apache / mynewt-documentation / 94c47ae2bc67c54a68d227abbb47c27ae97cc232 / . / versions / v1_4_0 / mynewt-core / crypto / mbedtls / include / mbedtls / rsa.h

/** | |

* \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 (C) 2006-2018, Arm Limited (or its affiliates), 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_RSA_H | |

#define MBEDTLS_RSA_H | |

#if !defined(MBEDTLS_CONFIG_FILE) | |

#include "config.h" | |

#else | |

#include MBEDTLS_CONFIG_FILE | |

#endif | |

#include "bignum.h" | |

#include "md.h" | |

#if defined(MBEDTLS_THREADING_C) | |

#include "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. */ | |

#define MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION -0x4500 /**< The implementation does not offer the requested operation, for example, because of security violations or lack of functionality. */ | |

#define MBEDTLS_ERR_RSA_HW_ACCEL_FAILED -0x4580 /**< RSA hardware accelerator failed. */ | |

/* | |

* RSA constants | |

*/ | |

#define MBEDTLS_RSA_PUBLIC 0 /**< Request private key operation. */ | |

#define MBEDTLS_RSA_PRIVATE 1 /**< Request public key operation. */ | |

#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. | |

* | |

* \note Direct manipulation of the members of this structure | |

* is deprecated. All manipulation should instead be done through | |

* the public interface functions. | |

*/ | |

typedef struct mbedtls_rsa_context | |

{ | |

int ver; /*!< Always 0.*/ | |

size_t len; /*!< The size of \p N in Bytes. */ | |

mbedtls_mpi N; /*!< The public modulus. */ | |

mbedtls_mpi E; /*!< The public exponent. */ | |

mbedtls_mpi D; /*!< The private exponent. */ | |

mbedtls_mpi P; /*!< The first prime factor. */ | |

mbedtls_mpi Q; /*!< The second prime factor. */ | |

mbedtls_mpi DP; /*!< <code>D % (P - 1)</code>. */ | |

mbedtls_mpi DQ; /*!< <code>D % (Q - 1)</code>. */ | |

mbedtls_mpi QP; /*!< <code>1 / (Q % P)</code>. */ | |

mbedtls_mpi RN; /*!< cached <code>R^2 mod N</code>. */ | |

mbedtls_mpi RP; /*!< cached <code>R^2 mod P</code>. */ | |

mbedtls_mpi RQ; /*!< cached <code>R^2 mod Q</code>. */ | |

mbedtls_mpi Vi; /*!< The cached blinding value. */ | |

mbedtls_mpi Vf; /*!< The cached un-blinding value. */ | |

int padding; /*!< Selects padding mode: | |

#MBEDTLS_RSA_PKCS_V15 for 1.5 padding and | |

#MBEDTLS_RSA_PKCS_V21 for OAEP or PSS. */ | |

int 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) | |

mbedtls_threading_mutex_t 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 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 overriden by calling specific | |

* \c rsa_rsaes_xxx or \c 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 overriden for verifying them. | |

* If set to #MBEDTLS_MD_NONE, it is always overriden. | |

* | |

* \param ctx The RSA context to initialize. | |

* \param padding Selects padding mode: #MBEDTLS_RSA_PKCS_V15 or | |

* #MBEDTLS_RSA_PKCS_V21. | |

* \param hash_id The hash identifier of #mbedtls_md_type_t type, if | |

* \p padding is #MBEDTLS_RSA_PKCS_V21. | |

*/ | |

void mbedtls_rsa_init( mbedtls_rsa_context *ctx, | |

int padding, | |

int 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, or NULL. | |

* \param P The first prime factor of \p N, or NULL. | |

* \param Q The second prime factor of \p N, or NULL. | |

* \param D The private exponent, or NULL. | |

* \param E The public exponent, or 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, or NULL. | |

* \param N_len The Byte length of \p N, ignored if \p N == NULL. | |

* \param P The first prime factor of \p N, or NULL. | |

* \param P_len The Byte length of \p P, ignored if \p P == NULL. | |

* \param Q The second prime factor of \p N, or NULL. | |

* \param Q_len The Byte length of \p Q, ignored if \p Q == NULL. | |

* \param D The private exponent, or NULL. | |

* \param D_len The Byte length of \p D, ignored if \p D == NULL. | |

* \param E The public exponent, or NULL. | |

* \param E_len The Byte length of \p E, 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_RSA_UNSUPPORTED_OPERATION:<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, or NULL. | |

* \param P The MPI to hold the first prime factor of \p N, or NULL. | |

* \param Q The MPI to hold the second prime factor of \p N, or NULL. | |

* \param D The MPI to hold the private exponent, or NULL. | |

* \param E The MPI to hold the public exponent, or NULL. | |

* | |

* \return \c 0 on success. | |

* \return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION 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_RSA_UNSUPPORTED_OPERATION:<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 NULL. | |

