Infineon: Add cyw20829 platform, shared slot feature, json memory map, psoc6 xip
Based in 1.8.0 release of MCUBoot library
This commit adds CYW20829 Infineon platform support with following capabilities:
1. Overwrite and swap upgrade mode support
2. Multi-image with up to 4 images
3. Hardware security counter is supported for CYW20829 platform
Add XIP support for PSOC6 platform - place BOOT slot in external memory and execute it in place using SMIF in XIP mode
and some new features for Infineon devices.
1. Shared upgrade slot feature - use one shared area for upgrade slots of multiple images
2. Memory map defined using JSON file - define memory regions for bootloader and user app in conventional way using JSON file
diff --git a/ext/mbedtls-asn1/include/mbedtls/rsa.h b/ext/mbedtls-asn1/include/mbedtls/rsa.h
new file mode 100644
index 0000000..cffbe3b
--- /dev/null
+++ b/ext/mbedtls-asn1/include/mbedtls/rsa.h
@@ -0,0 +1,1119 @@
+/**
+ * \file rsa.h
+ *
+ * \brief This file provides an API for the RSA public-key cryptosystem.
+ *
+ * The RSA public-key cryptosystem is defined in <em>Public-Key
+ * Cryptography Standards (PKCS) #1 v1.5: RSA Encryption</em>
+ * and <em>Public-Key Cryptography Standards (PKCS) #1 v2.1:
+ * RSA Cryptography Specifications</em>.
+ *
+ */
+/*
+ * 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.
+ */
+#ifndef MBEDTLS_RSA_H
+#define MBEDTLS_RSA_H
+#include "mbedtls/private_access.h"
+
+#include "mbedtls/build_info.h"
+
+#include "mbedtls/bignum.h"
+#include "mbedtls/md.h"
+
+#if defined(MBEDTLS_THREADING_C)
+#include "mbedtls/threading.h"
+#endif
+
+/*
+ * RSA Error codes
+ */
+#define MBEDTLS_ERR_RSA_BAD_INPUT_DATA -0x4080 /**< Bad input parameters to function. */
+#define MBEDTLS_ERR_RSA_INVALID_PADDING -0x4100 /**< Input data contains invalid padding and is rejected. */
+#define MBEDTLS_ERR_RSA_KEY_GEN_FAILED -0x4180 /**< Something failed during generation of a key. */
+#define MBEDTLS_ERR_RSA_KEY_CHECK_FAILED -0x4200 /**< Key failed to pass the validity check of the library. */
+#define MBEDTLS_ERR_RSA_PUBLIC_FAILED -0x4280 /**< The public key operation failed. */
+#define MBEDTLS_ERR_RSA_PRIVATE_FAILED -0x4300 /**< The private key operation failed. */
+#define MBEDTLS_ERR_RSA_VERIFY_FAILED -0x4380 /**< The PKCS#1 verification failed. */
+#define MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE -0x4400 /**< The output buffer for decryption is not large enough. */
+#define MBEDTLS_ERR_RSA_RNG_FAILED -0x4480 /**< The random generator failed to generate non-zeros. */
+
+/*
+ * RSA constants
+ */
+
+#define MBEDTLS_RSA_PKCS_V15 0 /**< Use PKCS#1 v1.5 encoding. */
+#define MBEDTLS_RSA_PKCS_V21 1 /**< Use PKCS#1 v2.1 encoding. */
+
+#define MBEDTLS_RSA_SIGN 1 /**< Identifier for RSA signature operations. */
+#define MBEDTLS_RSA_CRYPT 2 /**< Identifier for RSA encryption and decryption operations. */
+
+#define MBEDTLS_RSA_SALT_LEN_ANY -1
+
+/*
+ * The above constants may be used even if the RSA module is compile out,
+ * eg for alternative (PKCS#11) RSA implemenations in the PK layers.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(MBEDTLS_RSA_ALT)
+// Regular implementation
+//
+
+/**
+ * \brief The RSA context structure.
+ */
+typedef struct mbedtls_rsa_context
+{
+ int MBEDTLS_PRIVATE(ver); /*!< Reserved for internal purposes.
+ * Do not set this field in application
+ * code. Its meaning might change without
+ * notice. */
+ size_t MBEDTLS_PRIVATE(len); /*!< The size of \p N in Bytes. */
+
+ mbedtls_mpi MBEDTLS_PRIVATE(N); /*!< The public modulus. */
+ mbedtls_mpi MBEDTLS_PRIVATE(E); /*!< The public exponent. */
+
+ mbedtls_mpi MBEDTLS_PRIVATE(D); /*!< The private exponent. */
+ mbedtls_mpi MBEDTLS_PRIVATE(P); /*!< The first prime factor. */
+ mbedtls_mpi MBEDTLS_PRIVATE(Q); /*!< The second prime factor. */
+
+ mbedtls_mpi MBEDTLS_PRIVATE(DP); /*!< <code>D % (P - 1)</code>. */
+ mbedtls_mpi MBEDTLS_PRIVATE(DQ); /*!< <code>D % (Q - 1)</code>. */
+ mbedtls_mpi MBEDTLS_PRIVATE(QP); /*!< <code>1 / (Q % P)</code>. */
+
+ mbedtls_mpi MBEDTLS_PRIVATE(RN); /*!< cached <code>R^2 mod N</code>. */
+
+ mbedtls_mpi MBEDTLS_PRIVATE(RP); /*!< cached <code>R^2 mod P</code>. */
+ mbedtls_mpi MBEDTLS_PRIVATE(RQ); /*!< cached <code>R^2 mod Q</code>. */
+
+ mbedtls_mpi MBEDTLS_PRIVATE(Vi); /*!< The cached blinding value. */
+ mbedtls_mpi MBEDTLS_PRIVATE(Vf); /*!< The cached un-blinding value. */
+
+ int MBEDTLS_PRIVATE(padding); /*!< Selects padding mode:
+ #MBEDTLS_RSA_PKCS_V15 for 1.5 padding and
+ #MBEDTLS_RSA_PKCS_V21 for OAEP or PSS. */
+ int MBEDTLS_PRIVATE(hash_id); /*!< Hash identifier of mbedtls_md_type_t type,
+ as specified in md.h for use in the MGF
+ mask generating function used in the
+ EME-OAEP and EMSA-PSS encodings. */
+#if defined(MBEDTLS_THREADING_C)
+ /* Invariant: the mutex is initialized iff ver != 0. */
+ mbedtls_threading_mutex_t MBEDTLS_PRIVATE(mutex); /*!< Thread-safety mutex. */
+#endif
+}
+mbedtls_rsa_context;
+
+#else /* MBEDTLS_RSA_ALT */
+#include "rsa_alt.h"
+#endif /* MBEDTLS_RSA_ALT */
+
+/**
+ * \brief This function initializes an RSA context.
