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sodium.cc
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/**
* Node Native Module for Lib Sodium
*
* @Author Pedro Paixao
* @email paixaop at gmail dot com
* @License MIT
*/
#include <node.h>
#include <node_buffer.h>
#include <cstdlib>
#include <ctime>
#include <cstring>
#include <string>
#include <sstream>
#include <nan.h>
#include "sodium.h"
using namespace node;
using namespace v8;
// get handle to the global object
Local<Object> globalObj = NanGetCurrentContext()->Global();
// Retrieve the buffer constructor function
Local<Function> bufferConstructor =
Local<Function>::Cast(globalObj->Get(NanNew<String>("Buffer")));
// Check if a function argument is a node Buffer. If not throw V8 exception
#define ARG_IS_BUFFER(i,msg) \
if (!Buffer::HasInstance(args[i])) { \
std::ostringstream oss; \
oss << "argument " << msg << " must be a buffer"; \
return NanThrowError(oss.str().c_str()); \
}
// Create a new buffer, and get a pointer to it
#define NEW_BUFFER_AND_PTR(name, size) \
Local<Object> name = NanNewBufferHandle(size); \
unsigned char* name ## _ptr = (unsigned char*)Buffer::Data(name)
#define GET_ARG_AS(i, NAME, TYPE) \
ARG_IS_BUFFER(i,#NAME); \
TYPE NAME = (TYPE) Buffer::Data(args[i]->ToObject()); \
unsigned long long NAME ## _size = Buffer::Length(args[i]->ToObject()); \
if( NAME ## _size == 0 ) { \
std::ostringstream oss; \
oss << "argument " << #NAME << " length cannot be zero" ; \
return NanThrowError(oss.str().c_str()); \
}
#define GET_ARG_AS_LEN(i, NAME, MAXLEN, TYPE) \
GET_ARG_AS(i, NAME, TYPE); \
if( NAME ## _size != MAXLEN ) { \
std::ostringstream oss; \
oss << "argument " << #NAME << " must be " << MAXLEN << " bytes long" ; \
return NanThrowError(oss.str().c_str()); \
}
#define GET_ARG_AS_UCHAR(i, NAME) \
GET_ARG_AS(i, NAME, unsigned char*)
#define GET_ARG_AS_UCHAR_LEN(i, NAME, MAXLEN) \
GET_ARG_AS_LEN(i, NAME, MAXLEN, unsigned char*)
#define GET_ARG_AS_VOID(i, NAME) \
GET_ARG_AS(i, NAME, void*)
#define GET_ARG_AS_VOID_LEN(i, NAME, MAXLEN) \
GET_ARG_AS_LEN(i, NAME, MAXLEN, void*)
#define NUMBER_OF_MANDATORY_ARGS(n, message) \
if (args.Length() < (n)) { \
return NanThrowError(message); \
}
#define TO_REAL_BUFFER(slowBuffer, actualBuffer) \
Handle<Value> constructorArgs ## slowBuffer[3] = \
{ slowBuffer->handle_, \
NanNew<Integer>(Buffer::Length(slowBuffer)), \
NanNew<Integer>(0) }; \
Local<Object> actualBuffer = bufferConstructor->NewInstance(3, constructorArgs ## slowBuffer);
// Lib Sodium Version Functions
NAN_METHOD(bind_sodium_version_string) {
NanEscapableScope();
NanReturnValue(NanNew<String>(sodium_version_string()));
}
NAN_METHOD(bind_sodium_library_version_minor) {
NanEscapableScope();
NanReturnValue(
NanNew(sodium_library_version_minor())
);
}
NAN_METHOD(bind_sodium_library_version_major) {
NanEscapableScope();
NanReturnValue(
NanNew(sodium_library_version_major())
);
}
// Lib Sodium Utils
NAN_METHOD(bind_memzero) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(1,"argument must be a buffer");
GET_ARG_AS_VOID(0, buffer);
sodium_memzero(buffer, buffer_size);
NanReturnValue(NanNull());
}
/**
* int sodium_memcmp(const void * const b1_, const void * const b2_, size_t size);
*/
NAN_METHOD(bind_memcmp) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(2,"argument must be a buffer");
