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kex.c: group16-sha512 and group18-sha512 support #457 (#468)

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Files: kex.c

Notes:
Added key exchange group16-sha512 and group18-sha512. As a result did the following:

Abstracted diffie_hellman_sha256() to diffie_hellman_sha_algo() which is now algorithm agnostic and takes the algorithm as a parameter since we needed sha512 support. Unfortunately it required some helper functions but they are simple.
Deleted diffie_hellman_sha1()
Deleted diffie_hellman_sha1 specific macro
Cleaned up some formatting
Defined sha384 in os400 and wincng backends
Defined LIBSSH2_DH_MAX_MODULUS_BITS to abort the connection if we receive too large of p from the server doing sha1 key exchange.
Reorder the default key exchange list to match OpenSSH and improve security

Credit:
Will Cosgrove
This commit is contained in:
Will Cosgrove
2020-09-23 13:20:00 -07:00
committed by GitHub
parent 9ae9ff30cb
commit f553dcc95d
5 changed files with 575 additions and 862 deletions
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2
include/libssh2.h
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@@ -239,6 +239,8 @@ typedef off_t libssh2_struct_stat_size;
#define LIBSSH2_DH_GEX_OPTGROUP 4096
#define LIBSSH2_DH_GEX_MAXGROUP 8192
#define LIBSSH2_DH_MAX_MODULUS_BITS 16384
/* Defaults for pty requests */
#define LIBSSH2_TERM_WIDTH 80
#define LIBSSH2_TERM_HEIGHT 24