Add implemetation of ECP keypair export function
Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index 9895573..e71a445 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -1278,6 +1278,26 @@
const mbedtls_ecp_keypair *pub, const mbedtls_ecp_keypair *prv,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
+/**
+ * \brief This function exports generic key-pair parameters.
+ *
+ * \param kp The key pair to export from.
+ * \param grp Slot for exported ECP group.
+ * It must point to an initialized ECP group.
+ * \param d Slot for the exported secret value.
+ * It must point to an initialized mpi.
+ * \param Q Slot for the exported public value.
+ * It must point to an initialized ECP point.
+ *
+ * \return \c 0 on success,
+ * \return #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
+ * \return #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if key id doesn't
+ * correspond to a known group.
+ * \return Another negative error code on other kinds of failure.
+ */
+int mbedtls_ecp_export(const mbedtls_ecp_keypair *key, mbedtls_ecp_group *grp,
+ mbedtls_mpi *d, mbedtls_ecp_point *Q);
+
#if defined(MBEDTLS_SELF_TEST)
/**
diff --git a/library/ecp.c b/library/ecp.c
index ba76abb..71114cd 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -3356,6 +3356,30 @@
return( ret );
}
+/*
+ * Export generic key-pair parameters.
+ */
+int mbedtls_ecp_export(const mbedtls_ecp_keypair *key, mbedtls_ecp_group *grp,
+ mbedtls_mpi *d, mbedtls_ecp_point *Q)
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ ECP_VALIDATE_RET( key != NULL );
+ ECP_VALIDATE_RET( grp != NULL );
+ ECP_VALIDATE_RET( d != NULL );
+ ECP_VALIDATE_RET( Q != NULL );
+
+ if( ( ret = mbedtls_ecp_group_copy( grp, &key->grp ) ) != 0 )
+ return ret;
+
+ if( ( ret = mbedtls_mpi_copy( d, &key->d ) ) != 0 )
+ return ret;
+
+ if( ( ret = mbedtls_ecp_copy( Q, &key->Q ) ) != 0 )
+ return ret;
+
+ return 0;
+}
+
#if defined(MBEDTLS_SELF_TEST)
/*