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-/**
- * \file rsa.h
- *
- * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
- *
- * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * * Neither the names of PolarSSL or XySSL nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef POLARSSL_RSA_H
-#define POLARSSL_RSA_H
-
-#include "polarssl/bignum.h"
-
-#define POLARSSL_ERR_RSA_BAD_INPUT_DATA -0x0400
-#define POLARSSL_ERR_RSA_INVALID_PADDING -0x0410
-#define POLARSSL_ERR_RSA_KEY_GEN_FAILED -0x0420
-#define POLARSSL_ERR_RSA_KEY_CHECK_FAILED -0x0430
-#define POLARSSL_ERR_RSA_PUBLIC_FAILED -0x0440
-#define POLARSSL_ERR_RSA_PRIVATE_FAILED -0x0450
-#define POLARSSL_ERR_RSA_VERIFY_FAILED -0x0460
-#define POLARSSL_ERR_RSA_OUTPUT_TO_LARGE -0x0470
-
-/*
- * PKCS#1 constants
- */
-#define RSA_RAW 0
-#define RSA_MD2 2
-#define RSA_MD4 3
-#define RSA_MD5 4
-#define RSA_SHA1 5
-#define RSA_SHA256 6
-
-#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
-
-/*
- * DigestInfo ::= SEQUENCE {
- * digestAlgorithm DigestAlgorithmIdentifier,
- * digest Digest }
- *
- * DigestAlgorithmIdentifier ::= AlgorithmIdentifier
- *
- * Digest ::= OCTET STRING
- */
-#define ASN1_HASH_MDX \
- "\x30\x20\x30\x0C\x06\x08\x2A\x86\x48" \
- "\x86\xF7\x0D\x02\x00\x05\x00\x04\x10"
-
-#define ASN1_HASH_SHA1 \
- "\x30\x21\x30\x09\x06\x05\x2B\x0E\x03" \
- "\x02\x1A\x05\x00\x04\x14"
-
-/**
- * \brief RSA context structure
- */
-typedef struct
-{
- int ver; /*!< always 0 */
- int 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 */
-
- int padding; /*!< 1.5 or OAEP/PSS */
- int hash_id; /*!< hash identifier */
- int (*f_rng)(void *); /*!< RNG function */
- void *p_rng; /*!< RNG parameter */
-}
-rsa_context;
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * \brief Initialize an RSA context
- *
- * \param ctx RSA context to be initialized
- * \param padding RSA_PKCS_V15 or RSA_PKCS_V21
- * \param hash_id RSA_PKCS_V21 hash identifier
- * \param f_rng RNG function
- * \param p_rng RNG parameter
- *
- * \note The hash_id parameter is actually ignored
- * when using RSA_PKCS_V15 padding.
- *
- * \note Currently (xyssl-0.8), RSA_PKCS_V21 padding
- * is not supported.
- */
-void rsa_init( rsa_context *ctx,
- int padding,
- int hash_id,
- int (*f_rng)(void *),
- void *p_rng );
-
-/**
- * \brief Generate an RSA keypair
- *
- * \param ctx RSA context that will hold the key
- * \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 (especially f_rng and p_rng).
- *
- * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
- */
-int rsa_gen_key( rsa_context *ctx, 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( 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( rsa_context *ctx );
-
-/**
- * \brief Do an RSA public key operation
- *
- * \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.
- *
- * \note The input and output buffers must be large
- * enough (eg. 128 bytes if RSA-1024 is used).
- */
-int rsa_public( rsa_context *ctx,
- unsigned char *input,
- unsigned char *output );
-
-/**
- * \brief Do an RSA private key operation
- *
- * \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 The input and output buffers must be large
- * enough (eg. 128 bytes if RSA-1024 is used).
- */
-int rsa_private( rsa_context *ctx,
- unsigned char *input,
- unsigned char *output );
-
-/**
- * \brief Add the message padding, then do an RSA operation
- *
- * \param ctx RSA context
- * \param mode RSA_PUBLIC or RSA_PRIVATE
- * \param ilen contains the 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 mode, int ilen,
- unsigned char *input,
- unsigned char *output );
-
-/**
- * \brief Do an RSA operation, then remove the message padding
- *
- * \param ctx RSA context
- * \param mode RSA_PUBLIC or RSA_PRIVATE
- * \param input buffer holding the encrypted data
- * \param output buffer that will hold the plaintext
- * \param olen will contain the plaintext length
- * \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 mode, int *olen,
- unsigned char *input,
- unsigned char *output,
- int output_max_len);
-
-/**
- * \brief Do a private RSA to sign a message digest
- *
- * \param ctx RSA context
- * \param mode RSA_PUBLIC or RSA_PRIVATE
- * \param hash_id RSA_RAW, RSA_MD{2,4,5} or RSA_SHA{1,256}
- * \param hashlen message digest length (for RSA_RAW 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_pkcs1_sign( rsa_context *ctx,
- int mode,
- int hash_id,
- int hashlen,
- unsigned char *hash,
- unsigned char *sig );
-
-/**
- * \brief Do a public RSA and check the message digest
- *
- * \param ctx points to an RSA public key
- * \param mode RSA_PUBLIC or RSA_PRIVATE
- * \param hash_id RSA_RAW, RSA_MD{2,4,5} or RSA_SHA{1,256}
- * \param hashlen message digest length (for RSA_RAW 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_pkcs1_verify( rsa_context *ctx,
- int mode,
- int hash_id,
- int hashlen,
- unsigned char *hash,
- unsigned char *sig );
-
-/**
- * \brief Free the components of an RSA key
- */
-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 /* rsa.h */