sys/crypto/chacha20/chacha-sw.c

   1 /* This file is in the public domain. */
   2
   3 #include <sys/cdefs.h>
   4 __FBSDID("$FreeBSD$");
   5
   6 #include <crypto/chacha20/chacha.h>
   7 #include <opencrypto/xform_enc.h>
   8
   9 static int
  10 chacha20_xform_setkey(void *ctx, const uint8_t *key, int len)
  11 {
  12
  13         if (len != CHACHA_MINKEYLEN && len != 32)
  14                 return (EINVAL);
  15
  16         chacha_keysetup(ctx, key, len * 8);
  17         return (0);
  18 }
  19
  20 static void
  21 chacha20_xform_reinit(void *ctx, const u_int8_t *iv)
  22 {
  23
  24         chacha_ivsetup(ctx, iv + 8, iv);
  25 }
  26
  27 static void
  28 chacha20_xform_crypt(void *ctx, const uint8_t *in, uint8_t *out)
  29 {
  30
  31         chacha_encrypt_bytes(ctx, in, out, CHACHA_BLOCKLEN);
  32 }
  33
  34 static void
  35 chacha20_xform_crypt_last(void *ctx, const uint8_t *in, uint8_t *out,
  36     size_t len)
  37 {
  38
  39         chacha_encrypt_bytes(ctx, in, out, len);
  40 }
  41
  42 struct enc_xform enc_xform_chacha20 = {
  43         .type = CRYPTO_CHACHA20,
  44         .name = "chacha20",
  45         .ctxsize = sizeof(struct chacha_ctx),
  46         .blocksize = 1,
  47         .native_blocksize = CHACHA_BLOCKLEN,
  48         .ivsize = CHACHA_NONCELEN + CHACHA_CTRLEN,
  49         .minkey = CHACHA_MINKEYLEN,
  50         .maxkey = 32,
  51         .encrypt = chacha20_xform_crypt,
  52         .decrypt = chacha20_xform_crypt,
  53         .setkey = chacha20_xform_setkey,
  54         .reinit = chacha20_xform_reinit,
  55         .encrypt_last = chacha20_xform_crypt_last,
  56         .decrypt_last = chacha20_xform_crypt_last,
  57 };