linux-kernel - [PATCH bpf-next v5 1/7] bpf: Extend bpf_crypto

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Message-ID: <20260120184701.23082-2-git@danielhodges.dev>
Date: Tue, 20 Jan 2026 13:46:55 -0500
From: Daniel Hodges <git@...ielhodges.dev>
To: bpf@...r.kernel.org
Cc: Alexei Starovoitov <ast@...nel.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
	Song Liu <song@...nel.org>,
	Mykyta Yatsenko <yatsenko@...a.com>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Yonghong Song <yonghong.song@...ux.dev>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S . Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Daniel Hodges <git@...ielhodges.dev>
Subject: [PATCH bpf-next v5 1/7] bpf: Extend bpf_crypto_type with hash operations

Add hash operation callbacks to bpf_crypto_type structure:
 - hash(): Performs hashing operation on input data
 - digestsize(): Returns the output size for the hash algorithm

These additions enable BPF programs to use cryptographic hash functions
through the unified bpf_crypto_type interface, supporting use cases such
as content verification, integrity checking, and data authentication.

Signed-off-by: Daniel Hodges <git@...ielhodges.dev>
---
 include/linux/bpf_crypto.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/bpf_crypto.h b/include/linux/bpf_crypto.h
index a41e71d4e2d9..c84371cc4e47 100644
--- a/include/linux/bpf_crypto.h
+++ b/include/linux/bpf_crypto.h
@@ -11,8 +11,10 @@ struct bpf_crypto_type {
 	int (*setauthsize)(void *tfm, unsigned int authsize);
 	int (*encrypt)(void *tfm, const u8 *src, u8 *dst, unsigned int len, u8 *iv);
 	int (*decrypt)(void *tfm, const u8 *src, u8 *dst, unsigned int len, u8 *iv);
+	int (*hash)(void *tfm, const u8 *data, u8 *out, unsigned int len);
 	unsigned int (*ivsize)(void *tfm);
 	unsigned int (*statesize)(void *tfm);
+	unsigned int (*digestsize)(void *tfm);
 	u32 (*get_flags)(void *tfm);
 	struct module *owner;
 	char name[14];
-- 
2.52.0