If an ASN1_INTEGER structure is allocated but not explicitly set encode
it as zero: don't generate an invalid zero length INTEGER.
(cherry picked from commit 1643edc63c3e15b6db5a15a728bc288f2cc2bbc7)

(cherry picked from commit 1546fb780bc11556a18d70c5fb29af4a9d5beaff)

Add DTLS record header parsing, different client hello format and add
HelloVerifyRequest message type.

Add code to d1_pkt.c to send message headers to the message callback.

Add code to support GCM an CCM modes in evp_test. On encrypt this
will compare the expected ciphertext and tag. On decrypt it will
compare the expected plaintext: tag comparison is done internally.

Add a simple CCM test case and convert all tests from crypto/modes/gcm128.c

Thanks to Shay Gueron & Vlad Krasnov for report.

Simple example of CCM code use: translated from the FIPS self tests.

Conflicts:
	util/mk1mf.pl

Make assembly language handling conditional on the "copy" platform
as Windows does its own thing here.

PR: 3005

PR: 3004

Add CMS_RecipientInfo_encrypt: this function encrypts an existing content
encryption key to match the key in the RecipientInfo structure: this is
useful if a new recpient is added to and existing enveloped data structure.

Add documentation.