Maintain state across GetStrongRandBytes calls #10338

1. 
   sipa commented at 5:18 pm on May 4, 2017: member

   This adds a 32-byte entropy pool that is maintained across calls to GetStrongRandomBytes(). As we’re already using SHA512 to combine the multiple entropy sources, which produces 64 bytes, we can use the last 32 of those as an additional input for the next call.

   This makes sure that the produced data is secure as long as any entropy source in the past was reliable.

   The entropy pool is initialized with zeroes (but not used before any OS and OpenSSL entropy are fed into it). In the future a more extensive seeding operation can be used to build the initial pool.

2. Maintain state across GetStrongRandBytes calls 97477c537e
3. 
   theuni commented at 6:04 pm on May 4, 2017: member

   utACK 97477c537e9e9d9b9a14ec2f965c9c6121ac818b
4. 
   instagibbs commented at 7:26 pm on May 4, 2017: member

   utACK https://github.com/bitcoin/bitcoin/pull/10338/commits/97477c537e9e9d9b9a14ec2f965c9c6121ac818b
5. 
   TheBlueMatt commented at 8:11 pm on May 4, 2017: member

   utACK 97477c537e9e9d9b9a14ec2f965c9c6121ac818b Nice!
6. dcousens approved
7. 
   dcousens commented at 0:15 am on May 5, 2017: contributor

   utACK
8. sipa merged this on May 9, 2017
9. sipa closed this on May 9, 2017

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Contributors
sipa theuni instagibbs TheBlueMatt dcousens