diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 9c252a8..8eee6d7 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -64,6 +64,7 @@
     psa_crypto_client.c
     psa_crypto_driver_wrappers.c
     psa_crypto_ecp.c
+    psa_crypto_hash.c
     psa_crypto_rsa.c
     psa_crypto_se.c
     psa_crypto_slot_management.c
diff --git a/library/Makefile b/library/Makefile
index 903dc0d..8c69671 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -121,6 +121,7 @@
 	     psa_crypto_client.o \
 	     psa_crypto_driver_wrappers.o \
 	     psa_crypto_ecp.o \
+	     psa_crypto_hash.o \
 	     psa_crypto_rsa.o \
 	     psa_crypto_se.o \
 	     psa_crypto_slot_management.o \
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 6225272..84cf32d 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -33,6 +33,7 @@
 #include "psa_crypto_invasive.h"
 #include "psa_crypto_driver_wrappers.h"
 #include "psa_crypto_ecp.h"
+#include "psa_crypto_hash.h"
 #include "psa_crypto_rsa.h"
 #include "psa_crypto_ecp.h"
 #if defined(MBEDTLS_PSA_CRYPTO_SE_C)
@@ -2196,219 +2197,58 @@
 
 psa_status_t psa_hash_abort( psa_hash_operation_t *operation )
 {
-    switch( operation->alg )
+    if( operation != NULL )
     {
-        case 0:
-            /* The object has (apparently) been initialized but it is not
-             * in use. It's ok to call abort on such an object, and there's
-             * nothing to do. */
-            break;
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
-        case PSA_ALG_MD2:
-            mbedtls_md2_free( &operation->ctx.md2 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
-        case PSA_ALG_MD4:
-            mbedtls_md4_free( &operation->ctx.md4 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
-        case PSA_ALG_MD5:
-            mbedtls_md5_free( &operation->ctx.md5 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
-        case PSA_ALG_RIPEMD160:
-            mbedtls_ripemd160_free( &operation->ctx.ripemd160 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
-        case PSA_ALG_SHA_1:
-            mbedtls_sha1_free( &operation->ctx.sha1 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
-        case PSA_ALG_SHA_224:
-            mbedtls_sha256_free( &operation->ctx.sha256 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
-        case PSA_ALG_SHA_256:
-            mbedtls_sha256_free( &operation->ctx.sha256 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
-        case PSA_ALG_SHA_384:
-            mbedtls_sha512_free( &operation->ctx.sha512 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
-        case PSA_ALG_SHA_512:
-            mbedtls_sha512_free( &operation->ctx.sha512 );
-            break;
-#endif
-        default:
-            return( PSA_ERROR_BAD_STATE );
+        if( operation->ctx.ctx != NULL )
+        {
+            psa_status_t status = mbedtls_psa_hash_abort( operation->ctx.ctx );
+            mbedtls_free( operation->ctx.ctx );
+            operation->ctx.ctx = NULL;
+            return( status );
+        }
+        else
+        {
+            // Multiple consequent calls to abort return success
+            return( PSA_SUCCESS );
+        }
     }
-    operation->alg = 0;
-    return( PSA_SUCCESS );
+    else
+        return( PSA_ERROR_INVALID_ARGUMENT );
 }
 
 psa_status_t psa_hash_setup( psa_hash_operation_t *operation,
                              psa_algorithm_t alg )
 {
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
+
+    if( operation == NULL || !PSA_ALG_IS_HASH( alg ) )
+        return( PSA_ERROR_INVALID_ARGUMENT );
 
     /* A context must be freshly initialized before it can be set up. */
-    if( operation->alg != 0 )
-    {
+    if( operation->ctx.ctx != NULL )
         return( PSA_ERROR_BAD_STATE );
-    }
 
-    switch( alg )
-    {
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
-        case PSA_ALG_MD2:
-            mbedtls_md2_init( &operation->ctx.md2 );
-            ret = mbedtls_md2_starts_ret( &operation->ctx.md2 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
-        case PSA_ALG_MD4:
-            mbedtls_md4_init( &operation->ctx.md4 );
-            ret = mbedtls_md4_starts_ret( &operation->ctx.md4 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
-        case PSA_ALG_MD5:
-            mbedtls_md5_init( &operation->ctx.md5 );
-            ret = mbedtls_md5_starts_ret( &operation->ctx.md5 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
-        case PSA_ALG_RIPEMD160:
-            mbedtls_ripemd160_init( &operation->ctx.ripemd160 );
-            ret = mbedtls_ripemd160_starts_ret( &operation->ctx.ripemd160 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
-        case PSA_ALG_SHA_1:
-            mbedtls_sha1_init( &operation->ctx.sha1 );
-            ret = mbedtls_sha1_starts_ret( &operation->ctx.sha1 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
-        case PSA_ALG_SHA_224:
-            mbedtls_sha256_init( &operation->ctx.sha256 );
-            ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 1 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
-        case PSA_ALG_SHA_256:
-            mbedtls_sha256_init( &operation->ctx.sha256 );
-            ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 0 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
-        case PSA_ALG_SHA_384:
-            mbedtls_sha512_init( &operation->ctx.sha512 );
-            ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 1 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
-        case PSA_ALG_SHA_512:
-            mbedtls_sha512_init( &operation->ctx.sha512 );
-            ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 0 );
-            break;
-#endif
-        default:
-            return( PSA_ALG_IS_HASH( alg ) ?
