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Look at _hxxp://triade.studentenweb.org/GInt/gint.html.
"FGInt is a package I wrote in Delphi & Free Pascal to handle Fast Gigantic Integers, the size of these integers is merely bounded by the available memory."
RSA, ElGamal, DSA, GOSTDSA, ECC ElGamal, ECDSA and Prime generation implementation. With sources.
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