diff --git a/arch/x86/crypto/blake2s-glue.c b/arch/x86/crypto/blake2s-glue.c
index 4dcb2ee89efc9..1306b3272c77f 100644
--- a/arch/x86/crypto/blake2s-glue.c
+++ b/arch/x86/crypto/blake2s-glue.c
@@ -58,75 +58,15 @@ void blake2s_compress_arch(struct blake2s_state *state,
 }
 EXPORT_SYMBOL(blake2s_compress_arch);
 
-static int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,
-				 unsigned int keylen)
+static int crypto_blake2s_update_x86(struct shash_desc *desc, const u8 *in,
+				     unsigned int inlen)
 {
-	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
-
-	if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE)
-		return -EINVAL;
-
-	memcpy(tctx->key, key, keylen);
-	tctx->keylen = keylen;
-
-	return 0;
-}
-
-static int crypto_blake2s_init(struct shash_desc *desc)
-{
-	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
-	struct blake2s_state *state = shash_desc_ctx(desc);
-	const int outlen = crypto_shash_digestsize(desc->tfm);
-
-	if (tctx->keylen)
-		blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
-	else
-		blake2s_init(state, outlen);
-
-	return 0;
-}
-
-static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
-				 unsigned int inlen)
-{
-	struct blake2s_state *state = shash_desc_ctx(desc);
-	const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
-
-	if (unlikely(!inlen))
-		return 0;
-	if (inlen > fill) {
-		memcpy(state->buf + state->buflen, in, fill);
-		blake2s_compress_arch(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
-		state->buflen = 0;
-		in += fill;
-		inlen -= fill;
-	}
-	if (inlen > BLAKE2S_BLOCK_SIZE) {
-		const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
-		/* Hash one less (full) block than strictly possible */
-		blake2s_compress_arch(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
-		in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
-		inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
-	}
-	memcpy(state->buf + state->buflen, in, inlen);
-	state->buflen += inlen;
-
-	return 0;
+	return crypto_blake2s_update(desc, in, inlen, blake2s_compress_arch);
 }
 
-static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
+static int crypto_blake2s_final_x86(struct shash_desc *desc, u8 *out)
 {
-	struct blake2s_state *state = shash_desc_ctx(desc);
-
-	blake2s_set_lastblock(state);
-	memset(state->buf + state->buflen, 0,
-	       BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
-	blake2s_compress_arch(state, state->buf, 1, state->buflen);
-	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
-	memcpy(out, state->h, state->outlen);
-	memzero_explicit(state, sizeof(*state));
-
-	return 0;
+	return crypto_blake2s_final(desc, out, blake2s_compress_arch);
 }
 
 #define BLAKE2S_ALG(name, driver_name, digest_size)			\
@@ -141,8 +81,8 @@ static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
 		.digestsize		= digest_size,			\
 		.setkey			= crypto_blake2s_setkey,	\
 		.init			= crypto_blake2s_init,		\
-		.update			= crypto_blake2s_update,	\
-		.final			= crypto_blake2s_final,		\
+		.update			= crypto_blake2s_update_x86,	\
+		.final			= crypto_blake2s_final_x86,	\
 		.descsize		= sizeof(struct blake2s_state),	\
 	}
 
diff --git a/crypto/Kconfig b/crypto/Kconfig
index a367fcfeb5d45..e3a51154ac0cf 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -681,6 +681,7 @@ config CRYPTO_BLAKE2B
 config CRYPTO_BLAKE2S
 	tristate "BLAKE2s digest algorithm"
 	select CRYPTO_LIB_BLAKE2S_GENERIC
+	select CRYPTO_BLAKE2S_HELPERS
 	select CRYPTO_HASH
 	help
 	  Implementation of cryptographic hash function BLAKE2s
@@ -696,11 +697,15 @@ config CRYPTO_BLAKE2S
 
 	  See https://blake2.net for further information.
 