+ *
+ * \note This function initializes the padding and the hash
+ * identifier to respectively #MBEDTLS_RSA_PKCS_V15 and
+ * #MBEDTLS_MD_NONE. See mbedtls_rsa_set_padding() for more
+ * information about those parameters.
+ *
+ * \param ctx The RSA context to initialize. This must not be \c NULL.
+ */
+void mbedtls_rsa_init( mbedtls_rsa_context *ctx );
+
+/**
+ * \brief This function sets padding for an already initialized RSA
+ * context.
+ *
+ * \note Set padding to #MBEDTLS_RSA_PKCS_V21 for the RSAES-OAEP
+ * encryption scheme and the RSASSA-PSS signature scheme.
+ *
+ * \note The \p hash_id parameter is ignored when using
+ * #MBEDTLS_RSA_PKCS_V15 padding.
+ *
+ * \note The choice of padding mode is strictly enforced for private
+ * key operations, since there might be security concerns in
+ * mixing padding modes. For public key operations it is
+ * a default value, which can be overridden by calling specific
+ * \c mbedtls_rsa_rsaes_xxx or \c mbedtls_rsa_rsassa_xxx
+ * functions.
+ *
+ * \note The hash selected in \p hash_id is always used for OEAP
+ * encryption. For PSS signatures, it is always used for
+ * making signatures, but can be overridden for verifying them.
+ * If set to #MBEDTLS_MD_NONE, it is always overridden.
+ *
+ * \param ctx The initialized RSA context to be configured.
+ * \param padding The padding mode to use. This must be either
+ * #MBEDTLS_RSA_PKCS_V15 or #MBEDTLS_RSA_PKCS_V21.
+ * \param hash_id The hash identifier for PSS or OAEP, if \p padding is
+ * #MBEDTLS_RSA_PKCS_V21. #MBEDTLS_MD_NONE is accepted by this
+ * function but may be not suitable for some operations.
+ * Ignored if \p padding is #MBEDTLS_RSA_PKCS_V15.
+ *
+ * \return \c 0 on success.
+ * \return #MBEDTLS_ERR_RSA_INVALID_PADDING failure:
+ * \p padding or \p hash_id is invalid.
+ */
+int mbedtls_rsa_set_padding( mbedtls_rsa_context *ctx, int padding,
+ mbedtls_md_type_t hash_id );
+
+/**
+ * \brief This function imports a set of core parameters into an
+ * RSA context.
+ *
+ * \note This function can be called multiple times for successive
+ * imports, if the parameters are not simultaneously present.
+ *
+ * Any sequence of calls to this function should be followed
+ * by a call to mbedtls_rsa_complete(), which checks and
+ * completes the provided information to a ready-for-use
+ * public or private RSA key.
+ *
+ * \note See mbedtls_rsa_complete() for more information on which
+ * parameters are necessary to set up a private or public
+ * RSA key.
+ *
+ * \note The imported parameters are copied and need not be preserved
+ * for the lifetime of the RSA context being set up.
+ *
+ * \param ctx The initialized RSA context to store the parameters in.
+ * \param N The RSA modulus. This may be \c NULL.
+ * \param P The first prime factor of \p N. This may be \c NULL.
+ * \param Q The second prime factor of \p N. This may be \c NULL.
+ * \param D The private exponent. This may be \c NULL.
+ * \param E The public exponent. This may be \c NULL.
+ *
+ * \return \c 0 on success.
+ * \return A non-zero error code on failure.
+ */
+int mbedtls_rsa_import( mbedtls_rsa_context *ctx,
+ const mbedtls_mpi *N,
+ const mbedtls_mpi *P, const mbedtls_mpi *Q,
+ const mbedtls_mpi *D, const mbedtls_mpi *E );
+
+/**
+ * \brief This function imports core RSA parameters, in raw big-endian
+ * binary format, into an RSA context.
+ *
+ * \note This function can be called multiple times for successive
+ * imports, if the parameters are not simultaneously present.
+ *
+ * Any sequence of calls to this function should be followed
+ * by a call to mbedtls_rsa_complete(), which checks and
+ * completes the provided information to a ready-for-use
+ * public or private RSA key.
+ *
+ * \note See mbedtls_rsa_complete() for more information on which
+ * parameters are necessary to set up a private or public
+ * RSA key.
+ *
+ * \note The imported parameters are copied and need not be preserved
+ * for the lifetime of the RSA context being set up.
