[VerusCoin.git] / src / key_io.cpp

// Copyright (c) 2014-2016 The Bitcoin Core developers
// Copyright (c) 2016-2018 The Zcash developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <key_io.h>

#include <base58.h>
#include <bech32.h>
#include <script/script.h>
#include <utilstrencodings.h>

#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>

#include <assert.h>
#include <string.h>
#include <algorithm>

namespace
{
class DestinationEncoder : public boost::static_visitor<std::string>
{
private:
    const CChainParams& m_params;

public:
    DestinationEncoder(const CChainParams& params) : m_params(params) {}

    std::string operator()(const CKeyID& id) const
    {
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
        data.insert(data.end(), id.begin(), id.end());
        return EncodeBase58Check(data);
    }

    std::string operator()(const CScriptID& id) const
    {
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
        data.insert(data.end(), id.begin(), id.end());
        return EncodeBase58Check(data);
    }

    std::string operator()(const CNoDestination& no) const { return {}; }
};

CTxDestination DecodeDestination(const std::string& str, const CChainParams& params)
{
    std::vector<unsigned char> data;
    uint160 hash;
    if (DecodeBase58Check(str, data)) {
        // base58-encoded Bitcoin addresses.
        // Public-key-hash-addresses have version 0 (or 111 testnet).
        // The data vector contains RIPEMD160(SHA256(pubkey)), where pubkey is the serialized public key.
        const std::vector<unsigned char>& pubkey_prefix = params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
        if (data.size() == hash.size() + pubkey_prefix.size() && std::equal(pubkey_prefix.begin(), pubkey_prefix.end(), data.begin())) {
            std::copy(data.begin() + pubkey_prefix.size(), data.end(), hash.begin());
            return CKeyID(hash);
        }
        // Script-hash-addresses have version 5 (or 196 testnet).
        // The data vector contains RIPEMD160(SHA256(cscript)), where cscript is the serialized redemption script.
        const std::vector<unsigned char>& script_prefix = params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
        if (data.size() == hash.size() + script_prefix.size() && std::equal(script_prefix.begin(), script_prefix.end(), data.begin())) {
            std::copy(data.begin() + script_prefix.size(), data.end(), hash.begin());
            return CScriptID(hash);
        }
    }
    return CNoDestination();
}

class PaymentAddressEncoder : public boost::static_visitor<std::string>
{
private:
    const CChainParams& m_params;

public:
    PaymentAddressEncoder(const CChainParams& params) : m_params(params) {}

    std::string operator()(const libzcash::SproutPaymentAddress& zaddr) const
    {
        CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
        ss << zaddr;
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::ZCPAYMENT_ADDRRESS);
        data.insert(data.end(), ss.begin(), ss.end());
        return EncodeBase58Check(data);
    }

    std::string operator()(const libzcash::InvalidEncoding& no) const { return {}; }
};

class ViewingKeyEncoder : public boost::static_visitor<std::string>
{
private:
    const CChainParams& m_params;

public:
    ViewingKeyEncoder(const CChainParams& params) : m_params(params) {}

    std::string operator()(const libzcash::SproutViewingKey& vk) const
    {
        CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
        ss << vk;
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::ZCVIEWING_KEY);
        data.insert(data.end(), ss.begin(), ss.end());
        std::string ret = EncodeBase58Check(data);
        memory_cleanse(data.data(), data.size());
        return ret;
    }

    std::string operator()(const libzcash::InvalidEncoding& no) const { return {}; }
};

class SpendingKeyEncoder : public boost::static_visitor<std::string>
{
private:
    const CChainParams& m_params;

public:
    SpendingKeyEncoder(const CChainParams& params) : m_params(params) {}

    std::string operator()(const libzcash::SproutSpendingKey& zkey) const
    {
        CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
        ss << zkey;
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::ZCSPENDING_KEY);
        data.insert(data.end(), ss.begin(), ss.end());
        std::string ret = EncodeBase58Check(data);
        memory_cleanse(data.data(), data.size());
        return ret;
    }

    std::string operator()(const libzcash::InvalidEncoding& no) const { return {}; }
};
} // namespace

