SCM
yacl_scm_gen_p256_key_pair (void)
{
int rc;
uint8_t q[YACL_P256_COORD_SIZE*2];
uint8_t d[YACL_P256_COORD_SIZE];
rc = yacl_create_key_pair(q, d);
SCM qs = scm_c_make_bytevector (YACL_SHA256_LEN*2);
SCM ds = scm_c_make_bytevector (YACL_SHA256_LEN);
memcpy (SCM_BYTEVECTOR_CONTENTS (qs), &q, YACL_SHA256_LEN*2);
memcpy (SCM_BYTEVECTOR_CONTENTS (ds), &d, YACL_SHA256_LEN);
SCM q_list = scm_list_2 (scm_from_locale_symbol ("q"), qs);
SCM d_list = scm_list_2 (scm_from_locale_symbol ("d"), ds);
SCM curve_list = scm_list_2 (scm_from_locale_symbol ("curve"),
scm_from_locale_string("NIST P-256"));
SCM l = scm_list_4 (scm_from_locale_symbol ("ecc"),
curve_list,
q_list,
d_list);
SCM pri_key = scm_list_2 (scm_from_locale_symbol ("private-key"),
l);
return pri_key;
}
SCM DLL_PUBLIC
cl_easy_perform (SCM handle, SCM bvflag, SCM headerflag)
{
handle_post_t *c_handle;
SCM data;
CURLcode status;
struct scm_flag body_sf, header_sf;
SCM_ASSERT (_scm_is_handle (handle), handle, SCM_ARG1, "%curl-easy-perform");
c_handle = _scm_to_handle (handle);
body_sf.flag = scm_is_true (bvflag);
#if SCM_MAJOR_VERSION == 2
if (body_sf.flag)
data = scm_c_make_bytevector (0);
else
data = scm_c_make_string (0, SCM_MAKE_CHAR('\n'));
#else
data = scm_c_make_string (0, SCM_MAKE_CHAR('\n'));
#endif
body_sf.scm = data;
header_sf.flag = 0;
#if SCM_MAJOR_VERSION == 2
if (header_sf.flag)
data = scm_c_make_bytevector (0);
else
data = scm_c_make_string (0, SCM_MAKE_CHAR('\n'));
#else
data = scm_c_make_string (0, SCM_MAKE_CHAR('\n'));
#endif
header_sf.scm = data;
if (scm_is_true (headerflag))
{
curl_easy_setopt (c_handle->handle, CURLOPT_HEADERFUNCTION, write_callback);
curl_easy_setopt (c_handle->handle, CURLOPT_HEADERDATA, &header_sf);
curl_easy_setopt (c_handle->handle, CURLOPT_ERRORBUFFER, error_string);
}
curl_easy_setopt (c_handle->handle, CURLOPT_WRITEFUNCTION, write_callback);
curl_easy_setopt (c_handle->handle, CURLOPT_WRITEDATA, &body_sf);
curl_easy_setopt (c_handle->handle, CURLOPT_ERRORBUFFER, error_string);
/* Do the transfer, and fill c_str with the result */
status = curl_easy_perform (c_handle->handle);
if (status != CURLE_OK)
{
error_code = status;
return (SCM_BOOL_F);
}
if (scm_is_true (headerflag))
return (scm_list_2 (header_sf.scm, body_sf.scm));
return (body_sf.scm);
}
/* Change the size of a port's bytevector to NEW_SIZE. This doesn't
change `read_buf_size'. */
static void
st_resize_port (scm_t_port *pt, scm_t_off new_size)
{
SCM old_stream = SCM_PACK (pt->stream);
const signed char *src = SCM_BYTEVECTOR_CONTENTS (old_stream);
SCM new_stream = scm_c_make_bytevector (new_size);
signed char *dst = SCM_BYTEVECTOR_CONTENTS (new_stream);
unsigned long int old_size = SCM_BYTEVECTOR_LENGTH (old_stream);