+ *
+ * \param ctx The initialized RSA context to store the parameters in.
+ * \param N The RSA modulus. This may be \c NULL.
+ * \param N_len The Byte length of \p N; it is ignored if \p N == NULL.
+ * \param P The first prime factor of \p N. This may be \c NULL.
+ * \param P_len The Byte length of \p P; it ns ignored if \p P == NULL.
+ * \param Q The second prime factor of \p N. This may be \c NULL.
+ * \param Q_len The Byte length of \p Q; it is ignored if \p Q == NULL.
+ * \param D The private exponent. This may be \c NULL.
+ * \param D_len The Byte length of \p D; it is ignored if \p D == NULL.
+ * \param E The public exponent. This may be \c NULL.
+ * \param E_len The Byte length of \p E; it is ignored if \p E == NULL.
+ *
+ * \return \c 0 on success.
+ * \return A non-zero error code on failure.
+ */
+int mbedtls_rsa_import_raw( mbedtls_rsa_context *ctx,
+ unsigned char const *N, size_t N_len,
+ unsigned char const *P, size_t P_len,
+ unsigned char const *Q, size_t Q_len,
+ unsigned char const *D, size_t D_len,
+ unsigned char const *E, size_t E_len );
+
+/**
+ * \brief This function completes an RSA context from
+ * a set of imported core parameters.
+ *
+ * To setup an RSA public key, precisely \p N and \p E
+ * must have been imported.
+ *
+ * To setup an RSA private key, sufficient information must
+ * be present for the other parameters to be derivable.
+ *
+ * The default implementation supports the following:
+ * <ul><li>Derive \p P, \p Q from \p N, \p D, \p E.</li>
+ * <li>Derive \p N, \p D from \p P, \p Q, \p E.</li></ul>
+ * Alternative implementations need not support these.
+ *
+ * If this function runs successfully, it guarantees that
+ * the RSA context can be used for RSA operations without
+ * the risk of failure or crash.
+ *
+ * \warning This function need not perform consistency checks
+ * for the imported parameters. In particular, parameters that
+ * are not needed by the implementation might be silently
+ * discarded and left unchecked. To check the consistency
+ * of the key material, see mbedtls_rsa_check_privkey().
+ *
+ * \param ctx The initialized RSA context holding imported parameters.
+ *
+ * \return \c 0 on success.
+ * \return #MBEDTLS_ERR_RSA_BAD_INPUT_DATA if the attempted derivations
+ * failed.
+ *
+ */
+int mbedtls_rsa_complete( mbedtls_rsa_context *ctx );
+
+/**
+ * \brief This function exports the core parameters of an RSA key.
+ *
+ * If this function runs successfully, the non-NULL buffers
+ * pointed to by \p N, \p P, \p Q, \p D, and \p E are fully
+ * written, with additional unused space filled leading by
+ * zero Bytes.
+ *
+ * Possible reasons for returning
+ * #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED:<ul>
+ * <li>An alternative RSA implementation is in use, which
+ * stores the key externally, and either cannot or should
+ * not export it into RAM.</li>
+ * <li>A SW or HW implementation might not support a certain
+ * deduction. For example, \p P, \p Q from \p N, \p D,
+ * and \p E if the former are not part of the
+ * implementation.</li></ul>
+ *
+ * If the function fails due to an unsupported operation,
+ * the RSA context stays intact and remains usable.
+ *
+ * \param ctx The initialized RSA context.
+ * \param N The MPI to hold the RSA modulus.
+ * This may be \c NULL if this field need not be exported.
+ * \param P The MPI to hold the first prime factor of \p N.
+ * This may be \c NULL if this field need not be exported.
+ * \param Q The MPI to hold the second prime factor of \p N.
+ * This may be \c NULL if this field need not be exported.
+ * \param D The MPI to hold the private exponent.
+ * This may be \c NULL if this field need not be exported.
+ * \param E The MPI to hold the public exponent.
+ * This may be \c NULL if this field need not be exported.
+ *
+ * \return \c 0 on success.
+ * \return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED if exporting the
+ * requested parameters cannot be done due to missing
+ * functionality or because of security policies.
+ * \return A non-zero return code on any other failure.
+ *
+ */
+int mbedtls_rsa_export( const mbedtls_rsa_context *ctx,
+ mbedtls_mpi *N, mbedtls_mpi *P, mbedtls_mpi *Q,
+ mbedtls_mpi *D, mbedtls_mpi *E );
+
+/**
+ * \brief This function exports core parameters of an RSA key
+ * in raw big-endian binary format.
+ *
+ * If this function runs successfully, the non-NULL buffers
+ * pointed to by \p N, \p P, \p Q, \p D, and \p E are fully
+ * written, with additional unused space filled leading by
+ * zero Bytes.
+ *
+ * Possible reasons for returning
+ * #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED:<ul>
+ * <li>An alternative RSA implementation is in use, which
+ * stores the key externally, and either cannot or should
+ * not export it into RAM.</li>
+ * <li>A SW or HW implementation might not support a certain
+ * deduction. For example, \p P, \p Q from \p N, \p D,
+ * and \p E if the former are not part of the
+ * implementation.</li></ul>
+ * If the function fails due to an unsupported operation,
+ * the RSA context stays intact and remains usable.
+ *
+ * \note The length parameters are ignored if the corresponding
+ * buffer pointers are NULL.
+ *
+ * \param ctx The initialized RSA context.
+ * \param N The Byte array to store the RSA modulus,
+ * or \c NULL if this field need not be exported.
+ * \param N_len The size of the buffer for the modulus.