-                    PSA_ERROR_NOT_SUPPORTED :
-                    PSA_ERROR_INVALID_ARGUMENT );
-    }
-    if( ret == 0 )
-        operation->alg = alg;
-    else
+    operation->ctx.ctx = mbedtls_calloc( 1, sizeof(mbedtls_psa_hash_operation_t) );
+    status = mbedtls_psa_hash_setup( operation->ctx.ctx, alg );
+    if( status != PSA_SUCCESS )
         psa_hash_abort( operation );
-    return( mbedtls_to_psa_error( ret ) );
+    return( status );
 }
 
 psa_status_t psa_hash_update( psa_hash_operation_t *operation,
                               const uint8_t *input,
                               size_t input_length )
 {
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    if( operation == NULL )
+        return( PSA_ERROR_INVALID_ARGUMENT );
+    if( operation->ctx.ctx == NULL )
+        return( PSA_ERROR_BAD_STATE );
 
-    /* Don't require hash implementations to behave correctly on a
-     * zero-length input, which may have an invalid pointer. */
-    if( input_length == 0 )
-        return( PSA_SUCCESS );
-
-    switch( operation->alg )
-    {
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
-        case PSA_ALG_MD2:
-            ret = mbedtls_md2_update_ret( &operation->ctx.md2,
-                                          input, input_length );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
-        case PSA_ALG_MD4:
-            ret = mbedtls_md4_update_ret( &operation->ctx.md4,
-                                          input, input_length );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
-        case PSA_ALG_MD5:
-            ret = mbedtls_md5_update_ret( &operation->ctx.md5,
-                                          input, input_length );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
-        case PSA_ALG_RIPEMD160:
-            ret = mbedtls_ripemd160_update_ret( &operation->ctx.ripemd160,
-                                                input, input_length );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
-        case PSA_ALG_SHA_1:
-            ret = mbedtls_sha1_update_ret( &operation->ctx.sha1,
-                                           input, input_length );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
-        case PSA_ALG_SHA_224:
-            ret = mbedtls_sha256_update_ret( &operation->ctx.sha256,
-                                             input, input_length );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
-        case PSA_ALG_SHA_256:
-            ret = mbedtls_sha256_update_ret( &operation->ctx.sha256,
-                                             input, input_length );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
-        case PSA_ALG_SHA_384:
-            ret = mbedtls_sha512_update_ret( &operation->ctx.sha512,
-                                             input, input_length );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
-        case PSA_ALG_SHA_512:
-            ret = mbedtls_sha512_update_ret( &operation->ctx.sha512,
-                                             input, input_length );
-            break;
-#endif
-        default:
-            (void)input;
-            return( PSA_ERROR_BAD_STATE );
-    }
-
-    if( ret != 0 )
+    psa_status_t status = mbedtls_psa_hash_update( operation->ctx.ctx,
+                                                   input, input_length );
+    if( status != PSA_SUCCESS )
         psa_hash_abort( operation );
-    return( mbedtls_to_psa_error( ret ) );
+    return( status );
 }
 
 psa_status_t psa_hash_finish( psa_hash_operation_t *operation,
@@ -2416,88 +2256,15 @@
                               size_t hash_size,
                               size_t *hash_length )
 {
-    psa_status_t status;
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    size_t actual_hash_length = PSA_HASH_LENGTH( operation->alg );
+    if( operation == NULL )
+        return( PSA_ERROR_INVALID_ARGUMENT );
+    if( operation->ctx.ctx == NULL )
+        return( PSA_ERROR_BAD_STATE );
 
-    /* Fill the output buffer with something that isn't a valid hash
-     * (barring an attack on the hash and deliberately-crafted input),
-     * in case the caller doesn't check the return status properly. */
-    *hash_length = hash_size;
-    /* If hash_size is 0 then hash may be NULL and then the
-     * call to memset would have undefined behavior. */
-    if( hash_size != 0 )
-        memset( hash, '!', hash_size );
-
-    if( hash_size < actual_hash_length )
-    {
-        status = PSA_ERROR_BUFFER_TOO_SMALL;
-        goto exit;
-    }
-
-    switch( operation->alg )
-    {
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
-        case PSA_ALG_MD2:
