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a47b82c20a
* Used bignum helper API instead of memcpy
* changed the key length output to the size of the curve because:
- using the bignum produces a bigger size than the curve size
due to the limb size being 8 bytes and import key rejects
the key if it's not exactly curve size.
- we know that the generated key is filled with leading
zeros becuase the generated key is bounded by the modulas.
* skipped leading zeros when passing the buffer to import_key()
due to the intermediate buffer allocated to the maximum size
possible and import_key() needs the exact size.
Signed-off-by: Waleed Elmelegy <waleed.elmelegy@arm.com>