1 files changed, 131 insertions, 0 deletions
diff --git a/src/pubkey.cpp b/src/pubkey.cpp
new file mode 100644
index 0000000000..3f16a4b4be
--- /dev/null
+++ b/src/pubkey.cpp
@@ -0,0 +1,131 @@
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "pubkey.h"
+
+#include "crypto/sha2.h"
+#include "eccryptoverify.h"
+
+#ifdef USE_SECP256K1
+#include <secp256k1.h>
+#else
+#include "ecwrapper.h"
+#endif
+
+bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const {
+    if (!IsValid())
+        return false;
+#ifdef USE_SECP256K1
+    if (secp256k1_ecdsa_verify((const unsigned char*)&hash, 32, &vchSig[0], vchSig.size(), begin(), size()) != 1)
+        return false;
+#else
+    CECKey key;
+    if (!key.SetPubKey(begin(), size()))
+        return false;
+    if (!key.Verify(hash, vchSig))
+        return false;
+#endif
+    return true;
+}
+
+bool CPubKey::RecoverCompact(const uint256 &hash, const std::vector<unsigned char>& vchSig) {
+    if (vchSig.size() != 65)
+        return false;
+    int recid = (vchSig[0] - 27) & 3;
+    bool fComp = ((vchSig[0] - 27) & 4) != 0;
+#ifdef USE_SECP256K1
+    int pubkeylen = 65;
+    if (!secp256k1_ecdsa_recover_compact((const unsigned char*)&hash, 32, &vchSig[1], (unsigned char*)begin(), &pubkeylen, fComp, recid))
+        return false;
+    assert((int)size() == pubkeylen);
+#else
+    CECKey key;
+    if (!key.Recover(hash, &vchSig[1], recid))
+        return false;
+    std::vector<unsigned char> pubkey;
+    key.GetPubKey(pubkey, fComp);
+    Set(pubkey.begin(), pubkey.end());
+#endif
+    return true;
+}
+
+bool CPubKey::IsFullyValid() const {
+    if (!IsValid())
+        return false;
+#ifdef USE_SECP256K1
+    if (!secp256k1_ecdsa_pubkey_verify(begin(), size()))
+        return false;
+#else
+    CECKey key;
+    if (!key.SetPubKey(begin(), size()))
+        return false;
+#endif
+    return true;
+}
+
+bool CPubKey::Decompress() {
+    if (!IsValid())
+        return false;
+#ifdef USE_SECP256K1
+    int clen = size();
+    int ret = secp256k1_ecdsa_pubkey_decompress((unsigned char*)begin(), &clen);
+    assert(ret);
+    assert(clen == (int)size());
+#else
+    CECKey key;
+    if (!key.SetPubKey(begin(), size()))
+        return false;
+    std::vector<unsigned char> pubkey;
+    key.GetPubKey(pubkey, false);
+    Set(pubkey.begin(), pubkey.end());
+#endif
+    return true;
+}
+
+bool CPubKey::Derive(CPubKey& pubkeyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const {
+    assert(IsValid());
+    assert((nChild >> 31) == 0);
+    assert(begin() + 33 == end());
+    unsigned char out[64];
+    BIP32Hash(cc, nChild, *begin(), begin()+1, out);
+    memcpy(ccChild, out+32, 32);
+#ifdef USE_SECP256K1
+    pubkeyChild = *this;
+    bool ret = secp256k1_ecdsa_pubkey_tweak_add((unsigned char*)pubkeyChild.begin(), pubkeyChild.size(), out);
+#else
+    CECKey key;
+    bool ret = key.SetPubKey(begin(), size());
+    ret &= key.TweakPublic(out);
+    std::vector<unsigned char> pubkey;
+    key.GetPubKey(pubkey, true);
+    pubkeyChild.Set(pubkey.begin(), pubkey.end());
+#endif
+    return ret;
+}
+
+void CExtPubKey::Encode(unsigned char code[74]) const {
+    code[0] = nDepth;
+    memcpy(code+1, vchFingerprint, 4);
+    code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF;
+    code[7] = (nChild >>  8) & 0xFF; code[8] = (nChild >>  0) & 0xFF;
+    memcpy(code+9, vchChainCode, 32);
+    assert(pubkey.size() == 33);
+    memcpy(code+41, pubkey.begin(), 33);
+}
+
+void CExtPubKey::Decode(const unsigned char code[74]) {
+    nDepth = code[0];
+    memcpy(vchFingerprint, code+1, 4);
+    nChild = (code[5] << 24) | (code[6] << 16) | (code[7] << 8) | code[8];
+    memcpy(vchChainCode, code+9, 32);
+    pubkey.Set(code+41, code+74);
+}
+
+bool CExtPubKey::Derive(CExtPubKey &out, unsigned int nChild) const {
+    out.nDepth = nDepth + 1;
+    CKeyID id = pubkey.GetID();
+    memcpy(&out.vchFingerprint[0], &id, 4);
+    out.nChild = nChild;
+    return pubkey.Derive(out.pubkey, out.vchChainCode, nChild, vchChainCode);
+}