diff --git a/library/hash_info.c b/library/hash_info.c
new file mode 100644
index 0000000..b45d1d2
--- /dev/null
+++ b/library/hash_info.c
@@ -0,0 +1,109 @@
+/*
+ * Hash information that's independent from the crypto implementation.
+ *
+ * (See the corresponding header file for usage notes.)
+ */
+/*
+ *  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 "hash_info.h"
+#include "or_psa_helpers.h"
+
+typedef struct
+{
+    psa_algorithm_t psa_alg;
+    mbedtls_md_type_t md_type;
+    unsigned char size;
+    unsigned char block_size;
+} hash_entry;
+
+static const hash_entry hash_table[] = {
+#if defined(MBEDTLS_OR_PSA_WANT_ALG_MD5)
+    { PSA_ALG_MD5, MBEDTLS_MD_MD5, 16, 64 },
+#endif
+#if defined(MBEDTLS_OR_PSA_WANT_ALG_RIPEMD160)
+    { PSA_ALG_RIPEMD160, MBEDTLS_MD_RIPEMD160, 20, 64 },
+#endif
+#if defined(MBEDTLS_OR_PSA_WANT_ALG_SHA_1)
+    { PSA_ALG_SHA_1, MBEDTLS_MD_SHA1, 20, 64 },
+#endif
+#if defined(MBEDTLS_OR_PSA_WANT_ALG_SHA_224)
+    { PSA_ALG_SHA_224, MBEDTLS_MD_SHA224, 28, 64 },
+#endif
+#if defined(MBEDTLS_OR_PSA_WANT_ALG_SHA_256)
+    { PSA_ALG_SHA_256, MBEDTLS_MD_SHA256, 32, 64 },
+#endif
+#if defined(MBEDTLS_OR_PSA_WANT_ALG_SHA_384)
+    { PSA_ALG_SHA_384, MBEDTLS_MD_SHA384, 48, 128 },
+#endif
+#if defined(MBEDTLS_OR_PSA_WANT_ALG_SHA_512)
+    { PSA_ALG_SHA_512, MBEDTLS_MD_SHA512, 64, 128 },
+#endif
+    { PSA_ALG_NONE, MBEDTLS_MD_NONE, 0, 0 },
+};
+
+/* Get size from MD type */
+unsigned char mbedtls_hash_info_get_size( mbedtls_md_type_t md_type )
+{
+    const hash_entry *entry = hash_table;
+    while( entry->md_type != MBEDTLS_MD_NONE &&
+           entry->md_type != md_type )
+    {
+        entry++;
+    }
+
+    return entry->size;
+}
+
+/* Get block size from MD type */
+unsigned char mbedtls_hash_info_get_block_size( mbedtls_md_type_t md_type )
+{
+    const hash_entry *entry = hash_table;
+    while( entry->md_type != MBEDTLS_MD_NONE &&
+           entry->md_type != md_type )
+    {
+        entry++;
+    }
+
+    return entry->block_size;
+}
+
+/* Get PSA from MD */
+psa_algorithm_t mbedtls_hash_info_psa_from_md( mbedtls_md_type_t md_type )
+{
+    const hash_entry *entry = hash_table;
+    while( entry->md_type != MBEDTLS_MD_NONE &&
+           entry->md_type != md_type )
+    {
+        entry++;
+    }
+
+    return entry->psa_alg;
+}
+
+/* Get PSA from MD */
+mbedtls_md_type_t mbedtls_hash_info_md_from_psa( psa_algorithm_t psa_alg )
+{
+    const hash_entry *entry = hash_table;
+    while( entry->md_type != MBEDTLS_MD_NONE &&
+           entry->psa_alg != psa_alg )
+    {
+        entry++;
+    }
+
+    return entry->md_type;
+}