libcryptx-perl/inc/CryptX_Stream_ChaCha.xs.inc

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MODULE = CryptX PACKAGE = Crypt::Stream::ChaCha
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PROTOTYPES: DISABLE
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Crypt::Stream::ChaCha
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new(Class, SV * key, SV * nonce, UV counter = 0, int rounds = 20)
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CODE:
{
int rv;
STRLEN iv_len=0, k_len=0;
unsigned char *iv=NULL, *k=NULL;
if (!SvPOK(key)) croak("FATAL: key must be string/buffer scalar");
if (!SvPOK(nonce)) croak("FATAL: nonce must be string/buffer scalar");
k = (unsigned char *) SvPVbyte(key, k_len);
iv = (unsigned char *) SvPVbyte(nonce, iv_len);
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Newz(0, RETVAL, 1, chacha_state);
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if (!RETVAL) croak("FATAL: Newz failed");
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rv = chacha_setup(RETVAL, k, (unsigned long)k_len, rounds);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: chacha_setup failed: %s", error_to_string(rv));
}
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if (iv_len == 12) {
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rv = chacha_ivctr32(RETVAL, iv, (unsigned long)iv_len, (ulong32)counter);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: chacha_ivctr32 failed: %s", error_to_string(rv));
}
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}
else if (iv_len == 8) {
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rv = chacha_ivctr64(RETVAL, iv, (unsigned long)iv_len, (ulong64)counter);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: chacha_ivctr64 failed: %s", error_to_string(rv));
}
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}
else {
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Safefree(RETVAL);
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croak("FATAL: chacha IV length must be 8 or 12 bytes");
}
}
OUTPUT:
RETVAL
void
DESTROY(Crypt::Stream::ChaCha self)
CODE:
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chacha_done(self);
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Safefree(self);
Crypt::Stream::ChaCha
clone(Crypt::Stream::ChaCha self)
CODE:
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Newz(0, RETVAL, 1, chacha_state);
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if (!RETVAL) croak("FATAL: Newz failed");
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Copy(self, RETVAL, 1, chacha_state);
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OUTPUT:
RETVAL
SV *
keystream(Crypt::Stream::ChaCha self, STRLEN out_len)
CODE:
{
int rv;
unsigned char *out_data;
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if (out_len == 0) {
RETVAL = newSVpvn("", 0);
}
else {
RETVAL = NEWSV(0, out_len); /* avoid zero! */
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, out_len);
out_data = (unsigned char *)SvPVX(RETVAL);
rv = chacha_keystream(self, out_data, (unsigned long)out_len);
if (rv != CRYPT_OK) {
SvREFCNT_dec(RETVAL);
croak("FATAL: chacha_keystream failed: %s", error_to_string(rv));
}
}
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}
OUTPUT:
RETVAL
SV *
crypt(Crypt::Stream::ChaCha 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);
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if (in_data_len == 0) {
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RETVAL = newSVpvn("", 0);
}
else {
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RETVAL = NEWSV(0, in_data_len); /* avoid zero! */
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SvPOK_only(RETVAL);
SvCUR_set(RETVAL, in_data_len);
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out_data = (unsigned char *)SvPVX(RETVAL);
rv = chacha_crypt(self, in_data, (unsigned long)in_data_len, out_data);
if (rv != CRYPT_OK) {
SvREFCNT_dec(RETVAL);
croak("FATAL: chacha_crypt failed: %s", error_to_string(rv));
}
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}
}
OUTPUT:
RETVAL