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MODULE = CryptX PACKAGE = Crypt::PRNG
PROTOTYPES: DISABLE
Crypt::PRNG
new(char * class, ...)
CODE:
{
IV curpid = (IV)PerlProc_getpid();
int rv, id, idx;
unsigned char *ent=NULL;
STRLEN ent_len=0;
unsigned char entropy_buf[40];
char *prng_name = (char *)"ChaCha20";
SV *entropy = &PL_sv_undef;
/* we need to handle:
Crypt::PRNG->new('RC4');
Crypt::Cipher::RC4->new();
*/
idx = strcmp("Crypt::PRNG", class) == 0 ? 1 : 0;
if (idx + 1 <= items) prng_name = SvPVX(ST(idx));
if (idx + 2 <= items) entropy = ST(idx + 1);
Newz(0, RETVAL, 1, struct prng_struct);
if (!RETVAL) croak("FATAL: Newz failed");
id = _find_prng(prng_name);
if (id == -1) {
Safefree(RETVAL);
croak("FATAL: find_prng failed for '%s'", prng_name);
}
RETVAL->last_pid = curpid;
RETVAL->desc = &prng_descriptor[id];
rv = RETVAL->desc->start(&RETVAL->state);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: PRNG_start failed: %s", error_to_string(rv));
}
if (SvOK(entropy)) {
ent = (unsigned char *) SvPVbyte(entropy, ent_len);
rv = RETVAL->desc->add_entropy(ent, (unsigned long)ent_len, &RETVAL->state);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: PRNG_add_entropy failed: %s", error_to_string(rv));
}
}
else {
if (rng_get_bytes(entropy_buf, 40, NULL) != 40) {
Safefree(RETVAL);
croak("FATAL: rng_get_bytes failed: %s", error_to_string(rv));
}
rv = RETVAL->desc->add_entropy(entropy_buf, 40, &RETVAL->state);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: PRNG_add_entropy failed: %s", error_to_string(rv));
}
}
rv = RETVAL->desc->ready(&RETVAL->state);
if (rv != CRYPT_OK) {
Safefree(RETVAL);
croak("FATAL: PRNG_ready failed: %s", error_to_string(rv));
}
}
OUTPUT:
RETVAL
void
DESTROY(Crypt::PRNG self)
CODE:
Safefree(self);
void
add_entropy(Crypt::PRNG self, SV * entropy=&PL_sv_undef)
CODE:
{
STRLEN in_len=0;
unsigned char *in_buffer=NULL;
unsigned char entropy_buf[40];
int rv;
if (SvOK(entropy)) {
in_buffer = (unsigned char *) SvPVbyte(entropy, in_len);
rv = self->desc->add_entropy(in_buffer, (unsigned long)in_len, &self->state);
if (rv != CRYPT_OK) croak("FATAL: PRNG_add_entropy failed: %s", error_to_string(rv));
}
else {
if (rng_get_bytes(entropy_buf, 40, NULL) != 40) croak("FATAL: rng_get_bytes failed");
rv = self->desc->add_entropy(entropy_buf, 40, &self->state);
if (rv != CRYPT_OK) croak("FATAL: PRNG_add_entropy failed: %s", error_to_string(rv));
}
rv = self->desc->ready(&self->state);
if (rv != CRYPT_OK) croak("FATAL: PRNG_ready failed: %s", error_to_string(rv));
}
SV *
bytes(Crypt::PRNG self, unsigned long output_len)
ALIAS:
bytes_hex = 1
bytes_b64 = 2
bytes_b64u = 3
CODE:
{
IV curpid = (IV)PerlProc_getpid();
int rv_len, rv;
unsigned long len;
unsigned char *rdata, *tmp;
unsigned char entropy_buf[40];
if (output_len == 0) {
RETVAL = newSVpvn("", 0);
}
else {
if (self->last_pid != curpid) {
if (rng_get_bytes(entropy_buf, 40, NULL) != 40) croak("FATAL: rng_get_bytes failed");
self->desc->add_entropy(entropy_buf, 40, &self->state);
self->desc->ready(&self->state);
self->last_pid = curpid;
}
if (ix == 1) {
/* HEX */
Newz(0, tmp, output_len, unsigned char);
if (tmp == NULL) croak("FATAL: Newz failed");
rv_len = (self->desc->read)(tmp, (unsigned long)output_len, &self->state);
