This split in methods probably needs rearranging. This means most
callers (i.e. ones that don't use EVP_PKEY_CTX_new_id) will no longer
pick up the HKDF EVP method.
Bug: 497
Change-Id: I72ef255a472c458e8db62461f7b3ac65fa488535
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/52830
Reviewed-by: Adam Langley <agl@google.com>
OpenSSL 1.1.1 added HKDF support, but by sticking it into
EVP_PKEY_derive, the API meant for Diffie-Hellman-like primitives.
Implement it for OpenSSL compatibility.
This does unfortunately mean anything using EVP now pulls in HKDF. HKDF
isn't much code, but we should make EVP more static-linker-friendly.
(Filed https://crbug.com/boringssl/497)
Change-Id: I90b9b0d918129829eb36ba9d50ff4d8580346ff0
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/52829
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
David Benjamin
Adam Langley