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Work around too deterministic nonce

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This commit is contained in:
Peter Conrad 2015-03-11 15:54:21 +01:00
parent 1de9a3ba87
commit d69e67c032
1 changed files with 10 additions and 1 deletions
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11
src/crypto/elliptic_secp256k1.cpp
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@ -82,14 +82,23 @@ namespace fc { namespace ecc {
return fc::sha512::hash( pub.begin() + 1, pub.size() - 1 );
}
static int extended_nonce_function( unsigned char *nonce32, const unsigned char *msg32,
const unsigned char *key32, unsigned int attempt,
const void *data ) {
unsigned int* extra = (unsigned int*) data;
(*extra)++;
return secp256k1_nonce_function_default( nonce32, msg32, key32, *extra, nullptr );
}
compact_signature private_key::sign_compact( const fc::sha256& digest )const
{
FC_ASSERT( my->_key != nullptr );
compact_signature result;
int recid;
unsigned int counter = 0;
do
{
FC_ASSERT( secp256k1_ecdsa_sign_compact( (unsigned char*) digest.data(), (unsigned char*) result.begin() + 1, (unsigned char*) my->_key->data(), NULL, NULL, &recid ));
FC_ASSERT( secp256k1_ecdsa_sign_compact( (unsigned char*) digest.data(), (unsigned char*) result.begin() + 1, (unsigned char*) my->_key->data(), extended_nonce_function, &counter, &recid ));
} while( !public_key::is_canonical( result ) );
result.begin()[0] = 27 + 4 + recid;
return result;