fs/verity/hash_algs.c

3  * fs-verity hash algorithms
10 #include <crypto/hash.h>
12 /* The hash algorithms supported by fs-verity */
31  * fsverity_get_hash_alg() - validate and prepare a hash algorithm
33  * @num: the hash algorithm number
35  * Get the struct fsverity_hash_alg for the given hash algorithm number, and
36  * ensure it has a hash transform ready to go.  The hash transforms are
40  * Return: pointer to the hash alg on success, else an ERR_PTR()
51 		fsverity_warn(inode, "Unknown hash algorithm number: %u", num);  in fsverity_get_hash_alg()
69 				      "Missing crypto API support for hash algorithm \"%s\"",  in fsverity_get_hash_alg()
75 			     "Error allocating hash algorithm \"%s\": %ld",  in fsverity_get_hash_alg()
103  * fsverity_prepare_hash_state() - precompute the initial hash state
104  * @alg: hash algorithm
109  *	   initial hash state on success or an ERR_PTR() on failure.
130 	 * Zero-pad the salt to the next multiple of the input size of the hash  in fsverity_prepare_hash_state()
132 	 * bytes for SHA-512.  This ensures that the hash algorithm won't have  in fsverity_prepare_hash_state()
165  * fsverity_hash_block() - hash a single data or hash block
168  * @data: virtual address of a buffer containing the block to hash
171  * Hash a single data or hash block.  The hash is salted if a salt is specified
188 				     "Error %d importing hash state", err);  in fsverity_hash_block()
196 		fsverity_err(inode, "Error %d computing block hash", err);  in fsverity_hash_block()
201  * fsverity_hash_buffer() - hash some data
202  * @alg: the hash algorithm to use
203  * @data: the data to hash
204  * @size: size of data to hash, in bytes
220 	 * Sanity check the hash algorithms (could be a build-time check, but  in fsverity_check_hash_algs()