diff --git a/crypto/shash.c b/crypto/shash.c
index f23bd9cb1873..b6c79a4a044a 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -16,6 +16,24 @@
 
 #include "hash.h"
 
+static inline bool crypto_shash_block_only(struct crypto_shash *tfm)
+{
+	return crypto_shash_alg(tfm)->base.cra_flags &
+	       CRYPTO_AHASH_ALG_BLOCK_ONLY;
+}
+
+static inline bool crypto_shash_final_nonzero(struct crypto_shash *tfm)
+{
+	return crypto_shash_alg(tfm)->base.cra_flags &
+	       CRYPTO_AHASH_ALG_FINAL_NONZERO;
+}
+
+static inline bool crypto_shash_finup_max(struct crypto_shash *tfm)
+{
+	return crypto_shash_alg(tfm)->base.cra_flags &
+	       CRYPTO_AHASH_ALG_FINUP_MAX;
+}
+
 int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
 		    unsigned int keylen)
 {
@@ -46,18 +64,27 @@ int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
 }
 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
 
-int crypto_shash_update(struct shash_desc *desc, const u8 *data,
-			unsigned int len)
+static int __crypto_shash_init(struct shash_desc *desc)
 {
-	return crypto_shash_alg(desc->tfm)->update(desc, data, len);
-}
-EXPORT_SYMBOL_GPL(crypto_shash_update);
+	struct crypto_shash *tfm = desc->tfm;
 
-int crypto_shash_final(struct shash_desc *desc, u8 *out)
-{
-	return crypto_shash_alg(desc->tfm)->final(desc, out);
+	if (crypto_shash_block_only(tfm)) {
+		u8 *buf = shash_desc_ctx(desc);
+
+		buf += crypto_shash_descsize(tfm) - 1;
+		*buf = 0;
+	}
+
+	return crypto_shash_alg(tfm)->init(desc);
 }
-EXPORT_SYMBOL_GPL(crypto_shash_final);
+
+int crypto_shash_init(struct shash_desc *desc)
+{
+	if (crypto_shash_get_flags(desc->tfm) & CRYPTO_TFM_NEED_KEY)
+		return -ENOKEY;
+	return __crypto_shash_init(desc);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_init);
 
 static int shash_default_finup(struct shash_desc *desc, const u8 *data,
 			       unsigned int len, u8 *out)
@@ -68,20 +95,89 @@ static int shash_default_finup(struct shash_desc *desc, const u8 *data,
 	       shash->final(desc, out);
 }
 
-int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
-		       unsigned int len, u8 *out)
+static int crypto_shash_op_and_zero(
+	int (*op)(struct shash_desc *desc, const u8 *data,
+		  unsigned int len, u8 *out),
+	struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
 {
-	return crypto_shash_alg(desc->tfm)->finup(desc, data, len, out);
+	int err;
+
+	err = op(desc, data, len, out);
+	memset(shash_desc_ctx(desc), 0, crypto_shash_descsize(desc->tfm));
+	return err;
+}
+
+int crypto_shash_finup(struct shash_desc *restrict desc, const u8 *data,
+		       unsigned int len, u8 *restrict out)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	u8 *blenp = shash_desc_ctx(desc);
+	bool finup_max, nonzero;
+	unsigned int bs;
+	int err;
+	u8 *buf;
+
+	if (!crypto_shash_block_only(tfm)) {
+		if (out)
+			goto finup;
+		return crypto_shash_alg(tfm)->update(desc, data, len);
+	}
+
+	finup_max = out && crypto_shash_finup_max(tfm);
+
+	/* Retain extra block for final nonzero algorithms. */
+	nonzero = crypto_shash_final_nonzero(tfm);
+
+	/*
+	 * The partial block buffer follows the algorithm desc context.
+	 * The byte following that contains the length.
+	 */
+	blenp += crypto_shash_descsize(tfm) - 1;
+	bs = crypto_shash_blocksize(tfm);
+	buf = blenp - bs;
+
+	if (likely(!*blenp && finup_max))
+		goto finup;
+
+	while ((*blenp + len) >= bs + nonzero) {
+		unsigned int nbytes = len - nonzero;
+		const u8 *src = data;
+
+		if (*blenp) {
+			memcpy(buf + *blenp, data, bs - *blenp);
+			nbytes = bs;
+			src = buf;
+		}
+
+		err = crypto_shash_alg(tfm)->update(desc, src, nbytes);
+		if (err < 0)
+			return err;
+
+		data += nbytes - err - *blenp;
+		len -= nbytes - err - *blenp;
+		*blenp = 0;
+	}
+
+	if (*blenp || !out) {
+		memcpy(buf + *blenp, data, len);
+		*blenp += len;
+		if (!out)
+			return 0;
+		data = buf;
+		len = *blenp;
+	}
+
+finup:
+	return crypto_shash_op_and_zero(crypto_shash_alg(tfm)->finup, desc,
+					data, len, out);
 }
 EXPORT_SYMBOL_GPL(crypto_shash_finup);
 