* \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 | |

* NULL. | |

* \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 | |

* NULL. | |

* \param Q_len The size of the buffer for the second prime factor. | |

* \param D The Byte array to hold the private exponent, or NULL. | |

* \param D_len The size of the buffer for the private exponent. | |

* \param E The Byte array to hold the public exponent, or NULL. | |

* \param E_len The size of the buffer for the public exponent. | |

* | |

* \return \c 0 on success. | |

* \return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION 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 D modulo P-1, or NULL. | |

* \param DQ The MPI to hold D modulo Q-1, or NULL. | |

* \param QP The MPI to hold modular inverse of Q modulo P, or NULL. | |

* | |

* \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 sets padding for an already initialized RSA | |

* context. See mbedtls_rsa_init() for details. | |

* | |

* \param ctx The RSA context to be set. | |

* \param padding Selects padding mode: #MBEDTLS_RSA_PKCS_V15 or | |

* #MBEDTLS_RSA_PKCS_V21. | |

* \param hash_id The #MBEDTLS_RSA_PKCS_V21 hash identifier. | |

*/ | |

void mbedtls_rsa_set_padding( mbedtls_rsa_context *ctx, int padding, | |

int hash_id); | |

/** | |

* \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 RSA context used to hold the key. | |

* \param f_rng The RNG function. | |

* \param p_rng The RNG context. | |

* \param nbits The size of the public key in bits. | |

* \param exponent The public exponent. For example, 65537. | |

* | |

* \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 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 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 RSA context holding the public key. | |

* \param prv The 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. | |

* | |

* \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. | |

* | |

* \note The input and output buffers must be large | |

* enough. For example, 128 Bytes if RSA-1024 is used. | |

* | |

* \param ctx The RSA context. | |

* \param input The input buffer. | |

* \param output The output buffer. | |

* | |

* \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 The input and output buffers must be large | |

* enough. For example, 128 Bytes if RSA-1024 is used. | |

* | |

* \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 RSA context. | |

* \param f_rng The RNG function. Needed for blinding. | |

* \param p_rng The RNG context. | |

* \param input The input buffer. | |

* \param output The output buffer. | |

* | |

* \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 using the \p mode from the context. | |

* | |

* \note The input and output buffers must be as large as the size | |

* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PUBLIC. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PRIVATE and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA context. | |

* \param f_rng The RNG function. Needed for padding, PKCS#1 v2.1 | |

* encoding, and #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \param ilen The length of the plaintext. | |

* \param input The buffer holding the data to encrypt. | |

* \param output The buffer used to hold the ciphertext. | |

* | |

* \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, | |

int mode, 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). | |

* | |

* \note The output buffer must be as large as the size | |

* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PUBLIC. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PRIVATE and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA context. | |

* \param f_rng The RNG function. Needed for padding and | |

* #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \param ilen The length of the plaintext. | |

* \param input The buffer holding the data to encrypt. | |

* \param output The buffer used to hold the ciphertext. | |

* | |

* \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, | |

int mode, 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. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PUBLIC. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PRIVATE and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA context. | |

* \param f_rng The RNG function. Needed for padding and PKCS#1 v2.1 | |

* encoding and #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \param label The buffer holding the custom label to use. | |

* \param label_len The length of the label. | |

* \param ilen The length of the plaintext. | |

* \param input The buffer holding the data to encrypt. | |

* \param output The buffer used to hold the ciphertext. | |

* | |

* \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, | |

int mode, | |

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 using the \p mode from the context. | |

* | |

* \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. | |

* | |

* \note The input buffer must be as large as the size | |

* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PRIVATE. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PUBLIC and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA context. | |

* \param f_rng The RNG function. Only needed for #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \param olen The length of the plaintext. | |

* \param input The buffer holding the encrypted data. | |

* \param output The buffer used to hold the plaintext. | |

* \param output_max_len The maximum length of the output buffer. | |

* | |

* \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, | |

int mode, 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. | |

* | |

* \note The input buffer must be as large as the size | |

* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PRIVATE. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PUBLIC and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA context. | |

* \param f_rng The RNG function. Only needed for #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \param olen The length of the plaintext. | |

* \param input The buffer holding the encrypted data. | |

* \param output The buffer to hold the plaintext. | |

* \param output_max_len The maximum length of the output buffer. | |

* | |

* \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, | |

int mode, 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. | |

* | |

* \note The input buffer must be as large as the size | |

* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PRIVATE. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PUBLIC and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA context. | |

* \param f_rng The RNG function. Only needed for #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \param label The buffer holding the custom label to use. | |

* \param label_len The length of the label. | |

* \param olen The length of the plaintext. | |

* \param input The buffer holding the encrypted data. | |

* \param output The buffer to hold the plaintext. | |

* \param output_max_len The maximum length of the output buffer. | |

* | |

* \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, | |

int mode, | |

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 using the \p mode from the context. | |

* | |

* \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. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PRIVATE. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PUBLIC and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA context. | |

* \param f_rng The RNG function. Needed for PKCS#1 v2.1 encoding and for | |

* #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \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. Only used if \p md_alg is #MBEDTLS_MD_NONE. | |

