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CSecret/CKey -> CKey/CPubKey split/refactor
This commit is contained in:
Pieter Wuille
committed by
Pieter Wuille
Pieter Wuille
parent
5d891489ab
commit
dfa23b94c2
497
src/key.cpp
497
src/key.cpp
@@ -2,13 +2,16 @@
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <map>
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#include <openssl/ecdsa.h>
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#include <openssl/rand.h>
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#include <openssl/obj_mac.h>
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#include "key.h"
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// anonymous namespace with local implementation code (OpenSSL interaction)
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namespace {
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// Generate a private key from just the secret parameter
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int EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
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{
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@@ -120,293 +123,273 @@ err:
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return ret;
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}
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void CKey::SetCompressedPubKey(bool fCompressed)
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{
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EC_KEY_set_conv_form(pkey, fCompressed ? POINT_CONVERSION_COMPRESSED : POINT_CONVERSION_UNCOMPRESSED);
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fCompressedPubKey = true;
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}
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// RAII Wrapper around OpenSSL's EC_KEY
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class CECKey {
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private:
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EC_KEY *pkey;
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void CKey::Reset()
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{
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fCompressedPubKey = false;
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if (pkey != NULL)
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public:
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CECKey() {
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
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assert(pkey != NULL);
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}
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~CECKey() {
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EC_KEY_free(pkey);
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
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if (pkey == NULL)
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throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed");
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fSet = false;
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}
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}
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CKey::CKey()
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{
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pkey = NULL;
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Reset();
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}
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void GetSecretBytes(unsigned char vch[32]) const {
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const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
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assert(bn);
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int nBytes = BN_num_bytes(bn);
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int n=BN_bn2bin(bn,&vch[32 - nBytes]);
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assert(n == nBytes);
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memset(vch, 0, 32 - nBytes);
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}
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CKey::CKey(const CKey& b)
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{
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pkey = EC_KEY_dup(b.pkey);
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if (pkey == NULL)
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throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
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fSet = b.fSet;
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}
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void SetSecretBytes(const unsigned char vch[32]) {
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BIGNUM bn;
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BN_init(&bn);
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assert(BN_bin2bn(vch, 32, &bn));
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assert(EC_KEY_regenerate_key(pkey, &bn));
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BN_clear_free(&bn);
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}
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CKey& CKey::operator=(const CKey& b)
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{
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if (!EC_KEY_copy(pkey, b.pkey))
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throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
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fSet = b.fSet;
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return (*this);
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}
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void GetPrivKey(CPrivKey &privkey) {
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int nSize = i2d_ECPrivateKey(pkey, NULL);
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assert(nSize);
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privkey.resize(nSize);
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unsigned char* pbegin = &privkey[0];
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int nSize2 = i2d_ECPrivateKey(pkey, &pbegin);
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assert(nSize == nSize2);
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}
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CKey::~CKey()
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{
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EC_KEY_free(pkey);
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}
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bool CKey::IsNull() const
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{
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return !fSet;
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}
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bool CKey::IsCompressed() const
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{
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return fCompressedPubKey;
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}
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void CKey::MakeNewKey(bool fCompressed)
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{
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if (!EC_KEY_generate_key(pkey))
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throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed");
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if (fCompressed)
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SetCompressedPubKey();
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fSet = true;
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}
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bool CKey::SetPrivKey(const CPrivKey& vchPrivKey)
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{
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const unsigned char* pbegin = &vchPrivKey[0];
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if (d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size()))
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{
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// In testing, d2i_ECPrivateKey can return true
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// but fill in pkey with a key that fails
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// EC_KEY_check_key, so:
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if (EC_KEY_check_key(pkey))
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{
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fSet = true;
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return true;
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bool SetPrivKey(const CPrivKey &privkey) {
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const unsigned char* pbegin = &privkey[0];
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if (d2i_ECPrivateKey(&pkey, &pbegin, privkey.size())) {
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// d2i_ECPrivateKey returns true if parsing succeeds.
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// This doesn't necessarily mean the key is valid.
