndata_ptr = unsafe.Pointer(&nonce[0])
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if C.secp256k1_ec_seckey_verify(seckey_ptr) != C.int(1) {
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return nil, errors.New("Invalid secret key")
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}
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ret := C.secp256k1_ecdsa_sign_compact(
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msg_ptr, C.int(len(msg)),
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msg_ptr,
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sig_ptr,
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seckey_ptr,
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nonce_ptr,
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noncefp_ptr,
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ndata_ptr,
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&recid)
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sig[64] = byte(int(recid))
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@ -162,37 +128,24 @@ func Sign(msg []byte, seckey []byte) ([]byte, error) {
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}
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/*
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* Verify an ECDSA secret key.
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* Returns: 1: secret key is valid
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* 0: secret key is invalid
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* In: seckey: pointer to a 32-byte secret key
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*/
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func VerifySeckeyValidity(seckey []byte) error {
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if len(seckey) != 32 {
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return errors.New("priv key is not 32 bytes")
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}
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var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
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ret := C.secp256k1_ecdsa_seckey_verify(seckey_ptr)
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ret := C.secp256k1_ec_seckey_verify(seckey_ptr)
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if int(ret) != 1 {
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return errors.New("invalid seckey")
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}
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return nil
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}
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/*
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* Validate a public key.
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* Returns: 1: valid public key
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* 0: invalid public key
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*/
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func VerifyPubkeyValidity(pubkey []byte) error {
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if len(pubkey) != 65 {
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return errors.New("pub key is not 65 bytes")
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}
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var pubkey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
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ret := C.secp256k1_ecdsa_pubkey_verify(pubkey_ptr, 65)
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ret := C.secp256k1_ec_pubkey_verify(pubkey_ptr, 65)
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if int(ret) != 1 {
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return errors.New("invalid pubkey")
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}
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@ -254,25 +207,6 @@ func VerifySignature(msg []byte, sig []byte, pubkey1 []byte) error {
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return nil
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}
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/*
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int secp256k1_ecdsa_recover_compact(const unsigned char *msg, int msglen,
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const unsigned char *sig64,
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unsigned char *pubkey, int *pubkeylen,
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int compressed, int recid);
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*/
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/*
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* Recover an ECDSA public key from a compact signature.
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* Returns: 1: public key succesfully recovered (which guarantees a correct signature).
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* 0: otherwise.
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* In: msg: the message assumed to be signed
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* msglen: the length of the message
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* compressed: whether to recover a compressed or uncompressed pubkey
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* recid: the recovery id (as returned by ecdsa_sign_compact)
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* Out: pubkey: pointer to a 33 or 65 byte array to put the pubkey.
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* pubkeylen: pointer to an int that will contain the pubkey length.
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*/
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//recovers the public key from the signature
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//recovery of pubkey means correct signature
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func RecoverPubkey(msg []byte, sig []byte) ([]byte, error) {
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@ -289,10 +223,12 @@ func RecoverPubkey(msg []byte, sig []byte) ([]byte, error) {
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var pubkeylen C.int
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ret := C.secp256k1_ecdsa_recover_compact(
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msg_ptr, C.int(len(msg)),
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msg_ptr,
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sig_ptr,
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pubkey_ptr, &pubkeylen,
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C.int(0), C.int(sig[64]),
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pubkey_ptr,
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&pubkeylen,
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C.int(0),
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C.int(sig[64]),
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)
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if ret == C.int(0) {
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