all: remove kilic dependency from bls12381 fuzzers (#30296)

The [kilic](https://github.com/kilic/bls12-381) bls12381 implementation
has been archived. It shouldn't be necessary to include it as a fuzzing
target any longer.

This also adds fuzzers for G1/G2 mul that use inputs that are guaranteed
to be valid. Previously, we just did random input fuzzing for these
precompiles.

go.mod

@@ -47,7 +47,6 @@ require (
 	github.com/jackpal/go-nat-pmp v1.0.2
 	github.com/jedisct1/go-minisign v0.0.0-20230811132847-661be99b8267
 	github.com/karalabe/hid v1.0.1-0.20240306101548-573246063e52
-	github.com/kilic/bls12-381 v0.1.0
 	github.com/kylelemons/godebug v1.1.0
 	github.com/mattn/go-colorable v0.1.13
 	github.com/mattn/go-isatty v0.0.20
@@ -116,6 +115,7 @@ require (
 	github.com/hashicorp/go-retryablehttp v0.7.4 // indirect
 	github.com/influxdata/line-protocol v0.0.0-20200327222509-2487e7298839 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/kilic/bls12-381 v0.1.0 // indirect
 	github.com/klauspost/compress v1.16.0 // indirect
 	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
 	github.com/kr/pretty v0.3.1 // indirect

oss-fuzz.sh

@@ -160,6 +160,10 @@ compile_fuzzer github.com/ethereum/go-ethereum/tests/fuzzers/bls12381 \
   FuzzG1Add fuzz_g1_add\
   $repo/tests/fuzzers/bls12381/bls12381_test.go
 
+compile_fuzzer github.com/ethereum/go-ethereum/tests/fuzzers/bls12381 \
+  FuzzCrossG1Mul fuzz_cross_g1_mul\
+  $repo/tests/fuzzers/bls12381/bls12381_test.go
+
 compile_fuzzer github.com/ethereum/go-ethereum/tests/fuzzers/bls12381 \
   FuzzG1Mul fuzz_g1_mul\
   $repo/tests/fuzzers/bls12381/bls12381_test.go
@@ -172,6 +176,10 @@ compile_fuzzer github.com/ethereum/go-ethereum/tests/fuzzers/bls12381 \
   FuzzG2Add fuzz_g2_add \
   $repo/tests/fuzzers/bls12381/bls12381_test.go
 
+compile_fuzzer github.com/ethereum/go-ethereum/tests/fuzzers/bls12381 \
+  FuzzCrossG2Mul fuzz_cross_g2_mul\
+  $repo/tests/fuzzers/bls12381/bls12381_test.go
+
 compile_fuzzer github.com/ethereum/go-ethereum/tests/fuzzers/bls12381 \
   FuzzG2Mul fuzz_g2_mul\
   $repo/tests/fuzzers/bls12381/bls12381_test.go
@@ -204,6 +212,10 @@ compile_fuzzer github.com/ethereum/go-ethereum/tests/fuzzers/bls12381 \
   FuzzCrossG2Add fuzz_cross_g2_add \
   $repo/tests/fuzzers/bls12381/bls12381_test.go
 
+compile_fuzzer github.com/ethereum/go-ethereum/tests/fuzzers/bls12381 \
+  FuzzCrossG2MultiExp fuzz_cross_g2_multiexp \
+  $repo/tests/fuzzers/bls12381/bls12381_test.go
+
 compile_fuzzer github.com/ethereum/go-ethereum/tests/fuzzers/bls12381 \
   FuzzCrossPairing fuzz_cross_pairing\
   $repo/tests/fuzzers/bls12381/bls12381_test.go