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if (EC_KEY_check_key(pkey))
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return true;
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}
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return false;
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}
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// If vchPrivKey data is bad d2i_ECPrivateKey() can
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// leave pkey in a state where calling EC_KEY_free()
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// crashes. To avoid that, set pkey to NULL and
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// leak the memory (a leak is better than a crash)
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pkey = NULL;
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Reset();
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return false;
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}
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bool CKey::SetSecret(const CSecret& vchSecret, bool fCompressed)
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{
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EC_KEY_free(pkey);
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
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if (pkey == NULL)
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throw key_error("CKey::SetSecret() : EC_KEY_new_by_curve_name failed");
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if (vchSecret.size() != 32)
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throw key_error("CKey::SetSecret() : secret must be 32 bytes");
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BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new());
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if (bn == NULL)
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throw key_error("CKey::SetSecret() : BN_bin2bn failed");
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if (!EC_KEY_regenerate_key(pkey,bn))
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{
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BN_clear_free(bn);
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throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
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void GetPubKey(CPubKey &pubkey, bool fCompressed) {
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EC_KEY_set_conv_form(pkey, fCompressed ? POINT_CONVERSION_COMPRESSED : POINT_CONVERSION_UNCOMPRESSED);
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int nSize = i2o_ECPublicKey(pkey, NULL);
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assert(nSize);
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assert(nSize <= 65);
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unsigned char c[65];
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unsigned char *pbegin = c;
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int nSize2 = i2o_ECPublicKey(pkey, &pbegin);
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assert(nSize == nSize2);
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pubkey.Set(&c[0], &c[nSize]);
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}
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BN_clear_free(bn);
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fSet = true;
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if (fCompressed || fCompressedPubKey)
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SetCompressedPubKey();
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return true;
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}
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CSecret CKey::GetSecret(bool &fCompressed) const
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{
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CSecret vchRet;
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vchRet.resize(32);
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const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
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int nBytes = BN_num_bytes(bn);
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if (bn == NULL)
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throw key_error("CKey::GetSecret() : EC_KEY_get0_private_key failed");
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int n=BN_bn2bin(bn,&vchRet[32 - nBytes]);
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if (n != nBytes)
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throw key_error("CKey::GetSecret(): BN_bn2bin failed");
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fCompressed = fCompressedPubKey;
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return vchRet;
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}
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bool SetPubKey(const CPubKey &pubkey) {
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const unsigned char* pbegin = pubkey.begin();
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return o2i_ECPublicKey(&pkey, &pbegin, pubkey.size());
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}
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CPrivKey CKey::GetPrivKey() const
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{
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int nSize = i2d_ECPrivateKey(pkey, NULL);
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if (!nSize)
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throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed");
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CPrivKey vchPrivKey(nSize, 0);
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unsigned char* pbegin = &vchPrivKey[0];
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if (i2d_ECPrivateKey(pkey, &pbegin) != nSize)
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throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size");
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return vchPrivKey;
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}
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bool CKey::SetPubKey(const CPubKey& vchPubKey)
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{
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const unsigned char* pbegin = vchPubKey.begin();
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if (o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size()))
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{
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fSet = true;
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if (vchPubKey.size() == 33)
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SetCompressedPubKey();
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bool Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) {
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unsigned int nSize = ECDSA_size(pkey);
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vchSig.resize(nSize); // Make sure it is big enough
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assert(ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], &nSize, pkey));
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vchSig.resize(nSize); // Shrink to fit actual size
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return true;
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}
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pkey = NULL;
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Reset();
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return false;
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}
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CPubKey CKey::GetPubKey() const
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{
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int nSize = i2o_ECPublicKey(pkey, NULL);
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if (!nSize)
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throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
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assert(nSize <= 65);
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CPubKey ret;
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unsigned char *pbegin = ret.begin();
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if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
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throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
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assert((int)ret.size() == nSize);
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return ret;
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}
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bool CKey::Sign(uint256 hash, std::vector<unsigned char>& vchSig)
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{
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unsigned int nSize = ECDSA_size(pkey);
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vchSig.resize(nSize); // Make sure it is big enough
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if (!ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], &nSize, pkey))
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{
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vchSig.clear();
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return false;
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bool Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) {
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// -1 = error, 0 = bad sig, 1 = good
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if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1)
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return false;
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return true;
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}
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bool SignCompact(const uint256 &hash, unsigned char *p64, int &rec) {
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bool fOk = false;
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ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
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if (sig==NULL)
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return false;
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memset(p64, 0, 64);
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int nBitsR = BN_num_bits(sig->r);
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int nBitsS = BN_num_bits(sig->s);
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if (nBitsR <= 256 && nBitsS <= 256) {
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CPubKey pubkey;
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GetPubKey(pubkey, true);
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for (int i=0; i<4; i++) {
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CECKey keyRec;
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if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1) {
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CPubKey pubkeyRec;
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keyRec.GetPubKey(pubkeyRec, true);
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if (pubkeyRec == pubkey) {
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rec = i;
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fOk = true;
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break;
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}
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}
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}
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assert(fOk);
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BN_bn2bin(sig->r,&p64[32-(nBitsR+7)/8]);
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BN_bn2bin(sig->s,&p64[64-(nBitsS+7)/8]);
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}
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ECDSA_SIG_free(sig);
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return fOk;
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}
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// reconstruct public key from a compact signature
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// This is only slightly more CPU intensive than just verifying it.
