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-rw-r--r--src/ecwrapper.cpp166
1 files changed, 1 insertions, 165 deletions
diff --git a/src/ecwrapper.cpp b/src/ecwrapper.cpp
index e5db670927..68cdbf2eda 100644
--- a/src/ecwrapper.cpp
+++ b/src/ecwrapper.cpp
@@ -1,5 +1,5 @@
// Copyright (c) 2009-2014 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "ecwrapper.h"
@@ -13,43 +13,6 @@
namespace {
-// Generate a private key from just the secret parameter
-int EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
-{
- int ok = 0;
- BN_CTX *ctx = NULL;
- EC_POINT *pub_key = NULL;
-
- if (!eckey) return 0;
-
- const EC_GROUP *group = EC_KEY_get0_group(eckey);
-
- if ((ctx = BN_CTX_new()) == NULL)
- goto err;
-
- pub_key = EC_POINT_new(group);
-
- if (pub_key == NULL)
- goto err;
-
- if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx))
- goto err;
-
- EC_KEY_set_private_key(eckey,priv_key);
- EC_KEY_set_public_key(eckey,pub_key);
-
- ok = 1;
-
-err:
-
- if (pub_key)
- EC_POINT_free(pub_key);
- if (ctx != NULL)
- BN_CTX_free(ctx);
-
- return(ok);
-}
-
// Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
// recid selects which key is recovered
// if check is non-zero, additional checks are performed
@@ -135,48 +98,6 @@ CECKey::~CECKey() {
EC_KEY_free(pkey);
}
-void CECKey::GetSecretBytes(unsigned char vch[32]) const {
- const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
- assert(bn);
- int nBytes = BN_num_bytes(bn);
- int n=BN_bn2bin(bn,&vch[32 - nBytes]);
- assert(n == nBytes);
- memset(vch, 0, 32 - nBytes);
-}
-
-void CECKey::SetSecretBytes(const unsigned char vch[32]) {
- bool ret;
- BIGNUM bn;
- BN_init(&bn);
- ret = BN_bin2bn(vch, 32, &bn) != NULL;
- assert(ret);
- ret = EC_KEY_regenerate_key(pkey, &bn) != 0;
- assert(ret);
- BN_clear_free(&bn);
-}
-
-int CECKey::GetPrivKeySize(bool fCompressed) {
- EC_KEY_set_conv_form(pkey, fCompressed ? POINT_CONVERSION_COMPRESSED : POINT_CONVERSION_UNCOMPRESSED);
- return i2d_ECPrivateKey(pkey, NULL);
-}
-int CECKey::GetPrivKey(unsigned char* privkey, bool fCompressed) {
- EC_KEY_set_conv_form(pkey, fCompressed ? POINT_CONVERSION_COMPRESSED : POINT_CONVERSION_UNCOMPRESSED);
- return i2d_ECPrivateKey(pkey, &privkey);
-}
-
-bool CECKey::SetPrivKey(const unsigned char* privkey, size_t size, bool fSkipCheck) {
- if (d2i_ECPrivateKey(&pkey, &privkey, size)) {
- if(fSkipCheck)
- return true;
-
- // d2i_ECPrivateKey returns true if parsing succeeds.
- // This doesn't necessarily mean the key is valid.
- if (EC_KEY_check_key(pkey))
- return true;
- }
- return false;
-}
-
void CECKey::GetPubKey(std::vector<unsigned char> &pubkey, bool fCompressed) {
EC_KEY_set_conv_form(pkey, fCompressed ? POINT_CONVERSION_COMPRESSED : POINT_CONVERSION_UNCOMPRESSED);
int nSize = i2o_ECPublicKey(pkey, NULL);
@@ -193,33 +114,6 @@ bool CECKey::SetPubKey(const unsigned char* pubkey, size_t size) {
return o2i_ECPublicKey(&pkey, &pubkey, size) != NULL;
}
-bool CECKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, bool lowS) {
- vchSig.clear();
- ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
- if (sig == NULL)
- return false;
- BN_CTX *ctx = BN_CTX_new();
- BN_CTX_start(ctx);
- const EC_GROUP *group = EC_KEY_get0_group(pkey);
- BIGNUM *order = BN_CTX_get(ctx);
- BIGNUM *halforder = BN_CTX_get(ctx);
- EC_GROUP_get_order(group, order, ctx);
- BN_rshift1(halforder, order);
- if (lowS && BN_cmp(sig->s, halforder) > 0) {
- // enforce low S values, by negating the value (modulo the order) if above order/2.