if ((UV)rv_len != output_len) croak("FATAL: PRNG_read failed");
RETVAL = NEWSV(0, output_len * 2 + 1); /* avoid zero! */
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, output_len * 2 + 1);
rdata = (unsigned char *)SvPVX(RETVAL);
len = output_len * 2 + 1;
rv = base16_encode(tmp, output_len, rdata, &len, 0);
SvCUR_set(RETVAL, len);
Safefree(tmp);
if (rv != CRYPT_OK) {
SvREFCNT_dec(RETVAL);
croak("FATAL: base16_encode failed");
}
}
else if (ix == 2 || ix == 3) {
/* BASE64 or BASE64URL */
Newz(0, tmp, output_len, unsigned char);
if (tmp == NULL) croak("FATAL: Newz failed");
rv_len = (self->desc->read)(tmp, (unsigned long)output_len, &self->state);
if ((UV)rv_len != output_len) croak("FATAL: PRNG_read failed");
RETVAL = NEWSV(0, output_len * 2); /* avoid zero! */
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, output_len * 2);
rdata = (unsigned char *)SvPVX(RETVAL);
len = output_len * 2;
rv = ix == 3 ? base64url_encode(tmp, output_len, rdata, &len) :
base64_encode(tmp, output_len, rdata, &len);
SvCUR_set(RETVAL, len);
Safefree(tmp);
if (rv != CRYPT_OK) {
SvREFCNT_dec(RETVAL);
croak(ix == 3 ? "FATAL: base64url_encode failed" : "FATAL: base64_encode failed");
}
}
else {
/* RAW BYTES */
RETVAL = NEWSV(0, output_len); /* avoid zero! */
SvPOK_only(RETVAL);
SvCUR_set(RETVAL, output_len);
rdata = (unsigned char *)SvPVX(RETVAL);
rv_len = (self->desc->read)(rdata, (unsigned long)output_len, &self->state);
if ((UV)rv_len != output_len) {
SvREFCNT_dec(RETVAL);
croak("FATAL: PRNG_read failed");
}
}
}
}
OUTPUT:
RETVAL
UV
int32(Crypt::PRNG self)
CODE:
{
IV curpid = (IV)PerlProc_getpid();
int i;
unsigned char rdata[4];
unsigned char entropy_buf[40];
if (self->last_pid != curpid) {
if (rng_get_bytes(entropy_buf, 40, NULL) != 40) croak("FATAL: rng_get_bytes failed");
self->desc->add_entropy(entropy_buf, 40, &self->state);
self->desc->ready(&self->state);
self->last_pid = curpid;
}
i = (self->desc->read)(rdata, 4, &self->state);
if (i != 4) croak("FATAL: PRNG_read failed");
RETVAL = ((UV)(rdata[0])<<24) + ((UV)(rdata[1])<<16) + ((UV)(rdata[2])<<8) + ((UV)(rdata[3]));
}
OUTPUT:
RETVAL
NV
double(Crypt::PRNG self, SV * limit_sv = NULL)
CODE:
{
IV curpid = (IV)PerlProc_getpid();
int i;
unsigned long a, b; /* 32bit is enough */
unsigned char rdata[7]; /* for double we need 53 bits */
unsigned char entropy_buf[40];
if (self->last_pid != curpid) {
if (rng_get_bytes(entropy_buf, 40, NULL) != 40) croak("FATAL: rng_get_bytes failed");
self->desc->add_entropy(entropy_buf, 40, &self->state);
self->desc->ready(&self->state);
self->last_pid = curpid;
}
i = (self->desc->read)(rdata, 7, &self->state);
if (i != 7) croak("FATAL: PRNG_read failed");
a = (((unsigned long)(rdata[0])<<16) + ((unsigned long)(rdata[1])<<8) + ((unsigned long)(rdata[2]))) & 0x1FFFFF; /* 21 bits */
b = ((unsigned long)(rdata[3])<<24) + ((unsigned long)(rdata[4])<<16) + ((unsigned long)(rdata[5])<<8) + ((unsigned long)(rdata[6])); /* 32 bits */
RETVAL = ( (NV)a * 4294967296.0 + (NV)b ) / 9007199254740992.0; /* (a * 2^32 + b) / 2^53 */
if (limit_sv && SvOK(limit_sv)) {
NV limit = SvNV(limit_sv);
if (limit > 0 || limit < 0) RETVAL = RETVAL * limit;
}
}
OUTPUT:
RETVAL
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