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mbedtls/include/polarssl/pk.h
Manuel Pégourié-Gonnard d543a582bf Clarify padding questions in the PK documentation
2014-06-25 14:04:36 +02:00

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/**
* \file pk.h
*
* \brief Public Key abstraction layer
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* 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_PK_H
#define POLARSSL_PK_H
#if !defined(POLARSSL_CONFIG_FILE)
#include "config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#include "md.h"
#if defined(POLARSSL_RSA_C)
#include "rsa.h"
#endif
#if defined(POLARSSL_ECP_C)
#include "ecp.h"
#endif
#if defined(POLARSSL_ECDSA_C)
#include "ecdsa.h"
#endif
#define POLARSSL_ERR_PK_MALLOC_FAILED -0x2F80 /**< Memory alloation failed. */
#define POLARSSL_ERR_PK_TYPE_MISMATCH -0x2F00 /**< Type mismatch, eg attempt to encrypt with an ECDSA key */
#define POLARSSL_ERR_PK_BAD_INPUT_DATA -0x2E80 /**< Bad input parameters to function. */
#define POLARSSL_ERR_PK_FILE_IO_ERROR -0x2E00 /**< Read/write of file failed. */
#define POLARSSL_ERR_PK_KEY_INVALID_VERSION -0x2D80 /**< Unsupported key version */
#define POLARSSL_ERR_PK_KEY_INVALID_FORMAT -0x2D00 /**< Invalid key tag or value. */
#define POLARSSL_ERR_PK_UNKNOWN_PK_ALG -0x2C80 /**< Key algorithm is unsupported (only RSA and EC are supported). */
#define POLARSSL_ERR_PK_PASSWORD_REQUIRED -0x2C00 /**< Private key password can't be empty. */
#define POLARSSL_ERR_PK_PASSWORD_MISMATCH -0x2B80 /**< Given private key password does not allow for correct decryption. */
#define POLARSSL_ERR_PK_INVALID_PUBKEY -0x2B00 /**< The pubkey tag or value is invalid (only RSA and EC are supported). */
#define POLARSSL_ERR_PK_INVALID_ALG -0x2A80 /**< The algorithm tag or value is invalid. */
#define POLARSSL_ERR_PK_UNKNOWN_NAMED_CURVE -0x2A00 /**< Elliptic curve is unsupported (only NIST curves are supported). */
#define POLARSSL_ERR_PK_FEATURE_UNAVAILABLE -0x2980 /**< Unavailable feature, e.g. RSA disabled for RSA key. */
#define POLARSSL_ERR_PK_SIG_LEN_MISMATCH -0x2000 /**< The signature is valid but its length is less than expected. */
#if defined(POLARSSL_RSA_C)
/**
* Quick access to an RSA context inside a PK context.
*
* \warning You must make sure the PK context actually holds an RSA context
* before using this macro!
*/
#define pk_rsa( pk ) ( (rsa_context *) (pk).pk_ctx )
#endif /* POLARSSL_RSA_C */
#if defined(POLARSSL_ECP_C)
/**
* Quick access to an EC context inside a PK context.
*
* \warning You must make sure the PK context actually holds an EC context
* before using this macro!
*/
#define pk_ec( pk ) ( (ecp_keypair *) (pk).pk_ctx )
#endif /* POLARSSL_ECP_C */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Public key types
*/
typedef enum {
POLARSSL_PK_NONE=0,
POLARSSL_PK_RSA,
POLARSSL_PK_ECKEY,
POLARSSL_PK_ECKEY_DH,
POLARSSL_PK_ECDSA,
POLARSSL_PK_RSA_ALT,
POLARSSL_PK_RSASSA_PSS,
} pk_type_t;
/**
* \brief Options for RSASSA-PSS signature verification.