GET_ARG_AS_VOID(0, buffer_1);
GET_ARG_AS_VOID(1, buffer_2);
size_t size;
if (args[2]->IsUint32()) {
size = args[2]->Int32Value();
} else {
return NanThrowError("argument size must be a positive number");
}
size_t s = (buffer_1_size < buffer_2_size)? buffer_1_size : buffer_2_size;
if( s < size ) {
size = s;
}
NanReturnValue(NanNew<Integer>(sodium_memcmp(buffer_1, buffer_2, size)));
}
/**
* char *sodium_bin2hex(char * const hex, const size_t hexlen,
* const unsigned char *bin, const size_t binlen);
*/
NAN_METHOD(bind_sodium_bin2hex) {
NanScope();
return NanThrowError("use node's native Buffer.toString()");
}
// Lib Sodium Random
// void randombytes_buf(void *const buf, const size_t size)
NAN_METHOD(bind_randombytes_buf) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(1,"argument must be a buffer");
GET_ARG_AS_VOID(0, buffer);
randombytes_buf(buffer, buffer_size);
NanReturnValue(NanNull());
}
// void randombytes_stir()
NAN_METHOD(bind_randombytes_stir) {
NanEscapableScope();
randombytes_stir();
NanReturnValue(NanNull());
}
NAN_METHOD(bind_randombytes_close) {
NanEscapableScope();
// int randombytes_close()
NanReturnValue(NanNew<Integer>(randombytes_close()));
}
NAN_METHOD(bind_randombytes_random) {
NanEscapableScope();
// uint_32 randombytes_random()
NanReturnValue(NanNew<Int32>(randombytes_random()));
}
NAN_METHOD(bind_randombytes_uniform) {
NanEscapableScope();
uint32_t upper_bound;
NUMBER_OF_MANDATORY_ARGS(1,"argument size must be a positive number");
if (args[0]->IsUint32()) {
upper_bound = args[0]->Int32Value();
} else {
return NanThrowError("argument size must be a positive number");
}
// uint32_t randombytes_uniform(const uint32_t upper_bound)
NanReturnValue(NanNew<Int32>(randombytes_uniform(upper_bound)));
}
NAN_METHOD(bind_crypto_verify_16) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(2,"arguments must be two buffers");
GET_ARG_AS_UCHAR_LEN(0,string1, crypto_verify_16_BYTES);
GET_ARG_AS_UCHAR_LEN(1,string2, crypto_verify_16_BYTES);
NanReturnValue(NanNew<Integer>(crypto_verify_16(string1, string2)));
}
// int crypto_verify_16(const unsigned char * string1, const unsigned char * string2)
NAN_METHOD(bind_crypto_verify_32) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(2,"arguments must be two buffers");
GET_ARG_AS_UCHAR_LEN(0,string1, crypto_verify_32_BYTES);
GET_ARG_AS_UCHAR_LEN(1,string2, crypto_verify_32_BYTES);
NanReturnValue(NanNew<Integer>(crypto_verify_32(string1, string2)));
}
/**
* int crypto_shorthash(
* unsigned char *out,
* const unsigned char *in,
* unsigned long long inlen,
* const unsigned char *key)
*
* Parameters:
* [out] out result of hash
* [in] in input buffer
* [in] inlen size of input buffer
* [in] key key buffer
*
* A lot of applications and programming language implementations have been
* recently found to be vulnerable to denial-of-service attacks when a hash
* function with weak security guarantees, like Murmurhash 3, was used to
* construct a hash table.
* In order to address this, Sodium provides the �shorthash� function,
* currently implemented using SipHash-2-4. This very fast hash function
* outputs short, but unpredictable (without knowing the secret key) values
* suitable for picking a list in a hash table for a given key.