CKey DecodeSecret(const std::string& str)
{
    CKey key;
    std::vector<unsigned char> data;
    if (DecodeBase58Check(str, data)) {
        const std::vector<unsigned char>& privkey_prefix = Params().Base58Prefix(CChainParams::SECRET_KEY);
        if ((data.size() == 32 + privkey_prefix.size() || (data.size() == 33 + privkey_prefix.size() && data.back() == 1)) &&
            std::equal(privkey_prefix.begin(), privkey_prefix.end(), data.begin())) {
            bool compressed = data.size() == 33 + privkey_prefix.size();
            key.Set(data.begin() + privkey_prefix.size(), data.begin() + privkey_prefix.size() + 32, compressed);
        }
    }
    memory_cleanse(data.data(), data.size());
    return key;
}

std::string EncodeSecret(const CKey& key)
{
    assert(key.IsValid());
    std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::SECRET_KEY);
    data.insert(data.end(), key.begin(), key.end());
    if (key.IsCompressed()) {
        data.push_back(1);
    }
    std::string ret = EncodeBase58Check(data);
    memory_cleanse(data.data(), data.size());
    return ret;
}

CExtPubKey DecodeExtPubKey(const std::string& str)
{
    CExtPubKey key;
    std::vector<unsigned char> data;
    if (DecodeBase58Check(str, data)) {
        const std::vector<unsigned char>& prefix = Params().Base58Prefix(CChainParams::EXT_PUBLIC_KEY);
        if (data.size() == BIP32_EXTKEY_SIZE + prefix.size() && std::equal(prefix.begin(), prefix.end(), data.begin())) {
            key.Decode(data.data() + prefix.size());
        }
    }
    return key;
}

std::string EncodeExtPubKey(const CExtPubKey& key)
{
    std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::EXT_PUBLIC_KEY);
    size_t size = data.size();
    data.resize(size + BIP32_EXTKEY_SIZE);
    key.Encode(data.data() + size);
    std::string ret = EncodeBase58Check(data);
    return ret;
}

CExtKey DecodeExtKey(const std::string& str)
{
    CExtKey key;
    std::vector<unsigned char> data;
    if (DecodeBase58Check(str, data)) {
        const std::vector<unsigned char>& prefix = Params().Base58Prefix(CChainParams::EXT_SECRET_KEY);
        if (data.size() == BIP32_EXTKEY_SIZE + prefix.size() && std::equal(prefix.begin(), prefix.end(), data.begin())) {
            key.Decode(data.data() + prefix.size());
        }
    }
    return key;
}

std::string EncodeExtKey(const CExtKey& key)
{
    std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::EXT_SECRET_KEY);
    size_t size = data.size();
    data.resize(size + BIP32_EXTKEY_SIZE);
    key.Encode(data.data() + size);
    std::string ret = EncodeBase58Check(data);
    memory_cleanse(data.data(), data.size());
    return ret;
}

std::string EncodeDestination(const CTxDestination& dest)
{
    return boost::apply_visitor(DestinationEncoder(Params()), dest);
}

CTxDestination DecodeDestination(const std::string& str)
{
    return DecodeDestination(str, Params());
}

bool IsValidDestinationString(const std::string& str, const CChainParams& params)
{
    return IsValidDestination(DecodeDestination(str, params));
}

bool IsValidDestinationString(const std::string& str)
{
    return IsValidDestinationString(str, Params());
}

std::string EncodePaymentAddress(const libzcash::PaymentAddress& zaddr)
{
    return boost::apply_visitor(PaymentAddressEncoder(Params()), zaddr);
}