+ * \param P The Byte array to hold the first prime factor of \p N,
+ * or \c NULL if this field need not be exported.
+ * \param P_len The size of the buffer for the first prime factor.
+ * \param Q The Byte array to hold the second prime factor of \p N,
+ * or \c NULL if this field need not be exported.
+ * \param Q_len The size of the buffer for the second prime factor.
+ * \param D The Byte array to hold the private exponent,
+ * or \c NULL if this field need not be exported.
+ * \param D_len The size of the buffer for the private exponent.
+ * \param E The Byte array to hold the public exponent,
+ * or \c NULL if this field need not be exported.
+ * \param E_len The size of the buffer for the public exponent.
+ *
+ * \return \c 0 on success.
+ * \return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED if exporting the
+ * requested parameters cannot be done due to missing
+ * functionality or because of security policies.
+ * \return A non-zero return code on any other failure.
+ */
+int mbedtls_rsa_export_raw( const mbedtls_rsa_context *ctx,
+ unsigned char *N, size_t N_len,
+ unsigned char *P, size_t P_len,
+ unsigned char *Q, size_t Q_len,
+ unsigned char *D, size_t D_len,
+ unsigned char *E, size_t E_len );
+
+/**
+ * \brief This function exports CRT parameters of a private RSA key.
+ *
+ * \note Alternative RSA implementations not using CRT-parameters
+ * internally can implement this function based on
+ * mbedtls_rsa_deduce_opt().
+ *
+ * \param ctx The initialized RSA context.
+ * \param DP The MPI to hold \c D modulo `P-1`,
+ * or \c NULL if it need not be exported.
+ * \param DQ The MPI to hold \c D modulo `Q-1`,
+ * or \c NULL if it need not be exported.
+ * \param QP The MPI to hold modular inverse of \c Q modulo \c P,
+ * or \c NULL if it need not be exported.
+ *
+ * \return \c 0 on success.
+ * \return A non-zero error code on failure.
+ *
+ */
+int mbedtls_rsa_export_crt( const mbedtls_rsa_context *ctx,
+ mbedtls_mpi *DP, mbedtls_mpi *DQ, mbedtls_mpi *QP );
+
+/**
+ * \brief This function retrieves the length of RSA modulus in Bytes.
+ *
+ * \param ctx The initialized RSA context.
+ *
+ * \return The length of the RSA modulus in Bytes.
+ *
+ */
+size_t mbedtls_rsa_get_len( const mbedtls_rsa_context *ctx );
+
+/**
+ * \brief This function generates an RSA keypair.
+ *
+ * \note mbedtls_rsa_init() must be called before this function,
+ * to set up the RSA context.
+ *
+ * \param ctx The initialized RSA context used to hold the key.
+ * \param f_rng The RNG function to be used for key generation.
+ * This is mandatory and must not be \c NULL.
+ * \param p_rng The RNG context to be passed to \p f_rng.
+ * This may be \c NULL if \p f_rng doesn't need a context.
+ * \param nbits The size of the public key in bits.
+ * \param exponent The public exponent to use. For example, \c 65537.
+ * This must be odd and greater than \c 1.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_gen_key( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ unsigned int nbits, int exponent );
+
+/**
+ * \brief This function checks if a context contains at least an RSA
+ * public key.
+ *
+ * If the function runs successfully, it is guaranteed that
+ * enough information is present to perform an RSA public key
+ * operation using mbedtls_rsa_public().
+ *
+ * \param ctx The initialized RSA context to check.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ *
+ */
+int mbedtls_rsa_check_pubkey( const mbedtls_rsa_context *ctx );
+
+/**
+ * \brief This function checks if a context contains an RSA private key
+ * and perform basic consistency checks.
+ *
+ * \note The consistency checks performed by this function not only
+ * ensure that mbedtls_rsa_private() can be called successfully
+ * on the given context, but that the various parameters are
+ * mutually consistent with high probability, in the sense that
+ * mbedtls_rsa_public() and mbedtls_rsa_private() are inverses.
+ *
+ * \warning This function should catch accidental misconfigurations
+ * like swapping of parameters, but it cannot establish full
+ * trust in neither the quality nor the consistency of the key
+ * material that was used to setup the given RSA context:
+ * <ul><li>Consistency: Imported parameters that are irrelevant
+ * for the implementation might be silently dropped. If dropped,
+ * the current function does not have access to them,
+ * and therefore cannot check them. See mbedtls_rsa_complete().
+ * If you want to check the consistency of the entire
+ * content of an PKCS1-encoded RSA private key, for example, you
+ * should use mbedtls_rsa_validate_params() before setting
+ * up the RSA context.
+ * Additionally, if the implementation performs empirical checks,
+ * these checks substantiate but do not guarantee consistency.</li>
+ * <li>Quality: This function is not expected to perform
+ * extended quality assessments like checking that the prime
+ * factors are safe. Additionally, it is the responsibility of the
+ * user to ensure the trustworthiness of the source of his RSA
+ * parameters, which goes beyond what is effectively checkable
+ * by the library.</li></ul>
+ *
+ * \param ctx The initialized RSA context to check.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_check_privkey( const mbedtls_rsa_context *ctx );
+
+/**
+ * \brief This function checks a public-private RSA key pair.
+ *
+ * It checks each of the contexts, and makes sure they match.
+ *
+ * \param pub The initialized RSA context holding the public key.
+ * \param prv The initialized RSA context holding the private key.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_check_pub_priv( const mbedtls_rsa_context *pub,
+ const mbedtls_rsa_context *prv );
+
+/**
+ * \brief This function performs an RSA public key operation.