+config CRYPTO_BLAKE2S_HELPERS
+	tristate
+
 config CRYPTO_BLAKE2S_X86
 	tristate "BLAKE2s digest algorithm (x86 accelerated version)"
 	depends on X86 && 64BIT
 	select CRYPTO_LIB_BLAKE2S_GENERIC
 	select CRYPTO_ARCH_HAVE_LIB_BLAKE2S
+	select CRYPTO_BLAKE2S_HELPERS if CRYPTO_HASH
 
 config CRYPTO_CRCT10DIF
 	tristate "CRCT10DIF algorithm"
diff --git a/crypto/Makefile b/crypto/Makefile
index b279483fba50b..75f99ab82bfc2 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -82,6 +82,7 @@ CFLAGS_wp512.o := $(call cc-option,-fno-schedule-insns)  # https://gcc.gnu.org/b
 obj-$(CONFIG_CRYPTO_TGR192) += tgr192.o
 obj-$(CONFIG_CRYPTO_BLAKE2B) += blake2b_generic.o
 obj-$(CONFIG_CRYPTO_BLAKE2S) += blake2s_generic.o
+obj-$(CONFIG_CRYPTO_BLAKE2S_HELPERS) += blake2s_helpers.o
 obj-$(CONFIG_CRYPTO_GF128MUL) += gf128mul.o
 obj-$(CONFIG_CRYPTO_ECB) += ecb.o
 obj-$(CONFIG_CRYPTO_CBC) += cbc.o
diff --git a/crypto/blake2s_generic.c b/crypto/blake2s_generic.c
index b89536c3671cf..ea2f1c6eb3231 100644
--- a/crypto/blake2s_generic.c
+++ b/crypto/blake2s_generic.c
@@ -1,84 +1,23 @@
 // SPDX-License-Identifier: GPL-2.0 OR MIT
 /*
+ * shash interface to the generic implementation of BLAKE2s
+ *
  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
  */
 
 #include <crypto/internal/blake2s.h>
 #include <crypto/internal/hash.h>
-
-#include <linux/types.h>
-#include <linux/kernel.h>
 #include <linux/module.h>
 
-static int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,
-				 unsigned int keylen)
-{
-	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
-
-	if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE)
-		return -EINVAL;
-
-	memcpy(tctx->key, key, keylen);
-	tctx->keylen = keylen;
-
-	return 0;
-}
-
-static int crypto_blake2s_init(struct shash_desc *desc)
-{
-	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
-	struct blake2s_state *state = shash_desc_ctx(desc);
-	const int outlen = crypto_shash_digestsize(desc->tfm);
-
-	if (tctx->keylen)
-		blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
-	else
-		blake2s_init(state, outlen);
-
-	return 0;
-}
-
-static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
-				 unsigned int inlen)
+static int crypto_blake2s_update_generic(struct shash_desc *desc,
+					 const u8 *in, unsigned int inlen)
 {
-	struct blake2s_state *state = shash_desc_ctx(desc);
-	const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
-
-	if (unlikely(!inlen))
-		return 0;
-	if (inlen > fill) {
-		memcpy(state->buf + state->buflen, in, fill);
-		blake2s_compress_generic(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
-		state->buflen = 0;
-		in += fill;
-		inlen -= fill;
-	}
-	if (inlen > BLAKE2S_BLOCK_SIZE) {
-		const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
-		/* Hash one less (full) block than strictly possible */
-		blake2s_compress_generic(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
-		in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
-		inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
-	}
-	memcpy(state->buf + state->buflen, in, inlen);
-	state->buflen += inlen;
-
-	return 0;
+	return crypto_blake2s_update(desc, in, inlen, blake2s_compress_generic);
 }
 
-static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
+static int crypto_blake2s_final_generic(struct shash_desc *desc, u8 *out)
 {
-	struct blake2s_state *state = shash_desc_ctx(desc);
-
-	blake2s_set_lastblock(state);
-	memset(state->buf + state->buflen, 0,
-	       BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
-	blake2s_compress_generic(state, state->buf, 1, state->buflen);
-	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
-	memcpy(out, state->h, state->outlen);
-	memzero_explicit(state, sizeof(*state));
-
-	return 0;
+	return crypto_blake2s_final(desc, out, blake2s_compress_generic);
 }
 
