Commit Graph

51 Commits

Author SHA1 Message Date
Matt Caswell da1c088f59 Copyright year updates
Reviewed-by: Richard Levitte <levitte@openssl.org>
Release: yes
2023-09-07 09:59:15 +01:00
Dmitry Belyavskiy c5aa719502 If oaep_md is not initialized, correctly initialize it
Fixes #20993

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20994)
2023-05-23 15:10:09 +02:00
Irak Rigia 1e6bd31e58 Replaced '{ 0, NULL }' with OSSL_DISPATCH_END in OSSL_DISPATCH arrays
Fixes #20710

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20745)
2023-04-21 16:19:11 +02:00
Hubert Kario 5ab3ec1bb1 rsa: Add option to disable implicit rejection
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13817)
2022-12-12 11:30:52 +01:00
James Muir e5a7536eae set MGF1 digest correctly
Fixes #19290

update rsa_set_ctx_params() so that the digest function used in the
MGF1 construction is set correctly.  Add a test for this to
evp_extra_test.c based on the code scaro-axway provided in #19290.

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19342)
2022-10-07 19:53:04 +02:00
Richard Levitte e077455e9e Stop raising ERR_R_MALLOC_FAILURE in most places
Since OPENSSL_malloc() and friends report ERR_R_MALLOC_FAILURE, and
at least handle the file name and line number they are called from,
there's no need to report ERR_R_MALLOC_FAILURE where they are called
directly, or when SSLfatal() and RLAYERfatal() is used, the reason
`ERR_R_MALLOC_FAILURE` is changed to `ERR_R_CRYPTO_LIB`.

There were a number of places where `ERR_R_MALLOC_FAILURE` was reported
even though it was a function from a different sub-system that was
called.  Those places are changed to report ERR_R_{lib}_LIB, where
{lib} is the name of that sub-system.
Some of them are tricky to get right, as we have a lot of functions
that belong in the ASN1 sub-system, and all the `sk_` calls or from
the CRYPTO sub-system.

Some extra adaptation was necessary where there were custom OPENSSL_malloc()
wrappers, and some bugs are fixed alongside these changes.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19301)
2022-10-05 14:02:03 +02:00
Tomas Mraz 926c698c6f sm2_dupctx: Avoid potential use after free of the md
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18494)
2022-06-10 14:06:57 +02:00
Matt Caswell 36cf45ef3b Correctly calculate the length of SM2 plaintext given the ciphertext
Previously the length of the SM2 plaintext could be incorrectly calculated.
The plaintext length was calculated by taking the ciphertext length and
taking off an "overhead" value.

The overhead value was assumed to have a "fixed" element of 10 bytes.
This is incorrect since in some circumstances it can be more than 10 bytes.
Additionally the overhead included the length of two integers C1x and C1y,
which were assumed to be the same length as the field size (32 bytes for
the SM2 curve). However in some cases these integers can have an additional
padding byte when the msb is set, to disambiguate them from negative
integers. Additionally the integers can also be less than 32 bytes in
length in some cases.

If the calculated overhead is incorrect and larger than the actual value
this can result in the calculated plaintext length being too small.
Applications are likely to allocate buffer sizes based on this and therefore
a buffer overrun can occur.

CVE-2021-3711

Issue reported by John Ouyang.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Nicola Tuveri <nic.tuv@gmail.com>
2021-08-24 14:22:07 +01:00
Tomas Mraz 085e3cecbd Move libssl related defines used by fips provider to prov_ssl.h
This nicely reduces the number of files considered as fips
provider sources.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15609)
2021-06-04 17:06:47 +02:00
Tomas Mraz ed576acdf5 Rename all getters to use get/get0 in name
For functions that exist in 1.1.1 provide a simple aliases via #define.

Fixes #15236

Functions with OSSL_DECODER_, OSSL_ENCODER_, OSSL_STORE_LOADER_,
EVP_KEYEXCH_, EVP_KEM_, EVP_ASYM_CIPHER_, EVP_SIGNATURE_,
EVP_KEYMGMT_, EVP_RAND_, EVP_MAC_, EVP_KDF_, EVP_PKEY_,
EVP_MD_, and EVP_CIPHER_ prefixes are renamed.

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15405)
2021-06-01 12:40:00 +02:00
Rich Salz 9d0dd1d513 Use "" for include crypto/xxx
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15468)
2021-05-27 09:56:41 +10:00
Richard Levitte 848af5e8fe Drop libimplementations.a
libimplementations.a was a nice idea, but had a few flaws:

1.  The idea to have common code in libimplementations.a and FIPS
    sensitive helper functions in libfips.a / libnonfips.a didn't
    catch on, and we saw full implementation ending up in them instead
    and not appearing in libimplementations.a at all.