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param input The input buffer. This must be a readable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ * \param output The output buffer. This must be a writable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ *
+ * \note This function does not handle message padding.
+ *
+ * \note Make sure to set \p input[0] = 0 or ensure that
+ * input is smaller than \p N.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_public( mbedtls_rsa_context *ctx,
+ const unsigned char *input,
+ unsigned char *output );
+
+/**
+ * \brief This function performs an RSA private key operation.
+ *
+ * \note Blinding is used if and only if a PRNG is provided.
+ *
+ * \note If blinding is used, both the base of exponentation
+ * and the exponent are blinded, providing protection
+ * against some side-channel attacks.
+ *
+ * \warning It is deprecated and a security risk to not provide
+ * a PRNG here and thereby prevent the use of blinding.
+ * Future versions of the library may enforce the presence
+ * of a PRNG.
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG function, used for blinding. It is mandatory.
+ * \param p_rng The RNG context to pass to \p f_rng. This may be \c NULL
+ * if \p f_rng doesn't need a context.
+ * \param input The input buffer. This must be a readable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ * \param output The output buffer. This must be a writable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ *
+ */
+int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ const unsigned char *input,
+ unsigned char *output );
+
+/**
+ * \brief This function adds the message padding, then performs an RSA
+ * operation.
+ *
+ * It is the generic wrapper for performing a PKCS#1 encryption
+ * operation.
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG to use. It is used for padding generation
+ * and it is mandatory.
+ * \param p_rng The RNG context to be passed to \p f_rng. May be
+ * \c NULL if \p f_rng doesn't need a context argument.
+ * \param ilen The length of the plaintext in Bytes.
+ * \param input The input data to encrypt. This must be a readable
+ * buffer of size \p ilen Bytes. It may be \c NULL if
+ * `ilen == 0`.
+ * \param output The output buffer. This must be a writable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_pkcs1_encrypt( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ size_t ilen,
+ const unsigned char *input,
+ unsigned char *output );
+
+/**
+ * \brief This function performs a PKCS#1 v1.5 encryption operation
+ * (RSAES-PKCS1-v1_5-ENCRYPT).
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG function to use. It is mandatory and used for
+ * padding generation.
+ * \param p_rng The RNG context to be passed to \p f_rng. This may
+ * be \c NULL if \p f_rng doesn't need a context argument.
+ * \param ilen The length of the plaintext in Bytes.
+ * \param input The input data to encrypt. This must be a readable
+ * buffer of size \p ilen Bytes. It may be \c NULL if
+ * `ilen == 0`.
+ * \param output The output buffer. This must be a writable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_rsaes_pkcs1_v15_encrypt( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ size_t ilen,
+ const unsigned char *input,
+ unsigned char *output );
+
+/**
+ * \brief This function performs a PKCS#1 v2.1 OAEP encryption
+ * operation (RSAES-OAEP-ENCRYPT).
+ *
+ * \note The output buffer must be as large as the size
+ * of ctx->N. For example, 128 Bytes if RSA-1024 is used.
+ *
+ * \param ctx The initnialized RSA context to use.
+ * \param f_rng The RNG function to use. This is needed for padding
+ * generation and is mandatory.
+ * \param p_rng The RNG context to be passed to \p f_rng. This may
+ * be \c NULL if \p f_rng doesn't need a context argument.
+ * \param label The buffer holding the custom label to use.
+ * This must be a readable buffer of length \p label_len
+ * Bytes. It may be \c NULL if \p label_len is \c 0.
+ * \param label_len The length of the label in Bytes.
+ * \param ilen The length of the plaintext buffer \p input in Bytes.
+ * \param input The input data to encrypt. This must be a readable
+ * buffer of size \p ilen Bytes. It may be \c NULL if
+ * `ilen == 0`.
+ * \param output The output buffer. This must be a writable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_rsaes_oaep_encrypt( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ const unsigned char *label, size_t label_len,
+ size_t ilen,
+ const unsigned char *input,
+ unsigned char *output );
+
+/**
+ * \brief This function performs an RSA operation, then removes the
+ * message padding.
+ *
+ * It is the generic wrapper for performing a PKCS#1 decryption
+ * operation.
+ *
+ * \note The output buffer length \c output_max_len should be
+ * as large as the size \p ctx->len of \p ctx->N (for example,
+ * 128 Bytes if RSA-1024 is used) to be able to hold an
+ * arbitrary decrypted message. If it is not large enough to
+ * hold the decryption of the particular ciphertext provided,
+ * the function returns \c MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE.
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG function. This is used for blinding and is
+ * mandatory; see mbedtls_rsa_private() for more.
+ * \param p_rng The RNG context to be passed to \p f_rng. This may be
+ * \c NULL if \p f_rng doesn't need a context.
+ * \param olen The address at which to store the length of
+ * the plaintext. This must not be \c NULL.
+ * \param input The ciphertext buffer. This must be a readable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ * \param output The buffer used to hold the plaintext. This must
+ * be a writable buffer of length \p output_max_len Bytes.
+ * \param output_max_len The length in Bytes of the output buffer \p output.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_pkcs1_decrypt( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ size_t *olen,
+ const unsigned char *input,
+ unsigned char *output,
+ size_t output_max_len );
+
+/**
+ * \brief This function performs a PKCS#1 v1.5 decryption
+ * operation (RSAES-PKCS1-v1_5-DECRYPT).
+ *
+ * \note The output buffer length \c output_max_len should be
+ * as large as the size \p ctx->len of \p ctx->N, for example,
+ * 128 Bytes if RSA-1024 is used, to be able to hold an
+ * arbitrary decrypted message. If it is not large enough to
+ * hold the decryption of the particular ciphertext provided,
+ * the function returns #MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE.
