Thanks, but I seem to be producing incorrect results. The expected result for a BLAKE2b-384 digest of "1234567890" is 5a5f07b659b97436674e047c1f68d2513aea801e8722aeba5af5a3bf4fd20032b1e0182078389a1b76bae77f1d536950
and the program below is producing a digest of F54AEB1C4848FB988266C7E347C15F6CB4B2D896FC7A7127074C956508192ED8C7644AC492999532207986D10EF43652 std::string hash(std::string input) { CryptoPP::byte const* pbData = (CryptoPP::byte*)input.data(); unsigned int nDataLen = input.length(); CryptoPP::byte abDigest[48]; CryptoPP::BLAKE2b(48).CalculateTruncatedDigest(abDigest, 48, pbData, nDataLen); return std::string((char*)abDigest, 48); } std::string to_hex(const std::string& input) { CryptoPP::byte const* pbData = (CryptoPP::byte*)input.data(); unsigned int nDataLen = input.length(); std::string output; CryptoPP::HexEncoder hex(new CryptoPP::StringSink(output)); hex.Put(pbData, nDataLen); hex.MessageEnd(); return output; } int main(int argc, char* argv[]) { std::string text = "1234567890"; std::cout << to_hex(hash(text)) std::endl; return 0; } Also changing the digest length for other lengths seems to produce just the first `x` bytes of a larger hash i.e. for the string "1234567890" I.e. the following: BLAKE2b_384: F54AEB1C4848FB988266C7E347C15F6CB4B2D896FC7A7127074C956508192ED8C7644AC492999532207986D10EF43652 BLAKE2b_320: F54AEB1C4848FB988266C7E347C15F6CB4B2D896FC7A7127074C956508192ED8C7644AC492999532 BLAKE2b_256: F54AEB1C4848FB988266C7E347C15F6CB4B2D896FC7A7127074C956508192ED8 BLAKE2b_224: F54AEB1C4848FB988266C7E347C15F6CB4B2D896FC7A7127074C9565 BLAKE2b_192: F54AEB1C4848FB988266C7E347C15F6CB4B2D896FC7A7127 BLAKE2b_128: F54AEB1C4848FB988266C7E347C15F6C BLAKE2b_64: F54AEB1C4848FB98 -- You received this message because you are subscribed to "Crypto++ Users". More information about Crypto++ and this group is available at http://www.cryptopp.com and http://groups.google.com/forum/#!forum/cryptopp-users. --- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.