Commit graph

229 commits

Author SHA1 Message Date
Dmitry Belyavskiy
d95fb70b0e Providing missing accessor to EVP_PKEY.engine
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8526)
2019-03-21 09:06:12 +00:00
Viktor Dukhovni
25eb9299ce More configurable crypto and ssl library initialization
1.  In addition to overriding the default application name,
    one can now also override the configuration file name
    and flags passed to CONF_modules_load_file().

2.  By default we still keep going when configuration file
    processing fails.  But, applications that want to be
    strict about initialization errors can now make explicit
    flag choices via non-null OPENSSL_INIT_SETTINGS that omit
    the CONF_MFLAGS_IGNORE_RETURN_CODES flag (which had so far
    been both undocumented and unused).

3.  In OPENSSL_init_ssl() do not request OPENSSL_INIT_LOAD_CONFIG
    if the options already include OPENSSL_INIT_NO_LOAD_CONFIG.

4.  Don't set up atexit() handlers when called with opts equal to
    OPENSSL_INIT_BASE_ONLY (this flag should only be used alone).

Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7969)
2019-01-07 13:53:52 -05:00
Richard Levitte
6babfb2161 Small cleanup (util/mkdef.pl, crypto/bio/bss_log.c, include/openssl/ocsp.h)
BIO_s_log() is declared for everyone, so should return NULL when not
actually implemented.  Also, it had explicit platform limitations in
util/mkdef.pl that didn't correspond to what was actually in code.
While at it, a few other hard coded things that have lost their
relevance were removed.

include/openssl/ocsp.h had a few duplicate declarations.

Reviewed-by: Paul Yang <yang.yang@baishancloud.com>
(Merged from https://github.com/openssl/openssl/pull/7331)

(cherry picked from commit 7e09c5eaa5)
2018-10-04 09:59:00 +02:00
Paul Yang
0a8fdef752 Support pmeth->digest_custom
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7113)
2018-09-07 18:12:26 +08:00
Paul Yang
00902d9414 Introduce EVP_MD_CTX_set_pkey_ctx
Thus users can use this function to set customized EVP_PKEY_CTX to
EVP_MD_CTX structure.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7113)
2018-09-07 18:12:26 +08:00
Paul Kehrer
20c3672174 add getter for tbsResponseData and signatureAlgorithm on OCSP_BASICRESP
fixes #7081

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/7082)
2018-09-03 06:07:22 +02:00
Andy Polyakov
d2b863643d crypto/threads_*: remove CRYPTO_atomic_{read|write}.
CRYPTO_atomic_read was added with intention to read statistics counters,
but readings are effectively indistinguishable from regular load (even
in non-lock-free case). This is because you can get out-dated value in
both cases. CRYPTO_atomic_write was added for symmetry and was never used.

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/6883)
2018-08-17 12:40:39 +02:00
Matt Caswell
50db81633e Deprecate the EC curve type specific functions in 1.2.0
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6815)
2018-07-31 09:08:50 +01:00
Matt Caswell
8e3cced75f Provide EC functions that are not curve type specific
Some EC functions exist in *_GFp and *_GF2m forms, in spite of the
implementations between the two curve types being identical. This
commit provides equivalent generic functions with the *_GFp and *_GF2m
forms just calling the generic functions.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6815)
2018-07-31 09:08:38 +01:00
Pauli
c7504aeb64 Modify the DEVRANDOM source so that the files are kept open persistently.
This allows operation inside a chroot environment without having the
random device present.

A new call, RAND_keep_random_devices_open(), has been introduced that can
be used to control file descriptor use by the random seed sources. Some
seed sources maintain open file descriptors by default, which allows
such sources to operate in a chroot(2) jail without the associated device
nodes being available.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/6432)
2018-06-27 07:15:36 +10:00
Nicola Tuveri
4f1b96f9fc Use DEPRECATEDIN_1_2_0 macro for DSA_sign_setup declaration
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6467)
2018-06-21 11:01:32 +01:00
Jack Lloyd
2f2e6b6278 Add EVP_PKEY_set_alias_type
Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6443)
2018-06-19 11:29:44 +01:00
Matt Caswell
72ff0a5400 Add function for setting the EVP_PKEY_ASN1_METHOD raw key getter functions
EVP_PKEY_asn1_set_get_priv_key() and EVP_PKEY_asn1_set_get_pub_key()

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6394)
2018-06-08 10:04:09 +01:00
Matt Caswell
0d124b0a51 Add support getting raw private/public keys
Only applies to algorithms that support it. Both raw private and public
keys can be obtained for X25519, Ed25519, X448, Ed448. Raw private keys
only can be obtained for HMAC, Poly1305 and SipHash

Fixes #6259

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6394)
2018-06-08 10:04:09 +01:00
Matt Caswell
206521a06e Remove non-existant functions from libcrypto.num
These were never made public so can just be deleted.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6386)
2018-06-04 11:59:56 +01:00
Mingtao Yang
0124f32a01 Add APIs for custom X509_LOOKUP_METHOD creation
OpenSSL 1.1.0 made the X509_LOOKUP_METHOD structure opaque, so
applications that were previously able to define a custom lookup method
are not able to be ported.

