Update crypto code from Catacomb 2.5.0

This change committed automatically by `import-catacomb-crypto'.

  * Import new `ed25519-tests.in' from upstream `pub/t/ed25519.djb' and
    `pub/t/ed25519.local'.
  * Import new `ed25519.c' from upstream `pub/ed25519.c'.
  * Import new `ed25519.h' from upstream `pub/ed25519.h'.
  * Import new `ed448-tests.in' from upstream `pub/t/ed448'.
  * Import new `ed448.c' from upstream `pub/ed448.c'.
  * Import new `ed448.h' from upstream `pub/ed448.h'.
  * Import new `f25519-tests.in' from upstream `math/t/f25519'.
  * Import new `f25519.c' from upstream `math/f25519.c'.
  * Import new `f25519.h' from upstream `math/f25519.h'.
  * Import new `fgoldi-tests.in' from upstream `math/t/fgoldi'.
  * Import new `fgoldi.c' from upstream `math/fgoldi.c'.
  * Import new `fgoldi.h' from upstream `math/fgoldi.h'.
  * Import new `keccak1600-tests.in' from upstream `symm/t/keccak1600'.
  * Import new `keccak1600.c' from upstream `symm/keccak1600.c'.
  * Import new `keccak1600.h' from upstream `symm/keccak1600.h'.
  * Import new `montladder.h' from upstream `math/montladder.h'.
  * Import new `qfarith.h' from upstream `math/qfarith.h'.
  * Import new `scaf.c' from upstream `math/scaf.c'.
  * Import new `scaf.h' from upstream `math/scaf.h'.
  * Import new `scmul.h' from upstream `math/scmul.h'.
  * Import new `sha3-tests.in' from upstream
    `symm/t/SHA3_224LongMsg.rsp', `symm/t/SHA3_224Monte.rsp',
    `symm/t/SHA3_224ShortMsg.rsp', `symm/t/SHA3_256LongMsg.rsp',
    `symm/t/SHA3_256Monte.rsp', `symm/t/SHA3_256ShortMsg.rsp',
    `symm/t/SHA3_384LongMsg.rsp', `symm/t/SHA3_384Monte.rsp',
    `symm/t/SHA3_384ShortMsg.rsp', `symm/t/SHA3_512LongMsg.rsp',
    `symm/t/SHA3_512Monte.rsp', `symm/t/SHA3_512ShortMsg.rsp',
    `symm/t/SHAKE128LongMsg.rsp', `symm/t/SHAKE128ShortMsg.rsp',
    `symm/t/SHAKE128VariableOut.rsp', `symm/t/SHAKE256LongMsg.rsp',
    `symm/t/SHAKE256ShortMsg.rsp', `symm/t/SHAKE256VariableOut.rsp', and
    `symm/t/sha3.local'.
  * Import new `sha3.c' from upstream `symm/sha3.c'.
  * Import new `sha3.h' from upstream `symm/sha3.h'.
  * Import new `x25519-tests.in' from upstream `pub/t/x25519'.
  * Import new `x25519.c' from upstream `pub/x25519.c'.
  * Import new `x25519.h' from upstream `pub/x25519.h'.
  * Import new `x25519.slow-tests.in' from upstream `pub/t/x25519.slow'.
  * Import new `x448-tests.in' from upstream `pub/t/x448'.
  * Import new `x448.c' from upstream `pub/x448.c'.
  * Import new `x448.h' from upstream `pub/x448.h'.
  * Import new `x448.slow-tests.in' from upstream `pub/t/x448.slow'.

Upstream-URL: https://git.distorted.org.uk/~mdw/catacomb/
Upstream-Revision: ad7da99a043dab9addc7fce6b22b30f12c7676e6