power: Rename CONFIG_PMIC_... to CONFIG_POWER_...

[karo-tx-uboot.git] / include / hash.h

diff --git a/include/hash.h b/include/hash.h
index 88fa2b5a577b7c641057c178cedc6f7cdb17246a..dc21678045e8df71eb30fbb01d72a28c8c92e17e 100644 (file)
--- a/include/hash.h
+++ b/include/hash.h
@@ -1,28 +1,12 @@
 /*
  * Copyright (c) 2012 The Chromium OS Authors.
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:    GPL-2.0+
  */
 
 #ifndef _HASH_H
 #define _HASH_H
 
-#ifdef CONFIG_SHA1SUM_VERIFY
+#if defined(CONFIG_SHA1SUM_VERIFY) || defined(CONFIG_CRC32_VERIFY)
 #define CONFIG_HASH_VERIFY
 #endif
 
@@ -43,6 +27,42 @@ struct hash_algo {
        void (*hash_func_ws)(const unsigned char *input, unsigned int ilen,
                unsigned char *output, unsigned int chunk_sz);
        int chunk_size;                         /* Watchdog chunk size */
+       /*
+        * hash_init: Create the context for progressive hashing
+        *
+        * @algo: Pointer to the hash_algo struct
+        * @ctxp: Pointer to the pointer of the context for hashing
+        * @return 0 if ok, -1 on error
+        */
+       int (*hash_init)(struct hash_algo *algo, void **ctxp);
+       /*
+        * hash_update: Perform hashing on the given buffer
+        *
+        * The context is freed by this function if an error occurs.
+        *
+        * @algo: Pointer to the hash_algo struct
+        * @ctx: Pointer to the context for hashing
+        * @buf: Pointer to the buffer being hashed
+        * @size: Size of the buffer being hashed
+        * @is_last: 1 if this is the last update; 0 otherwise
+        * @return 0 if ok, -1 on error
+        */
+       int (*hash_update)(struct hash_algo *algo, void *ctx, const void *buf,
+                          unsigned int size, int is_last);
+       /*
+        * hash_finish: Write the hash result to the given buffer
+        *
+        * The context is freed by this function.
+        *
+        * @algo: Pointer to the hash_algo struct
+        * @ctx: Pointer to the context for hashing
+        * @dest_buf: Pointer to the buffer for the result
+        * @size: Size of the buffer for the result
+        * @return 0 if ok, -ENOSPC if size of the result buffer is too small
+        *   or -1 on other errors
+        */
+       int (*hash_finish)(struct hash_algo *algo, void *ctx, void *dest_buf,
+                          int size);
 };
 
 /*
@@ -61,7 +81,7 @@ enum {
  *
  * This common function is used to implement specific hash commands.
  *
- * @algo_name:         Hash algorithm being used
+ * @algo_name:         Hash algorithm being used (lower case!)
  * @flags:             Flags value (HASH_FLAG_...)
  * @cmdtp:             Pointer to command table entry
  * @flag:              Some flags normally 0 (see CMD_FLAG_.. above)
@@ -71,4 +91,38 @@ enum {
 int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
                 int argc, char * const argv[]);
 
+/**
+ * hash_block() - Hash a block according to the requested algorithm
+ *
+ * The caller probably knows the hash length for the chosen algorithm, but
+ * in order to provide a general interface, and output_size parameter is
+ * provided.
+ *
+ * @algo_name:         Hash algorithm to use
+ * @data:              Data to hash
+ * @len:               Lengh of data to hash in bytes
+ * @output:            Place to put hash value
+ * @output_size:       On entry, pointer to the number of bytes available in
+ *                     output. On exit, pointer to the number of bytes used.
+ *                     If NULL, then it is assumed that the caller has
+ *                     allocated enough space for the hash. This is possible
+ *                     since the caller is selecting the algorithm.
+ * @return 0 if ok, -ve on error: -EPROTONOSUPPORT for an unknown algorithm,
+ * -ENOSPC if the output buffer is not large enough.
+ */
+int hash_block(const char *algo_name, const void *data, unsigned int len,
+              uint8_t *output, int *output_size);
+
+/**
+ * hash_lookup_algo() - Look up the hash_algo struct for an algorithm
+ *
+ * The function returns the pointer to the struct or -EPROTONOSUPPORT if the
+ * algorithm is not available.
+ *
+ * @algo_name: Hash algorithm to look up
+ * @algop: Pointer to the hash_algo struct if found
+ *
+ * @return 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
+ */
+int hash_lookup_algo(const char *algo_name, struct hash_algo **algop);
 #endif