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MODULE = CryptX PACKAGE = Crypt::AuthEnc::OCB
Crypt::AuthEnc::OCB
_new(char * cipher_name, SV * key, SV * nonce)
CODE:
{
STRLEN k_len=0;
unsigned char *k=NULL;
unsigned char *n=NULL;
STRLEN n_len=0;
int id;
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);
id = find_cipher(cipher_name);
if(id==-1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
Newz(0, RETVAL, 1, struct ocb_struct);
if (!RETVAL) croak("FATAL: Newz failed");
if (ocb3_init(&RETVAL->state, id, k, (unsigned long)k_len, n, (unsigned long)n_len) != CRYPT_OK) {
croak("FATAL: ocb setup failed");
}
}
OUTPUT:
RETVAL
void
DESTROY(Crypt::AuthEnc::OCB self)
CODE:
Safefree(self);
Crypt::AuthEnc::OCB
clone(Crypt::AuthEnc::OCB self)
CODE:
Newz(0, RETVAL, 1, struct ocb_struct);
if (!RETVAL) croak("FATAL: Newz failed");
Copy(&self->state, &RETVAL->state, 1, struct ocb_struct);
OUTPUT:
RETVAL
void
aad_add(Crypt::AuthEnc::OCB self, SV * data)
CODE:
{
int rv;
STRLEN in_data_len;
unsigned char *in_data;
in_data = (unsigned char *)SvPVbyte(data, in_data_len);
if (in_data_len>0) {
rv = ocb3_add_aad(&self->state, in_data, (unsigned long)in_data_len);
if (rv != CRYPT_OK) croak("FATAL: ocb3_add_aad failed: %s", error_to_string(rv));
}
}
SV *
encrypt_add(Crypt::AuthEnc::OCB 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);
if (in_data_len % (&self->state)->block_len)
croak ("FATAL: sizeof(data) should be multiple of blocksize (%d)", (&self->state)->block_len);
rv = ocb3_encrypt(&self->state, in_data, (unsigned long)in_data_len, out_data);
if (rv != CRYPT_OK) croak("FATAL: ocb3_encrypt failed: %s", error_to_string(rv));
}
}
OUTPUT:
RETVAL
SV *
encrypt_last(Crypt::AuthEnc::OCB 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 = NEWSV(0, in_data_len);
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, in_data_len);
out_data = (unsigned char *)SvPV_nolen(RETVAL);
}
else {
RETVAL = newSVpvn("", 0);
out_data = NULL;
}
rv = ocb3_encrypt_last(&self->state, in_data, (unsigned long)in_data_len, out_data);
if (rv != CRYPT_OK) croak("FATAL: ocb3_encrypt_last failed: %s", error_to_string(rv));
}
OUTPUT:
RETVAL
SV *
decrypt_add(Crypt::AuthEnc::OCB 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);
if (in_data_len % (&self->state)->block_len)
croak ("FATAL: sizeof(data) should be multiple of blocksize (%d)", (&self->state)->block_len);
rv = ocb3_decrypt(&self->state, in_data, (unsigned long)in_data_len, out_data);
if (rv != CRYPT_OK) croak("FATAL: ocb3_decrypt failed: %s", error_to_string(rv));
}
}
OUTPUT:
RETVAL
SV *
decrypt_last(Crypt::AuthEnc::OCB 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 = NEWSV(0, in_data_len);
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, in_data_len);
out_data = (unsigned char *)SvPV_nolen(RETVAL);
}
else {
RETVAL = newSVpvn("", 0);
out_data = NULL;
}
rv = ocb3_decrypt_last(&self->state, in_data, (unsigned long)in_data_len, out_data);
if (rv != CRYPT_OK) croak("FATAL: ocb3_encrypt_last failed: %s", error_to_string(rv));
}
OUTPUT:
RETVAL
void
encrypt_done(Crypt::AuthEnc::OCB self)
PPCODE:
{
int rv;
unsigned char tag[MAXBLOCKSIZE];
unsigned long tag_len = sizeof(tag);
rv = ocb3_done(&self->state, tag, &tag_len);
if (rv != CRYPT_OK) croak("FATAL: ocb3_done_encrypt failed: %s", error_to_string(rv));
XPUSHs(sv_2mortal(newSVpvn((char*)tag, tag_len)));
}
void
decrypt_done(Crypt::AuthEnc::OCB self, ...)
PPCODE:
{
int rv;
unsigned char tag[MAXBLOCKSIZE];
unsigned long tag_len = sizeof(tag);
STRLEN expected_tag_len;
unsigned char *expected_tag;
rv = ocb3_done(&self->state, tag, &tag_len);
if (rv != CRYPT_OK) croak("FATAL: ocb3_done_decrypt 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 */
}
}
}
int
blocksize(Crypt::AuthEnc::OCB self)
CODE:
{
RETVAL = (&self->state)->block_len;
}
OUTPUT:
RETVAL
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