unsigned long int min_size = min (old_size, new_size);
scm_t_off offset = pt->write_pos - pt->write_buf;
pt->write_buf_size = new_size;
memcpy (dst, src, min_size);
scm_remember_upto_here_1 (old_stream);
/* reset buffer. */
{
pt->stream = SCM_UNPACK (new_stream);
pt->read_buf = pt->write_buf = (unsigned char *)dst;
pt->read_pos = pt->write_pos = pt->write_buf + offset;
pt->write_end = pt->write_buf + pt->write_buf_size;
pt->read_end = pt->read_buf + pt->read_buf_size;
}
}
SCM scm_gunzip_buf(SCM scm_buf, SCM scm_outlen){
//this should typecheck buf for us
size_t buflen = scm_c_bytevector_length(scm_buf);
uint8_t *buf = (uint8_t*)SCM_BYTEVECTOR_CONTENTS(scm_buf);
size_t outlen = scm_to_size_t(scm_outlen);
uint8_t *out = scm_gc_malloc_pointerless(outlen, SCM_GC_BYTEVECTOR);
z_stream stream = {.next_in = buf, .avail_in = buflen,
.next_out = out, .avail_out = outlen,
.zalloc = NULL, .zfree = NULL, .opaque = NULL};
//15 | 16 means use 15 bits for the decompression window, and only accept
//gzip compressed buffers
inflateInit2(&stream, 15 | 16);
int status = inflate(&stream, Z_FINISH);
if(status != Z_STREAM_END){ //the output buffer was too small
//Do something useful here, for now this just makes sure that
//we don't cause any errors
fprintf(stderr, "Return value was %d, expecting %d\n",
status, Z_FINISH);
scm_gc_free(out, outlen, SCM_GC_BYTEVECTOR);
SCM ret = scm_from_utf8_string(stream.msg);
inflateEnd(&stream);
return ret;
}
//I don't know what the tag bits for a bytevector are so I need to
//make an empty one.
SCM bv = scm_c_make_bytevector(0);
SCM_SET_CELL_WORD_1(bv, stream.total_out);
SCM_SET_CELL_WORD_2(bv, out);
inflateEnd(&stream);
return bv;
}
SCM
yacl_scm_b64url_decode (SCM scmb64)
{
if (!scm_is_string (scmb64))
scm_throw (scm_from_locale_symbol ("BADSTR"), SCM_BOOL_T);
size_t scmb64len, outlen;
char * b64url = scm_to_utf8_stringn (scmb64, &scmb64len);
if (NULL == b64url)
scm_throw (scm_from_locale_symbol ("BADDECODE"), SCM_BOOL_T);
uint8_t *decode = yacl_b64url_decode (b64url, &outlen);
free (b64url);
if (NULL == decode)
scm_throw (scm_from_locale_symbol ("BADDECODED"), SCM_BOOL_T);
SCM b64 = scm_c_make_bytevector (outlen);
memcpy (SCM_BYTEVECTOR_CONTENTS (b64), decode, outlen);
free (decode);
return b64;
}
/* This callback function catches the data passed by libcurl and sends
it back as a scheme string */
static size_t
write_callback (void *ptr, size_t size, size_t nmemb, void *userdata)
{
size_t length1, length2;
SCM data1, data2;
struct scm_flag *sf;
sf = (struct scm_flag *) userdata;
data1 = sf->scm;
#if SCM_MAJOR_VERSION == 2
if (sf->flag)
length1 = scm_c_bytevector_length (data1);
else
length1 = scm_c_string_length (data1);
#else
length1 = scm_c_string_length (data1);