*/
NAN_METHOD(bind_crypto_shorthash) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(1,"argument message must be a buffer");
GET_ARG_AS_UCHAR(0,message);
GET_ARG_AS_UCHAR_LEN(1, key, crypto_shorthash_KEYBYTES);
NEW_BUFFER_AND_PTR(hash, crypto_shorthash_BYTES);
if( crypto_shorthash(hash_ptr, message, message_size, key) == 0 ) {
NanReturnValue(hash);
}
NanReturnValue(NanNull());
}
/**
* int crypto_hash(
* unsigned char * hbuf,
* const unsigned char * msg,
* unsigned long long mlen)
*/
NAN_METHOD(bind_crypto_hash) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(1,"argument message must be a buffer");
GET_ARG_AS_UCHAR(0,msg);
NEW_BUFFER_AND_PTR(hash, crypto_hash_BYTES);
if( crypto_hash(hash_ptr, msg, msg_size) == 0 ) {
NanReturnValue(hash);
}
NanReturnValue(NanNull());
}
/**
* int crypto_hash_sha256(
* unsigned char * hbuf,
* const unsigned char * msg,
* unsigned long long mlen)
*/
NAN_METHOD(bind_crypto_hash_sha256) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(1,"argument message must be a buffer");
GET_ARG_AS_UCHAR(0, msg);
NEW_BUFFER_AND_PTR(hash, 32);
if( crypto_hash_sha256(hash_ptr, msg, msg_size) == 0 ) {
NanReturnValue(hash);
}
NanReturnValue(NanNull());
}
/**
* int crypto_hash_sha512(
* unsigned char * hbuf,
* const unsigned char * msg,
* unsigned long long mlen)
*/
NAN_METHOD(bind_crypto_hash_sha512) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(1,"argument message must be a buffer");
GET_ARG_AS_UCHAR(0, msg);
NEW_BUFFER_AND_PTR(hash, 64);
if( crypto_hash_sha512(hash_ptr, msg, msg_size) == 0 ) {
NanReturnValue(hash);
}
NanReturnValue(NanNull());
}
/**
* int crypto_auth(
* unsigned char* tok,
* const unsigned char * msg,
* unsigned long long mlen,
* const unsigned char * key)
*
* Parameters:
* [out] tok the generated authentication token.
* [in] msg the message to be authenticated.
* [in] mlen the length of msg.
* [in] key the key used to compute the token.
*/
NAN_METHOD(bind_crypto_auth) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(2,"arguments message, and key must be buffers");
GET_ARG_AS_UCHAR(0, msg);
GET_ARG_AS_UCHAR_LEN(1, key, crypto_auth_KEYBYTES);
NEW_BUFFER_AND_PTR(token, crypto_auth_BYTES);
if( crypto_auth(token_ptr, msg, msg_size, key) == 0 ) {
NanReturnValue(token);
}
NanReturnValue(NanNull());
}
/**
* int crypto_auth_verify(
* unsigned char* tok,
* const unsigned char * msg,
* unsigned long long mlen,
* const unsigned char * key)
*
* Parameters:
* [out] tok the generated authentication token.
* [in] msg the message to be authenticated.
* [in] mlen the length of msg.
* [in] key the key used to compute the token.
*/
NAN_METHOD(bind_crypto_auth_verify) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(3,"arguments token, message, and key must be buffers");
GET_ARG_AS_UCHAR_LEN(0, token, crypto_auth_BYTES);
GET_ARG_AS_UCHAR(1, message);
GET_ARG_AS_UCHAR_LEN(2, key, crypto_auth_KEYBYTES);
NanReturnValue(NanNew<Integer>(crypto_auth_verify(token, message, message_size, key)));
}
/**
* int crypto_onetimeauth(
* unsigned char* tok,
* const unsigned char * msg,
* unsigned long long mlen,
* const unsigned char * key)
*
* Parameters:
* [out] tok the generated authentication token.
* [in] msg the message to be authenticated.
* [in] mlen the length of msg.
* [in] key the key used to compute the token.
*/
NAN_METHOD(bind_crypto_onetimeauth) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(2,"arguments message, and key must be buffers");
GET_ARG_AS_UCHAR(0, message);
GET_ARG_AS_UCHAR_LEN(1, key, crypto_onetimeauth_KEYBYTES);
NEW_BUFFER_AND_PTR(token, crypto_onetimeauth_BYTES);
if( crypto_onetimeauth(token_ptr, message, message_size, key) == 0 ) {
NanReturnValue(token);
}
NanReturnValue(NanNull());
}
/**
* int crypto_onetimeauth_verify(
* unsigned char* tok,
* const unsigned char * msg,
* unsigned long long mlen,
* const unsigned char * key)
*
* Parameters:
* [out] tok the generated authentication token.
