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+/**
+ * \file x509_csr.h
+ *
+ * \brief X.509 certificate signing request parsing and writing
+ */
+/*
+ * Copyright (C) 2006-2015, 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_X509_CSR_H
+#define MBEDTLS_X509_CSR_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include "x509.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup x509_module
+ * \{ */
+
+/**
+ * \name Structures and functions for X.509 Certificate Signing Requests (CSR)
+ * \{
+ */
+
+/**
+ * Certificate Signing Request (CSR) structure.
+ */
+typedef struct mbedtls_x509_csr
+{
+ mbedtls_x509_buf raw; /**< The raw CSR data (DER). */
+ mbedtls_x509_buf cri; /**< The raw CertificateRequestInfo body (DER). */
+
+ int version; /**< CSR version (1=v1). */
+
+ mbedtls_x509_buf subject_raw; /**< The raw subject data (DER). */
+ mbedtls_x509_name subject; /**< The parsed subject data (named information object). */
+
+ mbedtls_pk_context pk; /**< Container for the public key context. */
+
+ mbedtls_x509_buf sig_oid;
+ mbedtls_x509_buf sig;
+ mbedtls_md_type_t sig_md; /**< Internal representation of the MD algorithm of the signature algorithm, e.g. MBEDTLS_MD_SHA256 */
+ mbedtls_pk_type_t sig_pk; /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. MBEDTLS_PK_RSA */
+ void *sig_opts; /**< Signature options to be passed to mbedtls_pk_verify_ext(), e.g. for RSASSA-PSS */
+}
+mbedtls_x509_csr;
+
+/**
+ * Container for writing a CSR
+ */
+typedef struct mbedtls_x509write_csr
+{
+ mbedtls_pk_context *key;
+ mbedtls_asn1_named_data *subject;
+ mbedtls_md_type_t md_alg;
+ mbedtls_asn1_named_data *extensions;
+}
+mbedtls_x509write_csr;
+
+#if defined(MBEDTLS_X509_CSR_PARSE_C)
+/**
+ * \brief Load a Certificate Signing Request (CSR) in DER format
+ *
+ * \note CSR attributes (if any) are currently silently ignored.
+ *
+ * \param csr CSR context to fill
+ * \param buf buffer holding the CRL data
+ * \param buflen size of the buffer
+ *
+ * \return 0 if successful, or a specific X509 error code
+ */
+int mbedtls_x509_csr_parse_der( mbedtls_x509_csr *csr,
+ const unsigned char *buf, size_t buflen );
+
+/**
+ * \brief Load a Certificate Signing Request (CSR), DER or PEM format
+ *
+ * \note See notes for \c mbedtls_x509_csr_parse_der()
+ *
+ * \param csr CSR context to fill
+ * \param buf buffer holding the CRL data
+ * \param buflen size of the buffer
+ * (including the terminating null byte for PEM data)
+ *
+ * \return 0 if successful, or a specific X509 or PEM error code
+ */
+int mbedtls_x509_csr_parse( mbedtls_x509_csr *csr, const unsigned char *buf, size_t buflen );
+
+#if defined(MBEDTLS_FS_IO)
+/**
+ * \brief Load a Certificate Signing Request (CSR)
+ *
+ * \note See notes for \c mbedtls_x509_csr_parse()
+ *
+ * \param csr CSR context to fill
+ * \param path filename to read the CSR from
+ *
+ * \return 0 if successful, or a specific X509 or PEM error code
+ */
+int mbedtls_x509_csr_parse_file( mbedtls_x509_csr *csr, const char *path );
+#endif /* MBEDTLS_FS_IO */
+
+/**
+ * \brief Returns an informational string about the
+ * CSR.
+ *
+ * \param buf Buffer to write to
+ * \param size Maximum size of buffer
+ * \param prefix A line prefix
+ * \param csr The X509 CSR to represent
+ *
+ * \return The length of the string written (not including the
+ * terminated nul byte), or a negative error code.
