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Janos Follath 2019-01-04 16:18:46 +00:00 committed by Darryl Green
parent 2f18490900
commit 12fff1520d
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@ -8,6 +8,11 @@ Security
as an ASN.1 INTEGER, which caused the size of the key to leak 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 about 1 bit of information on average and could cause the value to be
1 byte too large for the output buffer. 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 Features
* Add new API functions mbedtls_ssl_session_save() and * 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 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 mbedtls_ecdh_can_do() on each result to check whether each algorithm is
supported. 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 Bugfix
* Fix missing bounds checks in X.509 parsing functions that could * Fix missing bounds checks in X.509 parsing functions that could