* [in] msg the message to be authenticated.
* [in] mlen the length of msg.
* [in] key the key used to compute the token.
*/
NAN_METHOD(bind_crypto_onetimeauth_verify) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(3,"arguments token, message, and key must be buffers");
GET_ARG_AS_UCHAR_LEN(0, token, crypto_onetimeauth_BYTES);
GET_ARG_AS_UCHAR(1, message);
GET_ARG_AS_UCHAR_LEN(2, key, crypto_onetimeauth_KEYBYTES);
NanReturnValue(NanNew<Integer>(crypto_onetimeauth_verify(token, message, message_size, key)));
}
/**
* int crypto_stream(
* unsigned char * stream,
* unsigned long long slen,
* const unsigned char * nonce,
* const unsigned char * key)
*
* Generates a stream using the given secret key and nonce.
*
* Parameters:
* [out] stream the generated stream.
* [out] slen the length of the generated stream.
* [in] nonce the nonce used to generate the stream.
* [in] key the key used to generate the stream.
*
* Returns:
* 0 if operation successful
*/
NAN_METHOD(bind_crypto_stream) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(3,"argument length must be a positive number, arguments nonce, and key must be buffers");
if (!args[0]->IsUint32())
return NanThrowError("argument length must be positive number");
unsigned long long slen = args[0]->ToUint32()->Value();
GET_ARG_AS_UCHAR_LEN(1, nonce, crypto_stream_NONCEBYTES);
GET_ARG_AS_UCHAR_LEN(2, key, crypto_stream_KEYBYTES);
NEW_BUFFER_AND_PTR(stream, slen);
if( crypto_stream(stream_ptr, slen, nonce, key) == 0) {
NanReturnValue(stream);
}
NanReturnValue(NanUndefined());
}
/**
* int crypto_stream_xor(
* unsigned char *c,
* const unsigned char *m,
* unsigned long long mlen,
* const unsigned char *n,
* const unsigned char *k)
*
* Parameters:
* [out] ctxt buffer for the resulting ciphertext.
* [in] msg the message to be encrypted.
* [in] mlen the length of the message.
* [in] nonce the nonce used during encryption.
* [in] key secret key used during encryption.
*
* Returns:
* 0 if operation successful.
*
* Precondition:
* ctxt must have length minimum mlen.
* nonce must have length minimum crypto_stream_NONCEBYTES.
* key must have length minimum crpyto_stream_KEYBYTES
*/
NAN_METHOD(bind_crypto_stream_xor) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(3,"arguments message, nonce, and key must be buffers");
GET_ARG_AS_UCHAR(0, message);
GET_ARG_AS_UCHAR_LEN(1, nonce, crypto_stream_NONCEBYTES);
GET_ARG_AS_UCHAR_LEN(2, key, crypto_stream_KEYBYTES);
NEW_BUFFER_AND_PTR(ctxt, message_size);
if( crypto_stream_xor(ctxt_ptr, message, message_size, nonce, key) == 0) {
NanReturnValue(ctxt);
}
NanReturnValue(NanUndefined());
}
/**
* Encrypts and authenticates a message using the given secret key, and nonce.
*
* int crypto_secretbox(
* unsigned char *ctxt,
* const unsigned char *msg,
* unsigned long long mlen,
* const unsigned char *nonce,
* const unsigned char *key)
*
* Parameters:
* [out] ctxt the buffer for the cipher-text.
* [in] msg the message to be encrypted.
* [in] mlen the length of msg.
* [in] nonce a nonce with length crypto_box_NONCEBYTES.
* [in] key the shared secret key.
*
* Returns:
* 0 if operation is successful.
*
* Precondition:
* first crypto_secretbox_ZEROBYTES of msg be all 0..
*
* Postcondition:
* first crypto_secretbox_BOXZERBYTES of ctxt be all 0.
* first mlen bytes of ctxt will contain the ciphertext.