2.  Because more or less ALL algorithm implementations were included
    in libimplementations.a (the idea being that the appropriate
    objects from it would be selected automatically by the linker when
    building the shared libraries), it's very hard to find only the
    implementation source that should go into the FIPS module, with
    the result that the FIPS checksum mechanism include source files
    that it shouldn't

To mitigate, we drop libimplementations.a, but retain the idea of
collecting implementations in static libraries.  With that, we not
have:

libfips.a

    Includes all implementations that should become part of the FIPS
    provider.

liblegacy.a

    Includes all implementations that should become part of the legacy
    provider.

libdefault.a

    Includes all implementations that should become part of the
    default and base providers.

With this, libnonfips.a becomes irrelevant and is dropped.
libcommon.a is retained to include common provider code that can be
used uniformly by all providers.

Fixes #15157

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15171)
2021-05-07 10:17:23 +02:00
Matt Caswell 6ce58488bd Store some FIPS global variables in the FIPS_GLOBAL structure
We had some FIPS global variables that were based on values from the
config file. In theory if two instances of the fips module are loaded
they could be based on different config files which would cause this to
fail. Instead we store them in the FIPS_GLOBAL structure.

Fixes #14364

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14814)
2021-04-16 14:27:28 +01:00
Tomas Mraz 0cfbc828e0 Deprecate the EVP_PKEY controls for CMS and PKCS#7
Improve the ossl_rsa_check_key() to prevent non-signature
operations with PSS keys.

Do not invoke the EVP_PKEY controls for CMS and PKCS#7 anymore
as they are not needed anymore and deprecate them.

Fixes #14276

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/14760)
2021-04-06 09:10:11 +02:00
Pauli bca681aa5b rsa: fix coverity 1472658: resource leak
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14596)
2021-03-20 10:08:00 +10:00
Pauli cbdeb04c90 prov: asym ciphers take an extra init() params argument
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/14383)
2021-03-12 08:27:11 +10:00
Tomas Mraz fb67126ea8 EVP_PKEY_CTX_get/settable_params: pass provider operation context
This allows making the signature operations return different
settable params when the context is initialized with
EVP_DigestSign/VerifyInit.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/14338)
2021-03-03 11:25:39 +01:00
Rich Salz b0aae91324 Remove RSA SSLv23 padding mode
Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14248)
2021-03-01 10:56:12 +01:00
Shane Lontis 32ab57cbb4 Fix external symbols related to ec & sm2 keys
Partial fix for #12964

This adds ossl_ names for the following symbols:

ec_*, ecx_*, ecdh_*, ecdsa_*, sm2_*

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14231)
2021-02-26 10:53:01 +10:00
Tomas Mraz 2741128e9d Move the PROV_R reason codes to a public header
The PROV_R codes can be returned to applications so it is useful
to have some common set of provider reason codes for the applications
or third party providers.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/14086)
2021-02-11 09:34:31 +01:00
Richard Levitte 58f422f6f4 Fix some odd names in our provider source code
ecossl_dh_keyexch_functions     -> ossl_ecdh_keyexch_functions
ecossl_dsa_signature_functions  -> ossl_ecdsa_signature_functions
sm2_asym_cipher_functions       -> ossl_sm2_asym_cipher_functions
sm2_keymgmt_functions           -> ossl_sm2_keymgmt_functions
sm2_signature_functions         -> ossl_sm2_signature_functions

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14028)
2021-02-01 23:02:20 +01:00
Richard Levitte 4333b89f50 Update copyright year
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13999)
2021-01-28 13:54:57 +01:00
Richard Levitte ba0a6d1deb Clean away unnecessary length related OSSL_PARAM key names
This cleans away old misunderstandings of what can be done with OSSL_PARAM.

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13946)
2021-01-26 15:51:50 +01:00
Shane Lontis 5b5eea4b60 Deprecate EC_KEY + Update ec apps to use EVP_PKEY
Co-author: Richard Levitte <levitte@openssl.org>
Co-author: Tomas Mraz <tmraz@openssl.org>

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13139)
2021-01-26 15:22:14 +01:00
Richard Levitte 6debc6ab74 Convert all {NAME}err() in providers/ to their corresponding ERR_raise() call
This was done using util/err-to-raise

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/13319)
2020-11-11 12:15:48 +01:00
Dr. Matthias St. Pierre a829b735b6 Rename some occurrences of 'library_context' and 'lib_ctx' to 'libctx'
This change makes the naming more consistent, because three different terms
were used for the same thing. (The term libctx was used by far most often.)