-            ret = mbedtls_md2_finish_ret( &operation->ctx.md2, hash );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
-        case PSA_ALG_MD4:
-            ret = mbedtls_md4_finish_ret( &operation->ctx.md4, hash );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
-        case PSA_ALG_MD5:
-            ret = mbedtls_md5_finish_ret( &operation->ctx.md5, hash );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
-        case PSA_ALG_RIPEMD160:
-            ret = mbedtls_ripemd160_finish_ret( &operation->ctx.ripemd160, hash );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
-        case PSA_ALG_SHA_1:
-            ret = mbedtls_sha1_finish_ret( &operation->ctx.sha1, hash );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
-        case PSA_ALG_SHA_224:
-            ret = mbedtls_sha256_finish_ret( &operation->ctx.sha256, hash );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
-        case PSA_ALG_SHA_256:
-            ret = mbedtls_sha256_finish_ret( &operation->ctx.sha256, hash );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
-        case PSA_ALG_SHA_384:
-            ret = mbedtls_sha512_finish_ret( &operation->ctx.sha512, hash );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
-        case PSA_ALG_SHA_512:
-            ret = mbedtls_sha512_finish_ret( &operation->ctx.sha512, hash );
-            break;
-#endif
-        default:
-            return( PSA_ERROR_BAD_STATE );
-    }
-    status = mbedtls_to_psa_error( ret );
-
-exit:
-    if( status == PSA_SUCCESS )
-    {
-        *hash_length = actual_hash_length;
-        return( psa_hash_abort( operation ) );
-    }
-    else
-    {
-        psa_hash_abort( operation );
-        return( status );
-    }
+    psa_status_t status = mbedtls_psa_hash_finish( operation->ctx.ctx,
+                                                   hash, hash_size, hash_length );
+    psa_hash_abort( operation );
+    return( status );
 }
 
 psa_status_t psa_hash_verify( psa_hash_operation_t *operation,
@@ -2523,26 +2290,8 @@
                                uint8_t *hash, size_t hash_size,
                                size_t *hash_length )
 {
-    psa_hash_operation_t operation = PSA_HASH_OPERATION_INIT;
-    psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
-
-    *hash_length = hash_size;
-    status = psa_hash_setup( &operation, alg );
-    if( status != PSA_SUCCESS )
-        goto exit;
-    status = psa_hash_update( &operation, input, input_length );
-    if( status != PSA_SUCCESS )
-        goto exit;
-    status = psa_hash_finish( &operation, hash, hash_size, hash_length );
-    if( status != PSA_SUCCESS )
-        goto exit;
-
-exit:
-    if( status == PSA_SUCCESS )
-        status = psa_hash_abort( &operation );
-    else
-        psa_hash_abort( &operation );
-    return( status );
+    return( mbedtls_psa_hash_compute( alg, input, input_length,
+                                      hash, hash_size, hash_length ) );
 }
 
 psa_status_t psa_hash_compare( psa_algorithm_t alg,
@@ -2573,73 +2322,15 @@
 psa_status_t psa_hash_clone( const psa_hash_operation_t *source_operation,
                              psa_hash_operation_t *target_operation )
 {
-    if( target_operation->alg != 0 )
+    if( source_operation == NULL || target_operation == NULL )
+        return( PSA_ERROR_INVALID_ARGUMENT );
+    if( source_operation->ctx.ctx == NULL )
+        return( PSA_ERROR_BAD_STATE );
+    if( target_operation->ctx.ctx != NULL )
         return( PSA_ERROR_BAD_STATE );
 
-    switch( source_operation->alg )
-    {
-        case 0:
-            return( PSA_ERROR_BAD_STATE );
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
-        case PSA_ALG_MD2:
-            mbedtls_md2_clone( &target_operation->ctx.md2,
-                               &source_operation->ctx.md2 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
-        case PSA_ALG_MD4:
-            mbedtls_md4_clone( &target_operation->ctx.md4,
-                               &source_operation->ctx.md4 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
-        case PSA_ALG_MD5:
-            mbedtls_md5_clone( &target_operation->ctx.md5,
-                               &source_operation->ctx.md5 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
-        case PSA_ALG_RIPEMD160:
-            mbedtls_ripemd160_clone( &target_operation->ctx.ripemd160,
-                                     &source_operation->ctx.ripemd160 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
-        case PSA_ALG_SHA_1:
-            mbedtls_sha1_clone( &target_operation->ctx.sha1,
