#include <openssl/ecdsa.h>
#include <openssl/evp.h>
-#include <openssl/obj_mac.h>
#include "key.h"
#include "base58.h"
x = BN_CTX_get(ctx);
if (!BN_copy(x, order)) { ret=-1; goto err; }
if (!BN_mul_word(x, i)) { ret=-1; goto err; }
- if (!BN_add(x, x, ecsig->r)) { ret=-1; goto err; }
+
+ // Get internal R and S pointers
+ const BIGNUM *ecsig_r, *ecsig_s;
+ ECDSA_SIG_get0(ecsig, &ecsig_r, &ecsig_s);
+
+ if (!BN_add(x, x, ecsig_r)) { ret=-1; goto err; }
field = BN_CTX_get(ctx);
if (!EC_GROUP_get_curve_GFp(group, field, NULL, NULL, ctx)) { ret=-2; goto err; }
if (BN_cmp(x, field) >= 0) { ret=0; goto err; }
if (!BN_bin2bn(msg, msglen, e)) { ret=-1; goto err; }
if (8*msglen > n) BN_rshift(e, e, 8-(n & 7));
zero = BN_CTX_get(ctx);
- if (!BN_zero(zero)) { ret=-1; goto err; }
+ if (!BN_set_word(zero, 0)) { ret=-1; goto err; }
if (!BN_mod_sub(e, zero, e, order, ctx)) { ret=-1; goto err; }
rr = BN_CTX_get(ctx);
- if (!BN_mod_inverse(rr, ecsig->r, order, ctx)) { ret=-1; goto err; }
+ if (!BN_mod_inverse(rr, ecsig_r, order, ctx)) { ret=-1; goto err; }
sor = BN_CTX_get(ctx);
- if (!BN_mod_mul(sor, ecsig->s, rr, order, ctx)) { ret=-1; goto err; }
+ if (!BN_mod_mul(sor, ecsig_s, rr, order, ctx)) { ret=-1; goto err; }
eor = BN_CTX_get(ctx);
if (!BN_mod_mul(eor, e, rr, order, ctx)) { ret=-1; goto err; }
if (!EC_POINT_mul(group, Q, eor, R, sor, ctx)) { ret=-2; goto err; }
void CKey::SetCompressedPubKey(bool fCompressed)
{
EC_KEY_set_conv_form(pkey, fCompressed ? POINT_CONVERSION_COMPRESSED : POINT_CONVERSION_UNCOMPRESSED);
- fCompressedPubKey = fCompressed;
}
void CKey::Reset()
{
- fCompressedPubKey = fSet = false;
+ fSet = false;
if (pkey != NULL)
EC_KEY_free(pkey);
pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
if (pkey == NULL)
throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
fSet = b.fSet;
- fCompressedPubKey = b.fCompressedPubKey;
}
CKey::CKey(const CSecret& b, bool fCompressed)
if (!EC_KEY_copy(pkey, b.pkey))
throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
fSet = b.fSet;
- fCompressedPubKey = b.fCompressedPubKey;
return (*this);
}
bool CKey::IsCompressed() const
{
- return fCompressedPubKey;
+ return (EC_KEY_get_conv_form(pkey) == POINT_CONVERSION_COMPRESSED);
}
bool CKey::CheckSignatureElement(const unsigned char *vch, int len, bool half) {
int n=BN_bn2bin(bn,&vchRet[32 - nBytes]);
if (n != nBytes)
throw key_error("CKey::GetSecret(): BN_bn2bin failed");
- fCompressed = fCompressedPubKey;
+ fCompressed = IsCompressed();
return vchRet;
}
-bool CKey::WritePEM(BIO *streamObj, const SecureString &strPassKey) const // dumppem 4KJLA99FyqMMhjjDe7KnRXK4sjtv9cCtNS /tmp/test.pem 123
-{
- EVP_PKEY *evpKey = EVP_PKEY_new();
- if (!EVP_PKEY_assign_EC_KEY(evpKey, pkey))
- return error("CKey::WritePEM() : Error initializing EVP_PKEY instance.");
- if(!PEM_write_bio_PKCS8PrivateKey(streamObj, evpKey, EVP_aes_256_cbc(), (char *)&strPassKey[0], strPassKey.size(), NULL, NULL))
- return error("CKey::WritePEM() : Error writing private key data to stream object");
-
- return true;
-}
-
CSecret CKey::GetSecret() const
{
bool fCompressed;
if (sig==NULL)
return false;
const EC_GROUP *group = EC_KEY_get0_group(pkey);
- CBigNum order, halforder;
- EC_GROUP_get_order(group, &order, NULL);
- BN_rshift1(&halforder, &order);
+
+ BIGNUM* order = BN_new(), *halforder = BN_new();
+ EC_GROUP_get_order(group, order, NULL);
+ BN_rshift1(halforder, order);
+
+ // Get internal R and S pointers
+ const BIGNUM *current_s = ECDSA_SIG_get0_s(sig);
+
// enforce low S values, by negating the value (modulo the order) if above order/2.