This commit adds getters and setters for each of the current fields of
X509_LOOKUP_METHOD, along with getters and setters on several associated
opaque types (such as X509_LOOKUP and X509_OBJECT).

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6152)
2018-05-30 15:45:48 +02:00
Dr. Matthias St. Pierre
0396401d1c ECDSA_SIG: add simple getters for commonly used struct members
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6290)
2018-05-28 19:11:23 +02:00
Dr. Matthias St. Pierre
6692ff7777 RSA: add simple getters for commonly used struct members
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6290)
2018-05-28 19:11:23 +02:00
Dr. Matthias St. Pierre
e6f35b5768 DSA: add simple getters for commonly used struct members
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6290)
2018-05-28 19:11:23 +02:00
Dr. Matthias St. Pierre
5777254b7a DH: fix: add simple getters for commonly used struct members
amends 6db7fadf09

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6290)
2018-05-28 19:11:22 +02:00
Dr. Matthias St. Pierre
e37d4a6704 util/libcrypto.num: fix symbol collision between 1.1.0 and master
In commit 6decf9436f, fourteen public symbols were removed from
util/libcrypto.num on the master branch and the following symbols
renumbered. Unfortunately, the symbols `OCSP_resp_get0_signer` and
`X509_get0_authority_key_id` were not adjusted accordingly on the
OpenSSL_1_1_0-stable branch. This commit fixes the collision by
doing a 'double swap'.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6278)
2018-05-27 09:50:03 +02:00
Dr. Matthias St. Pierre
6db7fadf09 DH: add simple getters for commonly used DH struct members
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6273)
2018-05-18 08:53:48 +02:00
Matt Caswell
5b748dea5d Add getter for X509_VERIFY_PARAM_get_hostflags
Fixes #5061

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6139)
2018-05-01 15:06:16 +01:00
Matt Caswell
d8f031e890 Move the loading of the ssl_conf module to libcrypto
The GOST engine needs to be loaded before we initialise libssl. Otherwise
the GOST ciphersuites are not enabled. However the SSL conf module must
be loaded before we initialise libcrypto. Otherwise we will fail to read
the SSL config from a config file properly.

Another problem is that an application may make use of both libcrypto and
libssl. If it performs libcrypto stuff first and OPENSSL_init_crypto()
is called and loads a config file it will fail if that config file has
any libssl stuff in it.

This commit separates out the loading of the SSL conf module from the
interpretation of its contents. The loading piece doesn't know anything
about SSL so this can be moved to libcrypto. The interpretation of what it
means remains in libssl. This means we can load the SSL conf data before
libssl is there and interpret it when it later becomes available.

Fixes #5809

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5818)
2018-04-05 15:30:12 +01:00
Matt Caswell
1bf2cc237e Fix no-sm2
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5673)
2018-03-19 17:12:19 +00:00
Jack Lloyd
4e66475063 Handle evp_tests assumption of EVP_PKEY_FLAG_AUTOARGLEN
Without actually using EVP_PKEY_FLAG_AUTOARGLEN

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4793)
2018-03-19 14:33:25 +01:00
Jack Lloyd
3d328a445c Add SM2 signature and ECIES schemes
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4793)
2018-03-19 14:33:25 +01:00
Dr. Matthias St. Pierre
31393fd906 RAND_DRBG: add a function for setting the default DRBG type and flags
This commit adds a new api RAND_DRBG_set_defaults() which sets the
default type and flags for new DRBG instances. See also #5576.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5632)
2018-03-16 18:31:30 +01:00
Dr. Matthias St. Pierre
6decf9436f Publish the RAND_DRBG API
Fixes #4403

This commit moves the internal header file "internal/rand.h" to
<openssl/rand_drbg.h>, making the RAND_DRBG API public.
The RAND_POOL API remains private, its function prototypes were
moved to "internal/rand_int.h" and converted to lowercase.