-                                &source_operation->ctx.sha1 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
-        case PSA_ALG_SHA_224:
-            mbedtls_sha256_clone( &target_operation->ctx.sha256,
-                                  &source_operation->ctx.sha256 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
-        case PSA_ALG_SHA_256:
-            mbedtls_sha256_clone( &target_operation->ctx.sha256,
-                                  &source_operation->ctx.sha256 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
-        case PSA_ALG_SHA_384:
-            mbedtls_sha512_clone( &target_operation->ctx.sha512,
-                                  &source_operation->ctx.sha512 );
-            break;
-#endif
-#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
-        case PSA_ALG_SHA_512:
-            mbedtls_sha512_clone( &target_operation->ctx.sha512,
-                                  &source_operation->ctx.sha512 );
-            break;
-#endif
-        default:
-            return( PSA_ERROR_NOT_SUPPORTED );
-    }
-
-    target_operation->alg = source_operation->alg;
-    return( PSA_SUCCESS );
+    target_operation->ctx.ctx = mbedtls_calloc(1, sizeof(mbedtls_psa_hash_operation_t));
+    return( mbedtls_psa_hash_clone( source_operation->ctx.ctx, target_operation->ctx.ctx ) );
 }
 
 
@@ -2795,7 +2486,7 @@
     if( PSA_ALG_IS_HMAC( operation->alg ) )
     {
         /* We'll set up the hash operation later in psa_hmac_setup_internal. */
-        operation->ctx.hmac.hash_ctx.alg = 0;
+        operation->ctx.hmac.alg = 0;
         status = PSA_SUCCESS;
     }
     else
@@ -2902,6 +2593,8 @@
     size_t block_size = psa_get_hash_block_size( hash_alg );
     psa_status_t status;
 
+    hmac->alg = hash_alg;
+
     /* Sanity checks on block_size, to guarantee that there won't be a buffer
      * overflow below. This should never trigger if the hash algorithm
      * is implemented correctly. */
@@ -3119,7 +2812,7 @@
                                               size_t mac_size )
 {
     uint8_t tmp[MBEDTLS_MD_MAX_SIZE];
-    psa_algorithm_t hash_alg = hmac->hash_ctx.alg;
+    psa_algorithm_t hash_alg = hmac->alg;
     size_t hash_size = 0;
     size_t block_size = psa_get_hash_block_size( hash_alg );
     psa_status_t status;
diff --git a/library/psa_crypto_hash.c b/library/psa_crypto_hash.c
new file mode 100644
index 0000000..deb13c2
--- /dev/null
+++ b/library/psa_crypto_hash.c
@@ -0,0 +1,442 @@
+/*
+ *  PSA hashing layer on top of Mbed TLS software crypto
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include "common.h"
+
+#if defined(MBEDTLS_PSA_CRYPTO_C)
+
+#include <psa/crypto.h>
+#include "psa_crypto_core.h"
+#include "psa_crypto_hash.h"
+
+#include <mbedtls/error.h>
+#include <string.h>
+
+psa_status_t mbedtls_psa_hash_compute(
+    psa_algorithm_t alg,
+    const uint8_t *input,
+    size_t input_length,
+    uint8_t *hash,
+    size_t hash_size,
+    size_t *hash_length)
+{
+    mbedtls_psa_hash_operation_t operation = MBEDTLS_PSA_HASH_OPERATION_INIT;
+    psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
+
+    *hash_length = hash_size;
+    status = mbedtls_psa_hash_setup( &operation, alg );
+    if( status != PSA_SUCCESS )
+        goto exit;
+    status = mbedtls_psa_hash_update( &operation, input, input_length );
+    if( status != PSA_SUCCESS )
+        goto exit;
+    status = mbedtls_psa_hash_finish( &operation, hash, hash_size, hash_length );
+    if( status != PSA_SUCCESS )
+        goto exit;
+
+exit:
+    if( status == PSA_SUCCESS )
+        status = mbedtls_psa_hash_abort( &operation );
+    else
+        mbedtls_psa_hash_abort( &operation );
+    return( status );
+}
+
+psa_status_t mbedtls_psa_hash_setup(
+    mbedtls_psa_hash_operation_t *operation,
+    psa_algorithm_t alg )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+    /* A context must be freshly initialized before it can be set up. */
+    if( operation->alg != 0 )
+    {
+        return( PSA_ERROR_BAD_STATE );
+    }
+
+    switch( alg )
+    {
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
+        case PSA_ALG_MD2:
+            mbedtls_md2_init( &operation->ctx.md2 );
+            ret = mbedtls_md2_starts_ret( &operation->ctx.md2 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
+        case PSA_ALG_MD4:
+            mbedtls_md4_init( &operation->ctx.md4 );
+            ret = mbedtls_md4_starts_ret( &operation->ctx.md4 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
+        case PSA_ALG_MD5:
+            mbedtls_md5_init( &operation->ctx.md5 );
+            ret = mbedtls_md5_starts_ret( &operation->ctx.md5 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