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// If this function succeeds, the recovered public key is guaranteed to be valid
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// (the signature is a valid signature of the given data for that key)
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bool Recover(const uint256 &hash, const unsigned char *p64, int rec)
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{
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if (rec<0 || rec>=3)
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return false;
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ECDSA_SIG *sig = ECDSA_SIG_new();
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BN_bin2bn(&p64[0], 32, sig->r);
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BN_bin2bn(&p64[32], 32, sig->s);
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bool ret = ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), rec, 0) == 1;
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ECDSA_SIG_free(sig);
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return ret;
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}
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};
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}; // end of anonymous namespace
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bool CKey::Check(const unsigned char *vch) {
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// Do not convert to OpenSSL's data structures for range-checking keys,
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// it's easy enough to do directly.
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static const unsigned char vchMax[32] = {
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,
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0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,
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0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x40
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};
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bool fIsZero = true;
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for (int i=0; i<32 && fIsZero; i++)
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if (vch[i] != 0)
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fIsZero = false;
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if (fIsZero)
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return false;
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for (int i=0; i<32; i++) {
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if (vch[i] < vchMax[i])
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return true;
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if (vch[i] > vchMax[i])
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return false;
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}
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vchSig.resize(nSize); // Shrink to fit actual size
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return true;
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}
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// create a compact signature (65 bytes), which allows reconstructing the used public key
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// The format is one header byte, followed by two times 32 bytes for the serialized r and s values.
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// The header byte: 0x1B = first key with even y, 0x1C = first key with odd y,
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// 0x1D = second key with even y, 0x1E = second key with odd y
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bool CKey::SignCompact(uint256 hash, std::vector<unsigned char>& vchSig)
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{
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bool fOk = false;
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ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
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if (sig==NULL)
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return false;
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vchSig.clear();
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vchSig.resize(65,0);
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int nBitsR = BN_num_bits(sig->r);
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int nBitsS = BN_num_bits(sig->s);
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if (nBitsR <= 256 && nBitsS <= 256)
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{
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int nRecId = -1;
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for (int i=0; i<4; i++)
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{
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CKey keyRec;
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keyRec.fSet = true;
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if (fCompressedPubKey)
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keyRec.SetCompressedPubKey();
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if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1)
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if (keyRec.GetPubKey() == this->GetPubKey())
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{
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nRecId = i;
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break;
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}
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}
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if (nRecId == -1)
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{
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ECDSA_SIG_free(sig);
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throw key_error("CKey::SignCompact() : unable to construct recoverable key");
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}
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vchSig[0] = nRecId+27+(fCompressedPubKey ? 4 : 0);
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BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]);
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BN_bn2bin(sig->s,&vchSig[65-(nBitsS+7)/8]);
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fOk = true;
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}
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ECDSA_SIG_free(sig);
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return fOk;
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void CKey::MakeNewKey(bool fCompressedIn) {
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do {
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RAND_bytes(vch, sizeof(vch));
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} while (!Check(vch));
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fValid = true;
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fCompressed = fCompressedIn;
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}
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// reconstruct public key from a compact signature
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// This is only slightly more CPU intensive than just verifying it.