- if (BN_cmp(sig->s, &halforder) > 0) {
- BN_sub(sig->s, &order, sig->s);
+ if (BN_cmp(current_s, halforder) > 0) {
+ BIGNUM *updated_s = BN_new();
+ BN_copy(updated_s, current_s);
+ BN_sub(updated_s, order, updated_s);
+ ECDSA_SIG_set0(sig, NULL, updated_s);
}
+
+ BN_free(order);
+ BN_free(halforder);
+
unsigned int nSize = ECDSA_size(pkey);
vchSig.resize(nSize); // Make sure it is big enough
unsigned char *pos = &vchSig[0];
if (sig==NULL)
return false;
const EC_GROUP *group = EC_KEY_get0_group(pkey);
- CBigNum order, halforder;
- EC_GROUP_get_order(group, &order, NULL);
- BN_rshift1(&halforder, &order);
+ BIGNUM* order = BN_new(), *halforder = BN_new();
+ EC_GROUP_get_order(group, order, NULL);
+ BN_rshift1(halforder, order);
+
+ // Get internal R and S pointers
+ const BIGNUM *current_s = ECDSA_SIG_get0_s(sig);
+
// enforce low S values, by negating the value (modulo the order) if above order/2.
- if (BN_cmp(sig->s, &halforder) > 0) {
- BN_sub(sig->s, &order, sig->s);
+ if (BN_cmp(current_s, halforder) > 0) {
+ BIGNUM *updated_s = BN_new();
+ BN_copy(updated_s, current_s);
+ BN_sub(updated_s, order, updated_s);
+ ECDSA_SIG_set0(sig, NULL, updated_s);
}
+
+ BN_free(order);
+ BN_free(halforder);
+
vchSig.clear();
vchSig.resize(65,0);
- int nBitsR = BN_num_bits(sig->r);
- int nBitsS = BN_num_bits(sig->s);
+ int nBitsR = BN_num_bits(ECDSA_SIG_get0_r(sig));
+ int nBitsS = BN_num_bits(ECDSA_SIG_get0_s(sig));
+ bool fCompressedPubKey = IsCompressed();
if (nBitsR <= 256 && nBitsS <= 256)
{
int8_t nRecId = -1;
}
vchSig[0] = nRecId+27+(fCompressedPubKey ? 4 : 0);
- BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]);
- BN_bn2bin(sig->s,&vchSig[65-(nBitsS+7)/8]);
+ BN_bn2bin(ECDSA_SIG_get0_r(sig),&vchSig[33-(nBitsR+7)/8]);
+ BN_bn2bin(ECDSA_SIG_get0_s(sig),&vchSig[65-(nBitsS+7)/8]);
fOk = true;
}
+
ECDSA_SIG_free(sig);
return fOk;
}
if (nV<27 || nV>=35)
return false;
ECDSA_SIG *sig = ECDSA_SIG_new();
- BN_bin2bn(&vchSig[1],32,sig->r);
- BN_bin2bn(&vchSig[33],32,sig->s);
-
+ BIGNUM *sig_r = BN_new(), *sig_s = BN_new();
+ BN_bin2bn(&vchSig[1],32,sig_r);
