| /** |
| * \file pk.h |
| * |
| * \brief Public Key abstraction layer |
| * |
| * Copyright (C) 2006-2013, ARM Limited, All Rights Reserved |
| * |
| * This file is part of mbed TLS (https://polarssl.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_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 ); |
| |
| /** Check public-private key pair */ |
| int (*check_pair_func)( const void *pub, const void *prv ); |
| |
| /** 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 Check if a public-private pair of keys matches. |
| * |
| * \param pub Context holding a public key. |
| * \param prv Context holding a private (and public) key. |
| * |
| * \return 0 on success or POLARSSL_ERR_PK_BAD_INPUT_DATA |
| */ |
| int pk_check_pair( const pk_context *pub, const pk_context *prv ); |
| |
| /** |
| * \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 */ |
| |
| /* |
| * Internal module functions. You probably do not want to use these unless you |
| * know you do. |
| */ |
| #if defined(POLARSSL_FS_IO) |
| int pk_load_file( const char *path, unsigned char **buf, size_t *n ); |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* POLARSSL_PK_H */ |