*/
NAN_METHOD(bind_crypto_secretbox) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(3,"arguments message, nonce, and key must be buffers");
GET_ARG_AS_UCHAR(0, message);
GET_ARG_AS_UCHAR_LEN(1, nonce, crypto_secretbox_NONCEBYTES);
GET_ARG_AS_UCHAR_LEN(2, key, crypto_secretbox_KEYBYTES);
NEW_BUFFER_AND_PTR(pmb, message_size + crypto_secretbox_ZEROBYTES);
// Fill the first crypto_secretbox_ZEROBYTES with 0
unsigned int i;
for(i=0; i < crypto_secretbox_ZEROBYTES; i++) {
pmb_ptr[i] = 0U;
}
//Copy the message to the new buffer
memcpy((void*) (pmb_ptr + crypto_secretbox_ZEROBYTES), (void *) message, message_size);
message_size += crypto_secretbox_ZEROBYTES;
NEW_BUFFER_AND_PTR(ctxt, message_size);
if( crypto_secretbox(ctxt_ptr, pmb_ptr, message_size, nonce, key) == 0) {
NanReturnValue(ctxt);
}
NanReturnValue(NanUndefined());
}
/**
* Decrypts a ciphertext ctxt given the receivers private key, and senders public key.
*
* int crypto_secretbox_open(
* unsigned char *msg,
* const unsigned char *ctxt,
* unsigned long long clen,
* const unsigned char *nonce,
* const unsigned char *key)
*
* Parameters:
* [out] msg the buffer to place resulting plaintext.
* [in] ctxt the ciphertext to be decrypted.
* [in] clen the length of the ciphertext.
* [in] nonce a randomly generated nonce.
* [in] key the shared secret key.
*
* Returns:
* 0 if successful and -1 if verification fails.
*
* Precondition:
* first crypto_secretbox_BOXZEROBYTES of ctxt be all 0.
* the nonce must be of length crypto_secretbox_NONCEBYTES
*
* Postcondition:
* first clen bytes of msg will contain the plaintext.
* first crypto_secretbox_ZEROBYTES of msg will be all 0.
*
* Warning:
* if verification fails msg may contain data from the computation.
*/
NAN_METHOD(bind_crypto_secretbox_open) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(3,"arguments cipherText, nonce, and key must be buffers");
GET_ARG_AS_UCHAR(0, cipher_text);
GET_ARG_AS_UCHAR_LEN(1, nonce, crypto_secretbox_NONCEBYTES);
GET_ARG_AS_UCHAR_LEN(2, key, crypto_secretbox_KEYBYTES);
NEW_BUFFER_AND_PTR(message, cipher_text_size);
// API requires that the first crypto_secretbox_ZEROBYTES of msg be 0 so lets check
if( cipher_text_size < crypto_secretbox_BOXZEROBYTES ) {
std::ostringstream oss;
oss << "argument cipherText must have at least " << crypto_secretbox_BOXZEROBYTES << " bytes";
return NanThrowError(oss.str().c_str());
}
unsigned int i;
for(i=0; i < crypto_secretbox_BOXZEROBYTES; i++) {
if( cipher_text[i] ) break;
}
if( i < crypto_secretbox_BOXZEROBYTES ) {
std::ostringstream oss;
oss << "the first " << crypto_secretbox_BOXZEROBYTES << " bytes of argument cipherText must be 0";
return NanThrowError(oss.str().c_str());
}
if( crypto_secretbox_open(message_ptr, cipher_text, cipher_text_size, nonce, key) == 0) {
// Remove the padding at the beginning of the message
NEW_BUFFER_AND_PTR(plain_text, cipher_text_size - crypto_secretbox_ZEROBYTES);
memcpy(plain_text_ptr,(void*) (message_ptr + crypto_secretbox_ZEROBYTES), cipher_text_size - crypto_secretbox_ZEROBYTES);
NanReturnValue(plain_text);
}
NanReturnValue(NanUndefined());
}
/**
* Signs a given message using the signer's signing key.
*
* int crypto_sign(
* unsigned char * sig,
* unsigned long long * slen,
* const unsigned char * msg,
* unsigned long long mlen,
* const unsigned char * sk)
*
* Parameters:
* [out] sig the resulting signature.
