random_number.c File Reference

Implements OP_RANDOM_NUMBER to generate cryptographically secure random bytes. More...

#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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Functions
	if (lv.type !=VAL_INT)
	if (len< 0)
	if (len==0)
	if (len > MAX_RAW)
	if (!raw||!hex)
	if (!ok)
	for (int64_t i=0;i< len;++i)
	free (raw)
	free (hex)
	free_value (lv)
	push_value (vm, s)

Variables
case	OP_RANDOM_NUMBER
int64_t	len = lv.i
const int64_t	MAX_RAW = (1LL << 20)
unsigned char *	raw = (unsigned char *)malloc((size_t)len)
char *	hex = (char *)malloc((size_t)len * 2 + 1)
int	ok = 0
Value	s = make_string(hex)
	break

Detailed Description

Implements OP_RANDOM_NUMBER to generate cryptographically secure random bytes.

Behavior:

• Pops len (int, number of raw bytes to generate) and pushes a lowercase hex string of length 2*len.
• Uses the platform-preferred CSPRNG (e.g., getrandom/arc4random/BCryptGenRandom); falls back to /dev/urandom on UNIX.
• Caps requested length to prevent excessive allocations.

Errors:

• If len is not an int, or negative, prints an error and pushes an empty string.
• If OS RNG is unavailable or allocation fails, prints an error and terminates the VM (exit(1)).

Definition in file random_number.c.

Function Documentation

for()

for

(

)

Definition at line 138 of file random_number.c.

free() [1/2]

free

(

hex

)

free() [2/2]

free

(

raw

)

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free_value()

free_value

(

lv

)

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if() [1/6]

if

(

!

ok

)

Definition at line 128 of file random_number.c.

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if() [2/6]

if

(

!raw||!

hex

)

Definition at line 81 of file random_number.c.

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if() [3/6]

if	(	len	,
		MAX_RAW	)

Definition at line 72 of file random_number.c.

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if() [4/6]

if

(

)

Definition at line 58 of file random_number.c.

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if() [5/6]

if

(

len

= = 0

)

Definition at line 64 of file random_number.c.

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if() [6/6]

if

(

lv.type !

= VAL_INT

)

Definition at line 50 of file random_number.c.

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push_value()

push_value	(	vm	,
		s	)

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Variable Documentation

break

break

Definition at line 150 of file random_number.c.

hex

hex[len *2] = (char *)malloc((size_t)len * 2 + 1)

Definition at line 80 of file random_number.c.

len

int64_t len = lv.i

Definition at line 57 of file random_number.c.

MAX_RAW

const int64_t MAX_RAW = (1LL << 20)

Definition at line 71 of file random_number.c.

ok

ok = 0

Definition at line 89 of file random_number.c.

OP_RANDOM_NUMBER

case OP_RANDOM_NUMBER

Definition at line 47 of file random_number.c.

raw

unsigned char* raw = (unsigned char *)malloc((size_t)len)

Definition at line 79 of file random_number.c.

s

Value s = make_string(hex)

Definition at line 145 of file random_number.c.