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
  10 /* Length of the output of our message digest. */
  11 #define DIGEST_LEN 20
  12 /* Length of our symmetric cipher's keys. */
  13 #define CIPHER_KEY_LEN 16
  14 /* Length of our public keys. */
  15 #define PK_BYTES (1024/8)
  16 /* Length of our DH keys. */
  17 #define DH_BYTES (1024/8)
  18
  19 /* Constants used to indicate desired public-key padding functions. */
  20 #define PK_NO_PADDING         60000
  21 #define PK_PKCS1_PADDING      60001
  22 #define PK_PKCS1_OAEP_PADDING 60002
  23
  24 /* Bytes added for PKCS1 padding. */
  25 #define PKCS1_PADDING_OVERHEAD 11
  26 /* Bytes added for PKCS1-OAEP padding. */
  27 #define PKCS1_OAEP_PADDING_OVERHEAD 42
  28
  29 /* Length of encoded public key fingerprints, including space; but not
  30  * including terminating NUL. */
  31 #define FINGERPRINT_LEN 49
  32
  33
  34 typedef struct crypto_pk_env_t crypto_pk_env_t;
  35 typedef struct crypto_cipher_env_t crypto_cipher_env_t;
  36 typedef struct crypto_digest_env_t crypto_digest_env_t;
  37 typedef struct crypto_dh_env_t crypto_dh_env_t;
  38
  39 /* global state */
  40 int crypto_global_init();
  41 int crypto_global_cleanup();
  42
  43 /* environment setup */
  44 crypto_pk_env_t *crypto_new_pk_env(void);
  45 void crypto_free_pk_env(crypto_pk_env_t *env);
  46
  47 crypto_cipher_env_t *crypto_new_cipher_env(void);
  48 void crypto_free_cipher_env(crypto_cipher_env_t *env);
  49
  50 /* public key crypto */
  51 int crypto_pk_generate_key(crypto_pk_env_t *env);
  52
  53 int crypto_pk_write_public_key_to_string(crypto_pk_env_t *env, char **dest, int *len);
  54 int crypto_pk_read_public_key_from_string(crypto_pk_env_t *env, const char *src, int len);
  55 int crypto_pk_write_private_key_to_filename(crypto_pk_env_t *env, const char *fname);
  56 int crypto_pk_check_key(crypto_pk_env_t *env);
  57 int crypto_pk_read_private_key_from_filename(crypto_pk_env_t *env, const char *keyfile);
  58
  59 int crypto_pk_cmp_keys(crypto_pk_env_t *a, crypto_pk_env_t *b);
  60 crypto_pk_env_t *crypto_pk_dup_key(crypto_pk_env_t *orig);
  61 int crypto_pk_keysize(crypto_pk_env_t *env);
  62
  63 int crypto_pk_public_encrypt(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to, int padding);
  64 int crypto_pk_private_decrypt(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to, int padding);
  65 int crypto_pk_private_sign(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to);
  66 int crypto_pk_private_sign_digest(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to);
  67 int crypto_pk_public_checksig(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to);
  68 int crypto_pk_public_checksig_digest(crypto_pk_env_t *env, const unsigned char *data, int datalen, const unsigned char *sig, int siglen);
  69 int crypto_pk_public_hybrid_encrypt(crypto_pk_env_t *env,
  70                                     const unsigned char *from, int fromlen,
  71                                     unsigned char *to, int padding, int force);
  72 int crypto_pk_private_hybrid_decrypt(crypto_pk_env_t *env,
  73                                      const unsigned char *from, int fromlen,
  74                                      unsigned char *to,int padding);
  75
  76 int crypto_pk_asn1_encode(crypto_pk_env_t *pk, char *dest, int dest_len);
  77 crypto_pk_env_t *crypto_pk_asn1_decode(const char *str, int len);
  78 int crypto_pk_get_digest(crypto_pk_env_t *pk, char *digest_out);
  79 int crypto_pk_get_fingerprint(crypto_pk_env_t *pk, char *fp_out);
  80 int crypto_pk_check_fingerprint_syntax(const char *s);
  81
  82 int base64_encode(char *dest, int destlen, const char *src, int srclen);
  83 int base64_decode(char *dest, int destlen, const char *src, int srclen);
  84 #define BASE32_CHARS "abcdefghijklmnopqrstuvwxyz234567"
  85 int base32_encode(char *dest, int destlen, const char *src, int srclen);
  86
  87 /* Key negotiation */
  88 crypto_dh_env_t *crypto_dh_new();
  89 int crypto_dh_get_bytes(crypto_dh_env_t *dh);
  90 int crypto_dh_generate_public(crypto_dh_env_t *dh);
  91 int crypto_dh_get_public(crypto_dh_env_t *dh, char *pubkey_out,
  92                          int pubkey_out_len);
  93 int crypto_dh_compute_secret(crypto_dh_env_t *dh,
  94                              const char *pubkey, int pubkey_len,
  95                              char *secret_out, int secret_out_len);
  96 void crypto_dh_free(crypto_dh_env_t *dh);
  97
  98 /* symmetric crypto */
  99 int crypto_cipher_generate_key(crypto_cipher_env_t *env);
 100 int crypto_cipher_set_key(crypto_cipher_env_t *env, const unsigned char *key);
 101 int crypto_cipher_encrypt_init_cipher(crypto_cipher_env_t *env);
 102 int crypto_cipher_decrypt_init_cipher(crypto_cipher_env_t *env);
 103 const unsigned char *crypto_cipher_get_key(crypto_cipher_env_t *env);
 104
 105 int crypto_cipher_encrypt(crypto_cipher_env_t *env, const unsigned char *from, unsigned int fromlen, unsigned char *to);
 106 int crypto_cipher_decrypt(crypto_cipher_env_t *env, const unsigned char *from, unsigned int fromlen, unsigned char *to);
 107
 108 /* only implemented for CRYPTO_CIPHER_AES_CTR */
 109 int crypto_cipher_rewind(crypto_cipher_env_t *env, long delta);
 110 int crypto_cipher_advance(crypto_cipher_env_t *env, long delta);
 111
 112 /* convenience function: wraps crypto_create_crypto_env, set_key, and init. */
 113 crypto_cipher_env_t *crypto_create_init_cipher(const char *key, int encrypt_mode);
 114
 115 /* SHA-1 */
 116 int crypto_digest(const unsigned char *m, int len, unsigned char *digest);
 117 crypto_digest_env_t *crypto_new_digest_env();
 118 void crypto_free_digest_env(crypto_digest_env_t *digest);
 119 void crypto_digest_add_bytes(crypto_digest_env_t *digest, const char *data,
 120                              size_t len);
 121 void crypto_digest_get_digest(crypto_digest_env_t *digest,
 122                               char *out, size_t out_len);
 123 crypto_digest_env_t *crypto_digest_dup(const crypto_digest_env_t *digest);
 124 void crypto_digest_assign(crypto_digest_env_t *into,
 125                           const crypto_digest_env_t *from);
 126
 127 /* random numbers */
 128 int crypto_seed_rng();
 129 int crypto_rand(unsigned int n, unsigned char *to);
 130 void crypto_pseudo_rand(unsigned int n, unsigned char *to);
 131 int crypto_pseudo_rand_int(unsigned int max);
 132
 133 #endif
 134
 135 /*
 136   Local Variables:
 137   mode:c
 138   indent-tabs-mode:nil
 139   c-basic-offset:2
 140   End:
 141 */