+        case PSA_ALG_RIPEMD160:
+            mbedtls_ripemd160_init( &operation->ctx.ripemd160 );
+            ret = mbedtls_ripemd160_starts_ret( &operation->ctx.ripemd160 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
+        case PSA_ALG_SHA_1:
+            mbedtls_sha1_init( &operation->ctx.sha1 );
+            ret = mbedtls_sha1_starts_ret( &operation->ctx.sha1 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
+        case PSA_ALG_SHA_224:
+            mbedtls_sha256_init( &operation->ctx.sha256 );
+            ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 1 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
+        case PSA_ALG_SHA_256:
+            mbedtls_sha256_init( &operation->ctx.sha256 );
+            ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 0 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
+        case PSA_ALG_SHA_384:
+            mbedtls_sha512_init( &operation->ctx.sha512 );
+            ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 1 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
+        case PSA_ALG_SHA_512:
+            mbedtls_sha512_init( &operation->ctx.sha512 );
+            ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 0 );
+            break;
+#endif
+        default:
+            return( PSA_ALG_IS_HASH( alg ) ?
+                    PSA_ERROR_NOT_SUPPORTED :
+                    PSA_ERROR_INVALID_ARGUMENT );
+    }
+    if( ret == 0 )
+        operation->alg = alg;
+    else
+        mbedtls_psa_hash_abort( operation );
+    return( mbedtls_to_psa_error( ret ) );
+}
+
+psa_status_t mbedtls_psa_hash_clone(
+    const mbedtls_psa_hash_operation_t *source_operation,
+    mbedtls_psa_hash_operation_t *target_operation )
+{
+    switch( source_operation->alg )
+    {
+        case 0:
+            return( PSA_ERROR_BAD_STATE );
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
+        case PSA_ALG_MD2:
+            mbedtls_md2_clone( &target_operation->ctx.md2,
+                               &source_operation->ctx.md2 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
+        case PSA_ALG_MD4:
+            mbedtls_md4_clone( &target_operation->ctx.md4,
+                               &source_operation->ctx.md4 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
+        case PSA_ALG_MD5:
+            mbedtls_md5_clone( &target_operation->ctx.md5,
+                               &source_operation->ctx.md5 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
+        case PSA_ALG_RIPEMD160:
+            mbedtls_ripemd160_clone( &target_operation->ctx.ripemd160,
+                                     &source_operation->ctx.ripemd160 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
+        case PSA_ALG_SHA_1:
+            mbedtls_sha1_clone( &target_operation->ctx.sha1,
+                                &source_operation->ctx.sha1 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
+        case PSA_ALG_SHA_224:
+            mbedtls_sha256_clone( &target_operation->ctx.sha256,
+                                  &source_operation->ctx.sha256 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
+        case PSA_ALG_SHA_256:
+            mbedtls_sha256_clone( &target_operation->ctx.sha256,
+                                  &source_operation->ctx.sha256 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
+        case PSA_ALG_SHA_384:
+            mbedtls_sha512_clone( &target_operation->ctx.sha512,
+                                  &source_operation->ctx.sha512 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
+        case PSA_ALG_SHA_512:
+            mbedtls_sha512_clone( &target_operation->ctx.sha512,
+                                  &source_operation->ctx.sha512 );
+            break;
+#endif
+        default:
+            return( PSA_ERROR_NOT_SUPPORTED );
+    }
+
+    target_operation->alg = source_operation->alg;
+    return( PSA_SUCCESS );
+}
+
+psa_status_t mbedtls_psa_hash_update(
+    mbedtls_psa_hash_operation_t *operation,
+    const uint8_t *input,
+    size_t input_length )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+    /* Don't require hash implementations to behave correctly on a
+     * zero-length input, which may have an invalid pointer. */
+    if( input_length == 0 )
+        return( PSA_SUCCESS );
+
+    switch( operation->alg )
+    {
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
+        case PSA_ALG_MD2:
+            ret = mbedtls_md2_update_ret( &operation->ctx.md2,
+                                          input, input_length );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
+        case PSA_ALG_MD4:
+            ret = mbedtls_md4_update_ret( &operation->ctx.md4,
+                                          input, input_length );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
+        case PSA_ALG_MD5:
+            ret = mbedtls_md5_update_ret( &operation->ctx.md5,
+                                          input, input_length );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
+        case PSA_ALG_RIPEMD160:
+            ret = mbedtls_ripemd160_update_ret( &operation->ctx.ripemd160,
+                                                input, input_length );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
+        case PSA_ALG_SHA_1:
+            ret = mbedtls_sha1_update_ret( &operation->ctx.sha1,
+                                           input, input_length );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
+        case PSA_ALG_SHA_224:
+            ret = mbedtls_sha256_update_ret( &operation->ctx.sha256,
+                                             input, input_length );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
+        case PSA_ALG_SHA_256:
+            ret = mbedtls_sha256_update_ret( &operation->ctx.sha256,
+                                             input, input_length );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
+        case PSA_ALG_SHA_384:
+            ret = mbedtls_sha512_update_ret( &operation->ctx.sha512,
+                                             input, input_length );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
+        case PSA_ALG_SHA_512:
+            ret = mbedtls_sha512_update_ret( &operation->ctx.sha512,
+                                             input, input_length );
+            break;
+#endif
+        default:
+            (void)input;
+            return( PSA_ERROR_BAD_STATE );
+    }
+
+    if( ret != 0 )
+        mbedtls_psa_hash_abort( operation );
+    return( mbedtls_to_psa_error( ret ) );
+}
+
+psa_status_t mbedtls_psa_hash_finish(
+    mbedtls_psa_hash_operation_t *operation,
+    uint8_t *hash,
+    size_t hash_size,
+    size_t *hash_length )
+{
+    psa_status_t status;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    size_t actual_hash_length = PSA_HASH_LENGTH( operation->alg );
+
+    /* Fill the output buffer with something that isn't a valid hash
+     * (barring an attack on the hash and deliberately-crafted input),
+     * in case the caller doesn't check the return status properly. */
+    *hash_length = hash_size;
+    /* If hash_size is 0 then hash may be NULL and then the
+     * call to memset would have undefined behavior. */
+    if( hash_size != 0 )
+        memset( hash, '!', hash_size );
+
+    if( hash_size < actual_hash_length )
+    {
+        status = PSA_ERROR_BUFFER_TOO_SMALL;
+        goto exit;
+    }
+
+    switch( operation->alg )
+    {
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
+        case PSA_ALG_MD2:
+            ret = mbedtls_md2_finish_ret( &operation->ctx.md2, hash );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
+        case PSA_ALG_MD4:
+            ret = mbedtls_md4_finish_ret( &operation->ctx.md4, hash );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
+        case PSA_ALG_MD5:
+            ret = mbedtls_md5_finish_ret( &operation->ctx.md5, hash );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
+        case PSA_ALG_RIPEMD160:
+            ret = mbedtls_ripemd160_finish_ret( &operation->ctx.ripemd160, hash );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
+        case PSA_ALG_SHA_1:
+            ret = mbedtls_sha1_finish_ret( &operation->ctx.sha1, hash );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
+        case PSA_ALG_SHA_224:
+            ret = mbedtls_sha256_finish_ret( &operation->ctx.sha256, hash );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
+        case PSA_ALG_SHA_256:
+            ret = mbedtls_sha256_finish_ret( &operation->ctx.sha256, hash );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
+        case PSA_ALG_SHA_384:
+            ret = mbedtls_sha512_finish_ret( &operation->ctx.sha512, hash );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
+        case PSA_ALG_SHA_512:
+            ret = mbedtls_sha512_finish_ret( &operation->ctx.sha512, hash );
+            break;
+#endif
+        default:
+            return( PSA_ERROR_BAD_STATE );
+    }
+    status = mbedtls_to_psa_error( ret );
+
+exit:
+    if( status == PSA_SUCCESS )
+    {
+        *hash_length = actual_hash_length;
+        return( mbedtls_psa_hash_abort( operation ) );
+    }
+    else
+    {
+        mbedtls_psa_hash_abort( operation );
+        return( status );
