Has anybody Implemented ElGamal using OpenSSL or even inside?

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I find out that OpenSSL hasn't implemented ElGamal. However, currently I need to use OpenSSL to implement ElGamal. I just wonder if anybody had done it before. And that may help me to reduce my work load. And, if not, is that feasible to implement ElGamal inside OpenSSL? I had tried to modify the souce code of DSA to implement ElGamal, will that yield some troubles that may not be able to find out easily?

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doptimusprime On

Implementation of ElGamal using OpenSSL BIGNUM is mentioned here (file list here). Please see if it can help you.