0xED is an easy to use OS X hex editing application that enables you to modify your files fast and easy. 0xED's custom architecture is based on the Cocoa framework and offers a small memory footprint. 0xED intuitive interface is available in various languages, like English, Italian, French, German, and Simplified Chinese. 0xED Made to Function. Bug Check 0xED: UNMOUNTABLEBOOTVOLUME.; 2 minutes to read; D; In this article. The UNMOUNTABLEBOOTVOLUME bug check has a value of 0x000000ED. This indicates that the I/O subsystem attempted to mount the boot volume and it failed.
To use perfect forward secrecy cipher suites, you must set up Diffie-Hellman parameters (on the server side), or the PFS cipher suites will be silently ignored.
Connect and share knowledge within a single location that is structured and easy to search. Oct 14, 2018 0xED is a native OS X hex editor based on the Cocoa framework.
Diffie-Hellman[edit]
SSL_CTX_set_tmp_dh is used to set the Diffie-Hellman parameters for a context. One of the easiest ways to get Diffie-Hellman parameters to use with this function is to generate random Diffie-Hellman parameters with the dhparam command-line program with the -C option, and embed the resulting code fragment in your program. For example, openssl dhparam -C 2236 might result in:
which can then be used like this:
Be sure to choose a bit length appropriate to the security level you want to achieve, although keep in mind that Diffie-Hellman parameters longer than 2236 bits may be incompatible with older versions of NSS. Even worse, it appears that versions of Java prior to 1.7 don't support Diffie-Hellman parameters longer than 1024 bits!
Validating Parameters[edit]
The Diffie-Hellman parameters should be validated after loading. To perform paramter validation, you call DH_check. DH_check returns 0 or a bitmask values of the following:
- DH_CHECK_P_NOT_PRIME (0x01)
- DH_CHECK_P_NOT_SAFE_PRIME (0x02)
- DH_UNABLE_TO_CHECK_GENERATOR (0x04)
- DH_NOT_SUITABLE_GENERATOR (0x08)
The validation code might look as follows (error checking omitted for clarity):
The additional call to BN_mod_word(dh->p, 24) (and unmasking of DH_NOT_SUITABLE_GENERATOR) is performed to ensure your program accepts IETF group parameters. OpenSSL checks the prime is congruent to 11 when g = 2; while the IETF's primes are congruent to 23 when g = 2. Without the test, the IETF parameters would fail validation. For details, see Diffie-Hellman Parameter Check (when g = 2, must p mod 24 11?).
Elliptic curve Diffie-Hellman[edit]
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For elliptic curve Diffie-Hellman, you can do something like this:
Or, in OpenSSL 1.0.2 (not yet released, as of Feb 2013) and higher, you should be able to do:
For more information, see Elliptic Curve Diffie Hellman and Elliptic Curve Cryptography.
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RFC 3526 PEM Encoded Groups[edit]
Below are three Diffie-Hellman MODP groups specified in RFC 3526, More Modular Exponential (MODP) Diffie-Hellman groups for Internet Key Exchange (IKE) (the 1024-bit parameter is from RFC 2409). They can be used with PEM_read_bio_DHparams and a memory BIO. RFC 3526 also offers 1536-bit, 6144-bit and 8192-bit primes.
Unmountable Boot Volume 0xed