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+/**
+ * \file error.h
+ *
+ * \brief Error to string translation
+ */
+/*
+ * Copyright (C) 2006-2018, ARM Limited, All Rights Reserved
+ * 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.
+ *
+ * This file is part of mbed TLS (https://tls.mbed.org)
+ */
+#ifndef MBEDTLS_ERROR_H
+#define MBEDTLS_ERROR_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include <stddef.h>
+
+/**
+ * Error code layout.
+ *
+ * Currently we try to keep all error codes within the negative space of 16
+ * bits signed integers to support all platforms (-0x0001 - -0x7FFF). In
+ * addition we'd like to give two layers of information on the error if
+ * possible.
+ *
+ * For that purpose the error codes are segmented in the following manner:
+ *
+ * 16 bit error code bit-segmentation
+ *
+ * 1 bit - Unused (sign bit)
+ * 3 bits - High level module ID
+ * 5 bits - Module-dependent error code
+ * 7 bits - Low level module errors
+ *
+ * For historical reasons, low-level error codes are divided in even and odd,
+ * even codes were assigned first, and -1 is reserved for other errors.
+ *
+ * Low-level module errors (0x0002-0x007E, 0x0003-0x007F)
+ *
+ * Module Nr Codes assigned
+ * MPI 7 0x0002-0x0010
+ * GCM 3 0x0012-0x0014 0x0013-0x0013
+ * BLOWFISH 3 0x0016-0x0018 0x0017-0x0017
+ * THREADING 3 0x001A-0x001E
+ * AES 5 0x0020-0x0022 0x0021-0x0025
+ * CAMELLIA 3 0x0024-0x0026 0x0027-0x0027
+ * XTEA 2 0x0028-0x0028 0x0029-0x0029
+ * BASE64 2 0x002A-0x002C
+ * OID 1 0x002E-0x002E 0x000B-0x000B
+ * PADLOCK 1 0x0030-0x0030
+ * DES 2 0x0032-0x0032 0x0033-0x0033
+ * CTR_DBRG 4 0x0034-0x003A
+ * ENTROPY 3 0x003C-0x0040 0x003D-0x003F
+ * NET 13 0x0042-0x0052 0x0043-0x0049
+ * ARIA 4 0x0058-0x005E
+ * ASN1 7 0x0060-0x006C
+ * CMAC 1 0x007A-0x007A
+ * PBKDF2 1 0x007C-0x007C
+ * HMAC_DRBG 4 0x0003-0x0009
+ * CCM 3 0x000D-0x0011
+ * ARC4 1 0x0019-0x0019
+ * MD2 1 0x002B-0x002B
+ * MD4 1 0x002D-0x002D
+ * MD5 1 0x002F-0x002F
+ * RIPEMD160 1 0x0031-0x0031
+ * SHA1 1 0x0035-0x0035 0x0073-0x0073
+ * SHA256 1 0x0037-0x0037 0x0074-0x0074
+ * SHA512 1 0x0039-0x0039 0x0075-0x0075
+ * CHACHA20 3 0x0051-0x0055
+ * POLY1305 3 0x0057-0x005B
+ * CHACHAPOLY 2 0x0054-0x0056
+ * PLATFORM 1 0x0070-0x0072
+ *
+ * High-level module nr (3 bits - 0x0...-0x7...)
+ * Name ID Nr of Errors
+ * PEM 1 9
+ * PKCS#12 1 4 (Started from top)
+ * X509 2 20
+ * PKCS5 2 4 (Started from top)
+ * DHM 3 11
+ * PK 3 15 (Started from top)
+ * RSA 4 11
+ * ECP 4 10 (Started from top)
+ * MD 5 5
+ * HKDF 5 1 (Started from top)
+ * CIPHER 6 8 (Started from 0x6080)
+ * SSL 6 24 (Started from top, plus 0x6000)
+ * SSL 7 32
+ *
+ * Module dependent error code (5 bits 0x.00.-0x.F8.)
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Translate a mbed TLS error code into a string representation,
+ * Result is truncated if necessary and always includes a terminating
+ * null byte.
+ *
+ * \param errnum error code
+ * \param buffer buffer to place representation in
+ * \param buflen length of the buffer
+ */
+void mbedtls_strerror( int errnum, char *buffer, size_t buflen );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* error.h */