Commit bc8c6732 authored by Roger Dingledine's avatar Roger Dingledine
Browse files

add crypto_cipher_rewind to reverse crypto_cipher_advance 


svn:r957
parent 55a94cd4

src/common/crypto.c

+8 −2
Original line number Diff line number Diff line
@@ -807,6 +807,12 @@ int crypto_cipher_decrypt(crypto_cipher_env_t *env, unsigned char *from, unsigne 
  }

}



int

crypto_cipher_rewind(crypto_cipher_env_t *env, long delta)

{

  return crypto_cipher_advance(env, -delta);

}



int

crypto_cipher_advance(crypto_cipher_env_t *env, long delta)

{
@@ -841,8 +847,8 @@ crypto_new_digest_env(int type) 


void

crypto_free_digest_env(crypto_digest_env_t *digest) {

  assert(digest);

  tor_free(digest);

  if(digest)

    free(digest);

}



void

src/common/crypto.h

+1 −0
Original line number Diff line number Diff line
@@ -92,6 +92,7 @@ int crypto_cipher_encrypt(crypto_cipher_env_t *env, unsigned char *from, unsigne 
int crypto_cipher_decrypt(crypto_cipher_env_t *env, unsigned char *from, unsigned int fromlen, unsigned char *to);



/* only implemented for CRYPTO_CIPHER_AES_CTR */

int crypto_cipher_rewind(crypto_cipher_env_t *env, long delta);

int crypto_cipher_advance(crypto_cipher_env_t *env, long delta);



/* convenience function: wraps crypto_create_crypto_env, set_key, set_iv, and init. */