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Here are five test vectors for secp256k1, which I just generated with my own code. My code is a generic implementation of elliptic curves; it has been tested for many curves for which test vectors were available (in particular the NIST curves) so I tend to believe that it is correct. Each test vector is a value $m$ (chosen randomly modulo the curve order ...

<------------- key -------------> <-- plaintext -> <- ciphertext -> E62CABB93D1F3BDC 524FDF91A279C297 DD16B3D004069AB3 8ADDBD2290E565CE B619F870574A9E80 DAE6AB34C22CD626 058B92A4B28FB4EB A53DDC6B3098008F 6132C42C3E5E94EF 7A5152BF19AB739D 91993307EFBFB13C D13105386083E517 0245EAFE62DF92BF E319C29E9E2C3EA1 58BAA732CF5DBD77 EF37441D1FE7B73A ...

Normally, test vectors, in particular test vectors for intermediate values, are to be found with whatever is the "official specification" for that algorithm. MARS has not been blessed with a standard (few algorithms are), so the "official specification" is what IBM distributes, in particular the MARS package (compressed archive). This package contains the ...

There seem to be no standardized ElGamal test vectors available in the public domain. However, there are some ElGamal test vectors generated with libgcrypt 1.5.0 available in this fork of the pycrypto project.