* [out] slen the length of the signature.
* [in] msg the message to be signed.
* [in] mlen the length of the message.
* [in] sk the signing key.
*
* Returns:
* 0 if operation successful
*
* Precondition:
* sig must be of length mlen+crypto_sign_BYTES
* sk must be of length crypto_sign_SECRETKEYBYTES
*/
NAN_METHOD(bind_crypto_sign) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(2,"arguments message, and secretKey must be buffers");
GET_ARG_AS_UCHAR(0, message);
GET_ARG_AS_UCHAR_LEN(1, secretKey, crypto_sign_SECRETKEYBYTES);
NEW_BUFFER_AND_PTR(sig, message_size + crypto_sign_BYTES);
unsigned long long slen = 0;
if( crypto_sign(sig_ptr, &slen, message, message_size, secretKey) == 0) {
NanReturnValue(sig);
}
NanReturnValue(NanUndefined());
}
/**
* Generates a signing/verification key pair.
*
* int crypto_sign_keypair(
* unsigned char * vk,
* unsigned char * sk)
*
* Parameters:
* [out] vk the verification key.
* [out] sk the signing key.
*
* Returns:
* 0 if operation successful.
*
* Precondition:
* the buffer for vk must be at least crypto_sign_PUBLICKEYBYTES in length
* the buffer for sk must be at least crypto_sign_SECRETKEYTBYTES in length
*
* Postcondition:
* first crypto_sign_PUBLICKEYTBYTES of vk will be the key data.
* first crypto_sign_SECRETKEYTBYTES of sk will be the key data.
*/
NAN_METHOD(bind_crypto_sign_keypair) {
NanEscapableScope();
NEW_BUFFER_AND_PTR(vk, crypto_sign_PUBLICKEYBYTES);
NEW_BUFFER_AND_PTR(sk, crypto_sign_SECRETKEYBYTES);
if( crypto_sign_keypair(vk_ptr, sk_ptr) == 0) {
Local<Object> result = NanNew<Object>();
result->Set(NanNew<String>("publicKey"), vk, DontDelete);
result->Set(NanNew<String>("secretKey"), sk, DontDelete);
NanReturnValue(result);
}
NanReturnValue(NanUndefined());
}
/**
* Deterministically generate a signing/verification key pair from a seed.
*
* int crypto_sign_keypair(
* unsigned char * vk,
* unsigned char * sk,
* const unsigned char * ps)
*
* Parameters:
* [out] vk the verification key.
* [out] sk the signing key.
* [in] sd the seed for the key-pair.
*
* Returns:
* 0 if operation successful.
*
* Precondition:
* the buffer for vk must be at least crypto_sign_PUBLICKEYBYTES in length
* the buffer for sk must be at least crypto_sign_SECRETKEYTBYTES in length
* the buffer for sd must be at least crypto_sign_SEEDBYTES in length
*
* Postcondition:
* first crypto_sign_PUBLICKEYTBYTES of vk will be the key data.
* first crypto_sign_SECRETKEYTBYTES of sk will be the key data.
*/
NAN_METHOD(bind_crypto_sign_seed_keypair) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(1,"the argument seed must be a buffer");
GET_ARG_AS_UCHAR_LEN(0, sd, crypto_sign_SEEDBYTES);
NEW_BUFFER_AND_PTR(vk, crypto_sign_PUBLICKEYBYTES);
NEW_BUFFER_AND_PTR(sk, crypto_sign_SECRETKEYBYTES);
if( crypto_sign_seed_keypair(vk_ptr, sk_ptr, sd) == 0) {
Local<Object> result = NanNew<Object>();
result->Set(NanNew<String>("publicKey"), vk, DontDelete);
result->Set(NanNew<String>("secretKey"), sk, DontDelete);
NanReturnValue(result);
}
NanReturnValue(NanUndefined());
}
/**
* Verifies the signed message sig using the signer's verification key.
*
* int crypto_sign_open(
* unsigned char * msg,
* unsigned long long * mlen,
* const unsigned char * sig,
* unsigned long long smlen,
* const unsigned char * vk)
*
* Parameters:
*
* [out] msg the resulting message.
* [out] mlen the length of msg.
