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bitcoin/base58: p2sh address support.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2016-01-22 06:41:46 +10:30
parent 2516a187bc
commit 04fd2c861f
2 changed files with 65 additions and 18 deletions
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76
bitcoin/base58.c
View File

@ -140,30 +140,39 @@ void base58_get_checksum(u8 csum[4], const u8 buf[], size_t buflen)
memcpy(csum, sha_result.sha.u.u8, 4);
}
char *bitcoin_to_base58(const tal_t *ctx, bool test_net,
const struct bitcoin_address *addr)
static char *to_base58(const tal_t *ctx, u8 version,
const struct ripemd160 *rmd)
{
u8 buf[1 + sizeof(addr->addr) + 4];
u8 buf[1 + sizeof(*rmd) + 4];
char out[BASE58_ADDR_MAX_LEN + 2], *p;
buf[0] = test_net ? 111 : 0;
BUILD_ASSERT(sizeof(addr->addr) == sizeof(struct ripemd160));
memcpy(buf+1, addr, sizeof(addr->addr));
buf[0] = version;
memcpy(buf+1, rmd, sizeof(*rmd));
/* Append checksum */
base58_get_checksum(buf + 1 + sizeof(addr->addr),
buf, 1 + sizeof(addr->addr));
base58_get_checksum(buf + 1 + sizeof(*rmd), buf, 1 + sizeof(*rmd));
p = encode_base58(out, BASE58_ADDR_MAX_LEN, buf, sizeof(buf));
return tal_strdup(ctx, p);
}
bool bitcoin_from_base58(bool *test_net,
struct bitcoin_address *addr,
const char *base58, size_t base58_len)
char *bitcoin_to_base58(const tal_t *ctx, bool test_net,
const struct bitcoin_address *addr)
{
u8 buf[1 + sizeof(addr->addr) + 4];
return to_base58(ctx, test_net ? 111 : 0, &addr->addr);
}
char *p2sh_to_base58(const tal_t *ctx, bool test_net,
const struct ripemd160 *p2sh)
{
return to_base58(ctx, test_net ? 196 : 5, p2sh);
}
static bool from_base58(u8 *version,
struct ripemd160 *rmd,
const char *base58, size_t base58_len)
{
u8 buf[1 + sizeof(*rmd) + 4];
BIGNUM bn;
size_t len;
u8 csum[4];
@ -180,18 +189,49 @@ bool bitcoin_from_base58(bool *test_net,
BN_bn2bin(&bn, buf + sizeof(buf) - len);
BN_free(&bn);
if (buf[0] == 111)
*version = buf[0];
base58_get_checksum(csum, buf, 1 + sizeof(*rmd));
if (memcmp(csum, buf + 1 + sizeof(*rmd), sizeof(csum)) != 0)
return false;
memcpy(rmd, buf+1, sizeof(*rmd));
return true;
}
bool bitcoin_from_base58(bool *test_net,
struct bitcoin_address *addr,
const char *base58, size_t len)
{
u8 version;
if (!from_base58(&version, &addr->addr, base58, len))
return false;
if (version == 111)
*test_net = true;
else if (buf[0] == 0)
else if (version == 0)
*test_net = false;
else
return false;
return true;
}
base58_get_checksum(csum, buf, 1 + sizeof(addr->addr));
if (memcmp(csum, buf + 1 + sizeof(addr->addr), sizeof(csum)) != 0)
bool p2sh_from_base58(bool *test_net,
struct ripemd160 *p2sh,
const char *base58, size_t len)
{
u8 version;
if (!from_base58(&version, p2sh, base58, len))
return false;
memcpy(&addr->addr, buf+1, sizeof(addr->addr));
if (version == 196)
*test_net = true;
else if (version == 5)
*test_net = false;
else
return false;
return true;
}

7
bitcoin/base58.h
View File

@ -31,6 +31,13 @@ bool bitcoin_from_base58(bool *test_net,
struct bitcoin_address *addr,
const char *base58, size_t len);
/* P2SH address encoded as base58, with version and checksum */
char *p2sh_to_base58(const tal_t *ctx, bool test_net,
const struct ripemd160 *p2sh);
bool p2sh_from_base58(bool *test_net,
struct ripemd160 *p2sh,
const char *base58, size_t len);
bool ripemd_from_base58(u8 *version, struct ripemd160 *ripemd160,
const char *base58);