+    }
+}
+
+psa_status_t mbedtls_psa_hash_abort(
+    mbedtls_psa_hash_operation_t *operation )
+{
+    switch( operation->alg )
+    {
+        case 0:
+            /* The object has (apparently) been initialized but it is not
+             * in use. It's ok to call abort on such an object, and there's
+             * nothing to do. */
+            break;
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD2)
+        case PSA_ALG_MD2:
+            mbedtls_md2_free( &operation->ctx.md2 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD4)
+        case PSA_ALG_MD4:
+            mbedtls_md4_free( &operation->ctx.md4 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_MD5)
+        case PSA_ALG_MD5:
+            mbedtls_md5_free( &operation->ctx.md5 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160)
+        case PSA_ALG_RIPEMD160:
+            mbedtls_ripemd160_free( &operation->ctx.ripemd160 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_1)
+        case PSA_ALG_SHA_1:
+            mbedtls_sha1_free( &operation->ctx.sha1 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_224)
+        case PSA_ALG_SHA_224:
+            mbedtls_sha256_free( &operation->ctx.sha256 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_256)
+        case PSA_ALG_SHA_256:
+            mbedtls_sha256_free( &operation->ctx.sha256 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_384)
+        case PSA_ALG_SHA_384:
+            mbedtls_sha512_free( &operation->ctx.sha512 );
+            break;
+#endif
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_SHA_512)
+        case PSA_ALG_SHA_512:
+            mbedtls_sha512_free( &operation->ctx.sha512 );
+            break;
+#endif
+        default:
+            return( PSA_ERROR_BAD_STATE );
+    }
+    operation->alg = 0;
+    return( PSA_SUCCESS );
+}
+
+#endif /* MBEDTLS_PSA_CRYPTO_C */
diff --git a/library/psa_crypto_hash.h b/library/psa_crypto_hash.h
new file mode 100644
index 0000000..42a8183
--- /dev/null
+++ b/library/psa_crypto_hash.h
@@ -0,0 +1,236 @@
+/*
+ *  PSA hashing layer on top of Mbed TLS software crypto
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#ifndef PSA_CRYPTO_HASH_H
+#define PSA_CRYPTO_HASH_H
+
+#include <psa/crypto.h>
+#include "mbedtls/md2.h"
+#include "mbedtls/md4.h"
+#include "mbedtls/md5.h"
+#include "mbedtls/ripemd160.h"
+#include "mbedtls/sha1.h"
+#include "mbedtls/sha256.h"
+#include "mbedtls/sha512.h"
+
+typedef struct
+{
+    psa_algorithm_t alg;
+    union
+    {
+        unsigned dummy; /* Make the union non-empty even with no supported algorithms. */
+#if defined(MBEDTLS_MD2_C)
+        mbedtls_md2_context md2;
+#endif
+#if defined(MBEDTLS_MD4_C)
+        mbedtls_md4_context md4;
+#endif
+#if defined(MBEDTLS_MD5_C)
+        mbedtls_md5_context md5;
+#endif
+#if defined(MBEDTLS_RIPEMD160_C)
+        mbedtls_ripemd160_context ripemd160;
+#endif
+#if defined(MBEDTLS_SHA1_C)
+        mbedtls_sha1_context sha1;
+#endif
+#if defined(MBEDTLS_SHA256_C)
+        mbedtls_sha256_context sha256;
+#endif
+#if defined(MBEDTLS_SHA512_C)
+        mbedtls_sha512_context sha512;
+#endif
+    } ctx;
+} mbedtls_psa_hash_operation_t;
+
+#define MBEDTLS_PSA_HASH_OPERATION_INIT {0, {0}}
+
+/** Calculate the hash (digest) of a message using Mbed TLS routines.
+ *
+ * \param alg               The hash algorithm to compute (\c PSA_ALG_XXX value
+ *                          such that #PSA_ALG_IS_HASH(\p alg) is true).
+ * \param[in] input         Buffer containing the message to hash.
+ * \param input_length      Size of the \p input buffer in bytes.
+ * \param[out] hash         Buffer where the hash is to be written.
+ * \param hash_size         Size of the \p hash buffer in bytes.
+ * \param[out] hash_length  On success, the number of bytes
+ *                          that make up the hash value. This is always
+ *                          #PSA_HASH_LENGTH(\p alg).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a hash algorithm.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         \p hash_size is too small
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ */
+psa_status_t mbedtls_psa_hash_compute(
+    psa_algorithm_t alg,
+    const uint8_t *input,
+    size_t input_length,
+    uint8_t *hash,
+    size_t hash_size,
+    size_t *hash_length);
+
+/** Set up a multipart hash operation using Mbed TLS routines.
+ *
+ * If an error occurs at any step after a call to mbedtls_psa_hash_setup(), the
+ * operation will need to be reset by a call to mbedtls_psa_hash_abort(). The
+ * core may call mbedtls_psa_hash_abort() at any time after the operation
+ * has been initialized.
