From: Sven Schwermer sven@svenschwermer.de
[ Upstream commit caa9dbb76ff52ec848a57245062aaeaa07740adc ]
While MXS_DCP_CONTROL0_OTP_KEY is set, the CRYPTO_KEY (DCP_PAES_KEY_OTP) is used even if the UNIQUE_KEY (DCP_PAES_KEY_UNIQUE) is selected. This is not clearly documented, but this implementation is consistent with NXP's downstream kernel fork and optee_os.
Signed-off-by: Sven Schwermer sven@svenschwermer.de Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/crypto/mxs-dcp.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/crypto/mxs-dcp.c b/drivers/crypto/mxs-dcp.c index d94a26c3541a0..133ebc9982362 100644 --- a/drivers/crypto/mxs-dcp.c +++ b/drivers/crypto/mxs-dcp.c @@ -265,12 +265,12 @@ static int mxs_dcp_run_aes(struct dcp_async_ctx *actx, MXS_DCP_CONTROL0_INTERRUPT | MXS_DCP_CONTROL0_ENABLE_CIPHER;
- if (key_referenced) - /* Set OTP key bit to select the key via KEY_SELECT. */ - desc->control0 |= MXS_DCP_CONTROL0_OTP_KEY; - else + if (!key_referenced) /* Payload contains the key. */ desc->control0 |= MXS_DCP_CONTROL0_PAYLOAD_KEY; + else if (actx->key[0] == DCP_PAES_KEY_OTP) + /* Set OTP key bit to select the key via KEY_SELECT. */ + desc->control0 |= MXS_DCP_CONTROL0_OTP_KEY;
if (rctx->enc) desc->control0 |= MXS_DCP_CONTROL0_CIPHER_ENCRYPT;