Documentation for the new API is work in progress on GitHub #5461.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5462)
2018-03-15 18:58:38 +01:00
Matt Caswell
f929439f61 Rename EVP_PKEY_new_private_key()/EVP_PKEY_new_public_key()
Renamed to EVP_PKEY_new_raw_private_key()/EVP_new_raw_public_key() as per
feedback.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5520)
2018-03-15 12:47:27 +00:00
Matt Caswell
e8f9f08f17 Add functions for setting the new EVP_PKEY_ASN1_METHOD functions
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5520)
2018-03-15 12:47:27 +00:00
Matt Caswell
b3831fbb0b Add the function EVP_PKEY_new_CMAC_key()
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5520)
2018-03-15 12:47:27 +00:00
Matt Caswell
a08802ce29 Add functions to create an EVP_PKEY from raw private/public key data
Not all algorithms will support this, since their keys are not a simple
block of data. But many can.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5520)
2018-03-15 12:47:27 +00:00
Dr. Matthias St. Pierre
4917e91160 RAND_DRBG: add a function for setting the reseeding defaults
The introduction of thread local public and private DRBG instances (#5547)
makes it very cumbersome to change the reseeding (time) intervals for
those instances. This commit provides a function to set the default
values for all subsequently created DRBG instances.

 int RAND_DRBG_set_reseed_defaults(
                                   unsigned int master_reseed_interval,
                                   unsigned int slave_reseed_interval,
                                   time_t master_reseed_time_interval,
                                   time_t slave_reseed_time_interval
                                   );

The function is intended only to be used during application initialization,
before any threads are created and before any random bytes are generated.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5576)
2018-03-10 00:26:30 +01:00
Richard Levitte
fac8673b8a STORE: Add the possibility to search for specific information
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2688)
2018-02-23 07:40:42 +01:00
Richard Levitte
072bfcc90b STORE: Add the possibility to specify an expected info type
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2688)
2018-02-23 07:40:42 +01:00
John Hughes
ebc0168384 Add BIO_bind function to bind local address for a socket.
Add -bind option to s_client application to allow specification of
local address for connection.

Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5272)
2018-02-19 22:58:37 +01:00
Massimiliano Pala
b383aa2081 Add X509_get0_authority_key_id() function
This function makes it easier to retrieve a reference to the
  authority key identifier (akid->keyid) inside a certificate.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5271)
2018-02-19 15:47:02 -05:00
Dr. Matthias St. Pierre
812b153706 DRBG: make locking api truly private
In PR #5295 it was decided that the locking api should remain private
and used only inside libcrypto. However, the locking functions were added
back to `libcrypto.num` by `mkdef.pl`, because the function prototypes
were still listed in `internal/rand.h`. (This header contains functions
which are internal, but shared between libcrypto and libssl.)

This commit moves the prototypes to `rand_lcl.h` and changes the names
to lowercase, following the convention therein. It also corrects an
outdated documenting comment.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5375)
2018-02-15 12:25:01 +01:00
Richard Levitte
4fd39122e5 OSSL_STORE: Add OSSL_STORE_vctrl()
It's a convenient complement to OSSL_STORE_ctrl()

Suggested by Norm Green

Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/5363)
2018-02-14 20:11:06 +01:00
Dr. Matthias St. Pierre
4f9dabbfe3 DRBG: unify initialization and cleanup code
The functions drbg_setup() and drbg_cleanup() used to duplicate a lot of
code from RAND_DRBG_new() and RAND_DRBG_free(). This duplication has been
removed, which simplifies drbg_setup() and makes drbg_cleanup() obsolete.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5294)
2018-02-13 17:32:54 +01:00
Dr. Matthias St. Pierre
3ce1c27b56 DRBG: add locking api
This commit adds three new accessors to the internal DRBG lock

   int RAND_DRBG_lock(RAND_DRBG *drbg)
   int RAND_DRBG_unlock(RAND_DRBG *drbg)
   int RAND_DRBG_enable_locking(RAND_DRBG *drbg)

The three shared DRBGs are intended to be used concurrently, so they
have locking enabled by default. It is the callers responsibility to
guard access to the shared DRBGs by calls to RAND_DRBG_lock() and
RAND_DRBG_unlock().

All other DRBG instances don't have locking enabled by default, because
they are intendended to be used by a single thread. If it is desired,
locking can be enabled by using RAND_DRBG_enable_locking().

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5294)
2018-02-13 17:32:54 +01:00
Nick Mathewson
83739b39e5 Run "make update"
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5150)
2018-02-09 17:49:07 +01:00
Benjamin Kaduk
63ab5ea13b Revert the crypto "global lock" implementation
Conceptually, this is a squashed version of:

    Revert "Address feedback"

    This reverts commit 75551e07bd.

and

    Revert "Add CRYPTO_thread_glock_new"

    This reverts commit ed6b2c7938.

But there were some intervening commits that made neither revert apply
cleanly, so instead do it all as one shot.

