.pem file support

[tomato42]

add ability to load primes from .pem files with DH parameters and verifying that they are safe primes

[szepeviktor]

@tomato42 Is this issue about verifying these primes?
Thank you.

$ openssl dhparam -in dh.pem -check -text
    DH Parameters: (3072 bit)
    P:
        00:cc:ca:11:bb:5f:c9:d4:7d:24:bf:48:be:cd:87:
        e0:38:74:20:40:f7:6f:41:ae:c0:f1:87:9f:ac:1f:
        33:9c:e5:cd:e1:73:43:8b:f0:b4:b4:41:65:d8:9d:
        ba:28:7f:ce:5b:c1:97:09:c8:40:5f:e9:d2:d8:b3:
        e7:26:72:34:33:6f:8c:39:64:a0:dc:7c:86:1d:56:
        68:8e:df:b4:1c:f2:d1:26:e4:8e:2e:5e:f3:a8:57:
        34:50:d8:22:a9:58:8d:45:cc:ca:5c:62:ee:59:3d:
        02:8f:ce:0b:37:4d:72:f1:74:30:c7:5b:0a:09:ec:
        04:d6:33:e9:7a:07:93:40:dc:8f:7a:ec:a6:43:68:
        ed:ab:04:c4:b9:c6:5d:41:0a:5a:ec:96:7c:35:57:
        23:8c:93:92:a3:d4:f2:f3:41:d3:8d:09:4e:ba:0f:
        fa:29:27:b3:81:36:1d:67:61:73:34:d2:54:34:74:
        fd:27:e6:d3:17:9a:f4:2b:63:e5:0c:b2:19:fb:d5:
        35:9a:4a:ab:e0:9b:ef:4c:96:7b:a5:e1:59:e7:25:
        b6:0a:7f:7d:15:20:7f:b7:29:c5:f8:61:b5:85:af:
        85:43:28:d0:92:9e:0f:0d:3a:4d:2a:a4:d0:91:eb:
        14:2c:4c:8c:a2:d8:f9:d2:f2:e9:0e:f6:6e:3c:c3:
        01:ee:cc:9c:c2:a5:90:35:fb:63:a4:4d:2f:1c:4d:
        49:0c:53:50:f1:79:aa:3f:8a:e7:e3:5d:78:cd:a2:
        4a:ca:18:d0:6f:25:fd:2a:b5:94:c9:7b:14:69:21:
        39:68:45:19:e0:c2:d1:c6:ac:6e:cc:68:7c:c1:44:
        b3:7f:09:2f:17:49:1a:a6:8c:79:6e:a1:63:a1:88:
        ba:d6:5d:ad:76:b3:e9:42:58:81:c7:33:a5:a1:39:
        ef:2f:11:66:de:b3:4b:a4:ce:47:20:44:9e:c5:91:
        e9:13:fa:55:15:e2:d0:42:64:a8:ed:8e:7e:42:6a:
        0c:32:0a:f4:50:8e:b8:ec:e7:d7
    G:    2 (0x2)
DH parameters appear to be ok.

[tomato42]

yes, it's about having the ability to pass that dh.pem file to the verifier and it figuring out if it has the primality certificate for that P