[mbed-tls] 3.0 proposal: remove support for MD2, MD4, RC4, Blowfish and XTEA

Hi,

We consider removing the support for MD2, MD4, RC4, Blowfish and XTEA from Mbed TLS 3.0 (but the support will remain in the 2.16 and 2.2x LTS branches for the course of their lifetime).

If you use one of those cryptographic primitives and think it should remain in Mbed TLS 3.0, please let us know and explain why.

You can find more information in the following GitHub issue: https://github.com/ARMmbed/mbedtls/issues/4084.

Best regards, Ronald Cron.