* See \c rsa_rsassa_pss_verify_ext()
*/
typedef struct
{
md_type_t mgf1_hash_id;
int expected_salt_len;
} pk_rsassa_pss_options;
/**
* \brief Types for interfacing with the debug module
*/
typedef enum
{
POLARSSL_PK_DEBUG_NONE = 0,
POLARSSL_PK_DEBUG_MPI,
POLARSSL_PK_DEBUG_ECP,
} pk_debug_type;
/**
* \brief Item to send to the debug module
*/
typedef struct
{
pk_debug_type type;
const char *name;
void *value;
} pk_debug_item;
/** Maximum number of item send for debugging, plus 1 */
#define POLARSSL_PK_DEBUG_MAX_ITEMS 3
/**
* \brief Public key information and operations
*/
typedef struct
{
/** Public key type */
pk_type_t type;
/** Type name */
const char *name;
/** Get key size in bits */
size_t (*get_size)( const void * );
/** Tell if the context implements this type (e.g. ECKEY can do ECDSA) */
int (*can_do)( pk_type_t type );
/** Verify signature */
int (*verify_func)( void *ctx, md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len );
/** Make signature */
int (*sign_func)( void *ctx, md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/** Decrypt message */
int (*decrypt_func)( void *ctx, const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/** Encrypt message */
int (*encrypt_func)( void *ctx, const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/** Allocate a new context */
void * (*ctx_alloc_func)( void );
/** Free the given context */
void (*ctx_free_func)( void *ctx );
/** Interface with the debug module */
void (*debug_func)( const void *ctx, pk_debug_item *items );
} pk_info_t;
/**
* \brief Public key container
*/
typedef struct
{
const pk_info_t * pk_info; /**< Public key informations */
void * pk_ctx; /**< Underlying public key context */
} pk_context;
/**
* \brief Types for RSA-alt abstraction
*/
typedef int (*pk_rsa_alt_decrypt_func)( void *ctx, int mode, size_t *olen,
const unsigned char *input, unsigned char *output,
size_t output_max_len );
typedef int (*pk_rsa_alt_sign_func)( void *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 );
typedef size_t (*pk_rsa_alt_key_len_func)( void *ctx );
/**
* \brief Return information associated with the given PK type
*
* \param pk_type PK type to search for.
*
* \return The PK info associated with the type or NULL if not found.
*/
const pk_info_t *pk_info_from_type( pk_type_t pk_type );
/**
* \brief Initialize a pk_context (as NONE)
*/
void pk_init( pk_context *ctx );
/**
* \brief Free a pk_context
*/
void pk_free( pk_context *ctx );
/**
* \brief Initialize a PK context with the information given
* and allocates the type-specific PK subcontext.
*
* \param ctx Context to initialize. Must be empty (type NONE).
* \param info Information to use
*
* \return 0 on success,
* POLARSSL_ERR_PK_BAD_INPUT_DATA on invalid input,
* POLARSSL_ERR_PK_MALLOC_FAILED on allocation failure.
*
* \note For contexts holding an RSA-alt key, use
* \c pk_init_ctx_rsa_alt() instead.
*/
int pk_init_ctx( pk_context *ctx, const pk_info_t *info );
/**
* \brief Initialize an RSA-alt context
*
* \param ctx Context to initialize. Must be empty (type NONE).
* \param key RSA key pointer
* \param decrypt_func Decryption function
* \param sign_func Signing function
* \param key_len_func Function returning key length in bytes
*
* \return 0 on success, or POLARSSL_ERR_PK_BAD_INPUT_DATA if the
* context wasn't already initialized as RSA_ALT.
*
* \note This function replaces \c pk_init_ctx() for RSA-alt.
*/
int pk_init_ctx_rsa_alt( pk_context *ctx, void * key,
pk_rsa_alt_decrypt_func decrypt_func,
pk_rsa_alt_sign_func sign_func,
pk_rsa_alt_key_len_func key_len_func );
/**
* \brief Get the size in bits of the underlying key
*
* \param ctx Context to use
*
* \return Key size in bits, or 0 on error
*/
size_t pk_get_size( const pk_context *ctx );
/**
* \brief Get the length in bytes of the underlying key
* \param ctx Context to use
*
* \return Key length in bytes, or 0 on error
*/
static inline size_t pk_get_len( const pk_context *ctx )
{
return( ( pk_get_size( ctx ) + 7 ) / 8 );
}
/**
* \brief Tell if a context can do the operation given by type
*
* \param ctx Context to test
* \param type Target type
*
* \return 0 if context can't do the operations,
* 1 otherwise.
*/
int pk_can_do( pk_context *ctx, pk_type_t type );
/**
* \brief Verify signature (including padding if relevant).
*
* \param ctx PK context to use
* \param md_alg Hash algorithm used (see notes)
* \param hash Hash of the message to sign
* \param hash_len Hash length or 0 (see notes)
* \param sig Signature to verify
* \param sig_len Signature length
*
* \return 0 on success (signature is valid),
* POLARSSL_ERR_PK_SIG_LEN_MISMATCH if the signature is
* valid but its actual length is less than sig_len,
* or a specific error code.
*
* \note For RSA keys, the default padding type is PKCS#1 v1.5.
* Use \c pk_verify_ext( POLARSSL_PK_RSASSA_PSS, ... )
* to verify RSASSA_PSS signatures.
