Clear sensitive memory without getting optimized out#636

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real-or-random wants to merge 9 commits intobitcoin-core:masterfrom

real-or-random:cleanse

Commits on Apr 27, 2020

Don't clear secrets in pippenger implementation
real-or-random
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Add secp256k1_memclear() for clearing secret data
real-or-random
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Make _set_fe_int( . , 0 ) set magnitude to 0
real-or-random
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Separate secp256k1_fe_set_int( . , 0 ) from secp256k1_fe_clear()

real-or-random
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isle2983
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Separate between clearing memory and setting to zero in tests

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Use secp256k1_memclear() to clear stack memory instead of memset()

real-or-random
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isle2983
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Implement various _clear() functions with secp256k1_memclear()
real-or-random
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Don't rely on memset to set signed integers to 0
real-or-random
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Introduce separate _clean functions for hash module
real-or-random
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