235 lines
7.8 KiB
C++
235 lines
7.8 KiB
C++
MODULE = CryptX PACKAGE = Crypt::AuthEnc::EAX
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PROTOTYPES: DISABLE
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Crypt::AuthEnc::EAX
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new(Class, char * cipher_name, SV * key, SV * nonce, SV * adata=&PL_sv_undef)
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CODE:
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{
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STRLEN k_len=0;
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unsigned char *k=NULL;
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unsigned char *n=NULL;
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STRLEN n_len=0;
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unsigned char *h=NULL;
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STRLEN h_len=0;
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int rv, id;
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if (!SvPOK(key)) croak("FATAL: key must be string/buffer scalar");
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k = (unsigned char *) SvPVbyte(key, k_len);
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if (!SvPOK(nonce)) croak("FATAL: nonce must be string/buffer scalar");
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n = (unsigned char *) SvPVbyte(nonce, n_len);
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if (SvOK(adata)) { /* adata is optional param */
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if (!SvPOK(adata)) croak("FATAL: adata must be string/buffer scalar");
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h = (unsigned char *) SvPVbyte(adata, h_len);
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}
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id = _find_cipher(cipher_name);
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if (id == -1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
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Newz(0, RETVAL, 1, eax_state);
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if (!RETVAL) croak("FATAL: Newz failed");
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rv = eax_init(RETVAL, id, k, (unsigned long)k_len, n, (unsigned long)n_len, h, (unsigned long)h_len);
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if (rv != CRYPT_OK) {
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Safefree(RETVAL);
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croak("FATAL: eax setup failed: %s", error_to_string(rv));
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}
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}
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OUTPUT:
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RETVAL
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void
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DESTROY(Crypt::AuthEnc::EAX self)
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CODE:
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Safefree(self);
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Crypt::AuthEnc::EAX
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clone(Crypt::AuthEnc::EAX self)
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CODE:
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Newz(0, RETVAL, 1, eax_state);
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if (!RETVAL) croak("FATAL: Newz failed");
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Copy(self, RETVAL, 1, eax_state);
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OUTPUT:
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RETVAL
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SV *
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encrypt_add(Crypt::AuthEnc::EAX self, SV * data)
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CODE:
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{
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int rv;
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STRLEN in_data_len;
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unsigned char *in_data, *out_data;
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in_data = (unsigned char *)SvPVbyte(data, in_data_len);
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if (in_data_len == 0) {
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RETVAL = newSVpvn("", 0);
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}
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else {
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RETVAL = NEWSV(0, in_data_len); /* avoid zero! */
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SvPOK_only(RETVAL);
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SvCUR_set(RETVAL, in_data_len);
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out_data = (unsigned char *)SvPVX(RETVAL);
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rv = eax_encrypt(self, in_data, out_data, (unsigned long)in_data_len);
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if (rv != CRYPT_OK) {
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SvREFCNT_dec(RETVAL);
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croak("FATAL: eax_encrypt failed: %s", error_to_string(rv));
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}
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}
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}
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OUTPUT:
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RETVAL
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SV *
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decrypt_add(Crypt::AuthEnc::EAX self, SV * data)
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CODE:
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{
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int rv;
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STRLEN in_data_len;
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unsigned char *in_data, *out_data;
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in_data = (unsigned char *)SvPVbyte(data, in_data_len);
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if (in_data_len == 0) {
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RETVAL = newSVpvn("", 0);
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}
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else {
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RETVAL = NEWSV(0, in_data_len); /* avoid zero! */
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SvPOK_only(RETVAL);
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SvCUR_set(RETVAL, in_data_len);
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out_data = (unsigned char *)SvPVX(RETVAL);
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rv = eax_decrypt(self, in_data, out_data, (unsigned long)in_data_len);
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if (rv != CRYPT_OK) {
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SvREFCNT_dec(RETVAL);
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croak("FATAL: eax_decrypt failed: %s", error_to_string(rv));
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}
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}
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}
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OUTPUT:
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RETVAL
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void
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encrypt_done(Crypt::AuthEnc::EAX self)
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PPCODE:
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{
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int rv;
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unsigned char tag[MAXBLOCKSIZE];
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unsigned long tag_len = sizeof(tag);
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rv = eax_done(self, tag, &tag_len);
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if (rv != CRYPT_OK) croak("FATAL: eax_done failed: %s", error_to_string(rv));
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XPUSHs(sv_2mortal(newSVpvn((char*)tag, tag_len)));
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}
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void
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decrypt_done(Crypt::AuthEnc::EAX self, ...)
