i2d_PUBKEY
int pkey_der_len = i2d_PUBKEY(pkey, &pkey_der);
return PEM_ASN1_write((i2d_of_void *)i2d_PUBKEY, PEM_STRING_PUBLIC, fp,
return PEM_ASN1_write_bio((i2d_of_void *)i2d_PUBKEY, PEM_STRING_PUBLIC, bp,
int i2d_PUBKEY(EVP_PKEY *a,unsigned char **pp);