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG function. This is used for blinding and is
+ * mandatory; see mbedtls_rsa_private() for more.
+ * \param p_rng The RNG context to be passed to \p f_rng. This may be
+ * \c NULL if \p f_rng doesn't need a context.
+ * \param olen The address at which to store the length of
+ * the plaintext. This must not be \c NULL.
+ * \param input The ciphertext buffer. This must be a readable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ * \param output The buffer used to hold the plaintext. This must
+ * be a writable buffer of length \p output_max_len Bytes.
+ * \param output_max_len The length in Bytes of the output buffer \p output.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ *
+ */
+int mbedtls_rsa_rsaes_pkcs1_v15_decrypt( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ size_t *olen,
+ const unsigned char *input,
+ unsigned char *output,
+ size_t output_max_len );
+
+/**
+ * \brief This function performs a PKCS#1 v2.1 OAEP decryption
+ * operation (RSAES-OAEP-DECRYPT).
+ *
+ * \note The output buffer length \c output_max_len should be
+ * as large as the size \p ctx->len of \p ctx->N, for
+ * example, 128 Bytes if RSA-1024 is used, to be able to
+ * hold an arbitrary decrypted message. If it is not
+ * large enough to hold the decryption of the particular
+ * ciphertext provided, the function returns
+ * #MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE.
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG function. This is used for blinding and is
+ * mandatory.
+ * \param p_rng The RNG context to be passed to \p f_rng. This may be
+ * \c NULL if \p f_rng doesn't need a context.
+ * \param label The buffer holding the custom label to use.
+ * This must be a readable buffer of length \p label_len
+ * Bytes. It may be \c NULL if \p label_len is \c 0.
+ * \param label_len The length of the label in Bytes.
+ * \param olen The address at which to store the length of
+ * the plaintext. This must not be \c NULL.
+ * \param input The ciphertext buffer. This must be a readable buffer
+ * of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ * \param output The buffer used to hold the plaintext. This must
+ * be a writable buffer of length \p output_max_len Bytes.
+ * \param output_max_len The length in Bytes of the output buffer \p output.
+ *
+ * \return \c 0 on success.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_rsaes_oaep_decrypt( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ const unsigned char *label, size_t label_len,
+ size_t *olen,
+ const unsigned char *input,
+ unsigned char *output,
+ size_t output_max_len );
+
+/**
+ * \brief This function performs a private RSA operation to sign
+ * a message digest using PKCS#1.
+ *
+ * It is the generic wrapper for performing a PKCS#1
+ * signature.
+ *
+ * \note The \p sig buffer must be as large as the size
+ * of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
+ *
+ * \note For PKCS#1 v2.1 encoding, see comments on
+ * mbedtls_rsa_rsassa_pss_sign() for details on
+ * \p md_alg and \p hash_id.
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG function to use. This is mandatory and
+ * must not be \c NULL.
+ * \param p_rng The RNG context to be passed to \p f_rng. This may be \c NULL
+ * if \p f_rng doesn't need a context argument.
+ * \param md_alg The message-digest algorithm used to hash the original data.
+ * Use #MBEDTLS_MD_NONE for signing raw data.
+ * \param hashlen The length of the message digest or raw data in Bytes.
+ * If \p md_alg is not #MBEDTLS_MD_NONE, this must match the
+ * output length of the corresponding hash algorithm.
+ * \param hash The buffer holding the message digest or raw data.
+ * This must be a readable buffer of at least \p hashlen Bytes.
+ * \param sig The buffer to hold the signature. This must be a writable
+ * buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus. A buffer length of
+ * #MBEDTLS_MPI_MAX_SIZE is always safe.
+ *
+ * \return \c 0 if the signing operation was successful.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_pkcs1_sign( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ mbedtls_md_type_t md_alg,
+ unsigned int hashlen,
+ const unsigned char *hash,
+ unsigned char *sig );
+
+/**
+ * \brief This function performs a PKCS#1 v1.5 signature
+ * operation (RSASSA-PKCS1-v1_5-SIGN).
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG function. This is used for blinding and is
+ * mandatory; see mbedtls_rsa_private() for more.
+ * \param p_rng The RNG context to be passed to \p f_rng. This may be \c NULL
+ * if \p f_rng doesn't need a context argument.
+ * \param md_alg The message-digest algorithm used to hash the original data.
+ * Use #MBEDTLS_MD_NONE for signing raw data.
+ * \param hashlen The length of the message digest or raw data in Bytes.
+ * If \p md_alg is not #MBEDTLS_MD_NONE, this must match the
+ * output length of the corresponding hash algorithm.
+ * \param hash The buffer holding the message digest or raw data.
+ * This must be a readable buffer of at least \p hashlen Bytes.
+ * \param sig The buffer to hold the signature. This must be a writable
+ * buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus. A buffer length of
+ * #MBEDTLS_MPI_MAX_SIZE is always safe.
+ *
+ * \return \c 0 if the signing operation was successful.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ mbedtls_md_type_t md_alg,
+ unsigned int hashlen,
+ const unsigned char *hash,
+ unsigned char *sig );
+
+/**
+ * \brief This function performs a PKCS#1 v2.1 PSS signature
+ * operation (RSASSA-PSS-SIGN).
+ *
+ * \note The \c hash_id set in \p ctx by calling
+ * mbedtls_rsa_set_padding() selects the hash used for the
+ * encoding operation and for the mask generation function
+ * (MGF1). For more details on the encoding operation and the
+ * mask generation function, consult <em>RFC-3447: Public-Key
+ * Cryptography Standards (PKCS) #1 v2.1: RSA Cryptography
+ * Specifications</em>.
