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diff --git a/drivers/staging/skein/threefish_api.h b/drivers/staging/skein/threefish_api.h
deleted file mode 100644
index 21539c3cc7a0..000000000000
--- a/drivers/staging/skein/threefish_api.h
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@@ -1,171 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-#ifndef THREEFISHAPI_H
-#define THREEFISHAPI_H
-
-/**
- * @file threefish_api.h
- * @brief A Threefish cipher API and its functions.
- * @{
- *
- * This API and the functions that implement this API simplify the usage
- * of the Threefish cipher. The design and the way to use the functions
- * follow the openSSL design but at the same time take care of some Threefish
- * specific behaviour and possibilities.
- *
- * These are the low level functions that deal with Threefish blocks only.
- * Implementations for cipher modes such as ECB, CFB, or CBC may use these
- * functions.
- *
-@code
-	// Threefish cipher context data
-	struct threefish_key key_ctx;
-
-	// Initialize the context
-	threefish_set_key(&key_ctx, THREEFISH_512, key, tweak);
-
-	// Encrypt
-	threefish_encrypt_block_bytes(&key_ctx, input, cipher);
-@endcode
- */
-
-#include <linux/types.h>
-#include "skein_base.h"
-
-#define KEY_SCHEDULE_CONST 0x1BD11BDAA9FC1A22L
-
-/**
- * Which Threefish size to use
- */
-enum threefish_size {
-	THREEFISH_256 = 256,     /*!< Skein with 256 bit state */
-	THREEFISH_512 = 512,     /*!< Skein with 512 bit state */
-	THREEFISH_1024 = 1024    /*!< Skein with 1024 bit state */
-};
-
-/**
- * Context for Threefish key and tweak words.
- *
- * This structure was setup with some know-how of the internal
- * Skein structures, in particular ordering of header and size dependent
- * variables. If Skein implementation changes this, the adapt these
- * structures as well.
- */
-struct threefish_key {
-	u64 state_size;
-	u64 key[SKEIN_MAX_STATE_WORDS + 1];   /* max number of key words*/
-	u64 tweak[3];
-};
-
-/**
- * Set Threefish key and tweak data.
- *
- * This function sets the key and tweak data for the Threefish cipher of
- * the given size. The key data must have the same length (number of bits)
- * as the state size
- *
- * @param key_ctx
- *     Pointer to a Threefish key structure.
- * @param size
- *     Which Skein size to use.
- * @param key_data
- *     Pointer to the key words (word has 64 bits).
- * @param tweak
- *     Pointer to the two tweak words (word has 64 bits).
- */
-void threefish_set_key(struct threefish_key *key_ctx,
-		       enum threefish_size state_size,
-		       u64 *key_data, u64 *tweak);
-
-/**
- * Encrypt Threefish block (bytes).
- *
- * The buffer must have at least the same length (number of bits) as the
- * state size for this key. The function uses the first @c state_size bits
- * of the input buffer, encrypts them and stores the result in the output
- * buffer.
- *
- * @param key_ctx
- *     Pointer to a Threefish key structure.
- * @param in
- *     Poionter to plaintext data buffer.
- * @param out
- *     Pointer to cipher buffer.
- */
-void threefish_encrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
-				   u8 *out);
-
-/**
- * Encrypt Threefish block (words).
- *
- * The buffer must have at least the same length (number of bits) as the
- * state size for this key. The function uses the first @c state_size bits
- * of the input buffer, encrypts them and stores the result in the output
- * buffer.
- *
- * The wordsize ist set to 64 bits.
- *
- * @param key_ctx
- *     Pointer to a Threefish key structure.
- * @param in
- *     Poionter to plaintext data buffer.
- * @param out
- *     Pointer to cipher buffer.
- */
-void threefish_encrypt_block_words(struct threefish_key *key_ctx, u64 *in,
-				   u64 *out);
-
-/**
- * Decrypt Threefish block (bytes).
- *
- * The buffer must have at least the same length (number of bits) as the
- * state size for this key. The function uses the first @c state_size bits
- * of the input buffer, decrypts them and stores the result in the output
- * buffer
- *
- * @param key_ctx
- *     Pointer to a Threefish key structure.
- * @param in
- *     Poionter to cipher data buffer.
- * @param out
- *     Pointer to plaintext buffer.
- */
-void threefish_decrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
-				   u8 *out);
-
-/**
- * Decrypt Threefish block (words).
- *
- * The buffer must have at least the same length (number of bits) as the
- * state size for this key. The function uses the first @c state_size bits
- * of the input buffer, encrypts them and stores the result in the output
- * buffer.
- *
- * The wordsize ist set to 64 bits.
- *
- * @param key_ctx
- *     Pointer to a Threefish key structure.
- * @param in
- *     Poionter to cipher data buffer.
- * @param out
- *     Pointer to plaintext buffer.
- */
-void threefish_decrypt_block_words(struct threefish_key *key_ctx, u64 *in,
-				   u64 *out);
-
-void threefish_encrypt_256(struct threefish_key *key_ctx, u64 *input,
-			   u64 *output);
-void threefish_encrypt_512(struct threefish_key *key_ctx, u64 *input,
-			   u64 *output);
-void threefish_encrypt_1024(struct threefish_key *key_ctx, u64 *input,
-			    u64 *output);
-void threefish_decrypt_256(struct threefish_key *key_ctx, u64 *input,
-			   u64 *output);
-void threefish_decrypt_512(struct threefish_key *key_ctx, u64 *input,
-			   u64 *output);
-void threefish_decrypt_1024(struct threefish_key *key_ctx, u64 *input,
-			    u64 *output);
-/**
- * @}
- */
-#endif