*
* \note If hash_len is 0, then the length associated with md_alg
* is used instead, or an error returned if it is invalid.
*
* \note md_alg may be POLARSSL_MD_NONE, only if hash_len != 0
*/
int pk_verify( pk_context *ctx, md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len );
/**
* \brief Verify signature, with options.
* (Includes verification of the padding depending on type.)
*
* \param type Signature type (inc. possible padding type) to verify
* \param options Pointer to type-specific options, or NULL
* \param ctx PK context to use
* \param md_alg Hash algorithm used (see notes)
* \param hash Hash of the message to sign
* \param hash_len Hash length or 0 (see notes)
* \param sig Signature to verify
* \param sig_len Signature length
*
* \return 0 on success (signature is valid),
* POLARSSL_ERR_PK_TYPE_MISMATCH if the PK context can't be
* used for this type of signatures,
* POLARSSL_ERR_PK_SIG_LEN_MISMATCH if the signature is
* valid but its actual length is less than sig_len,
* or a specific error code.
*
* \note If hash_len is 0, then the length associated with md_alg
* is used instead, or an error returned if it is invalid.
*
* \note md_alg may be POLARSSL_MD_NONE, only if hash_len != 0
*
* \note If type is POLARSSL_PK_RSASSA_PSS, then options must point
* to a pk_rsassa_pss_options structure,
* otherwise it must be NULL.
*/
int pk_verify_ext( pk_type_t type, const void *options,
pk_context *ctx, md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len );
/**
* \brief Make signature, including padding if relevant.
*
* \param ctx PK context to use
* \param md_alg Hash algorithm used (see notes)
* \param hash Hash of the message to sign
* \param hash_len Hash length or 0 (see notes)
* \param sig Place to write the signature
* \param sig_len Number of bytes written
* \param f_rng RNG function
* \param p_rng RNG parameter
*
* \return 0 on success, or a specific error code.
*
* \note For RSA keys, the default padding type is PKCS#1 v1.5.
* There is no interface in the PK module to make RSASSA-PSS
* signatures yet.
*
* \note If hash_len is 0, then the length associated with md_alg
* is used instead, or an error returned if it is invalid.
*
* \note md_alg may be POLARSSL_MD_NONE, only if hash_len != 0
*/
int pk_sign( pk_context *ctx, md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
/**
* \brief Decrypt message (including padding if relevant).
*
* \param ctx PK context to use
* \param input Input to decrypt
* \param ilen Input size
* \param output Decrypted output
* \param olen Decrypted message length
* \param osize Size of the output buffer
* \param f_rng RNG function
* \param p_rng RNG parameter
*
* \note For RSA keys, the default padding type is PKCS#1 v1.5.
*
* \return 0 on success, or a specific error code.
*/
int pk_decrypt( pk_context *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
/**
* \brief Encrypt message (including padding if relevant).
*
* \param ctx PK context to use
* \param input Message to encrypt
* \param ilen Message size
* \param output Encrypted output
* \param olen Encrypted output length
* \param osize Size of the output buffer
* \param f_rng RNG function
* \param p_rng RNG parameter
*
* \note For RSA keys, the default padding type is PKCS#1 v1.5.
*
* \return 0 on success, or a specific error code.
*/
int pk_encrypt( pk_context *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
/**
* \brief Export debug information
*
* \param ctx Context to use
* \param items Place to write debug items
*
* \return 0 on success or POLARSSL_ERR_PK_BAD_INPUT_DATA
*/
int pk_debug( const pk_context *ctx, pk_debug_item *items );
/**
* \brief Access the type name
*
* \param ctx Context to use
*
* \return Type name on success, or "invalid PK"
*/
const char * pk_get_name( const pk_context *ctx );
/**
* \brief Get the key type
*
* \param ctx Context to use
*
* \return Type on success, or POLARSSL_PK_NONE
*/
pk_type_t pk_get_type( const pk_context *ctx );
#if defined(POLARSSL_PK_PARSE_C)
/** \ingroup pk_module */
/**
* \brief Parse a private key
*
* \param ctx key to be initialized
* \param key input buffer
* \param keylen size of the buffer
* \param pwd password for decryption (optional)
* \param pwdlen size of the password
*
* \note On entry, ctx must be empty, either freshly initialised
* with pk_init() or reset with pk_free(). If you need a
* specific key type, check the result with pk_can_do().
*
* \note The key is also checked for correctness.