+ *
+ * \note This function enforces that the provided salt length complies
+ * with FIPS 186-4 §5.5 (e) and RFC 8017 (PKCS#1 v2.2) §9.1.1
+ * step 3. The constraint is that the hash length plus the salt
+ * length plus 2 bytes must be at most the key length. If this
+ * constraint is not met, this function returns
+ * #MBEDTLS_ERR_RSA_BAD_INPUT_DATA.
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG function. It is mandatory and must not be \c NULL.
+ * \param p_rng The RNG context to be passed to \p f_rng. This may be \c NULL
+ * if \p f_rng doesn't need a context argument.
+ * \param md_alg The message-digest algorithm used to hash the original data.
+ * Use #MBEDTLS_MD_NONE for signing raw data.
+ * \param hashlen The length of the message digest or raw data in Bytes.
+ * If \p md_alg is not #MBEDTLS_MD_NONE, this must match the
+ * output length of the corresponding hash algorithm.
+ * \param hash The buffer holding the message digest or raw data.
+ * This must be a readable buffer of at least \p hashlen Bytes.
+ * \param saltlen The length of the salt that should be used.
+ * If passed #MBEDTLS_RSA_SALT_LEN_ANY, the function will use
+ * the largest possible salt length up to the hash length,
+ * which is the largest permitted by some standards including
+ * FIPS 186-4 §5.5.
+ * \param sig The buffer to hold the signature. This must be a writable
+ * buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus. A buffer length of
+ * #MBEDTLS_MPI_MAX_SIZE is always safe.
+ *
+ * \return \c 0 if the signing operation was successful.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_rsassa_pss_sign_ext( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ mbedtls_md_type_t md_alg,
+ unsigned int hashlen,
+ const unsigned char *hash,
+ int saltlen,
+ unsigned char *sig );
+
+/**
+ * \brief This function performs a PKCS#1 v2.1 PSS signature
+ * operation (RSASSA-PSS-SIGN).
+ *
+ * \note The \c hash_id set in \p ctx by calling
+ * mbedtls_rsa_set_padding() selects the hash used for the
+ * encoding operation and for the mask generation function
+ * (MGF1). For more details on the encoding operation and the
+ * mask generation function, consult <em>RFC-3447: Public-Key
+ * Cryptography Standards (PKCS) #1 v2.1: RSA Cryptography
+ * Specifications</em>.
+ *
+ * \note This function always uses the maximum possible salt size,
+ * up to the length of the payload hash. This choice of salt
+ * size complies with FIPS 186-4 §5.5 (e) and RFC 8017 (PKCS#1
+ * v2.2) §9.1.1 step 3. Furthermore this function enforces a
+ * minimum salt size which is the hash size minus 2 bytes. If
+ * this minimum size is too large given the key size (the salt
+ * size, plus the hash size, plus 2 bytes must be no more than
+ * the key size in bytes), this function returns
+ * #MBEDTLS_ERR_RSA_BAD_INPUT_DATA.
+ *
+ * \param ctx The initialized RSA context to use.
+ * \param f_rng The RNG function. It is mandatory and must not be \c NULL.
+ * \param p_rng The RNG context to be passed to \p f_rng. This may be \c NULL
+ * if \p f_rng doesn't need a context argument.
+ * \param md_alg The message-digest algorithm used to hash the original data.
+ * Use #MBEDTLS_MD_NONE for signing raw data.
+ * \param hashlen The length of the message digest or raw data in Bytes.
+ * If \p md_alg is not #MBEDTLS_MD_NONE, this must match the
+ * output length of the corresponding hash algorithm.
+ * \param hash The buffer holding the message digest or raw data.
+ * This must be a readable buffer of at least \p hashlen Bytes.
+ * \param sig The buffer to hold the signature. This must be a writable
+ * buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus. A buffer length of
+ * #MBEDTLS_MPI_MAX_SIZE is always safe.
+ *
+ * \return \c 0 if the signing operation was successful.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_rsassa_pss_sign( mbedtls_rsa_context *ctx,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng,
+ mbedtls_md_type_t md_alg,
+ unsigned int hashlen,
+ const unsigned char *hash,
+ unsigned char *sig );
+
+/**
+ * \brief This function performs a public RSA operation and checks
+ * the message digest.
+ *
+ * This is the generic wrapper for performing a PKCS#1
+ * verification.
+ *
+ * \note For PKCS#1 v2.1 encoding, see comments on
+ * mbedtls_rsa_rsassa_pss_verify() about \p md_alg and
+ * \p hash_id.
+ *
+ * \param ctx The initialized RSA public key context to use.
+ * \param md_alg The message-digest algorithm used to hash the original data.
+ * Use #MBEDTLS_MD_NONE for signing raw data.
+ * \param hashlen The length of the message digest or raw data in Bytes.
+ * If \p md_alg is not #MBEDTLS_MD_NONE, this must match the
+ * output length of the corresponding hash algorithm.
+ * \param hash The buffer holding the message digest or raw data.
+ * This must be a readable buffer of at least \p hashlen Bytes.
+ * \param sig The buffer holding the signature. This must be a readable
+ * buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ *
+ * \return \c 0 if the verify operation was successful.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_pkcs1_verify( mbedtls_rsa_context *ctx,
+ mbedtls_md_type_t md_alg,
+ unsigned int hashlen,
+ const unsigned char *hash,
+ const unsigned char *sig );
+
+/**
+ * \brief This function performs a PKCS#1 v1.5 verification
+ * operation (RSASSA-PKCS1-v1_5-VERIFY).
