On 05/01/2026 17:37, Daniel Hodges wrote:
Add bpf_crypto_shash module that registers a hash type with the BPF
crypto infrastructure, enabling BPF programs to access kernel hash
algorithms through a unified interface.
Update the bpf_crypto_type interface with hash-specific callbacks:
- alloc_tfm: Allocates crypto_shash context with proper descriptor size
- free_tfm: Releases hash transform and context memory
- has_algo: Checks algorithm availability via crypto_has_shash()
- hash: Performs single-shot hashing via crypto_shash_digest()
- digestsize: Returns the output size for the hash algorithm
- get_flags: Exposes transform flags to BPF programs
Update bpf_shash_ctx to contain crypto_shash transform and shash_desc
descriptor to accommodate algorithm-specific descriptor requirements.
Signed-off-by: Daniel Hodges <[email protected]>
---
MAINTAINERS | 1 +
crypto/Makefile | 3 ++
crypto/bpf_crypto_shash.c | 95 +++++++++++++++++++++++++++++++++++++++
3 files changed, 99 insertions(+)
create mode 100644 crypto/bpf_crypto_shash.c
[...]
+static const struct bpf_crypto_type bpf_crypto_shash_type = {
+ .alloc_tfm = bpf_crypto_shash_alloc_tfm,
+ .free_tfm = bpf_crypto_shash_free_tfm,
+ .has_algo = bpf_crypto_shash_has_algo,
+ .hash = bpf_crypto_shash_hash,
I don't see a definition of hash() callback in struct bpf_crypto_type
+ .digestsize = bpf_crypto_shash_digestsize,
+ .get_flags = bpf_crypto_shash_get_flags,
+ .owner = THIS_MODULE,
+ .name = "hash",
+};
