crypto: fix large DH generator validation #8434

Job	Run time
Build slim tarball	1m 34s
aarch64-linux: Cache V8 build	34s
aarch64-darwin: with shared libraries	23m 3s
x86_64-darwin: with shared libraries	45m 9s
x86_64-linux: with shared libraries	26m 33s
aarch64-linux: with shared openssl-4.0.1	23m 34s
aarch64-linux: with shared openssl-1.1.1w	23m 35s
aarch64-linux: with shared openssl-3.6.2	23m 42s
aarch64-linux: with shared openssl-3.0.21	24m 25s
aarch64-linux: with shared boringssl-0.20260526.0	23m 30s
aarch64-linux: with shared openssl-3.5.7	23m 30s
	3h 59m 9s

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