#include <openssl/dh.h> DH *d2i_DHparams(DH **a, const unsigned char **pp, long length); int i2d_DHparams(DH *a, unsigned char **pp);
Otherwise these behave in a similar way to d2i_X509() and i2d_X509() described in the d2i_X509(3) manual page.
i2d_DHparams() returns the length of encoded data on success or a value which is less than or equal to 0 on error.
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