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Adding src/libsecp256k1/ec.cpp

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This commit is contained in:
Henrik Hautakoski 2023-03-14 20:57:59 +01:00
parent 2ab5e7b444
commit 54fc8614ef
1 changed files with 52 additions and 41 deletions
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93
include/libeosio/types.hpp → src/libsecp256k1/ec.cpp
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@ -21,53 +21,64 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef LIBEOSIO_TYPES_H
#define LIBEOSIO_TYPES_H
#include <iostream>
#include <array>
#include <secp256k1.h>
#include <secp256k1_ecdh.h>
#include <libeosio/ec.hpp>
#include "rng.h"
namespace libeosio {
/**
* Elliptic curve private key size (in bytes)
*/
#define EC_PRIVKEY_SIZE 32
secp256k1_context* ctx;
/**
* Elliptic curve public key size (in bytes)
*
* Compressed format: z||x, where byte z specifies which (of the 2) solutions
* of the quadratic equation y is. Each cordinate is 32 bytes.
*/
#define EC_PUBKEY_SIZE (32 + 1)
int ec_init() {
ctx = secp256k1_context_create(SECP256K1_CONTEXT_NONE);
return ctx == NULL ? -1 : 0;
}
/**
* Elliptic curve priv/pub key datastructures.
*/
typedef std::array<unsigned char, EC_PRIVKEY_SIZE> ec_privkey_t;
typedef std::array<unsigned char, EC_PUBKEY_SIZE> ec_pubkey_t;
void ec_shutdown() {
if (ctx) {
secp256k1_context_destroy(ctx);
ctx = NULL;
}
}
/**
* Elliptic curve keypair (public + private)
*/
struct ec_keypair {
ec_privkey_t secret;
ec_pubkey_t pub;
};
int ec_generate_key(struct ec_keypair *pair) {
/**
* Hashes
*/
typedef struct { unsigned char data[20]; } ripemd160_t;
typedef struct { unsigned char data[32]; } sha256_t;
int ret = -1;
size_t len;
secp256k1_pubkey pub;
unsigned char seckey[32];
unsigned char randomize[32];
if (!fill_random(randomize, sizeof(randomize))) {
return -1;
}
if (secp256k1_context_randomize(ctx, randomize) < 0) {
return -1;
}
while (1) {
if (!fill_random(pair->secret.data(), pair->secret.size())) {
return -1;
}
if (secp256k1_ec_seckey_verify(ctx, pair->secret.data())) {
break;
}
}
if (secp256k1_ec_pubkey_create(ctx, &pub, pair->secret.data()) < 0) {
return -1;
}
len = EC_PUBKEY_SIZE;
secp256k1_ec_pubkey_serialize(ctx, pair->pub.data(), &len, &pub, SECP256K1_EC_COMPRESSED);
if (len != EC_PUBKEY_SIZE) {
return -1;
}
return ret;
}
} // namespace libeosio
// Stream operators
std::ostream& operator<<(std::ostream& os, const libeosio::ec_privkey_t& pk);
std::ostream& operator<<(std::ostream& os, const libeosio::ec_pubkey_t& pk);
#endif /* LIBEOSIO_TYPES_H */