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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>
alistair/sunxi64-5.4-dsi
Ard Biesheuvel 2019-07-02 21:41:30 +02:00 committed by Herbert Xu
parent aa6e2d2b35
commit c59a6dffa3
2 changed files with 7 additions and 13 deletions
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2
arch/arm64/crypto/Kconfig
View File

@ -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"

18
arch/arm64/crypto/aes-ce-ccm-glue.c
View File

@ -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;