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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-02 18:49:21 +1100
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:16:29 +1100
commit7ba683a6deba70251756aa5a021cdaa5c875a7a2 (patch)
tree80f63039b56bef0287fdf878163a5fe109821e58 /crypto/aead.c
parente29bc6ad0e84e3157e0f49130a15b278cb232c72 (diff)
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[CRYPTO] aead: Make authsize a run-time parameter
As it is authsize is an algorithm paramter which cannot be changed at run-time. This is inconvenient because hardware that implements such algorithms would have to register each authsize that they support separately. Since authsize is a property common to all AEAD algorithms, we can add a function setauthsize that sets it at run-time, just like setkey. This patch does exactly that and also changes authenc so that authsize is no longer a parameter of its template. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/aead.c')
-rw-r--r--crypto/aead.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/crypto/aead.c b/crypto/aead.c
index 84a3501fb478..f23c2b0ee009 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -53,6 +53,24 @@ static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
return aead->setkey(tfm, key, keylen);
}
+int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
+{
+ int err;
+
+ if (authsize > crypto_aead_alg(tfm)->maxauthsize)
+ return -EINVAL;
+
+ if (crypto_aead_alg(tfm)->setauthsize) {
+ err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
+ if (err)
+ return err;
+ }
+
+ crypto_aead_crt(tfm)->authsize = authsize;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
+
static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
u32 mask)
{
@@ -64,14 +82,14 @@ static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
struct aead_tfm *crt = &tfm->crt_aead;
- if (max(alg->authsize, alg->ivsize) > PAGE_SIZE / 8)
+ if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
return -EINVAL;
crt->setkey = setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
crt->ivsize = alg->ivsize;
- crt->authsize = alg->authsize;
+ crt->authsize = alg->maxauthsize;
return 0;
}
@@ -85,7 +103,7 @@ static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
seq_printf(m, "type : aead\n");
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
seq_printf(m, "ivsize : %u\n", aead->ivsize);
- seq_printf(m, "authsize : %u\n", aead->authsize);
+ seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
}
const struct crypto_type crypto_aead_type = {