libzcash::PaymentAddress DecodePaymentAddress(const std::string& str)
{
    std::vector<unsigned char> data;
    if (DecodeBase58Check(str, data)) {
        const std::vector<unsigned char>& zaddr_prefix = Params().Base58Prefix(CChainParams::ZCPAYMENT_ADDRRESS);
        if ((data.size() == libzcash::SerializedPaymentAddressSize + zaddr_prefix.size()) &&
            std::equal(zaddr_prefix.begin(), zaddr_prefix.end(), data.begin())) {
            CSerializeData serialized(data.begin() + zaddr_prefix.size(), data.end());
            CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
            libzcash::SproutPaymentAddress ret;
            ss >> ret;
            return ret;
        }
    }
    return libzcash::InvalidEncoding();
}

bool IsValidPaymentAddressString(const std::string& str) {
    return IsValidPaymentAddress(DecodePaymentAddress(str));
}

std::string EncodeViewingKey(const libzcash::ViewingKey& vk)
{
    return boost::apply_visitor(ViewingKeyEncoder(Params()), vk);
}

libzcash::ViewingKey DecodeViewingKey(const std::string& str)
{
    std::vector<unsigned char> data;
    if (DecodeBase58Check(str, data)) {
        const std::vector<unsigned char>& vk_prefix = Params().Base58Prefix(CChainParams::ZCVIEWING_KEY);
        if ((data.size() == libzcash::SerializedViewingKeySize + vk_prefix.size()) &&
            std::equal(vk_prefix.begin(), vk_prefix.end(), data.begin())) {
            CSerializeData serialized(data.begin() + vk_prefix.size(), data.end());
            CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
            libzcash::SproutViewingKey ret;
            ss >> ret;
            memory_cleanse(serialized.data(), serialized.size());
            memory_cleanse(data.data(), data.size());
            return ret;
        }
    }
    memory_cleanse(data.data(), data.size());
    return libzcash::InvalidEncoding();
}

std::string EncodeSpendingKey(const libzcash::SpendingKey& zkey)
{
    return boost::apply_visitor(SpendingKeyEncoder(Params()), zkey);
}

