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mbedtls/include/polarssl/rsa.h
Manuel Pégourié-Gonnard 5574546524 Document thread-safety of the RSA functions
2015-07-03 17:51:10 +02:00

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/**
* \file rsa.h
*
* \brief The RSA public-key cryptosystem
*
* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://tls.mbed.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_RSA_H
#define POLARSSL_RSA_H
#if !defined(POLARSSL_CONFIG_FILE)
#include "config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#include "bignum.h"
#include "md.h"
#if defined(POLARSSL_THREADING_C)
#include "threading.h"
#endif
/*
* RSA Error codes
*/
#define POLARSSL_ERR_RSA_BAD_INPUT_DATA -0x4080 /**< Bad input parameters to function. */
#define POLARSSL_ERR_RSA_INVALID_PADDING -0x4100 /**< Input data contains invalid padding and is rejected. */
#define POLARSSL_ERR_RSA_KEY_GEN_FAILED -0x4180 /**< Something failed during generation of a key. */
#define POLARSSL_ERR_RSA_KEY_CHECK_FAILED -0x4200 /**< Key failed to pass the library's validity check. */
#define POLARSSL_ERR_RSA_PUBLIC_FAILED -0x4280 /**< The public key operation failed. */
#define POLARSSL_ERR_RSA_PRIVATE_FAILED -0x4300 /**< The private key operation failed. */
#define POLARSSL_ERR_RSA_VERIFY_FAILED -0x4380 /**< The PKCS#1 verification failed. */
#define POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE -0x4400 /**< The output buffer for decryption is not large enough. */
#define POLARSSL_ERR_RSA_RNG_FAILED -0x4480 /**< The random generator failed to generate non-zeros. */
/*
* RSA constants
*/
#define RSA_PUBLIC 0
#define RSA_PRIVATE 1
#define RSA_PKCS_V15 0
#define RSA_PKCS_V21 1
#define RSA_SIGN 1
#define RSA_CRYPT 2
#define 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.
*/
#if defined(POLARSSL_RSA_C)
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief RSA context structure
*/
typedef struct
{
int ver; /*!< always 0 */
size_t len; /*!< size(N) in chars */
mpi N; /*!< public modulus */
mpi E; /*!< public exponent */
mpi D; /*!< private exponent */
mpi P; /*!< 1st prime factor */
mpi Q; /*!< 2nd prime factor */
mpi DP; /*!< D % (P - 1) */
mpi DQ; /*!< D % (Q - 1) */
mpi QP; /*!< 1 / (Q % P) */
mpi RN; /*!< cached R^2 mod N */
mpi RP; /*!< cached R^2 mod P */
mpi RQ; /*!< cached R^2 mod Q */
mpi Vi; /*!< cached blinding value */
mpi Vf; /*!< cached un-blinding value */
int padding; /*!< RSA_PKCS_V15 for 1.5 padding and
RSA_PKCS_v21 for OAEP/PSS */
int hash_id; /*!< Hash identifier of md_type_t as
specified in the md.h header file
for the EME-OAEP and EMSA-PSS
encoding */
#if defined(POLARSSL_THREADING_C)
threading_mutex_t mutex; /*!< Thread-safety mutex */
#endif
}
rsa_context;
/**
* \brief Initialize an RSA context
*
* Note: Set padding to RSA_PKCS_V21 for the RSAES-OAEP
* encryption scheme and the RSASSA-PSS signature scheme.
*
* \param ctx RSA context to be initialized
* \param padding RSA_PKCS_V15 or RSA_PKCS_V21
* \param hash_id RSA_PKCS_V21 hash identifier
*
* \note The hash_id parameter is actually ignored
* when using RSA_PKCS_V15 padding.
*
* \note 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's merely
* a default value, which can be overriden by calling specific
* rsa_rsaes_xxx or rsa_rsassa_xxx functions.
*
* \note The chosen hash is always used for OEAP encryption.
* For PSS signatures, it's always used for making signatures,
* but can be overriden (and always is, if set to
* POLARSSL_MD_NONE) for verifying them.
*/
void rsa_init( rsa_context *ctx,
int padding,
int hash_id);
/**
* \brief Set padding for an already initialized RSA context
* See \c rsa_init() for details.
*
* \param ctx RSA context to be set
* \param padding RSA_PKCS_V15 or RSA_PKCS_V21
* \param hash_id RSA_PKCS_V21 hash identifier
*/
void rsa_set_padding( rsa_context *ctx, int padding, int hash_id);
/**
* \brief Generate an RSA keypair
*
* \param ctx RSA context that will hold the key
* \param f_rng RNG function
* \param p_rng RNG parameter
* \param nbits size of the public key in bits
* \param exponent public exponent (e.g., 65537)
*
* \note rsa_init() must be called beforehand to setup
* the RSA context.
