BigInt conversion (gmp Bigint to botan bigint)

I am using gmp to perform complex operation. I want to use Botan to perform cryptography functions. Problem is Bot开发者_开发技巧h of them have their own Bigint function. So its creating problem on supplying bigint value used in gmp function to Botan function.

Can anyone help in this?

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Use mpz_export to export the GMP integer and the BigInt(const byte[], size_t) constructor to import it.