+ */
+int mbedtls_x509_csr_info( char *buf, size_t size, const char *prefix,
+ const mbedtls_x509_csr *csr );
+
+/**
+ * \brief Initialize a CSR
+ *
+ * \param csr CSR to initialize
+ */
+void mbedtls_x509_csr_init( mbedtls_x509_csr *csr );
+
+/**
+ * \brief Unallocate all CSR data
+ *
+ * \param csr CSR to free
+ */
+void mbedtls_x509_csr_free( mbedtls_x509_csr *csr );
+#endif /* MBEDTLS_X509_CSR_PARSE_C */
+
+/* \} name */
+/* \} addtogroup x509_module */
+
+#if defined(MBEDTLS_X509_CSR_WRITE_C)
+/**
+ * \brief Initialize a CSR context
+ *
+ * \param ctx CSR context to initialize
+ */
+void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx );
+
+/**
+ * \brief Set the subject name for a CSR
+ * Subject names should contain a comma-separated list
+ * of OID types and values:
+ * e.g. "C=UK,O=ARM,CN=mbed TLS Server 1"
+ *
+ * \param ctx CSR context to use
+ * \param subject_name subject name to set
+ *
+ * \return 0 if subject name was parsed successfully, or
+ * a specific error code
+ */
+int mbedtls_x509write_csr_set_subject_name( mbedtls_x509write_csr *ctx,
+ const char *subject_name );
+
+/**
+ * \brief Set the key for a CSR (public key will be included,
+ * private key used to sign the CSR when writing it)
+ *
+ * \param ctx CSR context to use
+ * \param key Asymetric key to include
+ */
+void mbedtls_x509write_csr_set_key( mbedtls_x509write_csr *ctx, mbedtls_pk_context *key );
+
+/**
+ * \brief Set the MD algorithm to use for the signature
+ * (e.g. MBEDTLS_MD_SHA1)
+ *
+ * \param ctx CSR context to use
+ * \param md_alg MD algorithm to use
+ */
+void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *ctx, mbedtls_md_type_t md_alg );
+
+/**
+ * \brief Set the Key Usage Extension flags
+ * (e.g. MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_KEY_CERT_SIGN)
+ *
+ * \param ctx CSR context to use
+ * \param key_usage key usage flags to set
+ *
+ * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
+ *
+ * \note The <code>decipherOnly</code> flag from the Key Usage
+ * extension is represented by bit 8 (i.e.
+ * <code>0x8000</code>), which cannot typically be represented
+ * in an unsigned char. Therefore, the flag
+ * <code>decipherOnly</code> (i.e.
+ * #MBEDTLS_X509_KU_DECIPHER_ONLY) cannot be set using this
+ * function.
+ */
+int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage );
+
+/**
+ * \brief Set the Netscape Cert Type flags
+ * (e.g. MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT | MBEDTLS_X509_NS_CERT_TYPE_EMAIL)
+ *
+ * \param ctx CSR context to use
+ * \param ns_cert_type Netscape Cert Type flags to set
+ *
+ * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
+ */
+int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx,
+ unsigned char ns_cert_type );
+
+/**
+ * \brief Generic function to add to or replace an extension in the
+ * CSR
+ *
+ * \param ctx CSR context to use
+ * \param oid OID of the extension
+ * \param oid_len length of the OID
+ * \param val value of the extension OCTET STRING
+ * \param val_len length of the value data
+ *
+ * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
+ */
+int mbedtls_x509write_csr_set_extension( mbedtls_x509write_csr *ctx,
+ const char *oid, size_t oid_len,
+ const unsigned char *val, size_t val_len );
+
+/**
+ * \brief Free the contents of a CSR context
+ *
+ * \param ctx CSR context to free
+ */
+void mbedtls_x509write_csr_free( mbedtls_x509write_csr *ctx );
+
+/**
+ * \brief Write a CSR (Certificate Signing Request) to a
+ * DER structure
+ * Note: data is written at the end of the buffer! Use the
+ * return value to determine where you should start
+ * using the buffer
+ *
+ * \param ctx CSR to write away
+ * \param buf buffer to write to
+ * \param size size of the buffer
+ * \param f_rng RNG function (for signature, see note)
+ * \param p_rng RNG parameter
+ *
+ * \return length of data written if successful, or a specific
+ * error code
+ *
+ * \note f_rng may be NULL if RSA is used for signature and the
+ * signature is made offline (otherwise f_rng is desirable
+ * for countermeasures against timing attacks).
+ * ECDSA signatures always require a non-NULL f_rng.
+ */
+int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng );
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+/**
+ * \brief Write a CSR (Certificate Signing Request) to a
+ * PEM string
+ *
+ * \param ctx CSR to write away
+ * \param buf buffer to write to
+ * \param size size of the buffer
+ * \param f_rng RNG function (for signature, see note)
+ * \param p_rng RNG parameter
+ *
+ * \return 0 if successful, or a specific error code
+ *
+ * \note f_rng may be NULL if RSA is used for signature and the
+ * signature is made offline (otherwise f_rng is desirable
+ * for countermeasures against timing attacks).
+ * ECDSA signatures always require a non-NULL f_rng.
+ */
+int mbedtls_x509write_csr_pem( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng );
+#endif /* MBEDTLS_PEM_WRITE_C */
+#endif /* MBEDTLS_X509_CSR_WRITE_C */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* mbedtls_x509_csr.h */