crypto(7)                 Erlang Application Definition                crypto(7)

       crypto - The Crypto Application

       The purpose of the Crypto application is to provide an Erlang API to
       cryptographic functions, see crypto(3erl). Note that the API is on a
       fairly low level and there are some corresponding API functions available
       in public_key(3erl), on a higher abstraction level, that uses the crypto
       application in its implementation.

       The current crypto implementation uses nifs to interface OpenSSLs crypto
       library and may work with limited functionality with as old versions as
       OpenSSL 0.9.8c. FIPS mode support requires at least version 1.0.1 and a
       FIPS capable OpenSSL installation. We recommend using a version that is
       officially supported by the OpenSSL project. API compatible backends like
       LibreSSL should also work.

       Source releases of OpenSSL can be downloaded from the OpenSSL project
       home page, or mirror sites listed there.

       The following configuration parameters are defined for the crypto
       application. See app(3erl) for more information about configuration

         fips_mode = boolean():
           Specifies whether to run crypto in FIPS mode. This setting will take
           effect when the nif module is loaded. If FIPS mode is requested but
           not available at run time the nif module and thus the crypto module
           will fail to load. This mechanism prevents the accidental use of non-
           validated algorithms.

         rand_cache_size = integer():
           Sets the cache size in bytes to use by
           crypto:rand_seed_alg(crypto_cache) and
           crypto:rand_seed_alg_s(crypto_cache). This parameter is read when a
           seed function is called, and then kept in generators state object. It
           has a rather small default value that causes reads of strong random
           bytes about once per hundred calls for a random value. The set value
           is rounded up to an integral number of words of the size these seed
           functions use.


Ericsson AB                        crypto 4.4                          crypto(7)