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12621)
2020-10-15 12:00:21 +01:00
Dr. Matthias St. Pierre b425001010 Rename OPENSSL_CTX prefix to OSSL_LIB_CTX
Many of the new types introduced by OpenSSL 3.0 have an OSSL_ prefix,
e.g., OSSL_CALLBACK, OSSL_PARAM, OSSL_ALGORITHM, OSSL_SERIALIZER.

The OPENSSL_CTX type stands out a little by using a different prefix.
For consistency reasons, this type is renamed to OSSL_LIB_CTX.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12621)
2020-10-15 11:59:53 +01:00
Pauli 23b2fc0b50 rsa: add ossl_ prefix to internal rsa_ calls.
The functions being:
    rsa_check_crt_components, rsa_check_key, rsa_check_pminusq_diff,
    rsa_check_prime_factor, rsa_check_prime_factor_range,
    rsa_check_private_exponent, rsa_check_public_exponent,
    rsa_digestinfo_encoding, rsa_fips186_4_gen_prob_primes, rsa_fromdata,
    rsa_get0_all_params, rsa_get0_libctx, rsa_get0_pss_params_30,
    rsa_get_lcm, rsa_mgf_nid2name, rsa_mp_coeff_names, rsa_mp_exp_names,
    rsa_mp_factor_names, rsa_new_with_ctx, rsa_oaeppss_md2nid,
    rsa_oaeppss_nid2name, rsa_padding_add_PKCS1_OAEP_mgf1_with_libctx,
    rsa_padding_add_PKCS1_type_2_with_libctx,
    rsa_padding_add_SSLv23_with_libctx, rsa_padding_check_PKCS1_type_2_TLS,
    rsa_pkey_method, rsa_pss_params_30_copy, rsa_pss_params_30_fromdata,
    rsa_pss_params_30_hashalg, rsa_pss_params_30_is_unrestricted,
    rsa_pss_params_30_maskgenalg, rsa_pss_params_30_maskgenhashalg,
    rsa_pss_params_30_saltlen, rsa_pss_params_30_set_defaults,
    rsa_pss_params_30_set_hashalg, rsa_pss_params_30_set_maskgenalg,
    rsa_pss_params_30_set_maskgenhashalg, rsa_pss_params_30_set_saltlen,
    rsa_pss_params_30_set_trailerfield, rsa_pss_params_30_todata,
    rsa_pss_params_30_trailerfield, rsa_pss_pkey_method, rsa_set0_all_params,
    rsa_sp800_56b_check_keypair, rsa_sp800_56b_check_private,
    rsa_sp800_56b_check_public, rsa_sp800_56b_derive_params_from_pq,
    rsa_sp800_56b_generate_key, rsa_sp800_56b_pairwise_test,
    rsa_sp800_56b_validate_strength, rsa_todata, rsa_validate_pairwise,
    rsa_validate_private and rsa_validate_public.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13040)
2020-10-07 09:04:51 +10:00
Matt Caswell d8652be06e Run the withlibctx.pl script
Automatically rename all instances of _with_libctx() to _ex() as per
our coding style.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12970)
2020-10-01 09:25:20 +01:00
Pauli 1be63951f8 prov: prefix all OSSL_DISPATCH tables names with ossl_
This stops them leaking into other namespaces in a static build.
They remain internal.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13013)
2020-09-29 16:31:46 +10:00
Matt Caswell ce64d3eee0 Move SM2 asymmetric encryption to be available in the default provider
Fixes #12908

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12913)
2020-09-25 11:13:53 +01:00
Shane Lontis 7a810fac86 Add 'fips-securitychecks' option and plumb this into the actual fips checks
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/12745)
2020-09-18 14:20:39 +01:00
Shane Lontis 8d17cca5b8 Add fips checks for rsa encryption
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/12745)
2020-09-18 14:20:38 +01:00
Pauli 87fe138d35 asymciphers: add FIPS error state handling
Check for provider being runnable in newctx, init, encrypt and decrypt.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12801)
2020-09-12 16:46:20 +10:00
Pauli 1017ab21e4 provider: add the unused paramater tag to the gettable and settable functions
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/12603)
2020-08-12 08:43:37 +10:00
Pauli af5e1e852d gettables: provider changes to pass the provider context.
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12581)
2020-08-07 08:02:14 +10:00
Dr. Matthias St. Pierre 363b1e5dae Make the naming scheme for dispatched functions more consistent
The new naming scheme consistently usese the `OSSL_FUNC_` prefix for all
functions which are dispatched between the core and providers.

This change includes in particular all up- and downcalls, i.e., the
dispatched functions passed from core to provider and vice versa.