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// If this function succeeds, the recovered public key is guaranteed to be valid
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// (the signature is a valid signature of the given data for that key)
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bool CKey::SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig)
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{
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bool CKey::SetPrivKey(const CPrivKey &privkey, bool fCompressedIn) {
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CECKey key;
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if (!key.SetPrivKey(privkey))
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return false;
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key.GetSecretBytes(vch);
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fCompressed = fCompressedIn;
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fValid = true;
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return true;
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}
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CPrivKey CKey::GetPrivKey() const {
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assert(fValid);
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CECKey key;
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key.SetSecretBytes(vch);
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CPrivKey privkey;
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key.GetPrivKey(privkey);
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return privkey;
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}
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CPubKey CKey::GetPubKey() const {
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assert(fValid);
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CECKey key;
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key.SetSecretBytes(vch);
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CPubKey pubkey;
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key.GetPubKey(pubkey, fCompressed);
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return pubkey;
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}
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bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) const {
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if (!fValid)
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return false;
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CECKey key;
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key.SetSecretBytes(vch);
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return key.Sign(hash, vchSig);
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}
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bool CKey::SignCompact(const uint256 &hash, std::vector<unsigned char>& vchSig) const {
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if (!fValid)
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return false;
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CECKey key;
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key.SetSecretBytes(vch);
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vchSig.resize(65);
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int rec = -1;
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if (!key.SignCompact(hash, &vchSig[1], rec))
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return false;
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assert(rec != -1);
|
||||
vchSig[0] = 27 + rec + (fCompressed ? 4 : 0);
|
||||
return true;
|
||||
}
|
||||
|
||||
bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const {
|
||||
if (!IsValid())
|
||||
return false;
|
||||
CECKey key;
|
||||
if (!key.SetPubKey(*this))
|
||||
return false;
|
||||
if (!key.Verify(hash, vchSig))
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
bool CPubKey::RecoverCompact(const uint256 &hash, const std::vector<unsigned char>& vchSig) {
|
||||
if (vchSig.size() != 65)
|
||||
return false;
|
||||
int nV = vchSig[0];
|
||||
if (nV<27 || nV>=35)
|
||||
CECKey key;
|
||||
if (!key.Recover(hash, &vchSig[1], (vchSig[0] - 27) & ~4))
|
||||
return false;
|
||||
ECDSA_SIG *sig = ECDSA_SIG_new();
|
||||
BN_bin2bn(&vchSig[1],32,sig->r);
|
||||
BN_bin2bn(&vchSig[33],32,sig->s);
|
||||
|
||||
EC_KEY_free(pkey);
|
||||
pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
|
||||
if (nV >= 31)
|
||||
{
|
||||
SetCompressedPubKey();
|
||||
nV -= 4;
|
||||
}
|
||||
if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), nV - 27, 0) == 1)
|
||||
{
|
||||
fSet = true;
|
||||
ECDSA_SIG_free(sig);
|
||||
return true;
|
||||
}
|
||||
ECDSA_SIG_free(sig);
|
||||
return false;
|
||||
}
|
||||
|
||||
bool CKey::Verify(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)
|
||||
return false;
|
||||
|
||||
key.GetPubKey(*this, (vchSig[0] - 27) & 4);
|
||||
return true;
|
||||
}
|
||||
|
||||
bool CKey::VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig)
|
||||
{
|
||||
CKey key;
|
||||
if (!key.SetCompactSignature(hash, vchSig))
|
||||
bool CPubKey::VerifyCompact(const uint256 &hash, const std::vector<unsigned char>& vchSig) const {
|
||||
if (!IsValid())
|
||||
return false;
|
||||
if (GetPubKey() != key.GetPubKey())
|
||||
if (vchSig.size() != 65)
|
||||
return false;
|
||||
CECKey key;
|
||||
if (!key.Recover(hash, &vchSig[1], (vchSig[0] - 27) & ~4))
|
||||
return false;
|
||||
CPubKey pubkeyRec;
|
||||
key.GetPubKey(pubkeyRec, IsCompressed());
|
||||
if (*this != pubkeyRec)
|
||||
return false;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool CKey::IsValid()
|
||||
{
|
||||
if (!fSet)
|
||||
bool CPubKey::IsFullyValid() const {
|
||||
if (!IsValid())
|
||||
return false;
|
||||
|
||||
if (!EC_KEY_check_key(pkey))
|
||||
CECKey key;
|
||||
if (!key.SetPubKey(*this))
|
||||
return false;
|
||||
|
||||
bool fCompr;
|
||||
CSecret secret = GetSecret(fCompr);
|
||||
CKey key2;
|
||||
key2.SetSecret(secret, fCompr);
|
||||
return GetPubKey() == key2.GetPubKey();
|
||||
return true;
|
||||
}
|
||||
|
||||
bool CPubKey::Decompress() {
|
||||
if (!IsValid())
|
||||
return false;
|
||||
CECKey key;
|
||||
if (!key.SetPubKey(*this))
|
||||
return false;
|
||||
key.GetPubKey(*this, false);
|
||||
return true;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user