crypto/rand: restore the generic DRBG implementation

The DRGB concept described in NIST SP 800-90A provides for having different
algorithms to generate random output. In fact, the FIPS o

crypto/rand: restore the generic DRBG implementation

The DRGB concept described in NIST SP 800-90A provides for having different
algorithms to generate random output. In fact, the FIPS object module used to
implement three of them, CTR DRBG, HASH DRBG and HMAC DRBG.

When the FIPS code was ported to master in #4019, two of the three algorithms
were dropped, and together with those the entire code that made RAND_DRBG
generic was removed, since only one concrete implementation was left.

This commit restores the original generic implementation of the DRBG, making it
possible again to add additional implementations using different algorithms
(like RAND_DRBG_CHACHA20) in the future.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4998)

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Fix reseeding issues of the public RAND_DRBG

Reseeding is handled very differently by the classic RAND_METHOD API
and the new RAND_DRBG api. These differences led to some problems when

Fix reseeding issues of the public RAND_DRBG

Reseeding is handled very differently by the classic RAND_METHOD API
and the new RAND_DRBG api. These differences led to some problems when
the new RAND_DRBG was made the default OpenSSL RNG. In particular,
RAND_add() did not work as expected anymore. These issues are discussed
on the thread '[openssl-dev] Plea for a new public OpenSSL RNG API'
and in Pull Request #4328. This commit fixes the mentioned issues,
introducing the following changes:

- Replace the fixed size RAND_BYTES_BUFFER by a new RAND_POOL API which
facilitates collecting entropy by the get_entropy() callback.
- Don't use RAND_poll()/RAND_add() for collecting entropy from the
get_entropy() callback anymore. Instead, replace RAND_poll() by
RAND_POOL_acquire_entropy().
- Add a new function rand_drbg_restart() which tries to get the DRBG
in an instantiated state by all means, regardless of the current
state (uninstantiated, error, ...) the DRBG is in. If the caller
provides entropy or additional input, it will be used for reseeding.
- Restore the original documented behaviour of RAND_add() and RAND_poll()
(namely to reseed the DRBG immediately) by a new implementation based
on rand_drbg_restart().
- Add automatic error recovery from temporary failures of the entropy
source to RAND_DRBG_generate() using the rand_drbg_restart() function.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/4328)

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Add DRBG random method

Ported from the last FIPS release, with DUAL_EC and SHA1 and the
self-tests removed. Since only AES-CTR is supported, other code
simplifications were done. R

Add DRBG random method

Ported from the last FIPS release, with DUAL_EC and SHA1 and the
self-tests removed. Since only AES-CTR is supported, other code
simplifications were done. Removed the "entropy blocklen" concept.

Moved internal functions to new include/internal/rand.h.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/3789)

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Cleanup RAND_load_file,RAND_write_file

Document an internal assumption that these are only for use with files,
and return an error if not. That made the code much simpler.
Leave it a

Cleanup RAND_load_file,RAND_write_file

Document an internal assumption that these are only for use with files,
and return an error if not. That made the code much simpler.
Leave it as writing 1024 bytes, even though we don't need more than 256
from a security perspective. But the amount isn't specified, now, so we
can change it later if we want.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3864)

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Add RAND_UNIMPLEMENTED error code

See old GitHub PR 38.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3714)

make error tables const and separate header file

Run perltidy on util/mkerr
Change some mkerr flags, write some doc comments
Make generated tables "const" when genearting lib-interna

make error tables const and separate header file

Run perltidy on util/mkerr
Change some mkerr flags, write some doc comments
Make generated tables "const" when genearting lib-internal ones.
Add "state" file for mkerr
Renerate error tables and headers
Rationalize declaration of ERR_load_XXX_strings
Fix out-of-tree build
Add -static; sort flags/vars for options.
Also tweak code output
Moved engines/afalg to engines (from master)
Use -static flag
Standard engine #include's of errors
Don't linewrap err string tables unless necessary

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3392)

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Check for errors allocating the error strings.

Reviewed-by: Richard Levitte <levitte@openssl.org>
GH: #1330

Remove unused error/function codes.

Add script to find unused err/reason codes
Remove unused reason codes.
Remove entries for unused functions

Reviewed-by: Matt Caswell <mat

Remove unused error/function codes.

Add script to find unused err/reason codes
Remove unused reason codes.
Remove entries for unused functions

Reviewed-by: Matt Caswell <matt@openssl.org>

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Manual fixes after copyright consolidation

Reviewed-by: Richard Levitte <levitte@openssl.org>

Remove /* foo.c */ comments

This was done by the following
find . -name '*.[ch]' | /tmp/pl
where /tmp/pl is the following three-line script:
print unless $. == 1

Remove /* foo.c */ comments

This was done by the following
find . -name '*.[ch]' | /tmp/pl
where /tmp/pl is the following three-line script:
print unless $. == 1 && m@/\* .*\.[ch] \*/@;
close ARGV if eof; # Close file to reset $.

And then some hand-editing of other files.

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>

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Replace "SSLeay" in API with OpenSSL

All instances of SSLeay (any combination of case) were replaced with
the case-equivalent OpenSSL.

Reviewed-by: Richard Levitte <levitte@open

Replace "SSLeay" in API with OpenSSL

All instances of SSLeay (any combination of case) were replaced with
the case-equivalent OpenSSL.

Reviewed-by: Richard Levitte <levitte@openssl.org>

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Run util/openssl-format-source -v -c .

Reviewed-by: Tim Hudson <tjh@openssl.org>

Extensive reorganisation of PRNG handling in FIPS module: all calls
now use an internal RAND_METHOD. All dependencies to OpenSSL standard
PRNG are now removed: it is the applications resposib

Extensive reorganisation of PRNG handling in FIPS module: all calls
now use an internal RAND_METHOD. All dependencies to OpenSSL standard
PRNG are now removed: it is the applications resposibility to setup
the FIPS PRNG and initalise it.

Initial OpenSSL RAND_init_fips() function that will setup the DRBG
for the "FIPS capable OpenSSL".

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add new RAND errors

Update from 0.9.8 stable. Eliminate duplicate error codes.

Rebuild error codes.

In RSA, DSA, DH, and RAND - if the "***_new()" function fails because the
ENGINE code does not return a default, set an error.

Make all configuration macros available for application by making
sure they are available in opensslconf.h, by giving them names starting
with "OPENSSL_" to avoid conflicts with other package

Make all configuration macros available for application by making
sure they are available in opensslconf.h, by giving them names starting
with "OPENSSL_" to avoid conflicts with other packages and by making
sure e_os2.h will cover all platform-specific cases together with
opensslconf.h.

I've checked fairly well that nothing breaks with this (apart from
external software that will adapt if they have used something like
NO_KRB5), but I can't guarantee it completely, so a review of this
change would be a good thing.

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Preserve reason strings in automatically build tables.

There is no reason to use downcase letters throughout in error reason
strings, it's just the default because it's usually ok.

Finish off the X509_ATTRIBUTE string stuff.

Precautions against using the PRNG uninitialized: RAND_bytes() now
returns int (1 = ok, 0 = not seeded). New function RAND_add() is the
same as RAND_seed() but takes an estimate of the entrop

Precautions against using the PRNG uninitialized: RAND_bytes() now
returns int (1 = ok, 0 = not seeded). New function RAND_add() is the
same as RAND_seed() but takes an estimate of the entropy as an additional
argument.

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