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

# NAME

DSA_dup_DH - create a DH structure out of DSA structure

# SYNOPSIS

     #include <openssl/dsa.h>

     DH * DSA_dup_DH(const DSA *r);

# DESCRIPTION

`DSA_dup_DH()` duplicates DSA parameters/keys as DH parameters/keys. q is lost during that conversion, but the resulting DH parameters contain its length.

# RETURN VALUE

`DSA_dup_DH()` returns the new DH structure, and NULL on error. The error codes can be obtained by ERR_get_error.

# NOTE

Be careful to avoid small subgroup attacks when using this.

# SEE ALSO

dh, dsa, ERR_get_error

# HISTORY

`DSA_dup_DH()` was added in OpenSSL 0.9.4.