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-rw-r--r--src/crypto/cipher/salsa20/nacl/salsa20_nacl.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/src/crypto/cipher/salsa20/nacl/salsa20_nacl.c b/src/crypto/cipher/salsa20/nacl/salsa20_nacl.c
index 03ab1d9..6179bc2 100644
--- a/src/crypto/cipher/salsa20/nacl/salsa20_nacl.c
+++ b/src/crypto/cipher/salsa20/nacl/salsa20_nacl.c
@@ -23,17 +23,25 @@
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
+/**
+ \file
+
+ The Salsa20 implementation from NaCl
+*/
+
#include "../../../../crypto.h"
#include <crypto_stream_salsa20.h>
+/** The cipher state */
struct fastd_cipher_state {
- uint8_t key[crypto_stream_salsa20_KEYBYTES];
+ uint8_t key[crypto_stream_salsa20_KEYBYTES]; /**< The encryption key */
};
+/** Initializes the cipher state */
static fastd_cipher_state_t* salsa20_init(const uint8_t *key) {
fastd_cipher_state_t *state = malloc(sizeof(fastd_cipher_state_t));
memcpy(state->key, key, crypto_stream_salsa20_KEYBYTES);
@@ -41,11 +49,13 @@ static fastd_cipher_state_t* salsa20_init(const uint8_t *key) {
return state;
}
+/** XORs data with the Salsa20 cipher stream */
static bool salsa20_crypt(const fastd_cipher_state_t *state, fastd_block128_t *out, const fastd_block128_t *in, size_t len, const uint8_t *iv) {
crypto_stream_salsa20_xor(out->b, in->b, len, iv, state->key);
return true;
}
+/** Frees the cipher state */
static void salsa20_free(fastd_cipher_state_t *state) {
if (state) {
secure_memzero(state, sizeof(*state));
@@ -53,6 +63,8 @@ static void salsa20_free(fastd_cipher_state_t *state) {
}
}
+
+/** The nacl salsa20 implementation */
const fastd_cipher_t fastd_cipher_salsa20_nacl = {
.init = salsa20_init,
.crypt = salsa20_crypt,