#include <stdint.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <tcl.h>
#include "randombytes.h"
#include "tweetnacl.h"
#include "blake2.h"
#define NANO_SECRET_KEY_LENGTH (crypto_sign_SECRETKEYBYTES - crypto_sign_PUBLICKEYBYTES)
#define NANO_PUBLIC_KEY_LENGTH (crypto_sign_PUBLICKEYBYTES)
#define NANO_BLOCK_HASH_LENGTH 32
#define NANO_BLOCK_SIGNATURE_LENGTH crypto_sign_BYTES
#define NANO_WORK_VALUE_LENGTH 8
#define NANO_WORK_HASH_LENGTH 8
#define NANO_WORK_DEFAULT_MIN 0xffffffc000000000LLU
#define TclNano_AttemptAlloc(x) ((void *) Tcl_AttemptAlloc(x))
#define TclNano_Free(x) Tcl_Free((char *) x)
#define TclNano_SetIntVar(interp, name, intValue) \
tclobj_ret = Tcl_SetVar2Ex(interp, name, NULL, Tcl_NewIntObj(intValue), TCL_GLOBAL_ONLY | TCL_LEAVE_ERR_MSG); \
if (!tclobj_ret) { \
return(TCL_ERROR); \
}
#define TclNano_CreateNamespace(interp, name) \
tclobj_ret = Tcl_CreateNamespace(interp, name, NULL, NULL); \
if (!tclobj_ret) { \
return(TCL_ERROR); \
}
#define TclNano_CreateObjCommand(interp, name, functionName) \
tclobj_ret = Tcl_CreateObjCommand(interp, name, functionName, NULL, NULL); \
if (!tclobj_ret) { \
return(TCL_ERROR); \
}
#define TclNano_Eval(interp, script) \
tclcmd_ret = Tcl_Eval(interp, script); \
if (tclcmd_ret != TCL_OK) { \
return(tclcmd_ret); \
}
#define TclNano_PkgProvide(interp, name, version) \
tclcmd_ret = Tcl_PkgProvide(interp, name, version); \
if (tclcmd_ret != TCL_OK) { \
return(tclcmd_ret); \
}
static unsigned char *nano_parse_secret_key(Tcl_Obj *secret_key_only_obj, int *out_key_length) {
unsigned char *secret_key, *public_key, *secret_key_only;
int secret_key_length, secret_key_only_length;
secret_key_only = Tcl_GetByteArrayFromObj(secret_key_only_obj, &secret_key_only_length);
if (secret_key_only_length != NANO_SECRET_KEY_LENGTH) {
return(NULL);
}
if ((NANO_SECRET_KEY_LENGTH + NANO_PUBLIC_KEY_LENGTH) != crypto_sign_SECRETKEYBYTES) {
return(NULL);
}
secret_key_length = crypto_sign_SECRETKEYBYTES;
secret_key = TclNano_AttemptAlloc(secret_key_length);
if (!secret_key) {
return(NULL);
}
memcpy(secret_key, secret_key_only, secret_key_only_length);
public_key = secret_key + secret_key_only_length;
crypto_sign_keypair(public_key, secret_key, 0);
*out_key_length = secret_key_length;
return(secret_key);
}
static int nano_tcl_generate_keypair(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
unsigned char secret_key[crypto_sign_SECRETKEYBYTES], public_key[crypto_sign_PUBLICKEYBYTES];
unsigned char *seed, *buffer, buffer_s[NANO_SECRET_KEY_LENGTH + 4];
long seed_index;
int seed_length, buffer_length;
int csk_ret, tglfo_ret;
if (objc != 1 && objc != 3) {
Tcl_WrongNumArgs(interp, 1, objv, "?seed index?");
return(TCL_ERROR);
}
if (objc == 1) {
csk_ret = crypto_sign_keypair(public_key, secret_key, 1);
if (csk_ret != 0) {
Tcl_SetResult(interp, "Internal error", NULL);
return(TCL_ERROR);
}
} else {
seed = Tcl_GetByteArrayFromObj(objv[1], &seed_length);
if (seed_length != NANO_SECRET_KEY_LENGTH) {
Tcl_SetResult(interp, "Seed is not the right size", NULL);
return(TCL_ERROR);
}
tglfo_ret = Tcl_GetLongFromObj(interp, objv[2], &seed_index);
if (tglfo_ret != TCL_OK) {
return(tglfo_ret);
}
if (seed_index > 0xffffffffL) {