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PPCODE:
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{
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int rv;
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unsigned char tag[MAXBLOCKSIZE];
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unsigned long tag_len = sizeof(tag);
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STRLEN expected_tag_len;
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unsigned char *expected_tag;
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rv = eax_done(self, tag, &tag_len);
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if (rv != CRYPT_OK) croak("FATAL: eax_done failed: %s", error_to_string(rv));
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if (items == 1) {
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XPUSHs(sv_2mortal(newSVpvn((char*)tag, tag_len)));
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}
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else {
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if (!SvPOK(ST(1))) croak("FATAL: expected_tag must be string/buffer scalar");
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expected_tag = (unsigned char *) SvPVbyte(ST(1), expected_tag_len);
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if (expected_tag_len!=tag_len) {
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XPUSHs(sv_2mortal(newSViv(0))); /* false */
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}
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else if (memNE(expected_tag, tag, tag_len)) {
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XPUSHs(sv_2mortal(newSViv(0))); /* false */
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}
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else {
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XPUSHs(sv_2mortal(newSViv(1))); /* true */
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}
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}
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}
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void
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adata_add(Crypt::AuthEnc::EAX self, SV * adata)
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PPCODE:
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{
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STRLEN h_len;
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int rv;
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unsigned char *h;
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h = (unsigned char *)SvPVbyte(adata, h_len);
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rv = eax_addheader(self, h, (unsigned long)h_len);
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if (rv != CRYPT_OK) croak("FATAL: eax_addheader failed: %s", error_to_string(rv));
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XPUSHs(ST(0)); /* return self */
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}
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void
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eax_encrypt_authenticate(char *cipher_name, SV *key, SV *nonce, SV *header, SV *plaintext)
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PPCODE:
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{
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STRLEN k_len = 0, n_len = 0, h_len = 0, pt_len = 0;
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unsigned char *k = NULL, *n = NULL, *h = NULL, *pt = NULL;
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int rv, id;
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unsigned char tag[MAXBLOCKSIZE];
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unsigned long tag_len = sizeof(tag);
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SV *output;
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if (SvPOK(key)) k = (unsigned char *) SvPVbyte(key, k_len);
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if (SvPOK(nonce)) n = (unsigned char *) SvPVbyte(nonce, n_len);
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if (SvPOK(plaintext)) pt = (unsigned char *) SvPVbyte(plaintext, pt_len);
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if (SvPOK(header)) h = (unsigned char *) SvPVbyte(header, h_len);
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id = _find_cipher(cipher_name);
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if(id==-1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
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output = NEWSV(0, pt_len > 0 ? pt_len : 1); /* avoid zero! */
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SvPOK_only(output);
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SvCUR_set(output, pt_len);
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rv = eax_encrypt_authenticate_memory(id, k, (unsigned long)k_len, n, (unsigned long)n_len,
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h, (unsigned long)h_len, pt, (unsigned long)pt_len,
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(unsigned char *)SvPVX(output), tag, &tag_len);
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if (rv != CRYPT_OK) {
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SvREFCNT_dec(output);
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croak("FATAL: ccm_memory failed: %s", error_to_string(rv));
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}
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XPUSHs(sv_2mortal(output));
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XPUSHs(sv_2mortal(newSVpvn((char*)tag, tag_len)));
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}
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void
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eax_decrypt_verify(char *cipher_name, SV *key, SV *nonce, SV *header, SV *ciphertext, SV *tagsv)
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PPCODE:
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{
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STRLEN k_len = 0, n_len = 0, h_len = 0, ct_len = 0, t_len = 0;
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unsigned char *k = NULL, *n = NULL, *h = NULL, *ct = NULL, *t = NULL;
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int rv, id, stat = 0;
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unsigned char tag[MAXBLOCKSIZE];
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unsigned long tag_len;
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SV *output;
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if (SvPOK(key)) k = (unsigned char *) SvPVbyte(key, k_len);
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if (SvPOK(nonce)) n = (unsigned char *) SvPVbyte(nonce, n_len);
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if (SvPOK(ciphertext)) ct = (unsigned char *) SvPVbyte(ciphertext, ct_len);
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if (SvPOK(tagsv)) t = (unsigned char *) SvPVbyte(tagsv, t_len);
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if (SvPOK(header)) h = (unsigned char *) SvPVbyte(header, h_len);
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id = _find_cipher(cipher_name);
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if(id==-1) croak("FATAL: find_cipfer failed for '%s'", cipher_name);
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output = NEWSV(0, ct_len > 0 ? ct_len : 1); /* avoid zero! */
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SvPOK_only(output);
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SvCUR_set(output, ct_len);
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tag_len = (unsigned long)t_len;
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Copy(t, tag, t_len, unsigned char);
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rv = eax_decrypt_verify_memory(id, k, (unsigned long)k_len, n, (unsigned long)n_len, h, (unsigned long)h_len,
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ct, (unsigned long)ct_len, (unsigned char *)SvPVX(output), tag, tag_len, &stat);
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if (rv != CRYPT_OK || stat != 1) {
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SvREFCNT_dec(output);
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XPUSHs(sv_2mortal(newSVpvn(NULL,0))); /* undef */
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}
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else {
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XPUSHs(sv_2mortal(output));
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}
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}
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