openssl/RAND_bytes

[kakashi316]

Im experimenting with openssl for homework and I need to generate a 1024 bit file. I know you can use RAND Bytes for this,but im not entirely sure how.

As an example,
int RAND_bytes(unsigned char *buf, int num);


would all i need to do is put in 1024 or would more be needed?

[memcpy]

Do you know the difference between a Bit and a Byte?

[kakashi316]

Do you know the difference between a Bit and a Byte?

I'm aware,what I mean is where I need to set any parameters into the rand bytes function,or just leave it alone? Yes,I'm aware I'm slow on the uptake where it comes to programming. But a straightforward answer would be most appreciated.

[laserlight]

What does the documentation say about RAND_bytes?

[ledow]

Seriously, OP, first hit on Google for "RAND_bytes" (I didn't even bother to include OpenSSL in the search terms):

OpenSSL: Documents, RAND_bytes(3)

RAND_bytes(buf, num) "puts num cryptographically strong pseudo-random bytes into buf."

If you want 1024 random BYTES, you'd use RAND_bytes(buf, 1024); with a suitable buffer (which would need to be AT LEAST 1024 bytes long before you started).

I'd consider this a first strike at an obvious question with an even-more-obvious answer that's easily searchable. These sorts of posts just annoy people.

[kakashi316]

Seriously, OP, first hit on Google for "RAND_bytes" (I didn't even bother to include OpenSSL in the search terms):

OpenSSL: Documents, RAND_bytes(3)

RAND_bytes(buf, num) "puts num cryptographically strong pseudo-random bytes into buf."

If you want 1024 random BYTES, you'd use RAND_bytes(buf, 1024); with a suitable buffer (which would need to be AT LEAST 1024 bytes long before you started).

I'd consider this a first strike at an obvious question with an even-more-obvious answer that's easily searchable. These sorts of posts just annoy people.

thanks dude