diff options
author | Dr. Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> | 2018-10-10 01:53:29 +0200 |
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committer | Dr. Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> | 2018-10-16 22:32:42 +0200 |
commit | dbf0a496252b91c1fe52c9129dc0a5361a4589a8 (patch) | |
tree | 44fa333ec3a4a84e491c2f55ea02da5b4c264f55 /crypto/err/openssl.txt | |
parent | 26d97bf6b22a4d5fa3a2467eed8c86c521fe3c66 (diff) |
DRBG: fix reseeding via RAND_add()/RAND_seed() with large input
In pull request #4328 the seeding of the DRBG via RAND_add()/RAND_seed()
was implemented by buffering the data in a random pool where it is
picked up later by the rand_drbg_get_entropy() callback. This buffer
was limited to the size of 4096 bytes.
When a larger input was added via RAND_add() or RAND_seed() to the DRBG,
the reseeding failed, but the error returned by the DRBG was ignored
by the two calling functions, which both don't return an error code.
As a consequence, the data provided by the application was effectively
ignored.
This commit fixes the problem by a more efficient implementation which
does not copy the data in memory and by raising the buffer the size limit
to INT32_MAX (2 gigabytes). This is less than the NIST limit of 2^35 bits
but it was chosen intentionally to avoid platform dependent problems
like integer sizes and/or signed/unsigned conversion.
Additionally, the DRBG is now less permissive on errors: In addition to
pushing a message to the openssl error stack, it enters the error state,
which forces a reinstantiation on next call.
Thanks go to Dr. Falko Strenzke for reporting this issue to the
openssl-security mailing list. After internal discussion the issue
has been categorized as not being security relevant, because the DRBG
reseeds automatically and is fully functional even without additional
randomness provided by the application.
Fixes #7381
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/7382)
(cherry picked from commit 3064b55134434a0b2850f07eff57120f35bb269a)
Diffstat (limited to 'crypto/err/openssl.txt')
-rw-r--r-- | crypto/err/openssl.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/crypto/err/openssl.txt b/crypto/err/openssl.txt index 2c8572ba64..5003d8735a 100644 --- a/crypto/err/openssl.txt +++ b/crypto/err/openssl.txt @@ -1014,6 +1014,7 @@ RAND_F_RAND_POOL_ACQUIRE_ENTROPY:122:rand_pool_acquire_entropy RAND_F_RAND_POOL_ADD:103:rand_pool_add RAND_F_RAND_POOL_ADD_BEGIN:113:rand_pool_add_begin RAND_F_RAND_POOL_ADD_END:114:rand_pool_add_end +RAND_F_RAND_POOL_ATTACH:124:rand_pool_attach RAND_F_RAND_POOL_BYTES_NEEDED:115:rand_pool_bytes_needed RAND_F_RAND_POOL_NEW:116:rand_pool_new RAND_F_RAND_WRITE_FILE:112:RAND_write_file |