Tcl_SetResult(interp, "Seed exceed maximum value", NULL);
return(TCL_ERROR);
}
buffer_length = sizeof(buffer_s);
buffer = buffer_s;
memcpy(buffer, seed, seed_length);
buffer += seed_length;
buffer[0] = (seed_index >> 24) & 0xff;
buffer[1] = (seed_index >> 16) & 0xff;
buffer[2] = (seed_index >> 8) & 0xff;
buffer[3] = seed_index & 0xff;
buffer -= seed_length;
blake2b(secret_key, NANO_SECRET_KEY_LENGTH, buffer, buffer_length, NULL, 0);
}
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(secret_key, NANO_SECRET_KEY_LENGTH));
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
static int nano_tcl_generate_seed(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
unsigned char seed[NANO_SECRET_KEY_LENGTH];
int seed_length;
if (objc != 1) {
Tcl_WrongNumArgs(interp, 1, objv, "");
return(TCL_ERROR);
}
seed_length = sizeof(seed);
randombytes(seed, seed_length);
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(seed, seed_length));
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
static int nano_tcl_secret_key_to_public_key(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
unsigned char *secret_key, *public_key;
int secret_key_length, public_key_length;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "secretKey");
return(TCL_ERROR);
}
secret_key = Tcl_GetByteArrayFromObj(objv[1], &secret_key_length);
if (secret_key_length != NANO_SECRET_KEY_LENGTH) {
Tcl_SetResult(interp, "Secret key is not the right size", NULL);
return(TCL_ERROR);
}
public_key_length = NANO_PUBLIC_KEY_LENGTH;
public_key = TclNano_AttemptAlloc(public_key_length);
if (!public_key) {
Tcl_SetResult(interp, "Internal error", NULL);
return(TCL_ERROR);
}
crypto_sign_keypair(public_key, secret_key, 0);
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(public_key, public_key_length));
TclNano_Free(public_key);
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
static int nano_tcl_sign_detached(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
int cs_ret;
unsigned char *signature, *data, *secret_key;
unsigned long long signature_length;
int data_length, secret_key_length;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 1, objv, "data secretKey");
return(TCL_ERROR);
}
data = Tcl_GetByteArrayFromObj(objv[1], &data_length);
signature_length = data_length + NANO_BLOCK_SIGNATURE_LENGTH;
if (signature_length >= UINT_MAX) {
Tcl_SetResult(interp, "Input message too long", NULL);
return(TCL_ERROR);
}
secret_key = nano_parse_secret_key(objv[2], &secret_key_length);
if (!secret_key) {
Tcl_SetResult(interp, "Secret key is not the right size", NULL);
return(TCL_ERROR);
}
signature = TclNano_AttemptAlloc(signature_length);
if (!signature) {
TclNano_Free(secret_key);
Tcl_SetResult(interp, "Unable to allocate memory", NULL);
return(TCL_ERROR);
}
cs_ret = crypto_sign(signature, &signature_length, data, data_length, secret_key);
if (cs_ret != 0) {
TclNano_Free(secret_key);
TclNano_Free(signature);
Tcl_SetResult(interp, "crypto_sign failed", NULL);
return(TCL_ERROR);
}
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(signature, NANO_BLOCK_SIGNATURE_LENGTH));
TclNano_Free(signature);
TclNano_Free(secret_key);
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
