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- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
- #include "datatypes.h"
- #include "null_cipher.h"
- #include "err.h"
- #include "alloc.h"
- #include "cipher_types.h"
- static srtp_err_status_t srtp_null_cipher_alloc(srtp_cipher_t **c,
- int key_len,
- int tlen)
- {
- extern const srtp_cipher_type_t srtp_null_cipher;
- debug_print(srtp_mod_cipher, "allocating cipher with key length %d",
- key_len);
-
- *c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
- if (*c == NULL) {
- return srtp_err_status_alloc_fail;
- }
-
- (*c)->algorithm = SRTP_NULL_CIPHER;
- (*c)->type = &srtp_null_cipher;
- (*c)->state = (void *)0x1;
-
- (*c)->key_len = key_len;
- return srtp_err_status_ok;
- }
- static srtp_err_status_t srtp_null_cipher_dealloc(srtp_cipher_t *c)
- {
- extern const srtp_cipher_type_t srtp_null_cipher;
-
- octet_string_set_to_zero(c, sizeof(srtp_cipher_t));
-
- srtp_crypto_free(c);
- return srtp_err_status_ok;
- }
- static srtp_err_status_t srtp_null_cipher_init(void *cv, const uint8_t *key)
- {
-
- debug_print0(srtp_mod_cipher, "initializing null cipher");
- return srtp_err_status_ok;
- }
- static srtp_err_status_t srtp_null_cipher_set_iv(void *cv,
- uint8_t *iv,
- srtp_cipher_direction_t dir)
- {
-
- return srtp_err_status_ok;
- }
- static srtp_err_status_t srtp_null_cipher_encrypt(void *cv,
- unsigned char *buf,
- unsigned int *bytes_to_encr)
- {
-
- return srtp_err_status_ok;
- }
- static const char srtp_null_cipher_description[] = "null cipher";
- static const srtp_cipher_test_case_t srtp_null_cipher_test_0 = {
- 0,
- NULL,
- 0,
- 0,
- NULL,
- 0,
- NULL,
- 0,
- NULL,
- 0,
- NULL
- };
- const srtp_cipher_type_t srtp_null_cipher = {
- srtp_null_cipher_alloc,
- srtp_null_cipher_dealloc,
- srtp_null_cipher_init,
- 0,
- srtp_null_cipher_encrypt,
- srtp_null_cipher_encrypt,
- srtp_null_cipher_set_iv,
- 0,
- srtp_null_cipher_description,
- &srtp_null_cipher_test_0,
- SRTP_NULL_CIPHER
- };
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