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Merge pull request #2229 from philsmd/master

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re-enable USE_SYSTEM_LIBSECP256K1 = 1
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Jens Steube 2019-11-17 13:17:00 +01:00 committed by GitHub
commit 5dc6954b55
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2 changed files with 53 additions and 4 deletions
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3
src/Makefile
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@ -14,6 +14,9 @@ USE_SYSTEM_LIBSECP256K1 := 0
USE_SYSTEM_OPENCL := 0
USE_SYSTEM_XXHASH := 0
# NOTE: USE_SYSTEM_LIBSECP256K1 set to 1 can come with a huge performance hit for Electrum 4-5
# this is due to the public API (secp256k1.h) not exposing all the faster ECC operations we need
##
## Detect Operating System
##

54
src/ext_secp256k1.c
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@ -14,7 +14,7 @@
// some macros needed for secp256k1 header and source code includes:
// is this a good 64-bit support check ?
#if !defined(__LP64__) && !defined(_WIN64) && !defined(__x86_64__)
#if !defined (__LP64__) && !defined (_WIN64) && !defined (__x86_64__)
#define USE_SCALAR_8X32
#define USE_FIELD_10X26
@ -60,12 +60,14 @@ bool hc_secp256k1_pubkey_parse (secp256k1_pubkey *pubkey, u8 *buf, size_t length
bool hc_secp256k1_pubkey_tweak_mul (secp256k1_pubkey *pubkey, u8 *buf, size_t length)
{
#if !defined (WITH_LIBSECP256K1)
secp256k1_context *sctx = secp256k1_context_create (SECP256K1_CONTEXT_NONE);
secp256k1_gej res;
secp256k1_ge pt;
// load the public key:
// load the public key and 32 byte scalar:
secp256k1_pubkey_load (sctx, &pt, pubkey);
@ -75,8 +77,23 @@ bool hc_secp256k1_pubkey_tweak_mul (secp256k1_pubkey *pubkey, u8 *buf, size_t le
secp256k1_scalar_set_b32 (&s, buf, &overflow);
if (overflow) return false;
if (secp256k1_scalar_is_zero (&s)) return false;
if (overflow != 0)
{
secp256k1_scalar_clear (&s);
secp256k1_context_destroy (sctx);
return false;
}
if (secp256k1_scalar_is_zero (&s))
{
secp256k1_scalar_clear (&s);
secp256k1_context_destroy (sctx);
return false;
}
// main multiply operation:
@ -99,7 +116,36 @@ bool hc_secp256k1_pubkey_tweak_mul (secp256k1_pubkey *pubkey, u8 *buf, size_t le
// cleanup:
secp256k1_scalar_clear (&s);
secp256k1_context_destroy (sctx);
#else
// ATTENTION: this way to multiply was much slower in our tests
secp256k1_context *sctx = secp256k1_context_create (SECP256K1_CONTEXT_VERIFY);
// main multiply operation:
if (secp256k1_ec_pubkey_tweak_mul (sctx, pubkey, buf) == 0)
{
secp256k1_context_destroy (sctx);
return false;
}
// output:
secp256k1_ec_pubkey_serialize (sctx, buf, &length, pubkey, SECP256K1_EC_COMPRESSED);
// cleanup:
secp256k1_context_destroy (sctx);
#endif
return true;
}