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nostrdb: random: add getrandom fallback for android

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Signed-off-by: William Casarin <jb55@jb55.com>
This commit is contained in:
William Casarin
2024-02-09 18:59:30 -08:00
committed by Daniel D’Aquino
parent 2d5f86b142
commit 1c1e5fa2a0
1 changed files with 30 additions and 4 deletions
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34
nostrdb/src/random.h
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@@ -20,10 +20,16 @@
#include <windows.h>
#include <ntstatus.h>
#include <bcrypt.h>
#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__)
#elif defined(__ANDROID__)
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#elif defined(__linux__) || defined(__FreeBSD__)
#include <sys/random.h>
#elif defined(__OpenBSD__)
#include <unistd.h>
#elif defined(__APPLE__)
#include <Security/SecRandom.h>
#else
#error "Couldn't identify the OS"
#endif
@@ -42,7 +48,27 @@ static int fill_random(unsigned char* data, size_t size) {
} else {
return 1;
}
#elif defined(__linux__) || defined(__FreeBSD__)
#elif defined(__ANDROID__)
int fd = open("/dev/urandom", O_RDONLY);
if (fd < 0) {
return 0; // Failed to open /dev/urandom
}
ssize_t read_bytes = 0;
while (size > 0) {
read_bytes = read(fd, data, size);
if (read_bytes <= 0) {
if (errno == EINTR) {
continue; // If interrupted by signal, try again
}
close(fd);
return 0; // Failed to read
}
data += read_bytes;
size -= read_bytes;
}
close(fd);
return 1;
#elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
/* If `getrandom(2)` is not available you should fallback to /dev/urandom */
ssize_t res = getrandom(data, size, 0);
if (res < 0 || (size_t)res != size ) {
@@ -50,10 +76,10 @@ static int fill_random(unsigned char* data, size_t size) {
} else {
return 1;
}
#elif defined(__APPLE__) || defined(__OpenBSD__)
#elif defined(__APPLE__)
/* If `getentropy(2)` is not available you should fallback to either
* `SecRandomCopyBytes` or /dev/urandom */
int res = getentropy(data, size);
int res = SecRandomCopyBytes(kSecRandomDefault, size, data);
if (res == 0) {
return 1;
} else {