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9.1 Quality of random numbers

Libgcypt offers random numbers of different quality levels:

— Data type: gcry_random_level_t

The constants for the random quality levels are of this enum type.

GCRY_WEAK_RANDOM
For all functions, except for gcry_mpi_randomize, this level maps to GCRY_STRONG_RANDOM. If you do not want this, consider using gcry_create_nonce.
GCRY_STRONG_RANDOM
Use this level for session keys and similar purposes.
GCRY_VERY_STRONG_RANDOM
Use this level for long term key material.