diff --git a/hash.h b/hash.h
index 42b52c6dae..4367acfec5 100644
--- a/hash.h
+++ b/hash.h
@@ -235,6 +235,7 @@ enum get_oid_result {
 
 /* A suitably aligned type for stack allocations of hash contexts. */
 struct git_hash_ctx {
+	const struct git_hash_algo *algop;
 	union {
 		git_SHA_CTX sha1;
 		git_SHA_CTX_unsafe sha1_unsafe;
@@ -296,6 +297,26 @@ struct git_hash_algo {
 };
 extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS];
 
+static inline void git_hash_clone(struct git_hash_ctx *dst, const struct git_hash_ctx *src)
+{
+	src->algop->clone_fn(dst, src);
+}
+
+static inline void git_hash_update(struct git_hash_ctx *ctx, const void *in, size_t len)
+{
+	ctx->algop->update_fn(ctx, in, len);
+}
+
+static inline void git_hash_final(unsigned char *hash, struct git_hash_ctx *ctx)
+{
+	ctx->algop->final_fn(hash, ctx);
+}
+
+static inline void git_hash_final_oid(struct object_id *oid, struct git_hash_ctx *ctx)
+{
+	ctx->algop->final_oid_fn(oid, ctx);
+}
+
 /*
  * Return a GIT_HASH_* constant based on the name.  Returns GIT_HASH_UNKNOWN if
  * the name doesn't match a known algorithm.
diff --git a/object-file.c b/object-file.c
index 154bcfce78..b7f2af515f 100644
--- a/object-file.c
+++ b/object-file.c
@@ -88,11 +88,13 @@ static const struct object_id null_oid_sha256 = {
 
 static void git_hash_sha1_init(struct git_hash_ctx *ctx)
 {
+	ctx->algop = &hash_algos[GIT_HASH_SHA1];
 	git_SHA1_Init(&ctx->state.sha1);
 }
 
 static void git_hash_sha1_clone(struct git_hash_ctx *dst, const struct git_hash_ctx *src)
 {
+	dst->algop = src->algop;
 	git_SHA1_Clone(&dst->state.sha1, &src->state.sha1);
 }
 
@@ -115,11 +117,13 @@ static void git_hash_sha1_final_oid(struct object_id *oid, struct git_hash_ctx *
 
 static void git_hash_sha1_init_unsafe(struct git_hash_ctx *ctx)
 {
+	ctx->algop = unsafe_hash_algo(&hash_algos[GIT_HASH_SHA1]);
 	git_SHA1_Init_unsafe(&ctx->state.sha1_unsafe);
 }
 
 static void git_hash_sha1_clone_unsafe(struct git_hash_ctx *dst, const struct git_hash_ctx *src)
 {
+	dst->algop = src->algop;
 	git_SHA1_Clone_unsafe(&dst->state.sha1_unsafe, &src->state.sha1_unsafe);
 }
 
@@ -143,11 +147,13 @@ static void git_hash_sha1_final_oid_unsafe(struct object_id *oid, struct git_has
 
 static void git_hash_sha256_init(struct git_hash_ctx *ctx)
 {
+	ctx->algop = unsafe_hash_algo(&hash_algos[GIT_HASH_SHA256]);
 	git_SHA256_Init(&ctx->state.sha256);
 }
 
 static void git_hash_sha256_clone(struct git_hash_ctx *dst, const struct git_hash_ctx *src)
 {
+	dst->algop = src->algop;
 	git_SHA256_Clone(&dst->state.sha256, &src->state.sha256);
 }