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?
Has anybody Implemented ElGamal using OpenSSL or even inside?
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Implementation of ElGamal using OpenSSL BIGNUM is mentioned here (file list here). Please see if it can help you.