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*/
int rsa_gen_key( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
unsigned int nbits, int exponent );
/**
* \brief Check a public RSA key
*
* \param ctx RSA context to be checked
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*/
int rsa_check_pubkey( const rsa_context *ctx );
/**
* \brief Check a private RSA key
*
* \param ctx RSA context to be checked
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*/
int rsa_check_privkey( const rsa_context *ctx );
/**
* \brief Check a public-private RSA key pair.
* Check each of the contexts, and make sure they match.
*
* \param pub RSA context holding the public key
* \param prv RSA context holding the private key
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*/
int rsa_check_pub_priv( const rsa_context *pub, const rsa_context *prv );
/**
* \brief Do an RSA public key operation
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param input input buffer
* \param output output buffer
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*
* \note This function does NOT take care of message
* padding. Also, be sure to set input[0] = 0 or assure that
* input is smaller than N.
*
* \note The input and output buffers must be large
* enough (eg. 128 bytes if RSA-1024 is used).
*/
int rsa_public( rsa_context *ctx,
const unsigned char *input,
unsigned char *output );
/**
* \brief Do an RSA private key operation
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param f_rng RNG function (Needed for blinding)
* \param p_rng RNG parameter
* \param input input buffer
* \param output output buffer
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*
* \note The input and output buffers must be large
* enough (eg. 128 bytes if RSA-1024 is used).
*/
int rsa_private( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
const unsigned char *input,
unsigned char *output );
/**
* \brief Generic wrapper to perform a PKCS#1 encryption using the
* mode from the context. Add the message padding, then do an
* RSA operation.
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param f_rng RNG function (Needed for padding and PKCS#1 v2.1 encoding
* and RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param ilen contains the plaintext length
* \param input buffer holding the data to be encrypted
* \param output buffer that will hold the ciphertext
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*
* \note The output buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*/
int rsa_pkcs1_encrypt( 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 Perform a PKCS#1 v1.5 encryption (RSAES-PKCS1-v1_5-ENCRYPT)
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param f_rng RNG function (Needed for padding and RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param ilen contains the plaintext length
* \param input buffer holding the data to be encrypted
* \param output buffer that will hold the ciphertext
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*
* \note The output buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*/
int rsa_rsaes_pkcs1_v15_encrypt( 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 Perform a PKCS#1 v2.1 OAEP encryption (RSAES-OAEP-ENCRYPT)
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param f_rng RNG function (Needed for padding and PKCS#1 v2.1 encoding
* and RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param label buffer holding the custom label to use
* \param label_len contains the label length
* \param ilen contains the plaintext length
* \param input buffer holding the data to be encrypted
* \param output buffer that will hold the ciphertext
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*
* \note The output buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*/
int rsa_rsaes_oaep_encrypt( 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 Generic wrapper to perform a PKCS#1 decryption using the
* mode from the context. Do an RSA operation, then remove
* the message padding
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param f_rng RNG function (Only needed for RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param olen will contain the plaintext length
* \param input buffer holding the encrypted data
* \param output buffer that will hold the plaintext
* \param output_max_len maximum length of the output buffer
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*
* \note The output buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used) otherwise
* an error is thrown.
*/
int rsa_pkcs1_decrypt( 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 Perform a PKCS#1 v1.5 decryption (RSAES-PKCS1-v1_5-DECRYPT)
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param f_rng RNG function (Only needed for RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param olen will contain the plaintext length
* \param input buffer holding the encrypted data
* \param output buffer that will hold the plaintext
* \param output_max_len maximum length of the output buffer
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*
* \note The output buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used) otherwise
* an error is thrown.
*/
int rsa_rsaes_pkcs1_v15_decrypt( 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 Perform a PKCS#1 v2.1 OAEP decryption (RSAES-OAEP-DECRYPT)
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param f_rng RNG function (Only needed for RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param label buffer holding the custom label to use
* \param label_len contains the label length
* \param olen will contain the plaintext length
* \param input buffer holding the encrypted data
* \param output buffer that will hold the plaintext
* \param output_max_len maximum length of the output buffer
*
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
*
* \note The output buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used) otherwise
* an error is thrown.
*/
int rsa_rsaes_oaep_decrypt( 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 Generic wrapper to perform a PKCS#1 signature using the
* mode from the context. Do a private RSA operation to sign
* a message digest
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param f_rng RNG function (Needed for PKCS#1 v2.1 encoding and for
* RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data)
* \param hashlen message digest length (for POLARSSL_MD_NONE only)
* \param hash buffer holding the message digest
* \param sig buffer that will hold the ciphertext
*
* \return 0 if the signing operation was successful,
* or an POLARSSL_ERR_RSA_XXX error code
*
* \note The "sig" buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*
* \note In case of PKCS#1 v2.1 encoding, see comments on
* \note \c rsa_rsassa_pss_sign() for details on md_alg and hash_id.
