ngx_ssl_dhparam and dh1024_p

Igor Sysoev igor at
Mon Dec 9 14:53:17 UTC 2013

On Dec 9, 2013, at 5:54 , Jeffrey Walton wrote:

> Hi All,
> ngx_event_openssl.c hs the following around line 535:
> ngx_ssl_dhparam(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file)
> {
>   ...
>    /*
>     * -----BEGIN DH PARAMETERS-----
>     * MIGHAoGBALu8LcrYRnSQfEP89YDpz9vZWKP1aLQtSwju1OsPs1BMbAMCducQgAxc
>     * y7qokiYUxb7spWWl/fHSh6K8BJvmd4Bg6RqSp1fjBI9osHb302zI8pul34HcLKcl
>     * 7OZicMyaUDXYzs7vnqAnSmOrHlj6/UmI0PZdFGdX2gcd8EXP4WubAgEC
>     * -----END DH PARAMETERS-----
>     */
>    static unsigned char dh1024_p[] = {
>        0xBB, 0xBC, 0x2D, 0xCA, 0xD8, 0x46, 0x74, 0x90, 0x7C, 0x43, 0xFC, 0xF5,
>        0x80, 0xE9, 0xCF, 0xDB, 0xD9, 0x58, 0xA3, 0xF5, 0x68, 0xB4, 0x2D, 0x4B,
>        0x08, 0xEE, 0xD4, 0xEB, 0x0F, 0xB3, 0x50, 0x4C, 0x6C, 0x03, 0x02, 0x76,
>        0xE7, 0x10, 0x80, 0x0C, 0x5C, 0xCB, 0xBA, 0xA8, 0x92, 0x26, 0x14, 0xC5,
>        0xBE, 0xEC, 0xA5, 0x65, 0xA5, 0xFD, 0xF1, 0xD2, 0x87, 0xA2, 0xBC, 0x04,
>        0x9B, 0xE6, 0x77, 0x80, 0x60, 0xE9, 0x1A, 0x92, 0xA7, 0x57, 0xE3, 0x04,
>        0x8F, 0x68, 0xB0, 0x76, 0xF7, 0xD3, 0x6C, 0xC8, 0xF2, 0x9B, 0xA5, 0xDF,
>        0x81, 0xDC, 0x2C, 0xA7, 0x25, 0xEC, 0xE6, 0x62, 0x70, 0xCC, 0x9A, 0x50,
>        0x35, 0xD8, 0xCE, 0xCE, 0xEF, 0x9E, 0xA0, 0x27, 0x4A, 0x63, 0xAB, 0x1E,
>        0x58, 0xFA, 0xFD, 0x49, 0x88, 0xD0, 0xF6, 0x5D, 0x14, 0x67, 0x57, 0xDA,
>        0x07, 0x1D, 0xF0, 0x45, 0xCF, 0xE1, 0x6B, 0x9B
>    };
>    ...
> Searching on the web for the strings ("MIGHAoGBALu8Lcr", "0xBB, 0xBC,
> 0x2D, 0xCA, 0xD8, 0x46, 0x74, 0x90" and "bbbc2dcad8467490") returned
> hits for nginx (but no hits in a standard somewhere).
> Would anyone happen to know where that prime and generator came from?
> Does anyone know the subgroup order (or what is the q)? Is q at least
> 160-bits (or 2k, where k is 80-bits for the security level offered in
> the 1024-bit DH prime)?
> Thanks in advance.

This parameters were obtained using "openssl dhparam -C 1024" command.

Igor Sysoev

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