src/common/crypto.h

   1 /* Copyright (c) 2001, Matej Pfajfar.
   2  * Copyright (c) 2001-2004, Roger Dingledine.
   3  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
   4  * Copyright (c) 2007-2011, The Tor Project, Inc. */
   5 /* See LICENSE for licensing information */
   6
   7 /**
   8  * \file crypto.h
   9  *
  10  * \brief Headers for crypto.c
  11  **/
  12
  13 #ifndef _TOR_CRYPTO_H
  14 #define _TOR_CRYPTO_H
  15
  16 #include <stdio.h>
  17 #include "torint.h"
  18
  19 /** Length of the output of our message digest. */
  20 #define DIGEST_LEN 20
  21 /** Length of our symmetric cipher's keys. */
  22 #define CIPHER_KEY_LEN 16
  23 /** Length of our symmetric cipher's IV. */
  24 #define CIPHER_IV_LEN 16
  25 /** Length of our public keys. */
  26 #define PK_BYTES (1024/8)
  27 /** Length of our DH keys. */
  28 #define DH_BYTES (1024/8)
  29
  30 /** Length of a message digest when encoded in base64 with trailing = signs
  31  * removed. */
  32 #define BASE64_DIGEST_LEN 27
  33
  34 /** Constants used to indicate no padding for public-key encryption */
  35 #define PK_NO_PADDING         60000
  36 /** Constants used to indicate PKCS1 padding for public-key encryption */
  37 #define PK_PKCS1_PADDING      60001
  38 /** Constants used to indicate OAEP padding for public-key encryption */
  39 #define PK_PKCS1_OAEP_PADDING 60002
  40
  41 /** Number of bytes added for PKCS1 padding. */
  42 #define PKCS1_PADDING_OVERHEAD 11
  43 /** Number of bytes added for PKCS1-OAEP padding. */
  44 #define PKCS1_OAEP_PADDING_OVERHEAD 42
  45
  46 /** Length of encoded public key fingerprints, including space; but not
  47  * including terminating NUL. */
  48 #define FINGERPRINT_LEN 49
  49 /** Length of hex encoding of SHA1 digest, not including final NUL. */
  50 #define HEX_DIGEST_LEN 40
  51
  52 typedef struct crypto_pk_env_t crypto_pk_env_t;
  53 typedef struct crypto_cipher_env_t crypto_cipher_env_t;
  54 typedef struct crypto_digest_env_t crypto_digest_env_t;
  55 typedef struct crypto_dh_env_t crypto_dh_env_t;
  56
  57 /* global state */
  58 int crypto_global_init(int hardwareAccel);
  59 void crypto_thread_cleanup(void);
  60 int crypto_global_cleanup(void);
  61
  62 /* environment setup */
  63 crypto_pk_env_t *crypto_new_pk_env(void);
  64 void crypto_free_pk_env(crypto_pk_env_t *env);
  65
  66 /* convenience function: wraps crypto_create_crypto_env, set_key, and init. */
  67 crypto_cipher_env_t *crypto_create_init_cipher(const char *key,
  68                                                int encrypt_mode);
  69
  70 crypto_cipher_env_t *crypto_new_cipher_env(void);
  71 void crypto_free_cipher_env(crypto_cipher_env_t *env);
  72
  73 /* public key crypto */
  74 int crypto_pk_generate_key(crypto_pk_env_t *env);
  75
  76 int crypto_pk_read_private_key_from_filename(crypto_pk_env_t *env,
  77                                              const char *keyfile);
  78 int crypto_pk_write_public_key_to_string(crypto_pk_env_t *env,
  79                                          char **dest, size_t *len);
  80 int crypto_pk_write_private_key_to_string(crypto_pk_env_t *env,
  81                                           char **dest, size_t *len);
  82 int crypto_pk_read_public_key_from_string(crypto_pk_env_t *env,
  83                                           const char *src, size_t len);
  84 int crypto_pk_read_private_key_from_string(crypto_pk_env_t *env,
  85                                            const char *s);
  86 int crypto_pk_write_private_key_to_filename(crypto_pk_env_t *env,
