This directory contains implementations of obsolete cryptographic primitives that we still need for compatibility with deployed protocols or file formats. All new uses of this code require approval by a //CRYPTO_OWNERS member. This requirement is enforced by requiring client code to be added to a friend list for the specific obsolete primitive that the client code wants to use, which has to be done by a crypto owner.
If you are designing a new protocol, or writing a new implementation, and believe you need to use one of these primitives, please contact a //CRYPTO_OWNERS member or [email protected].