+ *
+ * After a successful call to mbedtls_psa_hash_setup(), the core must
+ * eventually terminate the operation. The following events terminate an
+ * operation:
+ * - A successful call to mbedtls_psa_hash_finish() or mbedtls_psa_hash_verify().
+ * - A call to mbedtls_psa_hash_abort().
+ *
+ * \param[in,out] operation The operation object to set up. It must have
+ *                          been initialized to all-zero and not yet be in use.
+ * \param alg               The hash algorithm to compute (\c PSA_ALG_XXX value
+ *                          such that #PSA_ALG_IS_HASH(\p alg) is true).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not a supported hash algorithm.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ */
+psa_status_t mbedtls_psa_hash_setup(
+    mbedtls_psa_hash_operation_t *operation,
+    psa_algorithm_t alg );
+
+/** Clone an Mbed TLS hash operation.
+ *
+ * This function copies the state of an ongoing hash operation to
+ * a new operation object. In other words, this function is equivalent
+ * to calling mbedtls_psa_hash_setup() on \p target_operation with the same
+ * algorithm that \p source_operation was set up for, then
+ * mbedtls_psa_hash_update() on \p target_operation with the same input that
+ * that was passed to \p source_operation. After this function returns, the
+ * two objects are independent, i.e. subsequent calls involving one of
+ * the objects do not affect the other object.
+ *
+ * \param[in] source_operation      The active hash operation to clone.
+ * \param[in,out] target_operation  The operation object to set up.
+ *                                  It must be initialized but not active.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The \p source_operation state is not valid (it must be active).
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The \p target_operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ */
+psa_status_t mbedtls_psa_hash_clone(
+    const mbedtls_psa_hash_operation_t *source_operation,
+    mbedtls_psa_hash_operation_t *target_operation );
+
+/** Add a message fragment to a multipart Mbed TLS hash operation.
+ *
+ * The application must call mbedtls_psa_hash_setup() before calling this function.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling mbedtls_psa_hash_abort().
+ *
+ * \param[in,out] operation Active hash operation.
+ * \param[in] input         Buffer containing the message fragment to hash.
+ * \param input_length      Size of the \p input buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it muct be active).
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ */
+psa_status_t mbedtls_psa_hash_update(
+    mbedtls_psa_hash_operation_t *operation,
+    const uint8_t *input,
+    size_t input_length );
+
+/** Finish the calculation of the Mbed TLS-calculated hash of a message.
+ *
+ * The application must call mbedtls_psa_hash_setup() before calling this function.
+ * This function calculates the hash of the message formed by concatenating
+ * the inputs passed to preceding calls to mbedtls_psa_hash_update().
+ *
+ * When this function returns successfuly, the operation becomes inactive.
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling mbedtls_psa_hash_abort().
+ *
+ * \param[in,out] operation     Active hash operation.
+ * \param[out] hash             Buffer where the hash is to be written.
+ * \param hash_size             Size of the \p hash buffer in bytes.
+ * \param[out] hash_length      On success, the number of bytes
+ *                              that make up the hash value. This is always
+ *                              #PSA_HASH_LENGTH(\c alg) where \c alg is the
+ *                              hash algorithm that is calculated.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p hash buffer is too small. You can determine a
+ *         sufficient buffer size by calling #PSA_HASH_LENGTH(\c alg)
+ *         where \c alg is the hash algorithm that is calculated.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ */
+psa_status_t mbedtls_psa_hash_finish(
+    mbedtls_psa_hash_operation_t *operation,
+    uint8_t *hash,
+    size_t hash_size,
+    size_t *hash_length );
+
+/** Abort an Mbed TLS hash operation.
+ *
+ * Aborting an operation frees all associated resources except for the
+ * \p operation structure itself. Once aborted, the operation object
+ * can be reused for another operation by calling
+ * mbedtls_psa_hash_setup() again.
+ *
+ * You may call this function any time after the operation object has
+ * been initialized by one of the methods described in #psa_hash_operation_t.
+ *
+ * In particular, calling mbedtls_psa_hash_abort() after the operation has been
+ * terminated by a call to mbedtls_psa_hash_abort(), mbedtls_psa_hash_finish() or
+ * mbedtls_psa_hash_verify() is safe and has no effect.
+ *
+ * \param[in,out] operation     Initialized hash operation.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ */
+psa_status_t mbedtls_psa_hash_abort(
+    mbedtls_psa_hash_operation_t *operation );
+
+#endif /* PSA_CRYPTO_HASH_H */