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mbedtls/ChangeLog.d/fix_ccm_add_length_check.txt

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Fix additional data length field check for CCM The CCM specification (NIST SP 800-38C) mandates that the formatting of the additional data length l(a) changes when it is greater _or equal_ to 2^16 - 2^8 (>= 0xFF00). Since such lengths are not supported in mbed TLS, the operation should fail in such cases. This commit fixes an off-by-one error which allowed encryption/decryption to be executed when l(a) was equal to 0xFF00, resulting in an incorrect/non-standard length format being used. Fixes #3719. Signed-off-by: Fredrik Strupe <fredrik.strupe@silabs.com>
2020-10-08 11:52:50 +02:00
Bugfix
* Fix an off-by-one error in the additional data length check for
CCM, which allowed encryption with a non-standard length field.
Fixes #3719.
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