  87                                             const char *fname);
  88
  89 int crypto_pk_check_key(crypto_pk_env_t *env);
  90 int crypto_pk_cmp_keys(crypto_pk_env_t *a, crypto_pk_env_t *b);
  91 size_t crypto_pk_keysize(crypto_pk_env_t *env);
  92 crypto_pk_env_t *crypto_pk_dup_key(crypto_pk_env_t *orig);
  93 crypto_pk_env_t *crypto_pk_copy_full(crypto_pk_env_t *orig);
  94 int crypto_pk_key_is_private(const crypto_pk_env_t *key);
  95
  96 int crypto_pk_public_encrypt(crypto_pk_env_t *env, char *to,
  97                              const char *from, size_t fromlen, int padding);
  98 int crypto_pk_private_decrypt(crypto_pk_env_t *env, char *to,
  99                               const char *from, size_t fromlen,
 100                               int padding, int warnOnFailure);
 101 int crypto_pk_public_checksig(crypto_pk_env_t *env, char *to,
 102                               const char *from, size_t fromlen);
 103 int crypto_pk_public_checksig_digest(crypto_pk_env_t *env, const char *data,
 104                                size_t datalen, const char *sig, size_t siglen);
 105 int crypto_pk_private_sign(crypto_pk_env_t *env, char *to,
 106                            const char *from, size_t fromlen);
 107 int crypto_pk_private_sign_digest(crypto_pk_env_t *env, char *to,
 108                                   const char *from, size_t fromlen);
 109 int crypto_pk_public_hybrid_encrypt(crypto_pk_env_t *env, char *to,
 110                                     const char *from, size_t fromlen,
 111                                     int padding, int force);
 112 int crypto_pk_private_hybrid_decrypt(crypto_pk_env_t *env, char *to,
 113                                      const char *from, size_t fromlen,
 114                                      int padding, int warnOnFailure);
 115
 116 int crypto_pk_asn1_encode(crypto_pk_env_t *pk, char *dest, size_t dest_len);
 117 crypto_pk_env_t *crypto_pk_asn1_decode(const char *str, size_t len);
 118 int crypto_pk_get_digest(crypto_pk_env_t *pk, char *digest_out);
 119 int crypto_pk_get_fingerprint(crypto_pk_env_t *pk, char *fp_out,int add_space);
 120 int crypto_pk_check_fingerprint_syntax(const char *s);
 121
 122 /* symmetric crypto */
 123 int crypto_cipher_generate_key(crypto_cipher_env_t *env);
 124 int crypto_cipher_set_key(crypto_cipher_env_t *env, const char *key);
 125 void crypto_cipher_generate_iv(char *iv_out);
 126 int crypto_cipher_set_iv(crypto_cipher_env_t *env, const char *iv);
 127 const char *crypto_cipher_get_key(crypto_cipher_env_t *env);
 128 int crypto_cipher_encrypt_init_cipher(crypto_cipher_env_t *env);
 129 int crypto_cipher_decrypt_init_cipher(crypto_cipher_env_t *env);
 130
 131 int crypto_cipher_encrypt(crypto_cipher_env_t *env, char *to,
 132                           const char *from, size_t fromlen);
 133 int crypto_cipher_decrypt(crypto_cipher_env_t *env, char *to,
 134                           const char *from, size_t fromlen);
 135 int crypto_cipher_crypt_inplace(crypto_cipher_env_t *env, char *d, size_t len);
 136
 137 int crypto_cipher_encrypt_with_iv(crypto_cipher_env_t *env,
 138                                   char *to, size_t tolen,
 139                                   const char *from, size_t fromlen);
 140 int crypto_cipher_decrypt_with_iv(crypto_cipher_env_t *env,
 141                                   char *to, size_t tolen,
 142                                   const char *from, size_t fromlen);
 143
 144 /* SHA-1 */
 145 int crypto_digest(char *digest, const char *m, size_t len);
 146 crypto_digest_env_t *crypto_new_digest_env(void);