*/
int rsa_pkcs1_sign( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig );
/**
* \brief Perform a PKCS#1 v1.5 signature (RSASSA-PKCS1-v1_5-SIGN)
*
* \param ctx RSA context
* \param f_rng RNG function (Only needed for RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data)
* \param hashlen message digest length (for POLARSSL_MD_NONE only)
* \param hash buffer holding the message digest
* \param sig buffer that will hold the ciphertext
*
* \return 0 if the signing operation was successful,
* or an POLARSSL_ERR_RSA_XXX error code
*
* \note The "sig" buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*/
int rsa_rsassa_pkcs1_v15_sign( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig );
/**
* \brief Perform a PKCS#1 v2.1 PSS signature (RSASSA-PSS-SIGN)
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx RSA context
* \param f_rng RNG function (Needed for PKCS#1 v2.1 encoding and for
* RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data)
* \param hashlen message digest length (for POLARSSL_MD_NONE only)
* \param hash buffer holding the message digest
* \param sig buffer that will hold the ciphertext
*
* \return 0 if the signing operation was successful,
* or an POLARSSL_ERR_RSA_XXX error code
*
* \note The "sig" buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*
* \note The hash_id in the RSA context is the one used for the
* encoding. md_alg in the function call is the type of hash
* that is encoded. According to RFC 3447 it is advised to
* keep both hashes the same.
*/
int rsa_rsassa_pss_sign( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig );
/**
* \brief Generic wrapper to perform a PKCS#1 verification using the
* mode from the context. Do a public RSA operation and check
* the message digest
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx points to an RSA public key
* \param f_rng RNG function (Only needed for RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data)
* \param hashlen message digest length (for POLARSSL_MD_NONE only)
* \param hash buffer holding the message digest
* \param sig buffer holding the ciphertext
*
* \return 0 if the verify operation was successful,
* or an POLARSSL_ERR_RSA_XXX error code
*
* \note The "sig" buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*
* \note In case of PKCS#1 v2.1 encoding, see comments on
* \c rsa_rsassa_pss_verify() about md_alg and hash_id.
*/
int rsa_pkcs1_verify( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
const unsigned char *sig );
/**
* \brief Perform a PKCS#1 v1.5 verification (RSASSA-PKCS1-v1_5-VERIFY)
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx points to an RSA public key
* \param f_rng RNG function (Only needed for RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data)
* \param hashlen message digest length (for POLARSSL_MD_NONE only)
* \param hash buffer holding the message digest
* \param sig buffer holding the ciphertext
*
* \return 0 if the verify operation was successful,
* or an POLARSSL_ERR_RSA_XXX error code
*
* \note The "sig" buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*/
int rsa_rsassa_pkcs1_v15_verify( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
const unsigned char *sig );
/**
* \brief Perform a PKCS#1 v2.1 PSS verification (RSASSA-PSS-VERIFY)
* (This is the "simple" version.)
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx points to an RSA public key
* \param f_rng RNG function (Only needed for RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data)
* \param hashlen message digest length (for POLARSSL_MD_NONE only)
* \param hash buffer holding the message digest
* \param sig buffer holding the ciphertext
*
* \return 0 if the verify operation was successful,
* or an POLARSSL_ERR_RSA_XXX error code
*
* \note The "sig" buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*
* \note The hash_id in the RSA context is the one used for the
* verification. md_alg in the function call is the type of
* hash that is verified. According to RFC 3447 it is advised to
* keep both hashes the same. If hash_id in the RSA context is
* unset, the md_alg from the function call is used.
*/
int rsa_rsassa_pss_verify( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
const unsigned char *sig );
/**
* \brief Perform a PKCS#1 v2.1 PSS verification (RSASSA-PSS-VERIFY)
* (This is the version with "full" options.)
* (Thread-safe if POLARSSL_THREADING_C is enabled)
*
* \param ctx points to an RSA public key
* \param f_rng RNG function (Only needed for RSA_PRIVATE)
* \param p_rng RNG parameter
* \param mode RSA_PUBLIC or RSA_PRIVATE
* \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data)
* \param hashlen message digest length (for POLARSSL_MD_NONE only)
* \param hash buffer holding the message digest
* \param mgf1_hash_id message digest used for mask generation
* \param expected_salt_len Length of the salt used in padding, use
* RSA_SALT_LEN_ANY to accept any salt length
* \param sig buffer holding the ciphertext
*
* \return 0 if the verify operation was successful,
* or an POLARSSL_ERR_RSA_XXX error code
*
* \note The "sig" buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*
* \note The hash_id in the RSA context is ignored.
*/
int rsa_rsassa_pss_verify_ext( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
md_type_t mgf1_hash_id,
int expected_salt_len,
const unsigned char *sig );
/**
* \brief Copy the components of an RSA context
*
* \param dst Destination context
* \param src Source context
*
* \return O on success,
* POLARSSL_ERR_MPI_MALLOC_FAILED on memory allocation failure
*/
int rsa_copy( rsa_context *dst, const rsa_context *src );
/**
* \brief Free the components of an RSA key
*
* \param ctx RSA Context to free
*/
void rsa_free( rsa_context *ctx );
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int rsa_self_test( int verbose );
#ifdef __cplusplus
}
#endif
#endif /* POLARSSL_RSA_C */
#endif /* rsa.h */
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