diff --git a/library/psa_crypto_ecp.c b/library/psa_crypto_ecp.c
index 23ec6ac..bd40f2e 100644
--- a/library/psa_crypto_ecp.c
+++ b/library/psa_crypto_ecp.c
@@ -35,6 +35,7 @@
 #define mbedtls_free   free
 #endif
 
+#include <mbedtls/ecdsa.h>
 #include <mbedtls/ecp.h>
 #include <mbedtls/error.h>
 
@@ -337,6 +338,145 @@
 }
 #endif /* defined(BUILTIN_KEY_TYPE_ECC_KEY_PAIR) */
 
+/****************************************************************/
+/* ECDSA sign/verify */
+/****************************************************************/
+
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
+    defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
+psa_status_t mbedtls_psa_ecdsa_sign_hash(
+    const psa_key_attributes_t *attributes,
+    const uint8_t *key_buffer, size_t key_buffer_size,
+    psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
+    uint8_t *signature, size_t signature_size, size_t *signature_length )
+{
+    psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
+    mbedtls_ecp_keypair *ecp = NULL;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    size_t curve_bytes;
+    mbedtls_mpi r, s;
+
+    status = mbedtls_psa_ecp_load_representation( attributes->core.type,
+                                                  attributes->core.bits,
+                                                  key_buffer,
+                                                  key_buffer_size,
+                                                  &ecp );
+    if( status != PSA_SUCCESS )
+        return( status );
+
+    curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
+    mbedtls_mpi_init( &r );
+    mbedtls_mpi_init( &s );
+
+    if( signature_size < 2 * curve_bytes )
+    {
+        ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
+        goto cleanup;
+    }
+
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
+    if( PSA_ALG_DSA_IS_DETERMINISTIC( alg ) )
+    {
+        psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH( alg );
+        const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg );
+        mbedtls_md_type_t md_alg = mbedtls_md_get_type( md_info );
+        MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det_ext(
+                             &ecp->grp, &r, &s,
+                             &ecp->d, hash,
+                             hash_length, md_alg,
+                             mbedtls_psa_get_random,
+                             MBEDTLS_PSA_RANDOM_STATE ) );
+    }
+    else
+#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
+    {
+        (void) alg;
+        MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ecp->grp, &r, &s, &ecp->d,
+                                             hash, hash_length,
+                                             mbedtls_psa_get_random,
+                                             MBEDTLS_PSA_RANDOM_STATE ) );
+    }
+
+    MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &r,
+                                               signature,
+                                               curve_bytes ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &s,
+                                               signature + curve_bytes,
+                                               curve_bytes ) );
+cleanup:
+    mbedtls_mpi_free( &r );
+    mbedtls_mpi_free( &s );
+    if( ret == 0 )
+        *signature_length = 2 * curve_bytes;
+
+    mbedtls_ecp_keypair_free( ecp );
+    mbedtls_free( ecp );
+
+    return( mbedtls_to_psa_error( ret ) );
+}
+
+psa_status_t mbedtls_psa_ecdsa_verify_hash(
+    const psa_key_attributes_t *attributes,
+    const uint8_t *key_buffer, size_t key_buffer_size,
+    psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
+    const uint8_t *signature, size_t signature_length )
+{
+    psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
+    mbedtls_ecp_keypair *ecp = NULL;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    size_t curve_bytes;
+    mbedtls_mpi r, s;
+
+    (void)alg;
+
+    status = mbedtls_psa_ecp_load_representation( attributes->core.type,
+                                                  attributes->core.bits,
+                                                  key_buffer,
+                                                  key_buffer_size,
+                                                  &ecp );
+    if( status != PSA_SUCCESS )
+        return( status );
+
+    curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
+    mbedtls_mpi_init( &r );
+    mbedtls_mpi_init( &s );
+
+    if( signature_length != 2 * curve_bytes )
+    {
+        ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
+        goto cleanup;
+    }
+
+    MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r,
+                                              signature,
+                                              curve_bytes ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &s,
+                                              signature + curve_bytes,
+                                              curve_bytes ) );
+
+    /* Check whether the public part is loaded. If not, load it. */
+    if( mbedtls_ecp_is_zero( &ecp->Q ) )
+    {
+        MBEDTLS_MPI_CHK(
+            mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
+                             mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE ) );
+    }
+
+    ret = mbedtls_ecdsa_verify( &ecp->grp, hash, hash_length,
+                                &ecp->Q, &r, &s );
+
+cleanup:
+    mbedtls_mpi_free( &r );
+    mbedtls_mpi_free( &s );
+    mbedtls_ecp_keypair_free( ecp );
+    mbedtls_free( ecp );
+
+    return( mbedtls_to_psa_error( ret ) );
+}
+
+#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
+        * defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
+
 #if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
     defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY)