…m#29889)

…m#29889)

* fix: use aes blocksize

Co-Authored-By: Gary Rong <garyrong0905@gmail.com>

* fix: ECIES invalid-curve handling (ethereum#33669)

Fix ECIES invalid-curve handling in RLPx handshake (reject invalid
ephemeral pubkeys early)
- Add curve validation in crypto/ecies.GenerateShared to reject invalid
public keys before ECDH.
- Update RLPx PoC test to assert invalid curve points fail with
ErrInvalidPublicKey.

Motivation / Context
RLPx handshake uses ECIES decryption on unauthenticated network input.
Prior to this change, an invalid-curve ephemeral public key would
proceed into ECDH and only fail at MAC verification, returning
ErrInvalidMessage. This allows an oracle on decrypt success/failure and
leaves the code path vulnerable to invalid-curve/small-subgroup attacks.
The fix enforces IsOnCurve validation up front.

* fix: define NDEBUG only if not defined (ethereum#27550)

* fix: harden secp256k1 validation and introduce EllipticCurve interface

* refactor: change receiver variable name to lowercase (ethereum#29889)

* refactor: remove hardcoded value for secp256k1.N (ethereum#30126)

* fix: add IsOnCurve check (ethereum#31100)

* feat: update libsecp256k1 (ethereum#31242)

Updates the libsecp256k1 dependency to commit:
c0d9480fbbf8eccbd4be23ed27f6f2af6f3b211e

PR:
```
BenchmarkSign-24    	   57756	     21214 ns/op	     164 B/op	       3 allocs/op
BenchmarkRecover-24    	   37156	     33044 ns/op	      80 B/op	       1 allocs/op
BenchmarkEcrecoverSignature-24    	   36889	     32935 ns/op	      80 B/op	       1 allocs/op
BenchmarkVerifySignature-24    	   41163	     29207 ns/op	       0 B/op	       0 allocs/op
BenchmarkDecompressPubkey-24    	  318624	      4062 ns/op	     304 B/op	       6 allocs/op
```

Master:
```
BenchmarkSign-24    	   34509	     35330 ns/op	     164 B/op	       3 allocs/op
BenchmarkRecover-24    	   25418	     47725 ns/op	      80 B/op	       1 allocs/op
BenchmarkEcrecoverSignature-24    	   25735	     47591 ns/op	      80 B/op	       1 allocs/op
BenchmarkVerifySignature-24    	   29108	     41097 ns/op	       0 B/op	       0 allocs/op
BenchmarkDecompressPubkey-24    	  294747	      4143 ns/op	     304 B/op	       6 allocs/op
```

Performance seems to be improved significantly:
```
Sign-24      34.86µ ± 3%   21.66µ ± 2%  -37.86% (p=0.000 n=10)
Recover-24   46.14µ ± 3%   33.24µ ± 2%  -27.95% (p=0.000 n=10)
```

* fix: coordinate check

---------

Co-authored-by: lightclient <lightclient@protonmail.com>
Co-authored-by: Gary Rong <garyrong0905@gmail.com>
Co-authored-by: fengjian <445077+fengjian@users.noreply.github.com>
Co-authored-by: Francisco de Borja Aranda Castillejo <me@fbac.dev>
Co-authored-by: SuiYuan <165623542+suiyuan1314@users.noreply.github.com>
Co-authored-by: zhiqiangxu <652732310@qq.com>
Co-authored-by: Felix Lange <fjl@twurst.com>
Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de>