 static int shash_default_digest(struct shash_desc *desc, const u8 *data,
 				unsigned int len, u8 *out)
 {
-	struct shash_alg *shash = crypto_shash_alg(desc->tfm);
-
-	return shash->init(desc) ?:
-	       shash->finup(desc, data, len, out);
+	return __crypto_shash_init(desc) ?:
+	       crypto_shash_finup(desc, data, len, out);
 }
 
 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
@@ -92,7 +188,8 @@ int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
 	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 		return -ENOKEY;
 
-	return crypto_shash_alg(tfm)->digest(desc, data, len, out);
+	return crypto_shash_op_and_zero(crypto_shash_alg(tfm)->digest, desc,
+					data, len, out);
 }
 EXPORT_SYMBOL_GPL(crypto_shash_digest);
 
@@ -100,44 +197,92 @@ int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
 			    unsigned int len, u8 *out)
 {
 	SHASH_DESC_ON_STACK(desc, tfm);
-	int err;
 
 	desc->tfm = tfm;
-
-	err = crypto_shash_digest(desc, data, len, out);
-
-	shash_desc_zero(desc);
-
-	return err;
+	return crypto_shash_digest(desc, data, len, out);
 }
 EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
 
+int crypto_shash_export_core(struct shash_desc *desc, void *out)
+{
+	int (*export)(struct shash_desc *desc, void *out);
+	struct crypto_shash *tfm = desc->tfm;
+	u8 *buf = shash_desc_ctx(desc);
+	unsigned int plen, ss;
+
+	plen = crypto_shash_blocksize(tfm) + 1;
+	ss = crypto_shash_statesize(tfm);
+	if (crypto_shash_block_only(tfm))
+		ss -= plen;
+	export = crypto_shash_alg(tfm)->export;
+	if (!export) {
+		memcpy(out, buf, ss);
+		return 0;
+	}
+
+	return export(desc, out);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_export_core);
+
 int crypto_shash_export(struct shash_desc *desc, void *out)
 {
 	struct crypto_shash *tfm = desc->tfm;
-	struct shash_alg *shash = crypto_shash_alg(tfm);
 
-	if (shash->export)
-		return shash->export(desc, out);
+	if (crypto_shash_block_only(tfm)) {
+		unsigned int plen = crypto_shash_blocksize(tfm) + 1;
+		unsigned int descsize = crypto_shash_descsize(tfm);
+		unsigned int ss = crypto_shash_statesize(tfm);
+		u8 *buf = shash_desc_ctx(desc);
 
-	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm));
-	return 0;
+		memcpy(out + ss - plen, buf + descsize - plen, plen);
+	}
+	return crypto_shash_export_core(desc, out);
 }
 EXPORT_SYMBOL_GPL(crypto_shash_export);
 
-int crypto_shash_import(struct shash_desc *desc, const void *in)
+int crypto_shash_import_core(struct shash_desc *desc, const void *in)
 {
+	int (*import)(struct shash_desc *desc, const void *in);
 	struct crypto_shash *tfm = desc->tfm;
-	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned int descsize, plen, ss;
+	u8 *buf = shash_desc_ctx(desc);
 
 	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 		return -ENOKEY;
 
-	if (shash->import)
-		return shash->import(desc, in);
+	plen = crypto_shash_blocksize(tfm) + 1;
+	descsize = crypto_shash_descsize(tfm);
+	ss = crypto_shash_statesize(tfm);
+	buf[descsize - 1] = 0;
+	if (crypto_shash_block_only(tfm))
+		ss -= plen;
+	import = crypto_shash_alg(tfm)->import;
+	if (!import) {
+		memcpy(buf, in, ss);
+		return 0;
+	}
 
