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Prepare codebase for Encrypted Keys.

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This commit is contained in:
Pieter Wuille
2011-06-25 14:57:32 +02:00
committed by Matt Corallo
parent e94010b239
commit acd6501610
9 changed files with 274 additions and 29 deletions
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70
src/key.h
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@@ -31,6 +31,41 @@
// see www.keylength.com
// script supports up to 75 for single byte push
int static inline EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
{
int ok = 0;
BN_CTX *ctx = NULL;
EC_POINT *pub_key = NULL;
if (!eckey) return 0;
const EC_GROUP *group = EC_KEY_get0_group(eckey);
if ((ctx = BN_CTX_new()) == NULL)
goto err;
pub_key = EC_POINT_new(group);
if (pub_key == NULL)
goto err;
if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx))
goto err;
EC_KEY_set_private_key(eckey,priv_key);
EC_KEY_set_public_key(eckey,pub_key);
ok = 1;
err:
if (pub_key)
EC_POINT_free(pub_key);
if (ctx != NULL)
BN_CTX_free(ctx);
return(ok);
}
class key_error : public std::runtime_error
@@ -42,8 +77,7 @@ public:
// secure_allocator is defined in serialize.h
typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
typedef std::vector<unsigned char, secure_allocator<unsigned char> > CSecret;
class CKey
{
@@ -102,6 +136,38 @@ public:
return true;
}
bool SetSecret(const CSecret& vchSecret)
{
EC_KEY_free(pkey);
pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
if (pkey == NULL)
throw key_error("CKey::SetSecret() : EC_KEY_new_by_curve_name failed");
if (vchSecret.size() != 32)
throw key_error("CKey::SetSecret() : secret must be 32 bytes");
BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new());
if (bn == NULL)
throw key_error("CKey::SetSecret() : BN_bin2bn failed");
if (!EC_KEY_regenerate_key(pkey,bn))
throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
BN_clear_free(bn);
fSet = true;
return true;
}
CSecret GetSecret() const
{
CSecret vchRet;
vchRet.resize(32);
const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
int nBytes = BN_num_bytes(bn);
if (bn == NULL)
throw key_error("CKey::GetSecret() : EC_KEY_get0_private_key failed");
int n=BN_bn2bin(bn,&vchRet[32 - nBytes]);
if (n != nBytes)
throw key_error("CKey::GetSecret(): BN_bn2bin failed");
return vchRet;
}
CPrivKey GetPrivKey() const
{
unsigned int nSize = i2d_ECPrivateKey(pkey, NULL);