* \param hash The buffer holding the message digest. | |

* \param sig The buffer to hold the ciphertext. | |

* | |

* \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, | |

int mode, | |

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). | |

* | |

* \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. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PRIVATE. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PUBLIC and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA context. | |

* \param f_rng The RNG function. Only needed for #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \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. Only used if \p md_alg is #MBEDTLS_MD_NONE. | |

* \param hash The buffer holding the message digest. | |

* \param sig The buffer to hold the ciphertext. | |

* | |

* \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, | |

int mode, | |

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 \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 \p hash_id in the RSA context is the one used for the | |

* encoding. \p md_alg in the function call is the type of hash | |

* that is encoded. According to <em>RFC-3447: Public-Key | |

* Cryptography Standards (PKCS) #1 v2.1: RSA Cryptography | |

* Specifications</em> it is advised to keep both hashes the | |

* same. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PRIVATE. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PUBLIC and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA context. | |

* \param f_rng The RNG function. Needed for PKCS#1 v2.1 encoding and for | |

* #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \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. Only used if \p md_alg is #MBEDTLS_MD_NONE. | |

* \param hash The buffer holding the message digest. | |

* \param sig The buffer to hold the ciphertext. | |

* | |

* \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, | |

int mode, | |

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 using the mode from the context. | |

* | |

* \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_verify() about \p md_alg and | |

* \p hash_id. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* set to #MBEDTLS_RSA_PUBLIC. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PRIVATE and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA public key context. | |

* \param f_rng The RNG function. Only needed for #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \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. Only used if \p md_alg is #MBEDTLS_MD_NONE. | |

* \param hash The buffer holding the message digest. | |

* \param sig The buffer holding the ciphertext. | |

* | |

* \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, | |

int (*f_rng)(void *, unsigned char *, size_t), | |

void *p_rng, | |

int mode, | |

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). | |

* | |

* \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. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* set to #MBEDTLS_RSA_PUBLIC. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PRIVATE and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA public key context. | |

* \param f_rng The RNG function. Only needed for #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \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. Only used if \p md_alg is #MBEDTLS_MD_NONE. | |

* \param hash The buffer holding the message digest. | |

* \param sig The buffer holding the ciphertext. | |

* | |

* \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, | |

int (*f_rng)(void *, unsigned char *, size_t), | |

void *p_rng, | |

int mode, | |

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). | |

* | |

* The hash function for the MGF mask generating function | |

* is that specified in the RSA context. | |

* | |

* \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 \p hash_id in the RSA context is the one used for the | |

* verification. \p md_alg in the function call is the type of | |

* hash that is verified. According to <em>RFC-3447: Public-Key | |

* Cryptography Standards (PKCS) #1 v2.1: RSA Cryptography | |

* Specifications</em> it is advised to keep both hashes the | |

* same. If \p hash_id in the RSA context is unset, | |

* the \p md_alg from the function call is used. | |

* | |

* \deprecated It is deprecated and discouraged to call this function | |

* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library | |

* are likely to remove the \p mode argument and have it | |

* implicitly set to #MBEDTLS_RSA_PUBLIC. | |

* | |

* \note Alternative implementations of RSA need not support | |

* mode being set to #MBEDTLS_RSA_PRIVATE and might instead | |

* return #MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION. | |

* | |

* \param ctx The RSA public key context. | |

* \param f_rng The RNG function. Only needed for #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \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. Only used if \p md_alg is #MBEDTLS_MD_NONE. | |

* \param hash The buffer holding the message digest. | |

* \param sig The buffer holding the ciphertext. | |

* | |

* \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, | |

int (*f_rng)(void *, unsigned char *, size_t), | |

void *p_rng, | |

int mode, | |

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). | |

* | |

* The hash function for the MGF mask generating function | |

* is that specified in \p mgf1_hash_id. | |

* | |

* \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 \p hash_id in the RSA context is ignored. | |

* | |

* \param ctx The RSA public key context. | |

* \param f_rng The RNG function. Only needed for #MBEDTLS_RSA_PRIVATE. | |

* \param p_rng The RNG context. | |

* \param mode #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE. | |

* \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. Only used if \p md_alg is | |

* #MBEDTLS_MD_NONE. | |

* \param hash The buffer holding the message digest. | |

* \param mgf1_hash_id The message digest used for mask generation. | |

* \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 ciphertext. | |

* | |

* \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, | |

int (*f_rng)(void *, unsigned char *, size_t), | |

void *p_rng, | |

int mode, | |

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. | |

* \param src The source context. | |

* | |

* \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. | |

*/ | |

void mbedtls_rsa_free( mbedtls_rsa_context *ctx ); | |

/** | |

* \brief The RSA checkup routine. | |

* | |

* \return \c 0 on success. | |

* \return \c 1 on failure. | |

*/ | |

int mbedtls_rsa_self_test( int verbose ); | |

#ifdef __cplusplus | |

} | |

#endif | |

#endif /* rsa.h */ |