-	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
-	return 0;
+	return import(desc, in);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_import_core);
+
+int crypto_shash_import(struct shash_desc *desc, const void *in)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	int err;
+
+	err = crypto_shash_import_core(desc, in);
+	if (crypto_shash_block_only(tfm)) {
+		unsigned int plen = crypto_shash_blocksize(tfm) + 1;
+		unsigned int descsize = crypto_shash_descsize(tfm);
+		unsigned int ss = crypto_shash_statesize(tfm);
+		u8 *buf = shash_desc_ctx(desc);
+
+		memcpy(buf + descsize - plen, in + ss - plen, plen);
+		if (buf[descsize - 1] >= plen)
+			err = -EOVERFLOW;
+	}
+	return err;
 }
 EXPORT_SYMBOL_GPL(crypto_shash_import);
 
@@ -293,9 +438,6 @@ static int shash_prepare_alg(struct shash_alg *alg)
 	struct crypto_alg *base = &alg->halg.base;
 	int err;
 
-	if (alg->descsize > HASH_MAX_DESCSIZE)
-		return -EINVAL;
-
 	if ((alg->export && !alg->import) || (alg->import && !alg->export))
 		return -EINVAL;
 
@@ -321,11 +463,20 @@ static int shash_prepare_alg(struct shash_alg *alg)
 		alg->finup = shash_default_finup;
 	if (!alg->digest)
 		alg->digest = shash_default_digest;
-	if (!alg->export)
+	if (!alg->export && !alg->halg.statesize)
 		alg->halg.statesize = alg->descsize;
 	if (!alg->setkey)
 		alg->setkey = shash_no_setkey;
 
+	if (base->cra_flags & CRYPTO_AHASH_ALG_BLOCK_ONLY) {
+		BUILD_BUG_ON(MAX_ALGAPI_BLOCKSIZE >= 256);
+		alg->descsize += base->cra_blocksize + 1;
+		alg->statesize += base->cra_blocksize + 1;
+	}
+
+	if (alg->descsize > HASH_MAX_DESCSIZE)
+		return -EINVAL;
+
 	return 0;
 }
 
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index 58ac1423dc38..5f87d1040a7c 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -85,6 +85,8 @@ struct ahash_request {
  *	   transformation object. Data processing can happen synchronously
  *	   [SHASH] or asynchronously [AHASH] at this point. Driver must not use
  *	   req->result.
+ *	   For block-only algorithms, @update must return the number
+ *	   of bytes to store in the API partial block buffer.
  * @final: **[mandatory]** Retrieve result from the driver. This function finalizes the
  *	   transformation and retrieves the resulting hash from the driver and
  *	   pushes it back to upper layers. No data processing happens at this
@@ -905,6 +907,18 @@ int crypto_hash_digest(struct crypto_ahash *tfm, const u8 *data,
  */
 int crypto_shash_export(struct shash_desc *desc, void *out);
 
+/**
+ * crypto_shash_export_core() - extract core state for message digest
+ * @desc: reference to the operational state handle whose state is exported
+ * @out: output buffer of sufficient size that can hold the hash state
+ *
+ * Export the hash state without the partial block buffer.
+ *
+ * Context: Softirq or process context.
+ * Return: 0 if the export creation was successful; < 0 if an error occurred
+ */
+int crypto_shash_export_core(struct shash_desc *desc, void *out);
+
 /**
  * crypto_shash_import() - import operational state
  * @desc: reference to the operational state handle the state imported into
@@ -919,6 +933,18 @@ int crypto_shash_export(struct shash_desc *desc, void *out);
  */
 int crypto_shash_import(struct shash_desc *desc, const void *in);
 
