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* eddsa-verify.c (equal_h): Use ecc_mod_mul_canonical.
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* ecc-mod-arith.c (ecc_mod_mul, ecc_mod_sqr): Separate argument
for scratch area, reducing required size of result area. Update
all callers to naïvely keep using result in scratch area.
(ecc_mod_pow_2k, ecc_mod_pow_2k_mul): Simplified, also reducing
required size of result area.
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* eddsa-internal.h (struct ecc_eddsa): New struct for eddsa
parameters.
* ed25519-sha512.c (_nettle_ed25519_sha512): New parameter struct.
* eddsa-expand.c (_eddsa_expand_key): Replace input
struct nettle_hash with struct ecc_eddsa, and generalize for
ed448. Update all callers.
* eddsa-sign.c (_eddsa_sign): Likewise.
* eddsa-verify.c (_eddsa_verify): Likewise.
* eddsa-compress.c (_eddsa_compress): Store sign bit in most
significant bit of last byte, as specified by RFC 8032.
* eddsa-decompress.c (_eddsa_decompress): Corresponding update.
Also generalize to support ed448, and make validity checks
stricter.
* testsuite/eddsa-sign-test.c (test_ed25519_sign): New function.
(test_main): Use it.
* testsuite/eddsa-verify-test.c (test_ed25519): New function.
(test_main): Use it.
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* eddsa-verify.c (_eddsa_verify): Use function pointer rather than
calling ecc_add_eh directly. Preparation for eddsa over curve448.
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This adds all exported symbols in the map files explicitly under
the following rules:
- Symbols mentioned in internal headers go in a section which is
valid only for testing, and linking with these symbols will break
in library updates.
- Symbols mentioned in installed headers go in the exported sections
and are considered part of the ABI.
- All internal symbols move to internal headers.
- The _nettle_md5_compress and _nettle_sha1_compress become exported
without the _nettle prefix, due to existing usage.
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