static int nano_tcl_verify_detached(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
int cso_ret;
unsigned char *signature, *data, *signed_data, *verify_data, *public_key;
int signature_length, data_length, signed_data_length, verify_data_length, public_key_length;
unsigned long long verify_data_length_nacl;
int result;
if (objc != 4) {
Tcl_WrongNumArgs(interp, 1, objv, "data signature publicKey");
return(TCL_ERROR);
}
data = Tcl_GetByteArrayFromObj(objv[1], &data_length);
signature = Tcl_GetByteArrayFromObj(objv[2], &signature_length);
if (signature_length != NANO_BLOCK_SIGNATURE_LENGTH) {
Tcl_SetResult(interp, "Signature is not the right size", NULL);
return(TCL_ERROR);
}
public_key = Tcl_GetByteArrayFromObj(objv[3], &public_key_length);
if (public_key_length != NANO_PUBLIC_KEY_LENGTH) {
Tcl_SetResult(interp, "Public key is not the right size", NULL);
return(TCL_ERROR);
}
signed_data_length = data_length + signature_length;
signed_data = TclNano_AttemptAlloc(signed_data_length);
if (!signed_data) {
Tcl_SetResult(interp, "Internal error", NULL);
return(TCL_ERROR);
}
memcpy(signed_data, signature, signature_length);
memcpy(signed_data + signature_length, data, data_length);
verify_data_length = signed_data_length;
verify_data = TclNano_AttemptAlloc(verify_data_length);
if (!verify_data) {
TclNano_Free(verify_data);
Tcl_SetResult(interp, "Internal error", NULL);
return(TCL_ERROR);
}
verify_data_length_nacl = verify_data_length;
cso_ret = crypto_sign_open(verify_data, &verify_data_length_nacl, signed_data, signed_data_length, public_key);
result = 0;
if (cso_ret == 0) {
result = 1;
}
TclNano_Free(signed_data);
TclNano_Free(verify_data);
Tcl_SetObjResult(interp, Tcl_NewBooleanObj(result));
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
static int nano_tcl_hash_data(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
unsigned char *data, result[NANO_BLOCK_SIGNATURE_LENGTH];
int tgifo_ret;
int data_length, result_length;
if (objc < 2 || objc > 3) {
Tcl_WrongNumArgs(interp, 1, objv, "data ?hashLength?");
return(TCL_ERROR);
}
data = Tcl_GetByteArrayFromObj(objv[1], &data_length);
if (objc == 3) {
tgifo_ret = Tcl_GetIntFromObj(interp, objv[2], &result_length);
if (tgifo_ret != TCL_OK) {
return(tgifo_ret);
}
if (result_length > sizeof(result)) {
Tcl_SetResult(interp, "Hash length too large", NULL);
return(TCL_ERROR);
}
blake2b(result, result_length, data, data_length, NULL, 0);
} else {
/*
* Default to the same as the cryptographic primitive
*/
crypto_hash(result, data, data_length);
result_length = NANO_BLOCK_SIGNATURE_LENGTH;
}
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(result, result_length));
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
static int nano_validate_work(const unsigned char *blockhash, const unsigned char *work, uint64_t workMin) {
unsigned char workReversed[NANO_WORK_VALUE_LENGTH], workCheck[NANO_WORK_HASH_LENGTH];
unsigned int idxIn, idxOut;
blake2b_state workhash_state;
uint64_t workValue;
int blake2_ret;
idxIn = sizeof(workReversed) - 1;
idxOut = 0;
while (idxOut < sizeof(workReversed)) {
workReversed[idxOut] = work[idxIn];
idxOut++;
idxIn--;
}
