Merge branch 'ppc-chacha-core'

diff --cc ChangeLog
index 6626c6eac2c2efc63b74a7a34fe8ff196f4d7d5c,1603036970128ac07ea7bb6d51a36ef39ab2768f..218fa39452df3897233c6ce9574dfb2eaae0228b
--- 1/ChangeLog
--- 2/ChangeLog
+++ b/ChangeLog
@@@ -1,51 -1,17 +1,66 @@@
 -      * powerpc64/fat/chacha-core-internal-2.asm: New file.
+ 2020-11-07  Niels Möller  <nisse@lysator.liu.se>
+ 
++      Merged initial powerpc64 implementation of chacha.
+       * configure.ac: New command line option --enable-power-altivec.
+       Update asm_path logic, and add altivec to FAT_TEST_LIST.
+       * fat-ppc.c (get_ppc_features): Add logic to check for altivec and
+       vsx support, and select aither C or altivec implementation of
+       chacha_core.
++      * powerpc64/p7/chacha-core-internal.asm: New file.
+ 
+ 2020-09-25  Niels Möller  <nisse@lysator.liu.se>
+ 
+       * powerpc64/p7/chacha-core-internal.asm: New file.
+       * Makefile.in (distdir): Add powerpc64/p7.
+ 
 +2020-10-29  Niels Möller  <nisse@lysator.liu.se>
 +
 +      * blowfish.c (blowfish_set_key): Add casts to uint32_t. Avoids
 +      undefined behavior, since shifting an 8-bit value left by 24 bits
 +      overflows the range of signed int. Reported by Guido Vranken.
 +
 +2020-10-28  Niels Möller  <nisse@lysator.liu.se>
 +
 +      * gmp-glue.h (cnd_add_n, cnd_sub_n, cnd_swap): Deleted, use
 +      corresponding functions mpn_cnd_add_n, mpn_cnd_sub_n,
 +      mpn_cnd_swap, available from GMP version 6.1.0. Update all
 +      callers, in particular, mpn_cnd_add_n and mpn_cnd_sub_n has one
 +      more argument than the old functions.
 +
 +      * gmp-glue.c (mpn_cnd_add_n, mpn_cnd_sub_n, mpn_cnd_swap)
 +      [NETTLE_USE_MINI_GMP]: Fallback definitions or mini-gmp builds.
 +
 +2020-10-14  Niels Möller  <nisse@lysator.liu.se>
 +
 +      * ecc-mod-arith.c (ecc_mod_pow_2k, ecc_mod_pow_2k_mul): Moved
 +      functions here.
 +      * ecc-internal.h (ecc_mod_pow_2kp1): New macro, calling the more
 +      general ecc_mod_pow_2k_mul.
 +      * ecc-curve25519.c (ecc_mod_pow_2kp1): Deleted static function.
 +      * ecc-curve448.c (ecc_mod_pow_2k, ecc_mod_pow_2kp1): Deleted
 +      static functions.
 +
 +2020-10-13  Niels Möller  <nisse@lysator.liu.se>
 +
 +      * ecc-mod-inv.c (ecc_mod_inv_destructive): New helper function,
 +      not preserving input argument. Extracted from old ecc_mod_inv.
 +      (ecc_mod_inv): Call ecc_mod_inv_destructive.
 +      (ecc_mod_inv_redc): New inversion function, with input and output
 +      in redc form.
 +
 +      * ecc-secp224r1.c: Select between ecc_mod_inv and ecc_mod_inv_redc.
 +      * ecc-secp256r1.c: Likewise.
 +
 +      * ecc-j-to-a.c (ecc_j_to_a): Simplify redc-related logic, taking
 +      advantage of ecc->p.invert handling redc, when appropriate. Reduce
 +      scratch need from 5n to 4n in the process (assuming inversion
 +      needs 2n).
 +
 +      * testsuite/ecc-modinv-test.c (ref_modinv): Updated to do redc, if
 +      appropriate.
 +
 +2020-09-25  Niels Möller  <nisse@lysator.liu.se>
 +
        * gcm.c (gcm_fill): Added separate implementations for big- and
        little-endian, to use uint64_t stores and less overhead.