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-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 = {