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9.1 Quality of random numbers | Libgcrypt uses different quality levels. | |
9.2 Retrieving random numbers | How to retrieve random numbers. |
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Libgcypt offers random numbers of different quality levels:
GCRY_WEAK_RANDOM
gcry_create_nonce
instead.
GCRY_STRONG_RANDOM
GCRY_VERY_STRONG_RANDOM
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Fill buffer with length random bytes using a random quality as defined by level.
Allocate a memory block consisting of nbytes fresh random bytes using a random quality as defined by level.
Allocate a memory block consisting of nbytes fresh random bytes
using a random quality as defined by level. This function
differs from gcry_random_bytes
in that the returned buffer is
allocated in a "secure" area of the memory.
Fill buffer with length unpredictable bytes. This is commonly called a nonce and may also be used for initialization vectors and padding. This is an extra function nearly independent of the other random function for 3 reasons: It better protects the regular random generator's internal state, provides better performance and does not drain the precious entropy pool.
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