* [in] sig the signed message.
* [in] smlen length of the signed message.
* [in] vk the verification key.
*
* Returns:
* 0 if successful, -1 if verification fails.
*
* Precondition:
* length of msg must be at least smlen
*
* Warning:
* if verification fails msg may contain data from the computation.
*/
NAN_METHOD(bind_crypto_sign_open) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(2,"arguments signedMessage and verificationKey must be buffers");
GET_ARG_AS_UCHAR(0, signedMessage);
GET_ARG_AS_UCHAR_LEN(1, publicKey, crypto_sign_PUBLICKEYBYTES);
unsigned long long mlen = 0;
NEW_BUFFER_AND_PTR(msg, signedMessage_size);
if( crypto_sign_open(msg_ptr, &mlen, signedMessage, signedMessage_size, publicKey) == 0) {
NEW_BUFFER_AND_PTR(m, mlen);
memcpy(m_ptr, msg_ptr, mlen);
NanReturnValue(m);
}
NanReturnValue(NanUndefined());
}
/**
* Encrypts a message given the senders secret key, and receivers public key.
* int crypto_box (
* unsigned char * ctxt,
* const unsigned char * msg,
* unsigned long long mlen,
* const unsigned char * nonce,
* const unsigned char * pk,
* const unsigned char * sk)
*
* Parameters:
* [out] ctxt the buffer for the cipher-text.
* [in] msg the message to be encrypted.
* [in] mlen the length of msg.
* [in] nonce a randomly generated nonce.
* [in] pk the receivers public key, used for encryption.
* [in] sk the senders private key, used for signing.
*
* Returns:
* 0 if operation is successful.
*
* Precondition:
* first crypto_box_ZEROBYTES of msg be all 0.
* the nonce must have size crypto_box_NONCEBYTES.
*
* Postcondition:
* first crypto_box_BOXZEROBYTES of ctxt be all 0.
* first mlen bytes of ctxt will contain the ciphertext.
*/
NAN_METHOD(bind_crypto_box) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(4,"arguments message, nonce, publicKey and secretKey must be buffers");
GET_ARG_AS_UCHAR(0, message);
GET_ARG_AS_UCHAR_LEN(1, nonce, crypto_box_NONCEBYTES);
GET_ARG_AS_UCHAR_LEN(2, publicKey, crypto_box_PUBLICKEYBYTES);
GET_ARG_AS_UCHAR_LEN(3, secretKey, crypto_box_SECRETKEYBYTES);
NEW_BUFFER_AND_PTR(msg, message_size + crypto_box_ZEROBYTES);
// Fill the first crypto_box_ZEROBYTES with 0
unsigned int i;
for(i=0; i < crypto_box_ZEROBYTES; i++) {
msg_ptr[i] = 0U;
}
//Copy the message to the new buffer
memcpy((void*) (msg_ptr + crypto_box_ZEROBYTES), (void *) message, message_size);
message_size += crypto_box_ZEROBYTES;
NEW_BUFFER_AND_PTR(ctxt, message_size);
if( crypto_box(ctxt_ptr, msg_ptr, message_size, nonce, publicKey, secretKey) == 0) {
NanReturnValue(ctxt);
}
NanReturnValue(NanUndefined());
}
/**
* Encrypts a message given the senders secret key, and receivers public key.
* int crypto_box_easy (
* unsigned char * ctxt,
* const unsigned char * msg,
* unsigned long long mlen,
* const unsigned char * nonce,
* const unsigned char * pk,
* const unsigned char * sk)
*
* Parameters:
* [out] ctxt the buffer for the cipher-text.
* [in] msg the message to be encrypted.
* [in] mlen the length of msg.
* [in] nonce a randomly generated nonce.
* [in] pk the receivers public key, used for encryption.
* [in] sk the senders private key, used for signing.
*
* Returns:
* 0 if operation is successful.
*
* Precondition:
* the nonce must have size crypto_box_NONCEBYTES.
*
* Postcondition:
* first mlen bytes of ctxt will contain the ciphertext.