The crypto global locks were an attempt to cope with the awkward
POSIX semantics for pthread_atfork(); its documentation (the "RATIONALE"
section) indicates that the expected usage is to have the prefork handler
lock all "global" locks, and the parent and child handlers release those
locks, to ensure that forking happens with a consistent (lock) state.
However, the set of functions available in the child process is limited
to async-signal-safe functions, and pthread_mutex_unlock() is not on
the list of async-signal-safe functions!  The only synchronization
primitives that are async-signal-safe are the semaphore primitives,
which are not really appropriate for general-purpose usage.

However, the state consistency problem that the global locks were
attempting to solve is not actually a serious problem, particularly for
OpenSSL.  That is, we can consider four cases of forking application
that might use OpenSSL:

(1) Single-threaded, does not call into OpenSSL in the child (e.g.,
the child calls exec() immediately)

For this class of process, no locking is needed at all, since there is
only ever a single thread of execution and the only reentrancy is due to
signal handlers (which are themselves limited to async-signal-safe
operation and should not be doing much work at all).

(2) Single-threaded, calls into OpenSSL after fork()

The application must ensure that it does not fork() with an unexpected
lock held (that is, one that would get unlocked in the parent but
accidentally remain locked in the child and cause deadlock).  Since
OpenSSL does not expose any of its internal locks to the application
and the application is single-threaded, the OpenSSL internal locks
will be unlocked for the fork(), and the state will be consistent.
(OpenSSL will need to reseed its PRNG in the child, but that is
an orthogonal issue.)  If the application makes use of locks from
libcrypto, proper handling for those locks is the responsibility of
the application, as for any other locking primitive that is available
for application programming.

(3) Multi-threaded, does not call into OpenSSL after fork()

As for (1), the OpenSSL state is only relevant in the parent, so
no particular fork()-related handling is needed.  The internal locks
are relevant, but there is no interaction with the child to consider.

(4) Multi-threaded, calls into OpenSSL after fork()

This is the case where the pthread_atfork() hooks to ensure that all
global locks are in a known state across fork() would come into play,
per the above discussion.  However, these "calls into OpenSSL after
fork()" are still subject to the restriction to async-signal-safe
functions.  Since OpenSSL uses all sorts of locking and libc functions
that are not on the list of safe functions (e.g., malloc()), this
case is not currently usable and is unlikely to ever be usable,
independently of the locking situation.  So, there is no need to
go through contortions to attempt to support this case in the one small
area of locking interaction with fork().

In light of the above analysis (thanks @davidben and @achernya), go
back to the simpler implementation that does not need to distinguish
"library-global" locks or to have complicated atfork handling for locks.

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/5089)
2018-01-31 12:25:28 -06:00
Kurt Roeckx
20928ff635 Add RAND_DRBG_bytes
Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/4752)
2018-01-29 12:42:06 +01:00
David Cooper
b4dd21a7b8 Add -rsigopt option to ocsp command
Add a -rsigopt option to the ocsp command that allows signature parameters to be provided for the signing of OCSP responses. The parameters that may be provided to -rsigopt are the same as may be provided to -sigopt in the ca, req, and x509 commands.

This PR also defines a OCSP_basic_sign_ctx() function, which functions in the same way as OCSP_basic_sign(), except that it accepts a EVP_MD_CTX rather than a key and digest. The OCSP_basic_sign_ctx() function is used to implement the -rsigopt option in the ocsp command.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4190)
2018-01-24 18:30:31 +00:00
Pauli
4bed94f0c1 SHA512/224 and SHA512/256
Support added for these two digests, available only via the EVP interface.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5093)
2018-01-24 07:09:46 +10:00
Rich Salz
fa7435820e Add accessors for AdmissionSyntax
Based on code from Matthias Ballreich, Steve Henson, and Wolf Tobias.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4724)
2018-01-22 11:29:52 -05:00
Dr. Matthias St. Pierre
08a65d9686 Implement automatic reseeding of DRBG after a specified time interval
Every DRBG now supports automatic reseeding not only after a given
number of generate requests, but also after a specified time interval.

Signed-off-by: Dr. Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/4402)
2017-12-17 23:12:10 +01:00
Dr. Matthias St. Pierre
a93ba405b0 Add master DRBG for reseeding
A third shared DRBG is added, the so called master DRBG. Its sole purpose
is to reseed the two other shared DRBGs, the public and the private DRBG.
The randomness for the master DRBG is either pulled from the os entropy
sources, or added by the application using the RAND_add() call.

The master DRBG reseeds itself automatically after a given number of generate
requests, but can also be reseeded using RAND_seed() or RAND_add().
A reseeding of the master DRBG is automatically propagated to the public
and private DRBG. This construction fixes the problem, that up to now
the randomness provided by RAND_add() was added only to the public and
not to the private DRBG.

Signed-off-by: Dr. Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/4402)
2017-12-17 23:12:10 +01:00