#endif
length2 = size * nmemb;
/* printf ("In write_callback\n"); */
#if SCM_MAJOR_VERSION == 2
if (sf->flag)
{
data2 = scm_c_make_bytevector (length1 + length2);
memcpy (SCM_BYTEVECTOR_CONTENTS (data2),
SCM_BYTEVECTOR_CONTENTS (data1),
length1);
memcpy (SCM_BYTEVECTOR_CONTENTS (data2) + length1,
ptr,
length2);
}
else
{
data2 = scm_c_make_string (length1 + length2, SCM_MAKE_CHAR('\0'));
for (size_t i = 0; i < length1; i ++)
{
scm_c_string_set_x (data2, i, scm_c_string_ref (data1, i));
}
for (size_t i = 0; i < length2; i ++)
{
scm_c_string_set_x (data2, i + length1,
SCM_MAKE_CHAR (((char *)ptr)[i]));
}
}
#else
data2 = scm_c_make_string (length1 + length2, SCM_MAKE_CHAR('\0'));
memcpy (SCM_STRING_CHARS (data2),
SCM_STRING_CHARS (data1),
length1);
memcpy (SCM_STRING_CHARS (data2) + length1,
ptr,
length2);
#endif
sf->scm = data2;
return length2;
}
SCM
yacl_scm_hkdf_sha256 (SCM ikm, SCM salt, SCM info)
{
int rc;
uint8_t * ikm_ptr, *salt_ptr, *info_ptr;
size_t ikm_len, salt_len, info_len;
if (!scm_is_bytevector (ikm))
scm_throw (scm_from_locale_symbol ("BADIKM"), SCM_BOOL_T);
ikm_ptr = SCM_BYTEVECTOR_CONTENTS (ikm);
ikm_len = SCM_BYTEVECTOR_LENGTH (ikm);
if (SCM_UNBNDP (salt))
{
salt_ptr = NULL;
salt_len = 0;
}
else if (!scm_is_bytevector (salt))
scm_throw (scm_from_locale_symbol ("BADSALT"), SCM_BOOL_T);
else
{
salt_ptr = SCM_BYTEVECTOR_CONTENTS(salt);
salt_len = SCM_BYTEVECTOR_LENGTH (salt);
}
if (SCM_UNBNDP (info))
{
info_ptr = NULL;
info_len = 0;
}
else if (!scm_is_bytevector (info))
scm_throw (scm_from_locale_symbol ("BADINFO"), SCM_BOOL_T);
else
{
info_ptr = SCM_BYTEVECTOR_CONTENTS(info);
info_len = SCM_BYTEVECTOR_LENGTH (info);
}
SCM out = scm_c_make_bytevector (YACL_SHA256_LEN);
rc = yacl_hkdf_256(salt_ptr, salt_len,
ikm_ptr, ikm_len,
info_ptr, info_len,
SCM_BYTEVECTOR_CONTENTS (out), YACL_SHA256_LEN);
if (rc)
scm_throw (scm_from_locale_symbol ("BADHKDF"), SCM_BOOL_T);
return out;
}
void test_free_handle_bytevector_postfields(void)
{
extern SCM cl_CURLOPT_POSTFIELDS;
SCM handle = cl_easy_init();
SCM bv = scm_c_make_bytevector (26);
for (int i = 0; i <= 25; i ++)
SCM_BYTEVECTOR_CONTENTS(bv)[i] = i + 'a';
SCM ret = cl_easy_setopt(handle, scm_variable_ref(cl_CURLOPT_POSTFIELDS), bv, SCM_BOOL_F);
gc_free_handle(handle);
}
static SCM
guile_sock_send_buffer (SCM sock)
{
svz_socket_t *xsock;
int i;
SCM bv;
scm_assert_smob_type (guile_svz_socket_tag, sock);
xsock = (svz_socket_t *) SCM_SMOB_DATA (sock);
bv = scm_c_make_bytevector (xsock->send_buffer_fill);
for (i = 0; i < xsock->send_buffer_fill; i ++)
scm_c_bytevector_set_x (bv, i, (xsock->send_buffer[i]));
return bv;
}
SCM
yacl_scm_sha256 (SCM bv)
{
int rc;
uint8_t out[YACL_SHA256_LEN] = {};
signed char* p = SCM_BYTEVECTOR_CONTENTS (bv);
