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e694c3ef3e
Prior to this commit, the security parameter struct `ssl_transform` contained a `ciphersuite_info` field pointing to the information structure for the negotiated ciphersuite. However, the only information extracted from that structure that was used in the core encryption and decryption functions `ssl_encrypt_buf`/`ssl_decrypt_buf` was the authentication tag length in case of an AEAD cipher. The present commit removes the `ciphersuite_info` field from the `ssl_transform` structure and adds an explicit `taglen` field for AEAD authentication tag length. This is in accordance with the principle that the `ssl_transform` structure should contain the raw parameters needed for the record encryption and decryption functions to work, but not the higher-level information that gave rise to them. For example, the `ssl_transform` structure implicitly contains the encryption/decryption keys within their cipher contexts, but it doesn't contain the SSL master or premaster secrets. Likewise, it contains an explicit `maclen`, while the status of the 'Truncated HMAC' extension -- which determines the value of `maclen` when the `ssl_transform` structure is created in `ssl_derive_keys` -- is not contained in `ssl_transform`. The `ciphersuite_info` pointer was used in other places outside the encryption/decryption functions during the handshake, and for these functions to work, this commit adds a `ciphersuite_info` pointer field to the handshake-local `ssl_handshake_params` structure. |
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