i am wondering which conditions apply if i want to use an Open Source cryptographic library embedded in a proprietary software.
The software will be proprietary and shall implement a digital signature verification. This verification may be implemented by the means of an Open Source library.
Intent is to rely on an Open Source cryptographic library such as OpenSSL, LibreSSl, GNUTLS... which may fulfill this purpose of digital signature verification.
Does one of this library (or one another) be permissive enough in order to let this digital signature verification being implemented, without implying that overall code and binary getting Open Source, and without implying that end user shall be notified of the cryptographic library being used ? We won't be able to notify the end user of the license (embedded software).