diff options
Diffstat (limited to 'src/common/crypto.c')
| -rw-r--r-- | src/common/crypto.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/common/crypto.c b/src/common/crypto.c index bbf3657d0..fec0a78a6 100644 --- a/src/common/crypto.c +++ b/src/common/crypto.c @@ -98,6 +98,49 @@ void crypto_free_pk_env(crypto_pk_env_t *env) return; } + +/* Create a new crypto_cipher_env_t for a given onion cipher type, key, + * iv, and encryption flag (1=encrypt, 0=decrypt). Return the crypto object + * on success; NULL on failure. + */ +crypto_cipher_env_t * +crypto_create_init_cipher(int cipher_type, char *key, char *iv, int encrypt_mode) +{ + int r; + crypto_cipher_env_t *crypto = NULL; + + if (! (crypto = crypto_new_cipher_env(cipher_type))) { + log(LOG_ERR, "Unable to allocate crypto object"); + return NULL; + } + + if (crypto_cipher_set_key(crypto, key)) { + log(LOG_ERR, "Unable to set key: %s", crypto_perror()); + goto error; + } + + if (crypto_cipher_set_iv(crypto, iv)) { + log(LOG_ERR, "Unable to set iv: %s", crypto_perror()); + goto error; + } + + if (encrypt_mode) + r = crypto_cipher_encrypt_init_cipher(crypto); + else + r = crypto_cipher_decrypt_init_cipher(crypto); + + if (r) { + log(LOG_ERR, "Unabble to initialize cipher: %s", crypto_perror()); + goto error; + } + return crypto; + + error: + if (crypto) + crypto_free_cipher_env(crypto); + return NULL; +} + crypto_cipher_env_t *crypto_new_cipher_env(int type) { crypto_cipher_env_t *env; @@ -650,3 +693,4 @@ char *crypto_perror() { return (char *)ERR_reason_error_string(ERR_get_error()); } + |