schnorrsig: clear out masked secret key in BIP-340 nonce function #1650

1. 
   theStack commented at 3:24 am on January 29, 2025: contributor

   Considering that the secret key can be determined from masked_key if the passed auxiliary data is known (which is optional and set to all-zeros if not explicitly provided, see ZERO_MASK), it seems reasonable to clear it from the stack.
2. schnorrsig: clear out masked secret key in BIP-340 nonce function a82287fb85
3. real-or-random approved
4. 
   real-or-random commented at 8:38 am on January 29, 2025: contributor

   utACK a82287fb85746e0f7ea142a68a859e56ee86ee10
5. jonasnick approved
6. 
   jonasnick commented at 2:01 pm on January 29, 2025: contributor

   ACK a82287fb85746e0f7ea142a68a859e56ee86ee10
7. jonasnick merged this on Jan 29, 2025
8. jonasnick closed this on Jan 29, 2025

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9. theStack deleted the branch on Jan 29, 2025

Contributors
theStack real-or-random jonasnick