+ BN_bin2bn(&vchSig[33],32,sig_s);
+ ECDSA_SIG_set0(sig, sig_r, sig_s);
+ bool fSuccessful = false;
EC_KEY* pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
if (nV >= 31)
{
nV -= 4;
EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
}
-
do
{
if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), nV - 27, 0) != 1)
break;
- ECDSA_SIG_free(sig);
-
int nSize = i2o_ECPublicKey(pkey, NULL);
if (!nSize)
break;
if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
break;
Set(vchPubKey.begin(), vchPubKey.end());
- return IsValid();
+ fSuccessful = IsValid();
} while (false);
-
ECDSA_SIG_free(sig);
- Invalidate();
- return false;
+ EC_KEY_free(pkey);
+ if (!fSuccessful)
+ Invalidate();
+ return fSuccessful;
}
bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const
if (vchSig.empty() || !IsValid())
return false;
- const unsigned char* pbegin = &vbytes[0];
EC_KEY *pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
- if (!o2i_ECPublicKey(&pkey, &pbegin, size()))
- return false; // Unable to parse public key
-
- // New versions of OpenSSL will reject non-canonical DER signatures. de/re-serialize first.
- unsigned char *norm_der = NULL;
ECDSA_SIG *norm_sig = ECDSA_SIG_new();
- const unsigned char* sigptr = &vchSig[0];
+
assert(norm_sig);
- if (d2i_ECDSA_SIG(&norm_sig, &sigptr, vchSig.size()) == NULL)
+ assert(pkey);
+
+ bool ret = false;
+ do
{
- /* As of OpenSSL 1.0.0p d2i_ECDSA_SIG frees and nulls the pointer on
- * error. But OpenSSL's own use of this function redundantly frees the
- * result. As ECDSA_SIG_free(NULL) is a no-op, and in the absence of a
- * clear contract for the function behaving the same way is more
- * conservative.
- */
- ECDSA_SIG_free(norm_sig);
- return false;
- }
- int derlen = i2d_ECDSA_SIG(norm_sig, &norm_der);
+ int derlen;
+ uint8_t *norm_der = NULL;
+ const uint8_t* pbegin = &vbytes[0];
+ const uint8_t* sigptr = &vchSig[0];
+
+ // Trying to parse public key
+ if (!o2i_ECPublicKey(&pkey, &pbegin, size()))
+ break;
+ // New versions of OpenSSL are rejecting a non-canonical DER signatures, de/re-serialize first.
