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authorEric Biggers <ebiggers@google.com>2018-11-17 02:26:21 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2018-11-20 07:26:55 +0100
commit1ca1b917940c24ca3d1f490118c5474168622953 (patch)
tree26cde5a85d0792a8dd709a6f5316f76af8801a35 /drivers/crypto/caam/caamalg_qi2.c
parentcrypto: chacha20-generic - add XChaCha20 support (diff)
downloadlinux-1ca1b917940c24ca3d1f490118c5474168622953.tar.xz
linux-1ca1b917940c24ca3d1f490118c5474168622953.zip
crypto: chacha20-generic - refactor to allow varying number of rounds
In preparation for adding XChaCha12 support, rename/refactor chacha20-generic to support different numbers of rounds. The justification for needing XChaCha12 support is explained in more detail in the patch "crypto: chacha - add XChaCha12 support". The only difference between ChaCha{8,12,20} are the number of rounds itself; all other parts of the algorithm are the same. Therefore, remove the "20" from all definitions, structures, functions, files, etc. that will be shared by all ChaCha versions. Also make ->setkey() store the round count in the chacha_ctx (previously chacha20_ctx). The generic code then passes the round count through to chacha_block(). There will be a ->setkey() function for each explicitly allowed round count; the encrypt/decrypt functions will be the same. I decided not to do it the opposite way (same ->setkey() function for all round counts, with different encrypt/decrypt functions) because that would have required more boilerplate code in architecture-specific implementations of ChaCha and XChaCha. Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Martin Willi <martin@strongswan.org> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/caam/caamalg_qi2.c')
-rw-r--r--drivers/crypto/caam/caamalg_qi2.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/crypto/caam/caamalg_qi2.c b/drivers/crypto/caam/caamalg_qi2.c
index 2598640aa98b..425d5d974613 100644
--- a/drivers/crypto/caam/caamalg_qi2.c
+++ b/drivers/crypto/caam/caamalg_qi2.c
@@ -591,7 +591,7 @@ static int chachapoly_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int ivsize = crypto_aead_ivsize(aead);
unsigned int saltlen = CHACHAPOLY_IV_SIZE - ivsize;
- if (keylen != CHACHA20_KEY_SIZE + saltlen) {
+ if (keylen != CHACHA_KEY_SIZE + saltlen) {
crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
@@ -1577,9 +1577,9 @@ static struct caam_skcipher_alg driver_algs[] = {
.setkey = skcipher_setkey,
.encrypt = skcipher_encrypt,
.decrypt = skcipher_decrypt,
- .min_keysize = CHACHA20_KEY_SIZE,
- .max_keysize = CHACHA20_KEY_SIZE,
- .ivsize = CHACHA20_IV_SIZE,
+ .min_keysize = CHACHA_KEY_SIZE,
+ .max_keysize = CHACHA_KEY_SIZE,
+ .ivsize = CHACHA_IV_SIZE,
},
.caam.class1_alg_type = OP_ALG_ALGSEL_CHACHA20,
},