[CI test, dontmerge] PR #1579 with secp256k1_memclear using volatile_memset#1622

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Commits on Oct 22, 2024

Don't clear secrets in pippenger implementation

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Add secp256k1_memclear() for clearing secret data

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Separate secp256k1_fe_set_int( . , 0 ) from secp256k1_fe_clear()

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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()

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Implement various _clear() functions with secp256k1_memclear()

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Don't rely on memset to set signed integers to 0

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Introduce separate _clear functions for hash module

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Clear _gej instances after point multiplication to avoid potential leaks
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secp256k1_memclear: enforce variant using volatile_memset (for CI testing)
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