blake2_ret = blake2b_init(&workhash_state, sizeof(workCheck));
if (blake2_ret != 0) {
return(0);
}
blake2_ret = blake2b_update(&workhash_state, workReversed, sizeof(workReversed));
if (blake2_ret != 0) {
return(0);
}
blake2_ret = blake2b_update(&workhash_state, blockhash, NANO_BLOCK_HASH_LENGTH);
if (blake2_ret != 0) {
return(0);
}
blake2_ret = blake2b_final(&workhash_state, workCheck, sizeof(workCheck));
if (blake2_ret != 0) {
return(0);
}
workValue = 0;
for (idxIn = sizeof(workCheck); idxIn > 0; idxIn--) {
workValue <<= 8;
workValue |= workCheck[idxIn - 1];
}
if (workValue < workMin) {
/* Fails to meet the requirements */
return(0);
}
return(1);
}
static void nano_generate_work(const unsigned char *blockhash, unsigned char *workOut, uint64_t workMin) {
unsigned char work[NANO_WORK_VALUE_LENGTH];
unsigned int offset;
int work_valid;
memcpy(work, blockhash, sizeof(work));
while (1) {
work_valid = nano_validate_work(blockhash, work, workMin);
if (work_valid) {
break;
}
offset = 0;
while (work[offset] == 0xff) {
work[offset] = 0;
offset++;
offset %= sizeof(work);
}
work[offset] = (((int) work[offset]) + 1) & 0xff;
}
memcpy(workOut, work, sizeof(work));
return;
}
static int nano_tcl_validate_work(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
unsigned char *blockhash, *work;
Tcl_WideUInt tclWorkMin;
uint64_t workMin = NANO_WORK_DEFAULT_MIN;
int blockhash_length, work_length;
int valid, result;
int tgwifo_ret;
if (objc < 3 || objc > 4) {
Tcl_WrongNumArgs(interp, 1, objv, "workBlockhash work ?workMin?");
return(TCL_ERROR);
}
blockhash = Tcl_GetByteArrayFromObj(objv[1], &blockhash_length);
if (blockhash_length != NANO_BLOCK_HASH_LENGTH) {
Tcl_SetResult(interp, "Block hash size is wrong", NULL);
return(TCL_ERROR);
}
work = Tcl_GetByteArrayFromObj(objv[2], &work_length);
if (work_length != NANO_WORK_VALUE_LENGTH) {
Tcl_SetResult(interp, "Work size is wrong", NULL);
return(TCL_ERROR);
}
if (objc == 4) {
tgwifo_ret = Tcl_GetWideIntFromObj(interp, objv[3], (Tcl_WideInt *) &tclWorkMin);
if (tgwifo_ret != TCL_OK) {
return(tgwifo_ret);
}
workMin = tclWorkMin;
}
valid = nano_validate_work(blockhash, work, workMin);
if (valid) {
result = 1;
} else {
result = 0;
}
Tcl_SetObjResult(interp, Tcl_NewBooleanObj(result));
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
static int nano_tcl_generate_work(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
Tcl_WideUInt tclWorkMin;
unsigned char *blockhash;
unsigned char work[NANO_WORK_VALUE_LENGTH];
uint64_t workMin = NANO_WORK_DEFAULT_MIN;
int blockhash_length;
int tgwifo_ret;
if (objc < 2 || objc > 3) {
Tcl_WrongNumArgs(interp, 1, objv, "workBlockhash ?workMin?");
return(TCL_ERROR);
}
blockhash = Tcl_GetByteArrayFromObj(objv[1], &blockhash_length);
if (blockhash_length != NANO_BLOCK_HASH_LENGTH) {
Tcl_SetResult(interp, "Block hash size is wrong", NULL);
return(TCL_ERROR);
}
if (objc == 3) {
tgwifo_ret = Tcl_GetWideIntFromObj(interp, objv[2], (Tcl_WideInt *) &tclWorkMin);
if (tgwifo_ret != TCL_OK) {
return(tgwifo_ret);
}
workMin = tclWorkMin;
}
nano_generate_work(blockhash, work, workMin);
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(work, sizeof(work)));
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
