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GnuTLS is not a low-level cryptographic library, i.e., it does not provide access to basic cryptographic primitives. However it abstracts the internal cryptographic back-end (see Cryptographic Backend), providing symmetric crypto, hash and HMAC algorithms, as well access to the random number generation. For a low-level crypto API the usage of nettle 21 library is recommended.
|• Symmetric algorithms|
|• Public key algorithms|
|• Cryptographic Message Syntax / PKCS7|
|• Hash and MAC functions|
|• Random number generation|
|• Overriding algorithms|