psa: Move xxx_load_representation functions to RSA/ECP specific modules
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/psa_crypto_rsa.c b/library/psa_crypto_rsa.c
new file mode 100644
index 0000000..b4ea86a
--- /dev/null
+++ b/library/psa_crypto_rsa.c
@@ -0,0 +1,128 @@
+/*
+ * PSA RSA layer on top of Mbed TLS 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_rsa.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include "mbedtls/platform.h"
+#if !defined(MBEDTLS_PLATFORM_C)
+#define mbedtls_calloc calloc
+#define mbedtls_free free
+#endif
+
+#include <mbedtls/rsa.h>
+#include <mbedtls/error.h>
+#include <mbedtls/pk.h>
+#include <mbedtls/pk_internal.h>
+
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \
+ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \
+ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) || \
+ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) || \
+ defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
+ defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
+
+/* Mbed TLS doesn't support non-byte-aligned key sizes (i.e. key sizes
+ * that are not a multiple of 8) well. For example, there is only
+ * mbedtls_rsa_get_len(), which returns a number of bytes, and no
+ * way to return the exact bit size of a key.
+ * To keep things simple, reject non-byte-aligned key sizes. */
+static psa_status_t psa_check_rsa_key_byte_aligned(
+ const mbedtls_rsa_context *rsa )
+{
+ mbedtls_mpi n;
+ psa_status_t status;
+ mbedtls_mpi_init( &n );
+ status = mbedtls_to_psa_error(
+ mbedtls_rsa_export( rsa, &n, NULL, NULL, NULL, NULL ) );
+ if( status == PSA_SUCCESS )
+ {
+ if( mbedtls_mpi_bitlen( &n ) % 8 != 0 )
+ status = PSA_ERROR_NOT_SUPPORTED;
+ }
+ mbedtls_mpi_free( &n );
+ return( status );
+}
+
+psa_status_t mbedtls_psa_rsa_load_representation(
+ psa_key_type_t type, const uint8_t *data, size_t data_length,
+ mbedtls_rsa_context **p_rsa )
+{
+ psa_status_t status;
+ mbedtls_pk_context ctx;
+ size_t bits;
+ mbedtls_pk_init( &ctx );
+
+ /* Parse the data. */
+ if( PSA_KEY_TYPE_IS_KEY_PAIR( type ) )
+ status = mbedtls_to_psa_error(
+ mbedtls_pk_parse_key( &ctx, data, data_length, NULL, 0 ) );
+ else
+ status = mbedtls_to_psa_error(
+ mbedtls_pk_parse_public_key( &ctx, data, data_length ) );
+ if( status != PSA_SUCCESS )
+ goto exit;
+
+ /* We have something that the pkparse module recognizes. If it is a
+ * valid RSA key, store it. */
+ if( mbedtls_pk_get_type( &ctx ) != MBEDTLS_PK_RSA )
+ {
+ status = PSA_ERROR_INVALID_ARGUMENT;
+ goto exit;
+ }
+
+ /* The size of an RSA key doesn't have to be a multiple of 8. Mbed TLS
+ * supports non-byte-aligned key sizes, but not well. For example,
+ * mbedtls_rsa_get_len() returns the key size in bytes, not in bits. */
+ bits = PSA_BYTES_TO_BITS( mbedtls_rsa_get_len( mbedtls_pk_rsa( ctx ) ) );
+ if( bits > PSA_VENDOR_RSA_MAX_KEY_BITS )
+ {
+ status = PSA_ERROR_NOT_SUPPORTED;
+ goto exit;
+ }
+ status = psa_check_rsa_key_byte_aligned( mbedtls_pk_rsa( ctx ) );
+ if( status != PSA_SUCCESS )
+ goto exit;
+
+ /* Copy out the pointer to the RSA context, and reset the PK context
+ * such that pk_free doesn't free the RSA context we just grabbed. */
+ *p_rsa = mbedtls_pk_rsa( ctx );
+ ctx.pk_info = NULL;
+
+exit:
+ mbedtls_pk_free( &ctx );
+ return( status );
+}
+
+#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) ||
+ * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) ||
+ * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) ||
+ * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) ||
+ * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
+ * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
+
+#endif /* MBEDTLS_PSA_CRYPTO_C */