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MODULE = CryptX PACKAGE = Crypt::AuthEnc::GCM
PROTOTYPES: DISABLE
Crypt::AuthEnc::GCM
new(Class, 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_spec(key)) croak("FATAL: key must be string/buffer scalar");
k = (unsigned char *) SvPVbyte(key, k_len);
if (nonce) {
if (!SvPOK_spec(nonce)) croak("FATAL: nonce must be string/buffer scalar");
iv = (unsigned char *)SvPVbyte(nonce, iv_len);
}
id = cryptx_internal_find_cipher(cipher_name);
if (id == -1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
Newz(0, RETVAL, 1, gcm_state);
if (!RETVAL) croak("FATAL: Newz failed");
rv = gcm_init(RETVAL, id, k, (unsigned long)k_len);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: gcm_init failed: %s", error_to_string(rv));
}
if (iv && iv_len > 0) {
rv = gcm_add_iv(RETVAL, iv, (unsigned long)iv_len);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
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, gcm_state);
if (!RETVAL) croak("FATAL: Newz failed");
Copy(self, RETVAL, 1, gcm_state);
OUTPUT:
RETVAL
void
reset(Crypt::AuthEnc::GCM self)
PPCODE:
{
int rv;
rv = gcm_reset(self);
if (rv != CRYPT_OK) croak("FATAL: gcm_reset failed: %s", error_to_string(rv));
XPUSHs(ST(0)); /* return self */
}
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); /* avoid zero! */
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, in_data_len);
out_data = (unsigned char *)SvPVX(RETVAL);
rv = gcm_process(self, in_data, (unsigned long)in_data_len, out_data, GCM_ENCRYPT);
if (rv != CRYPT_OK) {
SvREFCNT_dec(RETVAL);
croak("FATAL: encrypt_add/gcm_process failed: %s", error_to_string(rv));
}
}
}
OUTPUT:
RETVAL
void
iv_add(Crypt::AuthEnc::GCM self, SV * data)
PPCODE:
{
int rv;
STRLEN in_data_len;
unsigned char *in_data;
in_data = (unsigned char *)SvPVbyte(data, in_data_len);
rv = gcm_add_iv(self, in_data, (unsigned long)in_data_len);
if (rv != CRYPT_OK) croak("FATAL: gcm_add_iv failed: %s", error_to_string(rv));
XPUSHs(ST(0)); /* return self */
}
void
adata_add(Crypt::AuthEnc::GCM self, SV * data)
PPCODE:
{
int rv;
STRLEN in_data_len;
unsigned char *in_data;
in_data = (unsigned char *)SvPVbyte(data, in_data_len);
rv = gcm_add_aad(self, in_data, (unsigned long)in_data_len);
if (rv != CRYPT_OK) croak("FATAL: gcm_add_aad failed: %s", error_to_string(rv));
XPUSHs(ST(0)); /* return self */
}
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); /* avoid zero! */
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, in_data_len);
out_data = (unsigned char *)SvPVX(RETVAL);
rv = gcm_process(self, out_data, (unsigned long)in_data_len, in_data, GCM_DECRYPT);
if (rv != CRYPT_OK) {
SvREFCNT_dec(RETVAL);
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, 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, 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_spec(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 */
}
}
}
void
gcm_encrypt_authenticate(char *cipher_name, SV *key, SV *nonce, SV *header = NULL, SV *plaintext)
PPCODE:
{
STRLEN k_len = 0, n_len = 0, h_len = 0, pt_len = 0;
unsigned char *k = NULL, *n = NULL, *h = NULL, *pt = NULL;
int rv, id;
unsigned char tag[MAXBLOCKSIZE];
unsigned long tag_len = sizeof(tag);
SV *output;
if (SvPOK(key)) k = (unsigned char *) SvPVbyte(key, k_len);
if (SvPOK(nonce)) n = (unsigned char *) SvPVbyte(nonce, n_len);
if (SvPOK(plaintext)) pt = (unsigned char *) SvPVbyte(plaintext, pt_len);
if (SvPOK(header)) h = (unsigned char *) SvPVbyte(header, h_len);
id = cryptx_internal_find_cipher(cipher_name);
if(id==-1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
output = NEWSV(0, pt_len > 0 ? pt_len : 1); /* avoid zero! */
SvPOK_only(output);
SvCUR_set(output, pt_len);
rv = gcm_memory(id, k, (unsigned long)k_len, n, (unsigned long)n_len, h, (unsigned long)h_len,
pt, (unsigned long)pt_len, (unsigned char *)SvPVX(output), tag, &tag_len, GCM_ENCRYPT);
if (rv != CRYPT_OK) {
SvREFCNT_dec(output);
croak("FATAL: ccm_memory failed: %s", error_to_string(rv));
}
XPUSHs(sv_2mortal(output));
XPUSHs(sv_2mortal(newSVpvn((char*)tag, tag_len)));
}
void
gcm_decrypt_verify(char *cipher_name, SV *key, SV *nonce, SV *header, SV *ciphertext, SV *tagsv)
PPCODE:
{
STRLEN k_len = 0, n_len = 0, h_len = 0, ct_len = 0, t_len = 0;
unsigned char *k = NULL, *n = NULL, *h = NULL, *ct = NULL, *t = NULL;
int rv, id;
unsigned char tag[MAXBLOCKSIZE];
unsigned long tag_len;
SV *output;
if (SvPOK(key)) k = (unsigned char *) SvPVbyte(key, k_len);
if (SvPOK(nonce)) n = (unsigned char *) SvPVbyte(nonce, n_len);
if (SvPOK(ciphertext)) ct = (unsigned char *) SvPVbyte(ciphertext, ct_len);
if (SvPOK(tagsv)) t = (unsigned char *) SvPVbyte(tagsv, t_len);
if (SvPOK(header)) h = (unsigned char *) SvPVbyte(header, h_len);
id = cryptx_internal_find_cipher(cipher_name);
if(id==-1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
output = NEWSV(0, ct_len > 0 ? ct_len : 1); /* avoid zero! */
SvPOK_only(output);
SvCUR_set(output, ct_len);
tag_len = (unsigned long)t_len;
Copy(t, tag, t_len, unsigned char);
rv = gcm_memory(id, k, (unsigned long)k_len, n, (unsigned long)n_len, h, (unsigned long)h_len,
(unsigned char *)SvPVX(output), (unsigned long)ct_len, ct, tag, &tag_len, GCM_DECRYPT);
if (rv != CRYPT_OK) {
SvREFCNT_dec(output);
XPUSHs(sv_2mortal(newSVpvn(NULL,0))); /* undef */
}
else {
XPUSHs(sv_2mortal(output));
}
}
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