MODULE = CryptX PACKAGE = Crypt::AuthEnc::CCM
Crypt::AuthEnc::CCM
_new(char * cipher_name, SV * key, SV * nonce, SV * adata, int tag_len, int pt_len)
CODE:
{
unsigned char *k=NULL;
STRLEN k_len=0;
unsigned char *n=NULL;
STRLEN n_len=0;
unsigned char *h=NULL;
STRLEN h_len=0;
int rv, id;
if (tag_len < 1 || tag_len > MAXBLOCKSIZE) croak("FATAL: invalid tag_len %d", tag_len);
if (pt_len < 0) croak("FATAL: invalid pt_len");
if (!SvPOK(key)) croak("FATAL: key must be string/buffer scalar");
k = (unsigned char *) SvPVbyte(key, k_len);
if (!SvPOK(nonce)) croak("FATAL: nonce must be string/buffer scalar");
n = (unsigned char *) SvPVbyte(nonce, n_len);
if (!SvPOK(adata)) croak("FATAL: adata must be string/buffer scalar");
h = (unsigned char *) SvPVbyte(adata, h_len);
id = find_cipher(cipher_name);
if (id == -1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
Newz(0, RETVAL, 1, struct ccm_struct);
if (!RETVAL) croak("FATAL: Newz failed");
rv = ccm_init(&RETVAL->state, id, k, (unsigned long)k_len, pt_len, tag_len, h_len);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: ccm_init failed: %s", error_to_string(rv));
}
rv = ccm_add_nonce(&RETVAL->state, n, (unsigned long)n_len);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: ccm_add_nonce failed: %s", error_to_string(rv));
}
rv = ccm_add_aad(&RETVAL->state, h, (unsigned long)h_len);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: ccm_add_aad failed: %s", error_to_string(rv));
}
RETVAL->direction = -1;
RETVAL->tag_len = tag_len;
RETVAL->pt_len = pt_len;
}
OUTPUT:
RETVAL
void
DESTROY(Crypt::AuthEnc::CCM self)
CODE:
Safefree(self);
Crypt::AuthEnc::CCM
clone(Crypt::AuthEnc::CCM self)
CODE:
Newz(0, RETVAL, 1, struct ccm_struct);
if (!RETVAL) croak("FATAL: Newz failed");
Copy(&self->state, &RETVAL->state, 1, struct ccm_struct);
OUTPUT:
RETVAL
SV *
encrypt_add(Crypt::AuthEnc::CCM 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 {
if (self->direction == -1) self->direction = CCM_ENCRYPT;
if (self->direction != CCM_ENCRYPT) {
croak("FATAL: encrypt_add failed: wrong direction");
}
if (self->pt_len < in_data_len) croak("FATAL: encrypt_add failed: pt_len mismatch");
RETVAL = NEWSV(0, in_data_len);
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, in_data_len);
out_data = (unsigned char *)SvPVX(RETVAL);
rv = ccm_process(&self->state, in_data, (unsigned long)in_data_len, out_data, self->direction);
if (rv != CRYPT_OK) {
SvREFCNT_dec(RETVAL);
croak("FATAL: ccm_process failed: %s", error_to_string(rv));
}
self->pt_len -= in_data_len;
}
}
OUTPUT:
RETVAL
SV *
decrypt_add(Crypt::AuthEnc::CCM self, SV * data)
CODE:
{
int rv, i;
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 {
if (self->direction == -1) self->direction = CCM_DECRYPT;
if (self->direction != CCM_DECRYPT) {
croak("FATAL: decrypt_add failed: wrong direction");
}
if (self->pt_len < in_data_len) croak("FATAL: decrypt_add failed: pt_len mismatch");
RETVAL = NEWSV(0, in_data_len);
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, in_data_len);
out_data = (unsigned char *)SvPVX(RETVAL);
rv = ccm_process(&self->state, out_data, (unsigned long)in_data_len, in_data, CCM_DECRYPT);
if (rv != CRYPT_OK) {
SvREFCNT_dec(RETVAL);
croak("FATAL: ccm_process failed: %s", error_to_string(rv));
}
self->pt_len -= in_data_len;
}
}
OUTPUT:
RETVAL
void
encrypt_done(Crypt::AuthEnc::CCM self)
PPCODE:
{
int rv;
unsigned char tag[MAXBLOCKSIZE];
unsigned long tag_len = self->tag_len;
if (self->direction != CCM_ENCRYPT) {
croak("FATAL: encrypt_done failed: wrong direction");
}
if (self->pt_len != 0) croak("FATAL: encrypt_done failed: pt_len mismatch");
rv = ccm_done(&self->state, tag, &tag_len);
if (rv != CRYPT_OK) croak("FATAL: ccm_done failed: %s", error_to_string(rv));
XPUSHs(sv_2mortal(newSVpvn((char*)tag, tag_len)));
}
void
decrypt_done(Crypt::AuthEnc::CCM self, ...)
PPCODE:
{
int rv;
unsigned char tag[MAXBLOCKSIZE];
unsigned long tag_len = self->tag_len;
STRLEN expected_tag_len;
unsigned char *expected_tag;
if (self->direction != CCM_DECRYPT) {
croak("FATAL: decrypt_done failed: wrong direction");
}
if (self->pt_len != 0) croak("FATAL: decrypt_done failed: pt_len mismatch");
rv = ccm_done(&self->state, tag, &tag_len);
if (rv != CRYPT_OK) croak("FATAL: ccm_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 */
}
}
}