libcryptx-perl/inc/CryptX_AuthEnc_GCM.xs.inc
2018-03-22 15:51:09 +01:00

185 lines
5.3 KiB
C++

MODULE = CryptX PACKAGE = Crypt::AuthEnc::GCM
Crypt::AuthEnc::GCM
_new(char * cipher_name, SV * key, SV * nonce = NULL)
CODE:
{
STRLEN k_len = 0, iv_len = 0;
unsigned char *k = NULL, *iv = NULL;
int id, rv;
if (!SvPOK(key)) croak("FATAL: key must be string/buffer scalar");
k = (unsigned char *) SvPVbyte(key, k_len);
if (nonce) {
if (!SvPOK(nonce)) croak("FATAL: nonce must be string/buffer scalar");
iv = (unsigned char *)SvPVbyte(nonce, iv_len);
}
id = find_cipher(cipher_name);
if (id == -1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
Newz(0, RETVAL, 1, struct gcm_struct);
if (!RETVAL) croak("FATAL: Newz failed");
rv = gcm_init(&RETVAL->state, id, k, (unsigned long)k_len);
if (rv != CRYPT_OK) croak("FATAL: gcm_init failed: %s", error_to_string(rv));
if (iv && iv_len > 0) {
rv = gcm_add_iv(&RETVAL->state, iv, (unsigned long)iv_len);
if (rv != CRYPT_OK) croak("FATAL: gcm_add_iv failed: %s", error_to_string(rv));
}
}
OUTPUT:
RETVAL
void
DESTROY(Crypt::AuthEnc::GCM self)
CODE:
Safefree(self);
Crypt::AuthEnc::GCM
clone(Crypt::AuthEnc::GCM self)
CODE:
Newz(0, RETVAL, 1, struct gcm_struct);
if (!RETVAL) croak("FATAL: Newz failed");
Copy(&self->state, &RETVAL->state, 1, struct gcm_struct);
OUTPUT:
RETVAL
int
reset(Crypt::AuthEnc::GCM self)
CODE:
{
int rv;
rv = gcm_reset(&self->state);
if (rv != CRYPT_OK) croak("FATAL: gcm_reset failed: %s", error_to_string(rv));
RETVAL = rv;
}
OUTPUT:
RETVAL
SV *
encrypt_add(Crypt::AuthEnc::GCM self, SV * data)
CODE:
{
int rv;
STRLEN in_data_len;
unsigned char *in_data, *out_data;
in_data = (unsigned char *)SvPVbyte(data, in_data_len);
if (in_data_len==0) {
RETVAL = newSVpvn("", 0);
}
else
{
RETVAL = NEWSV(0, in_data_len);
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, in_data_len);
out_data = (unsigned char *)SvPV_nolen(RETVAL);
rv = gcm_process(&self->state, in_data, (unsigned long)in_data_len, out_data, GCM_ENCRYPT);
if (rv != CRYPT_OK) croak("FATAL: encrypt_add/gcm_process failed: %s", error_to_string(rv));
}
}
OUTPUT:
RETVAL
int
iv_add(Crypt::AuthEnc::GCM self, SV * data)
CODE:
{
int rv;
STRLEN in_data_len;
unsigned char *in_data;
in_data = (unsigned char *)SvPVbyte(data, in_data_len);
rv = gcm_add_iv(&self->state, in_data, (unsigned long)in_data_len);
if (rv != CRYPT_OK) croak("FATAL: gcm_add_iv failed: %s", error_to_string(rv));
RETVAL = rv;
}
OUTPUT:
RETVAL
int
adata_add(Crypt::AuthEnc::GCM self, SV * data)
CODE:
{
int rv;
STRLEN in_data_len;
unsigned char *in_data;
in_data = (unsigned char *)SvPVbyte(data, in_data_len);
rv = gcm_add_aad(&self->state, in_data, (unsigned long)in_data_len);
if (rv != CRYPT_OK) croak("FATAL: gcm_add_aad failed: %s", error_to_string(rv));
RETVAL = rv;
}
OUTPUT:
RETVAL
SV *
decrypt_add(Crypt::AuthEnc::GCM self, SV * data)
CODE:
{
int rv;
STRLEN in_data_len;
unsigned char *in_data, *out_data;
in_data = (unsigned char *)SvPVbyte(data, in_data_len);
if (in_data_len==0) {
RETVAL = newSVpvn("", 0);
}
else {
RETVAL = NEWSV(0, in_data_len);
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, in_data_len);
out_data = (unsigned char *)SvPV_nolen(RETVAL);
rv = gcm_process(&self->state, out_data, (unsigned long)in_data_len, in_data, GCM_DECRYPT);
if (rv != CRYPT_OK) croak("FATAL: encrypt_add/gcm_process failed: %s", error_to_string(rv));
}
}
OUTPUT:
RETVAL
void
encrypt_done(Crypt::AuthEnc::GCM self)
PPCODE:
{
int rv;
unsigned char tag[MAXBLOCKSIZE];
unsigned long tag_len = sizeof(tag);
rv = gcm_done(&self->state, tag, &tag_len);
if (rv != CRYPT_OK) croak("FATAL: gcm_done failed: %s", error_to_string(rv));
XPUSHs(sv_2mortal(newSVpvn((char*)tag, tag_len)));
}
void
decrypt_done(Crypt::AuthEnc::GCM self, ...)
PPCODE:
{
int rv;
unsigned char tag[MAXBLOCKSIZE];
unsigned long tag_len = sizeof(tag);
STRLEN expected_tag_len;
unsigned char *expected_tag;
rv = gcm_done(&self->state, tag, &tag_len);
if (rv != CRYPT_OK) croak("FATAL: gcm_done failed: %s", error_to_string(rv));
if (items == 1) {
XPUSHs(sv_2mortal(newSVpvn((char*)tag, tag_len)));
}
else {
if(!SvPOK(ST(1))) croak("FATAL: expected_tag must be string/buffer scalar");
expected_tag = (unsigned char *) SvPVbyte(ST(1), expected_tag_len);
if (expected_tag_len!=tag_len) {
XPUSHs(sv_2mortal(newSViv(0))); /* false */
}
else if (memNE(expected_tag, tag, tag_len)) {
XPUSHs(sv_2mortal(newSViv(0))); /* false */
}
else {
XPUSHs(sv_2mortal(newSViv(1))); /* true */
}
}
}