How do I create a key pair with ECC Algorithm and key size of 256 bits without using Keychain Access?

I am attempting to create the payment processing cert, and I do not have access to a Mac. I can create the merchant id with keytool just fine. But with keytool, it won't let me use a keysize below 512 bits. Any suggestions?

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kiddagger
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Why do you want to do it without using the Keychain Access?

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talthent_l
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