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echo -n hello | 
openssl dgst -verify pubkey.pem -signature hello.sig -sha1 \
             -sigopt rsa_padding_mode:pss -sigopt rsa_pss_saltlen:20

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use Crypt::RSA;
...

# $verify returns true, it worked.
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...
$signature = pack ("H*", '03808458…..73E92');   

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