*
* \return 0 if successful, or a specific PK or PEM error code
*/
int pk_parse_key( pk_context *ctx,
const unsigned char *key, size_t keylen,
const unsigned char *pwd, size_t pwdlen );
/** \ingroup pk_module */
/**
* \brief Parse a public key
*
* \param ctx key to be initialized
* \param key input buffer
* \param keylen size of the buffer
*
* \note On entry, ctx must be empty, either freshly initialised
* with pk_init() or reset with pk_free(). If you need a
* specific key type, check the result with pk_can_do().
*
* \note The key is also checked for correctness.
*
* \return 0 if successful, or a specific PK or PEM error code
*/
int pk_parse_public_key( pk_context *ctx,
const unsigned char *key, size_t keylen );
#if defined(POLARSSL_FS_IO)
/** \ingroup pk_module */
/**
* \brief Load and parse a private key
*
* \param ctx key to be initialized
* \param path filename to read the private key from
* \param password password to decrypt the file (can be NULL)
*
* \note On entry, ctx must be empty, either freshly initialised
* with pk_init() or reset with pk_free(). If you need a
* specific key type, check the result with pk_can_do().
*
* \note The key is also checked for correctness.
*
* \return 0 if successful, or a specific PK or PEM error code
*/
int pk_parse_keyfile( pk_context *ctx,
const char *path, const char *password );
/** \ingroup pk_module */
/**
* \brief Load and parse a public key
*
* \param ctx key to be initialized
* \param path filename to read the private key from
*
* \note On entry, ctx must be empty, either freshly initialised
* with pk_init() or reset with pk_free(). If you need a
* specific key type, check the result with pk_can_do().
*
* \note The key is also checked for correctness.
*
* \return 0 if successful, or a specific PK or PEM error code
*/
int pk_parse_public_keyfile( pk_context *ctx, const char *path );
#endif /* POLARSSL_FS_IO */
#endif /* POLARSSL_PK_PARSE_C */
#if defined(POLARSSL_PK_WRITE_C)
/**
* \brief Write a private key to a PKCS#1 or SEC1 DER structure
* Note: data is written at the end of the buffer! Use the
* return value to determine where you should start
* using the buffer
*
* \param ctx private to write away
* \param buf buffer to write to
* \param size size of the buffer
*
* \return length of data written if successful, or a specific
* error code
*/
int pk_write_key_der( pk_context *ctx, unsigned char *buf, size_t size );
/**
* \brief Write a public key to a SubjectPublicKeyInfo DER structure
* Note: data is written at the end of the buffer! Use the
* return value to determine where you should start
* using the buffer
*
* \param ctx public key to write away
* \param buf buffer to write to
* \param size size of the buffer
*
* \return length of data written if successful, or a specific
* error code
*/
int pk_write_pubkey_der( pk_context *ctx, unsigned char *buf, size_t size );
#if defined(POLARSSL_PEM_WRITE_C)
/**
* \brief Write a public key to a PEM string
*
* \param ctx public key to write away
* \param buf buffer to write to
* \param size size of the buffer
*
* \return 0 successful, or a specific error code
*/
int pk_write_pubkey_pem( pk_context *ctx, unsigned char *buf, size_t size );
/**
* \brief Write a private key to a PKCS#1 or SEC1 PEM string
*
* \param ctx private to write away
* \param buf buffer to write to
* \param size size of the buffer
*
* \return 0 successful, or a specific error code
*/
int pk_write_key_pem( pk_context *ctx, unsigned char *buf, size_t size );
#endif /* POLARSSL_PEM_WRITE_C */
#endif /* POLARSSL_PK_WRITE_C */
/*
* WARNING: Low-level functions. You probably do not want to use these unless
* you are certain you do ;)
*/
#if defined(POLARSSL_PK_PARSE_C)
/**
* \brief Parse a SubjectPublicKeyInfo DER structure
*
* \param p the position in the ASN.1 data
* \param end end of the buffer
* \param pk the key to fill
*
* \return 0 if successful, or a specific PK error code
*/
int pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
pk_context *pk );
#endif /* POLARSSL_PK_PARSE_C */
#if defined(POLARSSL_PK_WRITE_C)
/**
* \brief Write a subjectPublicKey to ASN.1 data
* Note: function works backwards in data buffer
*
* \param p reference to current position pointer
* \param start start of the buffer (for bounds-checking)
* \param key public key to write away
*
* \return the length written or a negative error code
*/
int pk_write_pubkey( unsigned char **p, unsigned char *start,
const pk_context *key );
#endif /* POLARSSL_PK_WRITE_C */
#ifdef __cplusplus
}
#endif
#endif /* POLARSSL_PK_H */
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