Add SHA-256 checksum calculation support

include/aaruformat/context.h

@@ -24,6 +24,7 @@
 #include "lru.h"
 #include "md5.h"
 #include "sha1.h"
+#include "sha256.h"
 #include "structs.h"
 #include "utarray.h"
 
@@ -212,12 +213,14 @@ typedef struct aaruformatContext
     hash_map_t *sectorHashMap;  ///< Deduplication hash map (fingerprint->entry mapping).
     bool        deduplicate;    ///< Storage deduplication active (duplicates coalesce).
 
-    bool     rewinded;            ///< True if stream has been rewound after open (write path).
-    uint64_t last_written_block;  ///< Last written block number (write path).
-    bool     calculating_md5;     ///< True if whole-image MD5 being calculated on-the-fly.
-    md5_ctx  md5_context;         ///< Opaque MD5 context for streaming updates
-    bool     calculating_sha1;    ///< True if whole-image SHA-1 being calculated on-the-fly.
-    sha1_ctx sha1_context;        ///< Opaque SHA-1 context for streaming updates
+    bool       rewinded;            ///< True if stream has been rewound after open (write path).
+    uint64_t   last_written_block;  ///< Last written block number (write path).
+    bool       calculating_md5;     ///< True if whole-image MD5 being calculated on-the-fly.
+    md5_ctx    md5_context;         ///< Opaque MD5 context for streaming updates
+    bool       calculating_sha1;    ///< True if whole-image SHA-1 being calculated on-the-fly.
+    sha1_ctx   sha1_context;        ///< Opaque SHA-1 context for streaming updates
+    bool       calculating_sha256;  ///< True if whole-image SHA-256 being calculated on-the-fly.
+    sha256_ctx sha256_context;      ///< Opaque SHA-256 context for streaming updates
 } aaruformatContext;
 
 /** \struct DumpHardwareEntriesWithData

include/aaruformat/decls.h

@@ -22,6 +22,7 @@
 #include "crc64.h"
 #include "md5.h"
 #include "sha1.h"
+#include "sha256.h"
 #include "simd.h"
 #include "spamsum.h"
 #ifdef __cplusplus
@@ -169,6 +170,11 @@ AARU_EXPORT void AARU_CALL aaruf_sha1_update(sha1_ctx *ctx, const void *data, un
 AARU_EXPORT void AARU_CALL aaruf_sha1_final(sha1_ctx *ctx, unsigned char *result);
 AARU_EXPORT void AARU_CALL aaruf_sha1_buffer(const void *data, unsigned long size, unsigned char *result);
 
+AARU_EXPORT void AARU_CALL aaruf_sha256_init(sha256_ctx *ctx);
+AARU_EXPORT void AARU_CALL aaruf_sha256_update(sha256_ctx *ctx, const void *data, unsigned long size);
+AARU_EXPORT void AARU_CALL aaruf_sha256_final(sha256_ctx *ctx, unsigned char *result);
+AARU_EXPORT void AARU_CALL aaruf_sha256_buffer(const void *data, unsigned long size, unsigned char *result);
+
 #if defined(__x86_64__) || defined(__amd64) || defined(_M_AMD64) || defined(_M_X64) || defined(__I386__) || \
     defined(__i386__) || defined(__THW_INTEL) || defined(_M_IX86)
 

include/sha256.h

@@ -0,0 +1,52 @@
+/*
+ * Public domain / MIT SHA-256 implementation for libaaruformat.
+ *
+ * This code is released into the public domain. If that is not recognized
+ * in your jurisdiction, you may instead treat it under the terms of the
+ * MIT license reproduced below.
+ *
+ * MIT License
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef LIBAARUFORMAT_SHA256_H
+#define LIBAARUFORMAT_SHA256_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#ifndef SHA256_DIGEST_LENGTH
+#define SHA256_DIGEST_LENGTH 32
+#endif
+
+    typedef struct
+    {
+        uint32_t state[8];
+        uint64_t bitcount; /* total bits processed */
+        uint8_t  buffer[64];
+    } sha256_ctx;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LIBAARUFORMAT_SHA256_H */