libzcash::SpendingKey DecodeSpendingKey(const std::string& str)
{
    std::vector<unsigned char> data;
    if (DecodeBase58Check(str, data)) {
        const std::vector<unsigned char>& zkey_prefix = Params().Base58Prefix(CChainParams::ZCSPENDING_KEY);
        if ((data.size() == libzcash::SerializedSpendingKeySize + zkey_prefix.size()) &&
            std::equal(zkey_prefix.begin(), zkey_prefix.end(), data.begin())) {
            CSerializeData serialized(data.begin() + zkey_prefix.size(), data.end());
            CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
            libzcash::SproutSpendingKey ret;
            ss >> ret;
            memory_cleanse(serialized.data(), serialized.size());
            memory_cleanse(data.data(), data.size());
            return ret;
        }
    }
    memory_cleanse(data.data(), data.size());
    return libzcash::InvalidEncoding();
}
Commit	Line	Data
3d31e09c PW	1	// Copyright (c) 2014-2016 The Bitcoin Core developers
	2	// Copyright (c) 2016-2018 The Zcash developers
	3	// Distributed under the MIT software license, see the accompanying
	4	// file COPYING or http://www.opensource.org/licenses/mit-license.php.
	5
	6	#include <key_io.h>
	7
	8	#include <base58.h>
	9	#include <bech32.h>
	10	#include <script/script.h>
	11	#include <utilstrencodings.h>
	12
	13	#include <boost/variant/apply_visitor.hpp>
	14	#include <boost/variant/static_visitor.hpp>
	15
	16	#include <assert.h>
	17	#include <string.h>
	18	#include <algorithm>
	19
	20	namespace
	21	{
	22	class DestinationEncoder : public boost::static_visitor<std::string>
	23	{
	24	private:
	25	const CChainParams& m_params;
	26
	27	public:
	28	DestinationEncoder(const CChainParams& params) : m_params(params) {}
	29
	30	std::string operator()(const CKeyID& id) const
	31	{
	32	std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
	33	data.insert(data.end(), id.begin(), id.end());
	34	return EncodeBase58Check(data);
	35	}
	36
	37	std::string operator()(const CScriptID& id) const
	38	{
	39	std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
	40	data.insert(data.end(), id.begin(), id.end());
	41	return EncodeBase58Check(data);
	42	}
	43
	44	std::string operator()(const CNoDestination& no) const { return {}; }
	45	};
	46
	47	CTxDestination DecodeDestination(const std::string& str, const CChainParams& params)
	48	{
	49	std::vector<unsigned char> data;
	50	uint160 hash;
	51	if (DecodeBase58Check(str, data)) {
	52	// base58-encoded Bitcoin addresses.
	53	// Public-key-hash-addresses have version 0 (or 111 testnet).
	54	// The data vector contains RIPEMD160(SHA256(pubkey)), where pubkey is the serialized public key.
	55	const std::vector<unsigned char>& pubkey_prefix = params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
	56	if (data.size() == hash.size() + pubkey_prefix.size() && std::equal(pubkey_prefix.begin(), pubkey_prefix.end(), data.begin())) {
	57	std::copy(data.begin() + pubkey_prefix.size(), data.end(), hash.begin());
	58	return CKeyID(hash);
	59	}
	60	// Script-hash-addresses have version 5 (or 196 testnet).
	61	// The data vector contains RIPEMD160(SHA256(cscript)), where cscript is the serialized redemption script.
	62	const std::vector<unsigned char>& script_prefix = params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
	63	if (data.size() == hash.size() + script_prefix.size() && std::equal(script_prefix.begin(), script_prefix.end(), data.begin())) {
	64	std::copy(data.begin() + script_prefix.size(), data.end(), hash.begin());
65	return CScriptID(hash);
66	}
67	}
68	return CNoDestination();
69	}
e5eab182 JG	70
	71	class PaymentAddressEncoder : public boost::static_visitor<std::string>
	72	{
	73	private:
	74	const CChainParams& m_params;
	75
	76	public:
	77	PaymentAddressEncoder(const CChainParams& params) : m_params(params) {}
	78
	79	std::string operator()(const libzcash::SproutPaymentAddress& zaddr) const
	80	{
	81	CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
	82	ss << zaddr;
	83	std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::ZCPAYMENT_ADDRRESS);
	84	data.insert(data.end(), ss.begin(), ss.end());
