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Replace DecodeBase58/EncodeBase58 with direct implementation.

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This removes the bignum/OpenSSL dependency.

The base58 transformation code is also moved to a separate .cpp file.
This commit is contained in:
Pieter Wuille
2014-04-12 23:34:00 +02:00
parent 4a102fa9d9
commit b58be132c9
3 changed files with 101 additions and 93 deletions
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102
src/base58.h
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@@ -14,7 +14,6 @@
#ifndef BITCOIN_BASE58_H
#define BITCOIN_BASE58_H
#include "bignum.h"
#include "chainparams.h"
#include "hash.h"
#include "key.h"
@@ -27,51 +26,11 @@
#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>
/* All alphanumeric characters except for "0", "I", "O", and "l" */
static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
/**
* Encode a byte sequence as a base58-encoded string
* Encode a byte sequence as a base58-encoded string.
* pbegin and pend cannot be NULL, unless both are.
*/
inline std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend)
{
CAutoBN_CTX pctx;
CBigNum bn58 = 58;
CBigNum bn0 = 0;
// Convert big endian data to little endian - the extra zero at the end will
// ensure bignum interprets it as a positive number */
std::vector<unsigned char> vchTmp(pend-pbegin+1, 0);
reverse_copy(pbegin, pend, vchTmp.begin());
// Convert little endian data to bignum
CBigNum bn;
bn.setvch(vchTmp);
// Convert bignum to std::string
std::string str;
// The expected size increase from base58 conversion is approximately 137%,
// but use 138% to be safe
str.reserve((pend - pbegin) * 138 / 100 + 1);
CBigNum dv;
CBigNum rem;
while (bn > bn0)
{
if (!BN_div(&dv, &rem, &bn, &bn58, pctx))
throw bignum_error("EncodeBase58 : BN_div failed");
bn = dv;
unsigned int c = rem.getulong();
str += pszBase58[c];
}
// Leading zeroes encoded as base58 zeros
for (const unsigned char* p = pbegin; p < pend && *p == 0; p++)
str += pszBase58[0];
// Convert little endian std::string to big endian
reverse(str.begin(), str.end());
return str;
}
std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend);
/**
* Encode a byte vector as a base58-encoded string
@@ -82,58 +41,15 @@ inline std::string EncodeBase58(const std::vector<unsigned char>& vch)
}
/**
* Decode a base58-encoded string (psz) into a byte vector (vchRet)
* return true if decoding is successful
* Decode a base58-encoded string (psz) into a byte vector (vchRet).
* return true if decoding is successful.
* psz cannot be NULL.
*/
inline bool DecodeBase58(const char* psz, std::vector<unsigned char>& vchRet)
{
CAutoBN_CTX pctx;
vchRet.clear();
CBigNum bn58 = 58;
CBigNum bn = 0;
CBigNum bnChar;
while (isspace(*psz))
psz++;
// Convert big endian string to bignum
for (const char* p = psz; *p; p++)
{
const char* p1 = strchr(pszBase58, *p);
if (p1 == NULL)
{
while (isspace(*p))
p++;
if (*p != '\0')
return false;
break;
}
bnChar.setulong(p1 - pszBase58);
if (!BN_mul(&bn, &bn, &bn58, pctx))
throw bignum_error("DecodeBase58 : BN_mul failed");
bn += bnChar;
}
// Get bignum as little endian data
std::vector<unsigned char> vchTmp = bn.getvch();
// Trim off the sign byte if present
if (vchTmp.size() >= 2 && vchTmp.end()[-1] == 0 && vchTmp.end()[-2] >= 0x80)
vchTmp.erase(vchTmp.end()-1);
// Restore leading zeros
int nLeadingZeros = 0;
for (const char* p = psz; *p == pszBase58[0]; p++)
nLeadingZeros++;
vchRet.assign(nLeadingZeros + vchTmp.size(), 0);
// Convert little endian data to big endian
reverse_copy(vchTmp.begin(), vchTmp.end(), vchRet.end() - vchTmp.size());
return true;
}
bool DecodeBase58(const char* psz, std::vector<unsigned char>& vchRet);
/**
* Decode a base58-encoded string (str) into a byte vector (vchRet)
* return true if decoding is successful
* Decode a base58-encoded string (str) into a byte vector (vchRet).
* return true if decoding is successful.
*/
inline bool DecodeBase58(const std::string& str, std::vector<unsigned char>& vchRet)
{