 #define BLAKE2S_ALG(name, driver_name, digest_size)			\
@@ -93,8 +32,8 @@ static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
 		.digestsize		= digest_size,			\
 		.setkey			= crypto_blake2s_setkey,	\
 		.init			= crypto_blake2s_init,		\
-		.update			= crypto_blake2s_update,	\
-		.final			= crypto_blake2s_final,		\
+		.update			= crypto_blake2s_update_generic, \
+		.final			= crypto_blake2s_final_generic,	\
 		.descsize		= sizeof(struct blake2s_state),	\
 	}
 
diff --git a/crypto/blake2s_helpers.c b/crypto/blake2s_helpers.c
new file mode 100644
index 0000000000000..0c3b9fcbd022c
--- /dev/null
+++ b/crypto/blake2s_helpers.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Helper functions for shash implementations of BLAKE2s.  The caller must
+ * provide a pointer to their blake2s_compress_t implementation.
+ *
+ * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#include <crypto/internal/blake2s.h>
+#include <crypto/internal/hash.h>
+#include <linux/export.h>
+
+int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,
+			  unsigned int keylen)
+{
+	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
+
+	if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE)
+		return -EINVAL;
+
+	memcpy(tctx->key, key, keylen);
+	tctx->keylen = keylen;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_blake2s_setkey);
+
+int crypto_blake2s_init(struct shash_desc *desc)
+{
+	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
+	struct blake2s_state *state = shash_desc_ctx(desc);
+	const int outlen = crypto_shash_digestsize(desc->tfm);
+
+	if (tctx->keylen)
+		blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
+	else
+		blake2s_init(state, outlen);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_blake2s_init);
+
+int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
+			  unsigned int inlen, blake2s_compress_t compress)
+{
+	struct blake2s_state *state = shash_desc_ctx(desc);
+	const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
+
+	if (unlikely(!inlen))
+		return 0;
+	if (inlen > fill) {
+		memcpy(state->buf + state->buflen, in, fill);
+		(*compress)(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
+		state->buflen = 0;
+		in += fill;
+		inlen -= fill;
+	}
+	if (inlen > BLAKE2S_BLOCK_SIZE) {
+		const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
+		/* Hash one less (full) block than strictly possible */
+		(*compress)(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
+		in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
+		inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
+	}
+	memcpy(state->buf + state->buflen, in, inlen);
+	state->buflen += inlen;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_blake2s_update);
+
+int crypto_blake2s_final(struct shash_desc *desc, u8 *out,
+			 blake2s_compress_t compress)
+{
+	struct blake2s_state *state = shash_desc_ctx(desc);
+
+	blake2s_set_lastblock(state);
+	memset(state->buf + state->buflen, 0,
+	       BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
+	(*compress)(state, state->buf, 1, state->buflen);
+	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
+	memcpy(out, state->h, state->outlen);
+	memzero_explicit(state, sizeof(*state));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_blake2s_final);
diff --git a/include/crypto/internal/blake2s.h b/include/crypto/internal/blake2s.h
index 6e376ae6b6b58..8c79af7662aa2 100644
--- a/include/crypto/internal/blake2s.h
+++ b/include/crypto/internal/blake2s.h
@@ -23,4 +23,21 @@ static inline void blake2s_set_lastblock(struct blake2s_state *state)
 	state->f[0] = -1;
 }
 
+typedef void (*blake2s_compress_t)(struct blake2s_state *state,
+				   const u8 *block, size_t nblocks, u32 inc);
+
+struct crypto_shash;
+struct shash_desc;
+
+int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,
+			  unsigned int keylen);
+
+int crypto_blake2s_init(struct shash_desc *desc);
+
+int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
+			  unsigned int inlen, blake2s_compress_t compress);
+
+int crypto_blake2s_final(struct shash_desc *desc, u8 *out,
+			 blake2s_compress_t compress);
+
 #endif /* BLAKE2S_INTERNAL_H */
