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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?

Kjuly
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Vincent
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  • (Yes, I know this is an old question.) ElGamal is ambiguous: The ElGamal *encryption* algorithm has found relatively widespread use in PGP and later OpenPGP. The ElGamal *signature* scheme (which appears to be the topic of this question) has never been widely used, and instead its derivate DSA has become very widespread, because it is cheaper to calculate and has much smaller signatures. – Arne Vogel May 19 '19 at 16:33

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

doptimusprime
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