src/common/crypto.h

   1 /* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
   2 /* See LICENSE for licensing information */
   3 /* $Id$ */
   4
   5 #ifndef __CRYPTO_H
   6 #define __CRYPTO_H
   7
   8 #include <stdio.h>
   9 #include <openssl/rsa.h>
  10 #include <openssl/dh.h>
  11
  12 /* available encryption primitives */
  13 #define CRYPTO_CIPHER_IDENTITY 0
  14 #define CRYPTO_CIPHER_DES 1
  15 #define CRYPTO_CIPHER_RC4 2
  16 #define CRYPTO_CIPHER_3DES 3
  17 #define CRYPTO_CIPHER_AES_CTR 4
  18
  19 #define CRYPTO_PK_RSA 0
  20
  21 typedef struct crypto_pk_env_t crypto_pk_env_t;
  22 typedef struct crypto_cipher_env_t crypto_cipher_env_t;
  23
  24 /* global state */
  25 int crypto_global_init();
  26 int crypto_global_cleanup();
  27
  28 /* environment setup */
  29 crypto_pk_env_t *crypto_new_pk_env(int type);
  30 void crypto_free_pk_env(crypto_pk_env_t *env);
  31
  32 crypto_cipher_env_t *crypto_new_cipher_env(int type);
  33 void crypto_free_cipher_env(crypto_cipher_env_t *env);
  34
  35 /* public key crypto */
  36 int crypto_pk_generate_key(crypto_pk_env_t *env);
  37
  38 int crypto_pk_read_private_key_from_file(crypto_pk_env_t *env, FILE *src);
  39 int crypto_pk_read_public_key_from_file(crypto_pk_env_t *env, FILE *src);
  40 int crypto_pk_write_public_key_to_string(crypto_pk_env_t *env, char **dest, int *len);
  41 int crypto_pk_read_public_key_from_string(crypto_pk_env_t *env, const char *src, int len);
  42 int crypto_pk_write_private_key_to_file(crypto_pk_env_t *env, FILE *dest);
  43 int crypto_pk_write_private_key_to_filename(crypto_pk_env_t *env, const char *fname);
  44 int crypto_pk_write_public_key_to_file(crypto_pk_env_t *env, FILE *dest);
  45 int crypto_pk_check_key(crypto_pk_env_t *env);
  46 int crypto_pk_read_private_key_from_filename(crypto_pk_env_t *env, const char *keyfile);
  47
  48 int crypto_pk_set_key(crypto_pk_env_t *env, unsigned char *key);
  49 int crypto_pk_cmp_keys(crypto_pk_env_t *a, crypto_pk_env_t *b);
  50 crypto_pk_env_t *crypto_pk_dup_key(crypto_pk_env_t *orig);
  51 int crypto_pk_keysize(crypto_pk_env_t *env);
  52
  53 int crypto_pk_public_encrypt(crypto_pk_env_t *env, unsigned char *from, int fromlen, unsigned char *to, int padding);
  54 int crypto_pk_private_decrypt(crypto_pk_env_t *env, unsigned char *from, int fromlen, unsigned char *to, int padding);
  55 int crypto_pk_private_sign(crypto_pk_env_t *env, unsigned char *from, int fromlen, unsigned char *to);
  56 int crypto_pk_public_checksig(crypto_pk_env_t *env, unsigned char *from, int fromlen, unsigned char *to);
  57 #define FINGERPRINT_LEN 49
  58 int crypto_pk_get_fingerprint(crypto_pk_env_t *pk, char *fp_out);
  59 int crypto_pk_check_fingerprint_syntax(const char *s);
  60
  61 int base64_encode(char *dest, int destlen, const char *src, int srclen);
  62 int base64_decode(char *dest, int destlen, const char *src, int srclen);
  63
  64 /* Key negotiation */
  65 typedef struct crypto_dh_env_st {
  66   DH *dh;
  67 } crypto_dh_env_t;
  68
  69 /* #define CRYPTO_DH_SIZE (1536 / 8) */
  70 #define CRYPTO_DH_SIZE (1024 / 8)
  71 crypto_dh_env_t *crypto_dh_new();
  72 int crypto_dh_get_bytes(crypto_dh_env_t *dh);
  73 int crypto_dh_get_public(crypto_dh_env_t *dh, char *pubkey_out,
  74                          int pubkey_out_len);
  75 int crypto_dh_compute_secret(crypto_dh_env_t *dh,
  76                              char *pubkey, int pubkey_len,
  77                              char *secret_out, int secret_out_len);
  78 void crypto_dh_free(crypto_dh_env_t *dh);
  79
  80 /* symmetric crypto */
  81 int crypto_cipher_generate_key(crypto_cipher_env_t *env);
  82 int crypto_cipher_set_iv(crypto_cipher_env_t *env, unsigned char *iv);
  83 int crypto_cipher_set_key(crypto_cipher_env_t *env, unsigned char *key);
  84 int crypto_cipher_encrypt_init_cipher(crypto_cipher_env_t *env);
  85 int crypto_cipher_decrypt_init_cipher(crypto_cipher_env_t *env);
  86 unsigned char *crypto_cipher_get_key(crypto_cipher_env_t *env);
  87
  88 int crypto_cipher_encrypt(crypto_cipher_env_t *env, unsigned char *from, unsigned int fromlen, unsigned char *to);
  89 int crypto_cipher_decrypt(crypto_cipher_env_t *env, unsigned char *from, unsigned int fromlen, unsigned char *to);
  90
  91 /* only implemented for CRYPTO_CIPHER_AES_CTR */
  92 int crypto_cipher_advance(crypto_cipher_env_t *env, long delta);
  93
  94 /* convenience function: wraps crypto_create_crypto_env, set_key, set_iv, and init. */
  95 crypto_cipher_env_t *crypto_create_init_cipher(int cipher_type, char *key, char *iv, int encrypt_mode);
  96
  97 /* SHA-1 */
  98 int crypto_SHA_digest(const unsigned char *m, int len, unsigned char *digest);
  99
 100 /* random numbers */
 101 int crypto_seed_rng();
 102 int crypto_rand(unsigned int n, unsigned char *to);
 103 void crypto_pseudo_rand(unsigned int n, unsigned char *to);
 104 int crypto_pseudo_rand_int(unsigned int max);
 105
 106 /* errors */
 107 char *crypto_perror();
 108 #endif