 147 void crypto_free_digest_env(crypto_digest_env_t *digest);
 148 void crypto_digest_add_bytes(crypto_digest_env_t *digest, const char *data,
 149                              size_t len);
 150 void crypto_digest_get_digest(crypto_digest_env_t *digest,
 151                               char *out, size_t out_len);
 152 crypto_digest_env_t *crypto_digest_dup(const crypto_digest_env_t *digest);
 153 void crypto_digest_assign(crypto_digest_env_t *into,
 154                           const crypto_digest_env_t *from);
 155 void crypto_hmac_sha1(char *hmac_out,
 156                       const char *key, size_t key_len,
 157                       const char *msg, size_t msg_len);
 158
 159 /* Key negotiation */
 160 crypto_dh_env_t *crypto_dh_new(void);
 161 int crypto_dh_get_bytes(crypto_dh_env_t *dh);
 162 int crypto_dh_generate_public(crypto_dh_env_t *dh);
 163 int crypto_dh_get_public(crypto_dh_env_t *dh, char *pubkey_out,
 164                          size_t pubkey_out_len);
 165 ssize_t crypto_dh_compute_secret(crypto_dh_env_t *dh,
 166                              const char *pubkey, size_t pubkey_len,
 167                              char *secret_out, size_t secret_out_len);
 168 void crypto_dh_free(crypto_dh_env_t *dh);
 169 int crypto_expand_key_material(const char *key_in, size_t in_len,
 170                                char *key_out, size_t key_out_len);
 171
 172 /* random numbers */
 173 int crypto_seed_rng(int startup);
 174 int crypto_rand(char *to, size_t n);
 175 int crypto_rand_int(unsigned int max);
 176 uint64_t crypto_rand_uint64(uint64_t max);
 177
 178 char *crypto_random_hostname(int min_rand_len, int max_rand_len,
 179                              const char *prefix, const char *suffix);
 180
 181 struct smartlist_t;
 182 void *smartlist_choose(const struct smartlist_t *sl);
 183 void smartlist_shuffle(struct smartlist_t *sl);
 184
 185 int base64_encode(char *dest, size_t destlen, const char *src, size_t srclen);
 186 int base64_decode(char *dest, size_t destlen, const char *src, size_t srclen);
 187 /** Characters that can appear (case-insensitively) in a base-32 encoding. */
 188 #define BASE32_CHARS "abcdefghijklmnopqrstuvwxyz234567"
 189 void base32_encode(char *dest, size_t destlen, const char *src, size_t srclen);
 190 int base32_decode(char *dest, size_t destlen, const char *src, size_t srclen);
 191
 192 int digest_to_base64(char *d64, const char *digest);
 193 int digest_from_base64(char *digest, const char *d64);
 194
 195 /** Length of RFC2440-style S2K specifier: the first 8 bytes are a salt, the
 196  * 9th describes how much iteration to do. */
 197 #define S2K_SPECIFIER_LEN 9
 198 void secret_to_key(char *key_out, size_t key_out_len, const char *secret,
 199                    size_t secret_len, const char *s2k_specifier);
 200
 201 #ifdef CRYPTO_PRIVATE
 202 /* Prototypes for private functions only used by tortls.c and crypto.c */
 203 struct rsa_st;
 204 struct evp_pkey_st;
 205 struct dh_st;
 206 struct rsa_st *_crypto_pk_env_get_rsa(crypto_pk_env_t *env);
 207 crypto_pk_env_t *_crypto_new_pk_env_rsa(struct rsa_st *rsa);
 208 crypto_pk_env_t *_crypto_new_pk_env_evp_pkey(struct evp_pkey_st *pkey);
 209 struct evp_pkey_st *_crypto_pk_env_get_evp_pkey(crypto_pk_env_t *env,
 210                                                 int private);
 211 struct dh_st *_crypto_dh_env_get_dh(crypto_dh_env_t *dh);
 212 /* Prototypes for private functions only used by crypto.c and test.c*/
 213 void add_spaces_to_fp(char *out, size_t outlen, const char *in);
 214 #endif
 215
 216 #endif
 217