- OSSL_core_  -> OSSL_FUNC_core_
- OSSL_provider_ -> OSSL_FUNC_core_

For operations and their function dispatch tables, the following convention
is used:

  Type                 | Name (evp_generic_fetch(3))       |
  ---------------------|-----------------------------------|
  operation            | OSSL_OP_FOO                       |
  function id          | OSSL_FUNC_FOO_FUNCTION_NAME       |
  function "name"      | OSSL_FUNC_foo_function_name       |
  function typedef     | OSSL_FUNC_foo_function_name_fn    |
  function ptr getter  | OSSL_FUNC_foo_function_name       |

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12222)
2020-06-24 22:01:22 +02:00
Dr. Matthias St. Pierre 23c48d94d4 Rename <openssl/core_numbers.h> -> <openssl/core_dispatch.h>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12222)
2020-06-24 22:01:22 +02:00
Richard Levitte f7f53d7d61 PROV: Use rsa_padding_add_PKCS1_OAEP_mgf1_with_libctx() in RSA-OAEP
Fixes #11904

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/11959)
2020-05-27 12:42:20 +02:00
Richard Levitte 5606922c3d PROV: Fix RSA-OAEP memory leak
The OAEP label wasn't freed when the operation context was freed.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11927)
2020-05-26 07:56:30 +02:00
Shane Lontis b808665265 Update core_names.h fields and document most fields.
Renamed some values in core_names i.e Some DH specific names were changed to use DH instead of FFC.
Added some strings values related to RSA keys.
Moved set_params related docs out of EVP_PKEY_CTX_ctrl.pod into its own file.
Updated Keyexchange and signature code and docs.
Moved some common DSA/DH docs into a shared EVP_PKEY-FFC.pod.
Moved Ed25519.pod into EVP_SIGNATURE-ED25519.pod and reworked it.

Added some usage examples. As a result of the usage examples the following change was also made:
ec allows OSSL_PKEY_PARAM_USE_COFACTOR_ECDH as a settable gen parameter.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11610)
2020-05-26 13:53:07 +10:00
Richard Levitte 106ec30bc7 PROV & ASYM_CIPHER: Adapt the RSA asymmetric cipher code for PSS-parameters
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11710)
2020-05-14 12:17:13 +02:00
Matt Caswell 33388b44b6 Update copyright year
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11616)
2020-04-23 13:55:52 +01:00
Matt Caswell 0f2deef59d Use RAND_bytes_ex in crypto/rsa
At various points in crypto/rsa we need to get random numbers. We should
ensure that we use the correct libctx when doing so.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/11355)
2020-03-19 18:49:12 +00:00
Pauli c5f8713443 Deprecate the low level RSA functions.
Use of the low level RSA functions has been informally discouraged for a
long time. We now formally deprecate them.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11063)
2020-02-20 18:58:40 +10:00
Pauli 5472821ece Coverity 1458439: fix resource leak
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11101)
2020-02-17 19:29:04 +10:00
Matt Caswell afb638f137 Make the RSA ASYM_CIPHER implementation available inside the FIPS module
RSA ASYM_CIPHER was already available within the default provider. We
now make it also available from inside the FIPS module.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/10881)
2020-02-13 14:14:30 +00:00
Richard Levitte 31a796d1cc PROV: Implement padding mode words in the RSA ASYM_CIPHER implementation
Because the libcrypto code has relinquished control of exact words to
express padding mode choices, we re-implement them in the appropriate
provider implementation.

For the sake of legacy controls, we maintain support for the numeric
form of the padding mode, but leave that support otherwise undeclared.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/10947)
2020-02-04 19:32:37 +01:00
Richard Levitte c24937d5e7 Add internal maxsize macros
We've started to see "magic" numbers being used for certain sizes,
such as algorithm names and property query strings.

This change takes care of the few items where buffers for algorithm
names and property query strings are used.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/10928)
2020-01-23 17:17:47 +01:00
Matt Caswell d9a7510747 Teach the RSA implementation about TLS RSA Key Transport
In TLSv1.2 a pre-master secret value is passed from the client to the
server encrypted using RSA PKCS1 type 2 padding in a ClientKeyExchange
message. As well as the normal formatting rules for RSA PKCA1 type 2
padding TLS imposes some additional rules about what constitutes a well
formed key. Specifically it must be exactly the right length and
encode the TLS version originally requested by the client (as opposed to
the actual negotiated version) in its first two bytes.

All of these checks need to be done in constant time and, if they fail,
then the TLS implementation is supposed to continue anyway with a random
key (and therefore the connection will fail later on). This avoids
padding oracle type attacks.

This commit implements this within the RSA padding code so that we keep
all the constant time padding logic in one place. A later commit will
remove it from libssl.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/10411)
2019-12-05 16:12:18 +00:00