	85	return EncodeBase58Check(data);
	86	}
	87
	88	std::string operator()(const libzcash::InvalidEncoding& no) const { return {}; }
	89	};
	90
	91	class ViewingKeyEncoder : public boost::static_visitor<std::string>
	92	{
	93	private:
	94	const CChainParams& m_params;
	95
	96	public:
	97	ViewingKeyEncoder(const CChainParams& params) : m_params(params) {}
	98
	99	std::string operator()(const libzcash::SproutViewingKey& vk) const
	100	{
	101	CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
	102	ss << vk;
	103	std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::ZCVIEWING_KEY);
	104	data.insert(data.end(), ss.begin(), ss.end());
	105	std::string ret = EncodeBase58Check(data);
	106	memory_cleanse(data.data(), data.size());
	107	return ret;
	108	}
	109
	110	std::string operator()(const libzcash::InvalidEncoding& no) const { return {}; }
	111	};
	112
	113	class SpendingKeyEncoder : public boost::static_visitor<std::string>
	114	{
	115	private:
	116	const CChainParams& m_params;
	117
	118	public:
	119	SpendingKeyEncoder(const CChainParams& params) : m_params(params) {}
	120
	121	std::string operator()(const libzcash::SproutSpendingKey& zkey) const
	122	{
	123	CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
	124	ss << zkey;
	125	std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::ZCSPENDING_KEY);
	126	data.insert(data.end(), ss.begin(), ss.end());
	127	std::string ret = EncodeBase58Check(data);
	128	memory_cleanse(data.data(), data.size());
	129	return ret;
	130	}
	131
	132	std::string operator()(const libzcash::InvalidEncoding& no) const { return {}; }
	133	};
3d31e09c PW	134	} // namespace
	135
	136	CKey DecodeSecret(const std::string& str)
	137	{
	138	CKey key;
	139	std::vector<unsigned char> data;
	140	if (DecodeBase58Check(str, data)) {
	141	const std::vector<unsigned char>& privkey_prefix = Params().Base58Prefix(CChainParams::SECRET_KEY);
	142	if ((data.size() == 32 + privkey_prefix.size() \|\| (data.size() == 33 + privkey_prefix.size() && data.back() == 1)) &&
	143	std::equal(privkey_prefix.begin(), privkey_prefix.end(), data.begin())) {
	144	bool compressed = data.size() == 33 + privkey_prefix.size();
	145	key.Set(data.begin() + privkey_prefix.size(), data.begin() + privkey_prefix.size() + 32, compressed);
	146	}
	147	}
	148	memory_cleanse(data.data(), data.size());
	149	return key;
	150	}
	151
	152	std::string EncodeSecret(const CKey& key)
	153	{
	154	assert(key.IsValid());
	155	std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::SECRET_KEY);
	156	data.insert(data.end(), key.begin(), key.end());
	157	if (key.IsCompressed()) {
	158	data.push_back(1);
	159	}
	160	std::string ret = EncodeBase58Check(data);
	161	memory_cleanse(data.data(), data.size());
	162	return ret;
	163	}
	164
	165	CExtPubKey DecodeExtPubKey(const std::string& str)
	166	{
	167	CExtPubKey key;
	168	std::vector<unsigned char> data;
	169	if (DecodeBase58Check(str, data)) {
	170	const std::vector<unsigned char>& prefix = Params().Base58Prefix(CChainParams::EXT_PUBLIC_KEY);
	171	if (data.size() == BIP32_EXTKEY_SIZE + prefix.size() && std::equal(prefix.begin(), prefix.end(), data.begin())) {
	172	key.Decode(data.data() + prefix.size());
	173	}
	174	}
	175	return key;
	176	}
	177
	178	std::string EncodeExtPubKey(const CExtPubKey& key)
	179	{
	180	std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::EXT_PUBLIC_KEY);
	181	size_t size = data.size();
	182	data.resize(size + BIP32_EXTKEY_SIZE);
	183	key.Encode(data.data() + size);
	184	std::string ret = EncodeBase58Check(data);
	185	return ret;
	186	}
	187
	188	CExtKey DecodeExtKey(const std::string& str)
	189	{
	190	CExtKey key;
	191	std::vector<unsigned char> data;
	192	if (DecodeBase58Check(str, data)) {
	193	const std::vector<unsigned char>& prefix = Params().Base58Prefix(CChainParams::EXT_SECRET_KEY);
	194	if (data.size() == BIP32_EXTKEY_SIZE + prefix.size() && std::equal(prefix.begin(), prefix.end(), data.begin())) {
	195	key.Decode(data.data() + prefix.size());
	196	}
	197	}
198	return key;
199	}
200
201	std::string EncodeExtKey(const CExtKey& key)
202	{