size_t len = SCM_BYTEVECTOR_LENGTH (bv);
rc = yacl_sha256 (p, len, out);
SCM digest = scm_c_make_bytevector (YACL_SHA256_LEN);
memcpy (SCM_BYTEVECTOR_CONTENTS (digest), &out, YACL_SHA256_LEN);
return digest;
}
SCM
yacl_scm_p256_sign(SCM data, SCM d)
{
int rc;
uint8_t out[YACL_SHA256_LEN*2] = {};
unsigned char* data_ptr = SCM_BYTEVECTOR_CONTENTS (data);
size_t data_len = SCM_BYTEVECTOR_LENGTH (data);
unsigned char* d_ptr = SCM_BYTEVECTOR_CONTENTS (d);
size_t d_len = SCM_BYTEVECTOR_LENGTH (d);
rc = yacl_hash_ecdsa_sign(data_ptr, data_len, d_ptr, out);
SCM sig = scm_c_make_bytevector (YACL_SHA256_LEN*2);
memcpy (SCM_BYTEVECTOR_CONTENTS (sig), &out, YACL_SHA256_LEN*2);
return sig;
}
SCM
yacl_scm_get_random (SCM len)
{
if (!scm_is_integer (len))
goto EXCEPTION;
size_t rndlen = scm_to_size_t (len);
SCM rnd = scm_c_make_bytevector (rndlen);
int rc = yacl_get_random(SCM_BYTEVECTOR_CONTENTS (rnd), rndlen);
if (rc)
goto EXCEPTION;
else
goto OUT;
EXCEPTION:
scm_throw (scm_from_locale_symbol ("BADRANDOM"), SCM_BOOL_T);
OUT:
return rnd;
}
/* Return a new string port with MODES. If STR is #f, a new backing
buffer is allocated; otherwise STR must be a string and a copy of it
serves as the buffer for the new port. */
SCM
scm_mkstrport (SCM pos, SCM str, long modes, const char *caller)
{
SCM z, buf;
scm_t_port *pt;
const char *encoding;
size_t read_buf_size, str_len, c_pos;
char *c_buf;
if (!((modes & SCM_WRTNG) || (modes & SCM_RDNG)))
scm_misc_error ("scm_mkstrport", "port must read or write", SCM_EOL);
encoding = scm_i_default_port_encoding ();
if (scm_is_false (str))
{
/* Allocate a new buffer to write to. */
str_len = INITIAL_BUFFER_SIZE;
buf = scm_c_make_bytevector (str_len);
c_buf = (char *) SCM_BYTEVECTOR_CONTENTS (buf);
/* Reset `read_buf_size'. It will contain the actual number of
bytes written to the port. */
read_buf_size = 0;
c_pos = 0;
}
else
{
/* STR is a string. */
char *copy;
SCM_ASSERT (scm_is_string (str), str, SCM_ARG1, caller);
/* Create a copy of STR in ENCODING. */
copy = scm_to_stringn (str, &str_len, encoding,
SCM_FAILED_CONVERSION_ERROR);
buf = scm_c_make_bytevector (str_len);
c_buf = (char *) SCM_BYTEVECTOR_CONTENTS (buf);
memcpy (c_buf, copy, str_len);
free (copy);
c_pos = scm_to_unsigned_integer (pos, 0, str_len);
read_buf_size = str_len;
}
z = scm_c_make_port_with_encoding (scm_tc16_strport, modes,
encoding,
scm_i_default_port_conversion_handler (),
(scm_t_bits)buf);
pt = SCM_PTAB_ENTRY (z);
pt->write_buf = pt->read_buf = (unsigned char *) c_buf;
pt->read_pos = pt->write_pos = pt->read_buf + c_pos;
pt->read_buf_size = read_buf_size;
pt->write_buf_size = str_len;
pt->write_end = pt->read_end = pt->read_buf + pt->read_buf_size;
pt->rw_random = 1;
return z;
}