+/**
+ * crypto_shash_import_core() - import core state
+ * @desc: reference to the operational state handle the state imported into
+ * @in: buffer holding the state
+ *
+ * Import the hash state without the partial block buffer.
+ *
+ * Context: Softirq or process context.
+ * Return: 0 if the import was successful; < 0 if an error occurred
+ */
+int crypto_shash_import_core(struct shash_desc *desc, const void *in);
+
 /**
  * crypto_shash_init() - (re)initialize message digest
  * @desc: operational state handle that is already filled
@@ -931,46 +957,7 @@ int crypto_shash_import(struct shash_desc *desc, const void *in);
  * Return: 0 if the message digest initialization was successful; < 0 if an
  *	   error occurred
  */
-static inline int crypto_shash_init(struct shash_desc *desc)
-{
-	struct crypto_shash *tfm = desc->tfm;
-
-	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
-		return -ENOKEY;
-
-	return crypto_shash_alg(tfm)->init(desc);
-}
-
-/**
- * crypto_shash_update() - add data to message digest for processing
- * @desc: operational state handle that is already initialized
- * @data: input data to be added to the message digest
- * @len: length of the input data
- *
- * Updates the message digest state of the operational state handle.
- *
- * Context: Softirq or process context.
- * Return: 0 if the message digest update was successful; < 0 if an error
- *	   occurred
- */
-int crypto_shash_update(struct shash_desc *desc, const u8 *data,
-			unsigned int len);
-
-/**
- * crypto_shash_final() - calculate message digest
- * @desc: operational state handle that is already filled with data
- * @out: output buffer filled with the message digest
- *
- * Finalize the message digest operation and create the message digest
- * based on all data added to the cipher handle. The message digest is placed
- * into the output buffer. The caller must ensure that the output buffer is
- * large enough by using crypto_shash_digestsize.
- *
- * Context: Softirq or process context.
- * Return: 0 if the message digest creation was successful; < 0 if an error
- *	   occurred
- */
-int crypto_shash_final(struct shash_desc *desc, u8 *out);
+int crypto_shash_init(struct shash_desc *desc);
 
 /**
  * crypto_shash_finup() - calculate message digest of buffer
@@ -990,6 +977,43 @@ int crypto_shash_final(struct shash_desc *desc, u8 *out);
 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
 		       unsigned int len, u8 *out);
 
+/**
+ * crypto_shash_update() - add data to message digest for processing
+ * @desc: operational state handle that is already initialized
+ * @data: input data to be added to the message digest
+ * @len: length of the input data
+ *
+ * Updates the message digest state of the operational state handle.
+ *
+ * Context: Softirq or process context.
+ * Return: 0 if the message digest update was successful; < 0 if an error
+ *	   occurred
+ */
+static inline int crypto_shash_update(struct shash_desc *desc, const u8 *data,
+				      unsigned int len)
+{
+	return crypto_shash_finup(desc, data, len, NULL);
+}
+
+/**
+ * crypto_shash_final() - calculate message digest
+ * @desc: operational state handle that is already filled with data
+ * @out: output buffer filled with the message digest
+ *
+ * Finalize the message digest operation and create the message digest
+ * based on all data added to the cipher handle. The message digest is placed
+ * into the output buffer. The caller must ensure that the output buffer is
+ * large enough by using crypto_shash_digestsize.
+ *
+ * Context: Softirq or process context.
+ * Return: 0 if the message digest creation was successful; < 0 if an error
+ *	   occurred
+ */
+static inline int crypto_shash_final(struct shash_desc *desc, u8 *out)
+{
+	return crypto_shash_finup(desc, NULL, 0, out);
+}
+
 static inline void shash_desc_zero(struct shash_desc *desc)
 {
 	memzero_explicit(desc,
diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index 45c728ac2621..1e80dd084a23 100644
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -11,6 +11,15 @@
 #include <crypto/algapi.h>
 #include <crypto/hash.h>
 
+/* Set this bit to handle partial blocks in the API. */
+#define CRYPTO_AHASH_ALG_BLOCK_ONLY	0x01000000
+
+/* Set this bit if final requires at least one byte. */
+#define CRYPTO_AHASH_ALG_FINAL_NONZERO	0x02000000
+
+/* Set this bit if finup can deal with multiple blocks. */
+#define CRYPTO_AHASH_ALG_FINUP_MAX	0x04000000
+
 #define HASH_FBREQ_ON_STACK(name, req) \
         char __##name##_req[sizeof(struct ahash_request) + \
                             MAX_SYNC_HASH_REQSIZE] CRYPTO_MINALIGN_ATTR; \
@@ -281,5 +290,11 @@ static inline struct ahash_request *ahash_fbreq_on_stack_init(
 	return req;
 }
 
+/* Return the state size without partial block for block-only algorithms. */
+static inline unsigned int crypto_shash_coresize(struct crypto_shash *tfm)
+{
+	return crypto_shash_statesize(tfm) - crypto_shash_blocksize(tfm) - 1;
+}
+
 #endif	/* _CRYPTO_INTERNAL_HASH_H */
 
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index b89b1b348095..f691ce01745e 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -136,6 +136,8 @@
 /* Set if the algorithm supports request chains and virtual addresses. */
 #define CRYPTO_ALG_REQ_CHAIN		0x00040000
 
+/* The high bits 0xff000000 are reserved for type-specific flags. */
+
 /*
  * Transform masks and values (for crt_flags).
  */