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Add error message when sha256 algorithm is not supported

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It failed silently when crypto_alloc_tfm() failed, so add an error
message to inform the developer to enable sha256 algorithm support.

Signed-off-by: Yu Chien Peter Lin <peterlin.tw@pm.me>
This commit is contained in:
Peter Lin 2022-12-12 22:55:06 +08:00
parent d249317c87
commit 3133ee5293
2 changed files with 6 additions and 1 deletions
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6
examples/cryptosha256.c
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@ -26,8 +26,12 @@ static int cryptosha256_init(void)
struct shash_desc *shash;
sha256 = crypto_alloc_shash("sha256", 0, 0);
if (IS_ERR(sha256))
if (IS_ERR(sha256)) {
pr_err(
"%s(): Failed to allocate sha256 algorithm, enable CONFIG_CRYPTO_SHA256 and try again.\n",
__func__);
return -1;
}
shash = kmalloc(sizeof(struct shash_desc) + crypto_shash_descsize(sha256),
GFP_KERNEL);

1
lkmpg.tex
View File

@ -1891,6 +1891,7 @@ To handle crypto stuff, the kernel has its own API enabling common methods of en
Calculating and checking the hashes of things is a common operation.
Here is a demonstration of how to calculate a sha256 hash within a kernel module.
To provide the sha256 algorithm support, make sure \cpp|CONFIG_CRYPTO_SHA256| is enabled in kernel.
\samplec{examples/cryptosha256.c}