- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUE
- SEE ALSO
- HISTORY

# NAME

DH_size - get Diffie-Hellman prime size

# SYNOPSIS

     #include <openssl/dh.h>

     int DH_size(DH *dh);

# DESCRIPTION

This function returns the Diffie-Hellman size in bytes. It can be used to determine how much memory must be allocated for the shared secret computed by `DH_compute_key()`.

dh->p must not be NULL.

# RETURN VALUE

The size in bytes.

# SEE ALSO

dh, DH_generate_key

# HISTORY

`DH_size()` is available in all versions of SSLeay and OpenSSL.