+ if (d2i_ECDSA_SIG(&norm_sig, &sigptr, vchSig.size()) == NULL)
+ break;
+ if ((derlen = i2d_ECDSA_SIG(norm_sig, &norm_der)) <= 0)
+ break;
+
+ // -1 = error, 0 = bad sig, 1 = good
+ ret = ECDSA_verify(0, (const unsigned char*)&hash, sizeof(hash), norm_der, derlen, pkey) == 1;
+ OPENSSL_free(norm_der);
+ } while(false);
+
ECDSA_SIG_free(norm_sig);
- if (derlen <= 0)
- return false;
+ EC_KEY_free(pkey);
- // -1 = error, 0 = bad sig, 1 = good
- bool ret = ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), norm_der, derlen, pkey) == 1;
- OPENSSL_free(norm_der);
return ret;
}
// ECC multiplication by specified multiplier
bool CPoint::ECMUL(const CBigNum &bnMultiplier)
{
- if (!EC_POINT_mul(group, point, NULL, point, &bnMultiplier, NULL)) {
- printf("CPoint::ECMUL() : EC_POINT_mul failed");
- return false;
- }
-
- return true;
+ BIGNUM* bnMul = bnMultiplier.get();
+ bool ok = EC_POINT_mul(group, point, NULL, point, bnMul, NULL);
+ if (!ok) printf("CPoint::ECMUL() : EC_POINT_mul failed");
+ BN_free(bnMul);
+ return ok;
}
// Calculate G*m + q
bool CPoint::ECMULGEN(const CBigNum &bnMultiplier, const CPoint &qPoint)
{
- if (!EC_POINT_mul(group, point, &bnMultiplier, qPoint.point, BN_value_one(), NULL)) {
- printf("CPoint::ECMULGEN() : EC_POINT_mul failed.");
- return false;
- }
-
- return true;
+ BIGNUM* bnMul = bnMultiplier.get();
+ bool ok = EC_POINT_mul(group, point, bnMul, qPoint.point, BN_value_one(), NULL);
+ if (!ok) printf("CPoint::ECMULGEN() : EC_POINT_mul failed.");
+ BN_free(bnMul);
+ return ok;
}
// CMalleablePubKey
R = CPubKey(vchPubKey);
// OpenSSL BIGNUM representation of r value
- CBigNum bnr;
- bnr = *(CBigNum*) EC_KEY_get0_private_key(eckey);
+ CBigNum bnr(EC_KEY_get0_private_key(eckey));
EC_KEY_free(eckey);
CPoint point;
{
return vchSecretL.size() == 32 && GetMalleablePubKey().IsValid();
}
-
-//// Asymmetric encryption
-
-void CPubKey::EncryptData(const std::vector<unsigned char>& data, std::vector<unsigned char>& encrypted)
-{
- ies_ctx_t *ctx;
- char error[1024] = "Unknown error";
- cryptogram_t *cryptogram;
-
- const unsigned char* pbegin = &vbytes[0];
- EC_KEY *pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
- if (!o2i_ECPublicKey(&pkey, &pbegin, size()))
- throw key_error("Unable to parse EC key");
-
- ctx = create_context(pkey);
- if (!EC_KEY_get0_public_key(ctx->user_key))
- throw key_error("Given EC key is not public key");
-
- cryptogram = ecies_encrypt(ctx, (unsigned char*)&data[0], data.size(), error);
- if (cryptogram == NULL) {
- delete ctx;
- ctx = NULL;
- throw key_error(std::string("Error in encryption: %s") + error);
- }
-
- encrypted.resize(cryptogram_data_sum_length(cryptogram));
- unsigned char *key_data = cryptogram_key_data(cryptogram);
- memcpy(&encrypted[0], key_data, encrypted.size());
- cryptogram_free(cryptogram);
- delete ctx;
-}
-
-void CKey::DecryptData(const std::vector<unsigned char>& encrypted, std::vector<unsigned char>& data)
-{
- ies_ctx_t *ctx;
- char error[1024] = "Unknown error";
- cryptogram_t *cryptogram;
- size_t length;
- unsigned char *decrypted;
-
- ctx = create_context(pkey);
- if (!EC_KEY_get0_private_key(ctx->user_key))
- throw key_error("Given EC key is not private key");
-
- size_t key_length = ctx->stored_key_length;
- size_t mac_length = EVP_MD_size(ctx->md);
- cryptogram = cryptogram_alloc(key_length, mac_length, encrypted.size() - key_length - mac_length);
-
- memcpy(cryptogram_key_data(cryptogram), &encrypted[0], encrypted.size());
-
- decrypted = ecies_decrypt(ctx, cryptogram, &length, error);
- cryptogram_free(cryptogram);
- delete ctx;
-
- if (decrypted == NULL) {
- throw key_error(std::string("Error in decryption: %s") + error);
- }
-
- data.resize(length);
- memcpy(&data[0], decrypted, length);
- free(decrypted);
-}
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