@@ -153,17 +153,55 @@ void __hmac_sha256_init(struct __hmac_sha256_ctx *ctx,
  */
 struct sha224_ctx {
 	struct __sha256_ctx ctx;
 };
 
+/**
+ * sha224_init() - Initialize a SHA-224 context for a new message
+ * @ctx: the context to initialize
+ *
+ * If you don't need incremental computation, consider sha224() instead.
+ *
+ * Context: Any context.
+ */
 void sha224_init(struct sha224_ctx *ctx);
+
+/**
+ * sha224_update() - Update a SHA-224 context with message data
+ * @ctx: the context to update; must have been initialized
+ * @data: the message data
+ * @len: the data length in bytes
+ *
+ * This can be called any number of times.
+ *
+ * Context: Any context.
+ */
 static inline void sha224_update(struct sha224_ctx *ctx,
 				 const u8 *data, size_t len)
 {
 	__sha256_update(&ctx->ctx, data, len);
 }
+
+/**
+ * sha224_final() - Finish computing a SHA-224 message digest
+ * @ctx: the context to finalize; must have been initialized
+ * @out: (output) the resulting SHA-224 message digest
+ *
+ * After finishing, this zeroizes @ctx.  So the caller does not need to do it.
+ *
+ * Context: Any context.
+ */
 void sha224_final(struct sha224_ctx *ctx, u8 out[SHA224_DIGEST_SIZE]);
+
+/**
+ * sha224() - Compute SHA-224 message digest in one shot
+ * @data: the message data
+ * @len: the data length in bytes
+ * @out: (output) the resulting SHA-224 message digest
+ *
+ * Context: Any context.
+ */
 void sha224(const u8 *data, size_t len, u8 out[SHA224_DIGEST_SIZE]);
 
 /**
  * struct hmac_sha224_key - Prepared key for HMAC-SHA224
  * @key: private

@@ -273,17 +311,55 @@ void hmac_sha224_usingrawkey(const u8 *raw_key, size_t raw_key_len,
  */
 struct sha256_ctx {
 	struct __sha256_ctx ctx;
 };
 
+/**
+ * sha256_init() - Initialize a SHA-256 context for a new message
+ * @ctx: the context to initialize
+ *
+ * If you don't need incremental computation, consider sha256() instead.
+ *
+ * Context: Any context.
+ */
 void sha256_init(struct sha256_ctx *ctx);
+
+/**
+ * sha256_update() - Update a SHA-256 context with message data
+ * @ctx: the context to update; must have been initialized
+ * @data: the message data
+ * @len: the data length in bytes
+ *
+ * This can be called any number of times.
+ *
+ * Context: Any context.
+ */
 static inline void sha256_update(struct sha256_ctx *ctx,
 				 const u8 *data, size_t len)
 {
 	__sha256_update(&ctx->ctx, data, len);
 }
+
+/**
+ * sha256_final() - Finish computing a SHA-256 message digest
+ * @ctx: the context to finalize; must have been initialized
+ * @out: (output) the resulting SHA-256 message digest
+ *
+ * After finishing, this zeroizes @ctx.  So the caller does not need to do it.
+ *
+ * Context: Any context.
+ */
 void sha256_final(struct sha256_ctx *ctx, u8 out[SHA256_DIGEST_SIZE]);
+
+/**
+ * sha256() - Compute SHA-256 message digest in one shot
+ * @data: the message data
+ * @len: the data length in bytes
+ * @out: (output) the resulting SHA-256 message digest
+ *
+ * Context: Any context.
+ */
 void sha256(const u8 *data, size_t len, u8 out[SHA256_DIGEST_SIZE]);
 
 /**
  * struct hmac_sha256_key - Prepared key for HMAC-SHA256
  * @key: private