crypto: atmel-ecc - reject hardware ECDH without a public key

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The hardware ECDH path in atmel_ecdh_compute_shared_secret() uses the
private key stored in the device. However, the public key is cached only
after atmel_ecdh_set_secret() successfully generated that private key
for the current tfm.

atmel_ecdh_generate_public_key() already rejects requests when no public
key is cached. Add the same check to atmel_ecdh_compute_shared_secret()
to prevent the device from using a private key that was not generated
for the current tfm.

Fixes: 11105693fa ("crypto: atmel-ecc - introduce Microchip / Atmel ECC driver")
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Thorsten Blum 2026-06-11 23:36:17 +02:00 • committed by Herbert Xu

parent f964df8a12

commit f240f9b588

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drivers/crypto/atmel-ecc.c

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