static int nano_tcl_random_bytes(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
unsigned char *buffer;
int number_of_bytes;
int tgifo_ret;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "numberOfBytes");
return(TCL_ERROR);
}
tgifo_ret = Tcl_GetIntFromObj(interp, objv[1], &number_of_bytes);
if (tgifo_ret != TCL_OK) {
return(tgifo_ret);
}
if (number_of_bytes > 128) {
Tcl_SetResult(interp, "May only request 128 bytes of random data at once", NULL);
return(TCL_ERROR);
}
buffer = TclNano_AttemptAlloc(number_of_bytes);
if (!buffer) {
Tcl_SetResult(interp, "memory allocation failure", NULL);
return(TCL_ERROR);
}
randombytes(buffer, number_of_bytes);
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(buffer, number_of_bytes));
TclNano_Free(buffer);
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
static int nano_tcl_self_test(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
if (objc != 1) {
Tcl_WrongNumArgs(interp, 1, objv, "");
return(TCL_ERROR);
}
return(TCL_OK);
/* NOTREACH */
clientData = clientData;
}
int Nano_Init(Tcl_Interp *interp) {
void *tclobj_ret;
int tclcmd_ret;
const char nanoInitScript[] = {
#include "nano.tcl.h"
0x00
};
#ifdef USE_TCL_STUBS
const char *tclInitStubs_ret;
/* Initialize Stubs */
tclInitStubs_ret = Tcl_InitStubs(interp, TCL_PATCH_LEVEL, 0);
if (!tclInitStubs_ret) {
return(TCL_ERROR);
}
#endif
if (!interp) {
return(TCL_OK);
}
TclNano_CreateNamespace(interp, "::nano");
TclNano_CreateNamespace(interp, "::nano::block");
TclNano_CreateNamespace(interp, "::nano::key");
TclNano_CreateNamespace(interp, "::nano::work");
TclNano_SetIntVar(interp, "::nano::block::hashLength", NANO_BLOCK_HASH_LENGTH);
TclNano_SetIntVar(interp, "::nano::block::signatureLength", NANO_BLOCK_SIGNATURE_LENGTH);
TclNano_SetIntVar(interp, "::nano::key::publicKeyLength", NANO_PUBLIC_KEY_LENGTH);
TclNano_SetIntVar(interp, "::nano::key::privateKeyLength", NANO_SECRET_KEY_LENGTH);
TclNano_SetIntVar(interp, "::nano::key::seedLength", NANO_SECRET_KEY_LENGTH);
TclNano_SetIntVar(interp, "::nano::work::workValueLength", NANO_WORK_VALUE_LENGTH);
TclNano_SetIntVar(interp, "::nano::work::workHashLength", NANO_WORK_HASH_LENGTH);
TclNano_CreateObjCommand(interp, "::nano::internal::selfTest", nano_tcl_self_test);
TclNano_CreateObjCommand(interp, "::nano::internal::generateKey", nano_tcl_generate_keypair);
TclNano_CreateObjCommand(interp, "::nano::internal::generateSeed", nano_tcl_generate_seed);
TclNano_CreateObjCommand(interp, "::nano::internal::publicKey", nano_tcl_secret_key_to_public_key);
TclNano_CreateObjCommand(interp, "::nano::internal::signDetached", nano_tcl_sign_detached);
TclNano_CreateObjCommand(interp, "::nano::internal::verifyDetached", nano_tcl_verify_detached);
TclNano_CreateObjCommand(interp, "::nano::internal::hashData", nano_tcl_hash_data);
TclNano_CreateObjCommand(interp, "::nano::internal::validateWork", nano_tcl_validate_work);
TclNano_CreateObjCommand(interp, "::nano::internal::generateWork", nano_tcl_generate_work);
TclNano_CreateObjCommand(interp, "::nano::internal::randomBytes", nano_tcl_random_bytes);
TclNano_Eval(interp, nanoInitScript);
TclNano_PkgProvide(interp, "nano", PACKAGE_VERSION);
return(TCL_OK);
}