OpenSSL is an omnipresent tool when it comes to encryption. While in Java we are used to the native Java implementations of cryptographic primitives, most other languages rely on OpenSSL.
Yesterday I was investigating the encryption used by one open source tool written in C, and two things looked strange: they were using a 192 bit key for AES 256, and they were using a 64-bit IV (initialization vector) instead of the required 128 bits (in fact, it was even a 56-bit IV).