+ *
+ * \param ctx The initialized RSA public key context to use.
+ * \param md_alg The message-digest algorithm used to hash the original data.
+ * Use #MBEDTLS_MD_NONE for signing raw data.
+ * \param hashlen The length of the message digest or raw data in Bytes.
+ * If \p md_alg is not #MBEDTLS_MD_NONE, this must match the
+ * output length of the corresponding hash algorithm.
+ * \param hash The buffer holding the message digest or raw data.
+ * This must be a readable buffer of at least \p hashlen Bytes.
+ * \param sig The buffer holding the signature. This must be a readable
+ * buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ *
+ * \return \c 0 if the verify operation was successful.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_rsassa_pkcs1_v15_verify( mbedtls_rsa_context *ctx,
+ mbedtls_md_type_t md_alg,
+ unsigned int hashlen,
+ const unsigned char *hash,
+ const unsigned char *sig );
+
+/**
+ * \brief This function performs a PKCS#1 v2.1 PSS verification
+ * operation (RSASSA-PSS-VERIFY).
+ *
+ * \note The \c hash_id set in \p ctx by calling
+ * mbedtls_rsa_set_padding() selects the hash used for the
+ * encoding operation and for the mask generation function
+ * (MGF1). For more details on the encoding operation and the
+ * mask generation function, consult <em>RFC-3447: Public-Key
+ * Cryptography Standards (PKCS) #1 v2.1: RSA Cryptography
+ * Specifications</em>. If the \c hash_id set in \p ctx by
+ * mbedtls_rsa_set_padding() is #MBEDTLS_MD_NONE, the \p md_alg
+ * parameter is used.
+ *
+ * \param ctx The initialized RSA public key context to use.
+ * \param md_alg The message-digest algorithm used to hash the original data.
+ * Use #MBEDTLS_MD_NONE for signing raw data.
+ * \param hashlen The length of the message digest or raw data in Bytes.
+ * If \p md_alg is not #MBEDTLS_MD_NONE, this must match the
+ * output length of the corresponding hash algorithm.
+ * \param hash The buffer holding the message digest or raw data.
+ * This must be a readable buffer of at least \p hashlen Bytes.
+ * \param sig The buffer holding the signature. This must be a readable
+ * buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ *
+ * \return \c 0 if the verify operation was successful.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_rsassa_pss_verify( mbedtls_rsa_context *ctx,
+ mbedtls_md_type_t md_alg,
+ unsigned int hashlen,
+ const unsigned char *hash,
+ const unsigned char *sig );
+
+/**
+ * \brief This function performs a PKCS#1 v2.1 PSS verification
+ * operation (RSASSA-PSS-VERIFY).
+ *
+ * \note The \p sig buffer must be as large as the size
+ * of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
+ *
+ * \note The \c hash_id set in \p ctx by mbedtls_rsa_set_padding() is
+ * ignored.
+ *
+ * \param ctx The initialized RSA public key context to use.
+ * \param md_alg The message-digest algorithm used to hash the original data.
+ * Use #MBEDTLS_MD_NONE for signing raw data.
+ * \param hashlen The length of the message digest or raw data in Bytes.
+ * If \p md_alg is not #MBEDTLS_MD_NONE, this must match the
+ * output length of the corresponding hash algorithm.
+ * \param hash The buffer holding the message digest or raw data.
+ * This must be a readable buffer of at least \p hashlen Bytes.
+ * \param mgf1_hash_id The message digest algorithm used for the
+ * verification operation and the mask generation
+ * function (MGF1). For more details on the encoding
+ * operation and the mask generation function, consult
+ * <em>RFC-3447: Public-Key Cryptography Standards
+ * (PKCS) #1 v2.1: RSA Cryptography
+ * Specifications</em>.
+ * \param expected_salt_len The length of the salt used in padding. Use
+ * #MBEDTLS_RSA_SALT_LEN_ANY to accept any salt length.
+ * \param sig The buffer holding the signature. This must be a readable
+ * buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
+ * for an 2048-bit RSA modulus.
+ *
+ * \return \c 0 if the verify operation was successful.
+ * \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
+ */
+int mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_rsa_context *ctx,
+ mbedtls_md_type_t md_alg,
+ unsigned int hashlen,
+ const unsigned char *hash,
+ mbedtls_md_type_t mgf1_hash_id,
+ int expected_salt_len,
+ const unsigned char *sig );
+
+/**
+ * \brief This function copies the components of an RSA context.
+ *
+ * \param dst The destination context. This must be initialized.
+ * \param src The source context. This must be initialized.
+ *
+ * \return \c 0 on success.
+ * \return #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory allocation failure.
+ */
+int mbedtls_rsa_copy( mbedtls_rsa_context *dst, const mbedtls_rsa_context *src );
+
+/**
+ * \brief This function frees the components of an RSA key.
+ *
+ * \param ctx The RSA context to free. May be \c NULL, in which case
+ * this function is a no-op. If it is not \c NULL, it must
+ * point to an initialized RSA context.
+ */
+void mbedtls_rsa_free( mbedtls_rsa_context *ctx );
+
+#if defined(MBEDTLS_SELF_TEST)
+
+/**
+ * \brief The RSA checkup routine.
+ *
+ * \return \c 0 on success.
+ * \return \c 1 on failure.
+ */
+int mbedtls_rsa_self_test( int verbose );
+
+#endif /* MBEDTLS_SELF_TEST */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* rsa.h */