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crypto: arm64/aes-ccm - switch to AES library

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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>
This commit is contained in:
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;