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Asked: 2026-06-01T02:17:29+00:00

I’m looking for an example of using OpenSSL’s AES CCM encryption. Apparently, this is

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I’m looking for an example of using OpenSSL’s AES CCM encryption. Apparently, this is one of the two ‘custom’ cipher modes that require additional setup beyond EVP_CipherInit_ex(). Any suggestions would be appreciated.

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  1. Editorial Team

    In short:

    // Tell the alg we will encrypt Psize bytes
int outl = 0;
EVP_EncryptUpdate(ctx, 0, &outl, 0, Psize);

// Add the AAD
EVP_EncryptUpdate(ctx, 0, &outl, A, Asize);

// Now we encrypt the data in P, placing the output in CT
EVP_EncryptUpdate(ctx, CT, &outl, P, Psize);

    For more details, please see my blog post on this, http://www.fredriks.se/?p=23.

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