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Merge remote-tracking branch 'restricted/pr/547' into development-restricted

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* restricted/pr/547:
  Add ChangeLog entries
  Update crypto submodule to include deterministic ECDSA RNG fix
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Jaeden Amero 2019-09-06 11:40:34 +01:00
commit 4799df79a0
2 changed files with 16 additions and 1 deletions
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15
ChangeLog
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@ -8,6 +8,11 @@ Security
as an ASN.1 INTEGER, which caused the size of the key to leak
about 1 bit of information on average and could cause the value to be
1 byte too large for the output buffer.
* The deterministic ECDSA calculation reused the scheme's HMAC-DRBG to
implement blinding. Because of this for the same key and message the same
blinding value was generated. This reduced the effectiveness of the
countermeasure and leaked information about the private key through side
channels. Reported by Jack Lloyd.
Features
* Add new API functions mbedtls_ssl_session_save() and
@ -40,6 +45,16 @@ API Changes
just curves for which both are supported. Call mbedtls_ecdsa_can_do() or
mbedtls_ecdh_can_do() on each result to check whether each algorithm is
supported.
* The following function in the ECDSA module has been deprecated and replaced
as shown below. The new function can take an RNG function as an argument
which is necessary for adequate blinding.
mbedtls_ecdsa_sign_det() -> mbedtls_ecdsa_sign_det_ext()
New deprecations
* Deprecate mbedtls_ecdsa_sign_det() in favor of a functions that can take an
RNG function as an input.
* Calling mbedtls_ecdsa_write_signature() with NULL as the f_rng argument
is now deprecated.
Bugfix
* Fix missing bounds checks in X.509 parsing functions that could

2
crypto

@ -1 +1 @@
Subproject commit f0716542c458a53106ae97788321b97a7910baef
Subproject commit c7cde03feca387ae32a29d9845dd28a3020f0d97