*/
NAN_METHOD(bind_crypto_box_easy) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(4,"arguments message, nonce, publicKey and secretKey must be buffers");
GET_ARG_AS_UCHAR(0, message);
GET_ARG_AS_UCHAR_LEN(1, nonce, crypto_box_NONCEBYTES);
GET_ARG_AS_UCHAR_LEN(2, publicKey, crypto_box_PUBLICKEYBYTES);
GET_ARG_AS_UCHAR_LEN(3, secretKey, crypto_box_SECRETKEYBYTES);
NEW_BUFFER_AND_PTR(ctxt, message_size + crypto_box_MACBYTES);
if( crypto_box_easy(ctxt_ptr, message, message_size, nonce, publicKey, secretKey) == 0) {
NanReturnValue(ctxt);
}
NanReturnValue(NanUndefined());
}
/**
* Randomly generates a secret key and a corresponding public key.
*
* int crypto_box_keypair(
* unsigned char * pk,
* unsigned char * sk)
*
* Parameters:
* [out] pk the buffer for the public key with length crypto_box_PUBLICKEYBYTES
* [out] sk the buffer for the private key with length crypto_box_SECRETKEYTBYTES
*
* Returns:
* 0 if generation successful.
*
* Precondition:
* the buffer for pk must be at least crypto_box_PUBLICKEYBYTES in length
* the buffer for sk must be at least crypto_box_SECRETKEYTBYTES in length
*
* Postcondition:
* first crypto_box_PUBLICKEYTBYTES of pk will be the key data.
* first crypto_box_SECRETKEYTBYTES of sk will be the key data.
*/
NAN_METHOD(bind_crypto_box_keypair) {
NanEscapableScope();
NEW_BUFFER_AND_PTR(pk, crypto_box_PUBLICKEYBYTES);
NEW_BUFFER_AND_PTR(sk, crypto_box_SECRETKEYBYTES);
if( crypto_box_keypair(pk_ptr, sk_ptr) == 0) {
Local<Object> result = NanNew<Object>();
result->Set(NanNew<String>("publicKey"), pk, DontDelete);
result->Set(NanNew<String>("secretKey"), sk, DontDelete);
NanReturnValue(result);
}
NanReturnValue(NanUndefined());
}
/**
* Decrypts a ciphertext ctxt given the receivers private key, and senders public key.
*
* int crypto_box_open(
* unsigned char * msg,
* const unsigned char * ctxt,
* unsigned long long clen,
* const unsigned char * nonce,
* const unsigned char * pk,
* const unsigned char * sk)
*
* Parameters:
* [out] msg the buffer to place resulting plaintext.
* [in] ctxt the ciphertext to be decrypted.
* [in] clen the length of the ciphertext.
* [in] nonce a randomly generated.
* [in] pk the senders public key, used for verification.
* [in] sk the receivers private key, used for decryption.
*
Returns:
* 0 if successful and -1 if verification fails.
*
Precondition:
* first crypto_box_BOXZEROBYTES of ctxt be all 0.
* the nonce must have size crypto_box_NONCEBYTES.
*
* Postcondition:
* first clen bytes of msg will contain the plaintext.
* first crypto_box_ZEROBYTES of msg will be all 0.
*/
NAN_METHOD(bind_crypto_box_open) {
NanEscapableScope();
NUMBER_OF_MANDATORY_ARGS(4,"arguments cipherText, nonce, publicKey and secretKey must be buffers");
GET_ARG_AS_UCHAR(0, cipherText);
GET_ARG_AS_UCHAR_LEN(1, nonce, crypto_box_NONCEBYTES);
GET_ARG_AS_UCHAR_LEN(2, publicKey, crypto_box_PUBLICKEYBYTES);
GET_ARG_AS_UCHAR_LEN(3, secretKey, crypto_box_SECRETKEYBYTES);
// API requires that the first crypto_box_BOXZEROBYTES of msg be 0 so lets check
if( cipherText_size < crypto_box_BOXZEROBYTES ) {
std::ostringstream oss;
oss << "argument cipherText must have a length of at least " << crypto_box_BOXZEROBYTES << " bytes";
return NanThrowError(oss.str().c_str());
}
unsigned int i;
for(i=0; i < crypto_box_BOXZEROBYTES; i++) {
if( cipherText[i] ) break;
}