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Write a change log from mbedcrypto-2.0.0 to the merge of #75

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Get started on writing a change log file for Mbed Crypto. I went
through pull requests merged since the tag mbedcrypto-2.0.0 and up
to #75, i.e. commit 9ab7c07f1f.
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Gilles Peskine 2019-10-05 11:27:39 +02:00
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# Mbed Crypto change history
## Unreleased changes
### Interface changes
* In the PSA API, forbid zero-length keys. To pass a zero-length input to a key derivation function, use a buffer instead (this is now always possible).
### New features
* Key derivation inputs in the PSA API can now either come from a key object or from a buffer regardless of the step type.
### Bug fixes
* Fix a buffer overflow in the PSA HMAC code when using a long key with an unsupported algorithm. Fixes #254.
* Fix `mbedtls_asn1_get_int` to support any number of leading zeros.
* Fix `mbedtls_asn1_get_bitstring_null` to correctly parse bitstrings of at most 2 bytes.
### Performance improvements
* Remove a useless call to mbedtls_ecp_group_free(). Contributed by Alexander Krizhanovsky in #210.
* Speed up PBKDF2 by caching the digest calculation. Contributed by Jack Lloyd and Fortanix Inc in #277.
### Other changes
* Remove the technical possibility to define custom md_info structures, which was exposed only in an internal header.
## Mbed Crypto 2.0.0