203	std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::EXT_SECRET_KEY);
204	size_t size = data.size();
205	data.resize(size + BIP32_EXTKEY_SIZE);
206	key.Encode(data.data() + size);
207	std::string ret = EncodeBase58Check(data);
208	memory_cleanse(data.data(), data.size());
209	return ret;
210	}
211
212	std::string EncodeDestination(const CTxDestination& dest)
213	{
214	return boost::apply_visitor(DestinationEncoder(Params()), dest);
215	}
216
217	CTxDestination DecodeDestination(const std::string& str)
218	{
219	return DecodeDestination(str, Params());
220	}
221
222	bool IsValidDestinationString(const std::string& str, const CChainParams& params)
223	{
224	return IsValidDestination(DecodeDestination(str, params));
225	}
226
227	bool IsValidDestinationString(const std::string& str)
228	{
229	return IsValidDestinationString(str, Params());
230	}
231
232	std::string EncodePaymentAddress(const libzcash::PaymentAddress& zaddr)
233	{
e5eab182	234	return boost::apply_visitor(PaymentAddressEncoder(Params()), zaddr);
3d31e09c PW	235	}
3d31e09c PW	236
e5eab182	237	libzcash::PaymentAddress DecodePaymentAddress(const std::string& str)
3d31e09c PW	238	{
	239	std::vector<unsigned char> data;
	240	if (DecodeBase58Check(str, data)) {
	241	const std::vector<unsigned char>& zaddr_prefix = Params().Base58Prefix(CChainParams::ZCPAYMENT_ADDRRESS);
	242	if ((data.size() == libzcash::SerializedPaymentAddressSize + zaddr_prefix.size()) &&
	243	std::equal(zaddr_prefix.begin(), zaddr_prefix.end(), data.begin())) {
	244	CSerializeData serialized(data.begin() + zaddr_prefix.size(), data.end());
	245	CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
e5eab182	246	libzcash::SproutPaymentAddress ret;
3d31e09c PW	247	ss >> ret;
	248	return ret;
	249	}
	250	}
e5eab182 JG	251	return libzcash::InvalidEncoding();
	252	}
	253
	254	bool IsValidPaymentAddressString(const std::string& str) {
	255	return IsValidPaymentAddress(DecodePaymentAddress(str));
3d31e09c PW	256	}
	257
	258	std::string EncodeViewingKey(const libzcash::ViewingKey& vk)
	259	{
e5eab182	260	return boost::apply_visitor(ViewingKeyEncoder(Params()), vk);
3d31e09c PW	261	}
3d31e09c PW	262
e5eab182	263	libzcash::ViewingKey DecodeViewingKey(const std::string& str)
3d31e09c PW	264	{
	265	std::vector<unsigned char> data;
	266	if (DecodeBase58Check(str, data)) {
	267	const std::vector<unsigned char>& vk_prefix = Params().Base58Prefix(CChainParams::ZCVIEWING_KEY);
	268	if ((data.size() == libzcash::SerializedViewingKeySize + vk_prefix.size()) &&
	269	std::equal(vk_prefix.begin(), vk_prefix.end(), data.begin())) {
	270	CSerializeData serialized(data.begin() + vk_prefix.size(), data.end());
	271	CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
e5eab182	272	libzcash::SproutViewingKey ret;
3d31e09c PW	273	ss >> ret;
	274	memory_cleanse(serialized.data(), serialized.size());
	275	memory_cleanse(data.data(), data.size());
	276	return ret;
	277	}
	278	}
	279	memory_cleanse(data.data(), data.size());
e5eab182	280	return libzcash::InvalidEncoding();
3d31e09c PW	281	}
	282
	283	std::string EncodeSpendingKey(const libzcash::SpendingKey& zkey)
	284	{
e5eab182	285	return boost::apply_visitor(SpendingKeyEncoder(Params()), zkey);
3d31e09c PW	286	}
3d31e09c PW	287
e5eab182	288	libzcash::SpendingKey DecodeSpendingKey(const std::string& str)
3d31e09c PW	289	{
	290	std::vector<unsigned char> data;
	291	if (DecodeBase58Check(str, data)) {
	292	const std::vector<unsigned char>& zkey_prefix = Params().Base58Prefix(CChainParams::ZCSPENDING_KEY);
	293	if ((data.size() == libzcash::SerializedSpendingKeySize + zkey_prefix.size()) &&
	294	std::equal(zkey_prefix.begin(), zkey_prefix.end(), data.begin())) {
	295	CSerializeData serialized(data.begin() + zkey_prefix.size(), data.end());
	296	CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
e5eab182	297	libzcash::SproutSpendingKey ret;
3d31e09c PW	298	ss >> ret;
	299	memory_cleanse(serialized.data(), serialized.size());
	300	memory_cleanse(data.data(), data.size());
	301	return ret;
	302	}
	303	}
	304	memory_cleanse(data.data(), data.size());
e5eab182	305	return libzcash::InvalidEncoding();
3d31e09c	306	}