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 <[email protected]>

Author: hodgesds

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];