Fix AES 192 kdf #765
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Fix AES 192 kdf #765
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The test vectors are generated based on RFC 6188 section 7.4 . It demonstrates that the kdf for AES 192 is currently broken. It mistakenly uses the kdf in AES 256 mode as described in cisco#763.
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Set the kdf key length to be the determined input key length. This will set it correctly for AES ICM 128/192/256. In the case of AES GCM 128 & 256 it needs to be increased by 2 to match the corresponding AES ICM cipher. fixes cisco#763
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This was referenced Aug 28, 2025
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| srtp_err_status_t srtp_validate_aes_256(void); | ||
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| #ifdef GCM |
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I don't think this ifdef is needed here, you may want to run this test even when GCM is not enabled
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The GCM is miss used in this context, it indicates that the crypto engine is external as there is no internal implementation of AES 192 :( ... this should also be changed at some point.
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The kdf for AES 192 is currently broken, it mistakenly uses the kdf in AES 256 mode as described in #763.
First will commit a failing test and then the fix.