- BN_sub(sig->s, order, sig->s);
- }
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- unsigned int nSize = ECDSA_size(pkey);
- vchSig.resize(nSize); // Make sure it is big enough
- unsigned char *pos = &vchSig[0];
- nSize = i2d_ECDSA_SIG(sig, &pos);
- ECDSA_SIG_free(sig);
- vchSig.resize(nSize); // Shrink to fit actual size
- return true;
-}
-
bool CECKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) {
// -1 = error, 0 = bad sig, 1 = good
if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1)
@@ -227,37 +121,6 @@ bool CECKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSi
return true;
}
-bool CECKey::SignCompact(const uint256 &hash, unsigned char *p64, int &rec) {
- bool fOk = false;
- ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
- if (sig==NULL)
- return false;
- memset(p64, 0, 64);
- int nBitsR = BN_num_bits(sig->r);
- int nBitsS = BN_num_bits(sig->s);
- if (nBitsR <= 256 && nBitsS <= 256) {
- std::vector<unsigned char> pubkey;
- GetPubKey(pubkey, true);
- for (int i=0; i<4; i++) {
- CECKey keyRec;
- if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1) {
- std::vector<unsigned char> pubkeyRec;
- keyRec.GetPubKey(pubkeyRec, true);
- if (pubkeyRec == pubkey) {
- rec = i;
- fOk = true;
- break;
- }
- }
- }
- assert(fOk);
- BN_bn2bin(sig->r,&p64[32-(nBitsR+7)/8]);
- BN_bn2bin(sig->s,&p64[64-(nBitsS+7)/8]);
- }
- ECDSA_SIG_free(sig);
- return fOk;
-}
-
bool CECKey::Recover(const uint256 &hash, const unsigned char *p64, int rec)
{
if (rec<0 || rec>=3)
@@ -270,33 +133,6 @@ bool CECKey::Recover(const uint256 &hash, const unsigned char *p64, int rec)
return ret;
}
-bool CECKey::TweakSecret(unsigned char vchSecretOut[32], const unsigned char vchSecretIn[32], const unsigned char vchTweak[32])
-{
- bool ret = true;
- BN_CTX *ctx = BN_CTX_new();
- BN_CTX_start(ctx);
- BIGNUM *bnSecret = BN_CTX_get(ctx);
- BIGNUM *bnTweak = BN_CTX_get(ctx);
- BIGNUM *bnOrder = BN_CTX_get(ctx);
- EC_GROUP *group = EC_GROUP_new_by_curve_name(NID_secp256k1);
- EC_GROUP_get_order(group, bnOrder, ctx); // what a grossly inefficient way to get the (constant) group order...
- BN_bin2bn(vchTweak, 32, bnTweak);
- if (BN_cmp(bnTweak, bnOrder) >= 0)
- ret = false; // extremely unlikely
- BN_bin2bn(vchSecretIn, 32, bnSecret);
- BN_add(bnSecret, bnSecret, bnTweak);
- BN_nnmod(bnSecret, bnSecret, bnOrder, ctx);
- if (BN_is_zero(bnSecret))
- ret = false; // ridiculously unlikely
- int nBits = BN_num_bits(bnSecret);
- memset(vchSecretOut, 0, 32);
- BN_bn2bin(bnSecret, &vchSecretOut[32-(nBits+7)/8]);
- EC_GROUP_free(group);
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- return ret;
-}
-
bool CECKey::TweakPublic(const unsigned char vchTweak[32]) {
bool ret = true;
BN_CTX *ctx = BN_CTX_new();
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-10 19:50:25 +0000