diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2019-07-02 21:41:30 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-07-26 14:56:05 +1000 |
| commit | c59a6dffa3cdf826cba92f1b967f8dba2fafec53 (patch) | |
| tree | 9617624ddbae3ab7535ef80ff07462d9c6907da2 | |
| parent | aa6e2d2b355f89e22c30b41d7e6653c8189235b8 (diff) | |
crypto: arm64/aes-ccm - switch to AES library
The CCM code calls directly into the scalar table based AES cipher for
arm64 from the fallback path, and since this implementation is known to
be non-time invariant, doing so from a time invariant SIMD cipher is a
bit nasty.
So let's switch to the AES library - this makes the code more robust,
and drops the dependency on the generic AES cipher, allowing us to
omit it entirely in the future.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | arch/arm64/crypto/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm64/crypto/aes-ce-ccm-glue.c | 18 |
2 files changed, 7 insertions, 13 deletions
diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig index 1762055e7093..c6032bfb44fb 100644 --- a/arch/arm64/crypto/Kconfig +++ b/arch/arm64/crypto/Kconfig @@ -80,8 +80,8 @@ config CRYPTO_AES_ARM64_CE_CCM depends on ARM64 && KERNEL_MODE_NEON select CRYPTO_ALGAPI select CRYPTO_AES_ARM64_CE - select CRYPTO_AES_ARM64 select CRYPTO_AEAD + select CRYPTO_LIB_AES config CRYPTO_AES_ARM64_CE_BLK tristate "AES in ECB/CBC/CTR/XTS modes using ARMv8 Crypto Extensions" diff --git a/arch/arm64/crypto/aes-ce-ccm-glue.c b/arch/arm64/crypto/aes-ce-ccm-glue.c index 827e5473e5de..541cf9165748 100644 --- a/arch/arm64/crypto/aes-ce-ccm-glue.c +++ b/arch/arm64/crypto/aes-ce-ccm-glue.c @@ -43,8 +43,6 @@ asmlinkage void ce_aes_ccm_decrypt(u8 out[], u8 const in[], u32 cbytes, asmlinkage void ce_aes_ccm_final(u8 mac[], u8 const ctr[], u32 const rk[], u32 rounds); -asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds); - static int ccm_setkey(struct crypto_aead *tfm, const u8 *in_key, unsigned int key_len) { @@ -124,8 +122,7 @@ static void ccm_update_mac(struct crypto_aes_ctx *key, u8 mac[], u8 const in[], } while (abytes >= AES_BLOCK_SIZE) { - __aes_arm64_encrypt(key->key_enc, mac, mac, - num_rounds(key)); + aes_encrypt(key, mac, mac); crypto_xor(mac, in, AES_BLOCK_SIZE); in += AES_BLOCK_SIZE; @@ -133,8 +130,7 @@ static void ccm_update_mac(struct crypto_aes_ctx *key, u8 mac[], u8 const in[], } if (abytes > 0) { - __aes_arm64_encrypt(key->key_enc, mac, mac, - num_rounds(key)); + aes_encrypt(key, mac, mac); crypto_xor(mac, in, abytes); *macp = abytes; } @@ -206,10 +202,8 @@ static int ccm_crypt_fallback(struct skcipher_walk *walk, u8 mac[], u8 iv0[], bsize = nbytes; crypto_inc(walk->iv, AES_BLOCK_SIZE); - __aes_arm64_encrypt(ctx->key_enc, buf, walk->iv, - num_rounds(ctx)); - __aes_arm64_encrypt(ctx->key_enc, mac, mac, - num_rounds(ctx)); + aes_encrypt(ctx, buf, walk->iv); + aes_encrypt(ctx, mac, mac); if (enc) crypto_xor(mac, src, bsize); crypto_xor_cpy(dst, src, buf, bsize); @@ -224,8 +218,8 @@ static int ccm_crypt_fallback(struct skcipher_walk *walk, u8 mac[], u8 iv0[], } if (!err) { - __aes_arm64_encrypt(ctx->key_enc, buf, iv0, num_rounds(ctx)); - __aes_arm64_encrypt(ctx->key_enc, mac, mac, num_rounds(ctx)); + aes_encrypt(ctx, buf, iv0); + aes_encrypt(ctx, mac, mac); crypto_xor(mac, buf, AES_BLOCK_SIZE); } return err; |