pigweed / third_party / github / ARMmbed / mbedtls / c936bbb15a5fb5a50b6e17360fa9dd41270406f7 / . / 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 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 */ |