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That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: berrange@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" We verified that the data block is properly sized modulo AES_BLOCK_SIZE within qcrypto_builtin_cipher_{en,de}crypt. Therefore we will never have to handle odd sized blocks. Signed-off-by: Richard Henderson Reviewed-by: Daniel P. Berrang=C3=A9 --- crypto/cipher-builtin.inc.c | 40 +++++++++++-------------------------- 1 file changed, 12 insertions(+), 28 deletions(-) diff --git a/crypto/cipher-builtin.inc.c b/crypto/cipher-builtin.inc.c index 1444139f36..e2ae5d090c 100644 --- a/crypto/cipher-builtin.inc.c +++ b/crypto/cipher-builtin.inc.c @@ -80,21 +80,13 @@ static void qcrypto_cipher_aes_ecb_encrypt(const AES_KE= Y *key, { const uint8_t *inptr =3D in; uint8_t *outptr =3D out; + + /* We have already verified that len % AES_BLOCK_SIZE =3D=3D 0. */ while (len) { - if (len > AES_BLOCK_SIZE) { - AES_encrypt(inptr, outptr, key); - inptr +=3D AES_BLOCK_SIZE; - outptr +=3D AES_BLOCK_SIZE; - len -=3D AES_BLOCK_SIZE; - } else { - uint8_t tmp1[AES_BLOCK_SIZE], tmp2[AES_BLOCK_SIZE]; - memcpy(tmp1, inptr, len); - /* Fill with 0 to avoid valgrind uninitialized reads */ - memset(tmp1 + len, 0, sizeof(tmp1) - len); - AES_encrypt(tmp1, tmp2, key); - memcpy(outptr, tmp2, len); - len =3D 0; - } + AES_encrypt(inptr, outptr, key); + inptr +=3D AES_BLOCK_SIZE; + outptr +=3D AES_BLOCK_SIZE; + len -=3D AES_BLOCK_SIZE; } } =20 @@ -106,21 +98,13 @@ static void qcrypto_cipher_aes_ecb_decrypt(const AES_K= EY *key, { const uint8_t *inptr =3D in; uint8_t *outptr =3D out; + + /* We have already verified that len % AES_BLOCK_SIZE =3D=3D 0. */ while (len) { - if (len > AES_BLOCK_SIZE) { - AES_decrypt(inptr, outptr, key); - inptr +=3D AES_BLOCK_SIZE; - outptr +=3D AES_BLOCK_SIZE; - len -=3D AES_BLOCK_SIZE; - } else { - uint8_t tmp1[AES_BLOCK_SIZE], tmp2[AES_BLOCK_SIZE]; - memcpy(tmp1, inptr, len); - /* Fill with 0 to avoid valgrind uninitialized reads */ - memset(tmp1 + len, 0, sizeof(tmp1) - len); - AES_decrypt(tmp1, tmp2, key); - memcpy(outptr, tmp2, len); - len =3D 0; - } + AES_decrypt(inptr, outptr, key); + inptr +=3D AES_BLOCK_SIZE; + outptr +=3D AES_BLOCK_SIZE; + len -=3D AES_BLOCK_SIZE; } } =20 --=20 2.25.1