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Schnorr signature support.

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This variation is used by alpha.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2015-06-30 14:15:13 +09:30
parent 1d82bf51fc
commit faae91f3fc
2 changed files with 30 additions and 9 deletions
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4
Makefile
View File

@ -3,8 +3,8 @@
# Needs to have oneof support: Ubuntu vivid's is too old :( # Needs to have oneof support: Ubuntu vivid's is too old :(
PROTOCC:=protoc-c PROTOCC:=protoc-c
# Alpha has segregated witness, checksequenceverify # Alpha has checksequenceverify, segregated witness+input-amount-in-sig+confidentual-transactions, schnorr
#FEATURES := -DHAS_CSV=1 -DALPHA_TXSTYLE=1 #FEATURES := -DHAS_CSV=1 -DALPHA_TXSTYLE=1 -DUSE_SCHNORR=1
PROGRAMS := test-cli/open-channel test-cli/open-anchor-scriptsigs test-cli/leak-anchor-sigs test-cli/open-commit-sig test-cli/check-commit-sig test-cli/check-anchor-scriptsigs test-cli/get-anchor-depth test-cli/create-steal-tx test-cli/create-commit-spend-tx test-cli/close-channel test-cli/create-close-tx test-cli/update-channel test-cli/update-channel-accept test-cli/update-channel-signature test-cli/update-channel-complete test-cli/create-commit-tx PROGRAMS := test-cli/open-channel test-cli/open-anchor-scriptsigs test-cli/leak-anchor-sigs test-cli/open-commit-sig test-cli/check-commit-sig test-cli/check-anchor-scriptsigs test-cli/get-anchor-depth test-cli/create-steal-tx test-cli/create-commit-spend-tx test-cli/close-channel test-cli/create-close-tx test-cli/update-channel test-cli/update-channel-accept test-cli/update-channel-signature test-cli/update-channel-complete test-cli/create-commit-tx

31
bitcoin/signature.c
View File

@ -75,9 +75,15 @@ bool sign_hash(const tal_t *ctx, const struct privkey *privkey,
if (!secpctx) if (!secpctx)
return false; return false;
#ifdef USE_SCHNORR
ok = secp256k1_schnorr_sign(secpctx, h->sha.u.u8,
(unsigned char *)s,
privkey->secret, NULL, NULL);
#else
ok = secp256k1_ecdsa_sign_compact(secpctx, h->sha.u.u8, ok = secp256k1_ecdsa_sign_compact(secpctx, h->sha.u.u8,
(unsigned char *)s, (unsigned char *)s,
privkey->secret, NULL, NULL, NULL); privkey->secret, NULL, NULL, NULL);
#endif
secp256k1_context_destroy(secpctx); secp256k1_context_destroy(secpctx);
return ok; return ok;
@ -132,18 +138,28 @@ static bool check_signed_hash(const struct sha256_double *hash,
{ {
int ret; int ret;
secp256k1_context_t *secpctx; secp256k1_context_t *secpctx;
secpctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY);
if (!secpctx)
return false;
#ifdef USE_SCHNORR
ret = secp256k1_schnorr_verify(secpctx, hash->sha.u.u8,
(unsigned char *)signature,
key->key, pubkey_len(key));
#else
{
u8 der[72]; u8 der[72];
size_t der_len; size_t der_len;
/* FIXME: secp256k1 missing secp256k1_ecdsa_verify_compact */ /* FIXME: secp256k1 missing secp256k1_ecdsa_verify_compact */
der_len = signature_to_der(der, signature); der_len = signature_to_der(der, signature);
secpctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY); ret = secp256k1_ecdsa_verify(secpctx, hash->sha.u.u8,
if (!secpctx) der, der_len,
return false;
ret = secp256k1_ecdsa_verify(secpctx, hash->sha.u.u8, der, der_len,
key->key, pubkey_len(key)); key->key, pubkey_len(key));
}
#endif
secp256k1_context_destroy(secpctx); secp256k1_context_destroy(secpctx);
return ret == 1; return ret == 1;
@ -310,5 +326,10 @@ size_t signature_to_der(u8 der[72], const struct signature *sig)
/* Signature must have low S value. */ /* Signature must have low S value. */
bool sig_valid(const struct signature *sig) bool sig_valid(const struct signature *sig)
{ {
#ifdef USE_SCHNORR
/* FIXME: Is there some sanity check we can do here? */
return true;
#else
return (sig->s[0] & 0x80) == 0; return (sig->s[0] & 0x80) == 0;
#endif
} }