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-rw-r--r--hash.h41
1 files changed, 40 insertions, 1 deletions
diff --git a/hash.h b/hash.h
index 7c8238b..adde708 100644
--- a/hash.h
+++ b/hash.h
@@ -15,6 +15,14 @@
#include "block-sha1/sha1.h"
#endif
+#if defined(SHA256_GCRYPT)
+#include "sha256/gcrypt.h"
+#elif defined(SHA256_OPENSSL)
+#include <openssl/sha.h>
+#else
+#include "sha256/block/sha256.h"
+#endif
+
#ifndef platform_SHA_CTX
/*
* platform's underlying implementation of SHA-1; could be OpenSSL,
@@ -34,6 +42,18 @@
#define git_SHA1_Update platform_SHA1_Update
#define git_SHA1_Final platform_SHA1_Final
+#ifndef platform_SHA256_CTX
+#define platform_SHA256_CTX SHA256_CTX
+#define platform_SHA256_Init SHA256_Init
+#define platform_SHA256_Update SHA256_Update
+#define platform_SHA256_Final SHA256_Final
+#endif
+
+#define git_SHA256_CTX platform_SHA256_CTX
+#define git_SHA256_Init platform_SHA256_Init
+#define git_SHA256_Update platform_SHA256_Update
+#define git_SHA256_Final platform_SHA256_Final
+
#ifdef SHA1_MAX_BLOCK_SIZE
#include "compat/sha1-chunked.h"
#undef git_SHA1_Update
@@ -52,12 +72,15 @@
#define GIT_HASH_UNKNOWN 0
/* SHA-1 */
#define GIT_HASH_SHA1 1
+/* SHA-256 */
+#define GIT_HASH_SHA256 2
/* Number of algorithms supported (including unknown). */
-#define GIT_HASH_NALGOS (GIT_HASH_SHA1 + 1)
+#define GIT_HASH_NALGOS (GIT_HASH_SHA256 + 1)
/* A suitably aligned type for stack allocations of hash contexts. */
union git_hash_ctx {
git_SHA_CTX sha1;
+ git_SHA256_CTX sha256;
};
typedef union git_hash_ctx git_hash_ctx;
@@ -81,6 +104,9 @@ struct git_hash_algo {
/* The length of the hash in hex characters. */
size_t hexsz;
+ /* The block size of the hash. */
+ size_t blksz;
+
/* The hash initialization function. */
git_hash_init_fn init_fn;
@@ -98,4 +124,17 @@ struct git_hash_algo {
};
extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS];
+/*
+ * Return a GIT_HASH_* constant based on the name. Returns GIT_HASH_UNKNOWN if
+ * the name doesn't match a known algorithm.
+ */
+int hash_algo_by_name(const char *name);
+/* Identical, except based on the format ID. */
+int hash_algo_by_id(uint32_t format_id);
+/* Identical, except for a pointer to struct git_hash_algo. */
+static inline int hash_algo_by_ptr(const struct git_hash_algo *p)
+{
+ return p - hash_algos;
+}
+
#endif