src/crypto/axtls_aes.c

   1 #include "crypto/axtls/crypto.h"
   2 #include <string.h>
   3 #include <errno.h>
   4 #include <gpxe/crypto.h>
   5 #include <gpxe/aes.h>
   6
   7 static int aes_setkey ( void *ctx, const void *key, size_t keylen ) {
   8         AES_CTX *aesctx = ctx;
   9         AES_MODE mode;
  10
  11         switch ( keylen ) {
  12         case ( 128 / 8 ):
  13                 mode = AES_MODE_128;
  14                 break;
  15         case ( 256 / 8 ):
  16                 mode = AES_MODE_256;
  17                 break;
  18         default:
  19                 return -EINVAL;
  20         }
  21
  22         AES_set_key ( aesctx, key, aesctx->iv, mode );
  23         return 0;
  24 }
  25
  26 static void aes_setiv ( void *ctx, const void *iv ) {
  27         AES_CTX *aesctx = ctx;
  28
  29         memcpy ( aesctx->iv, iv, sizeof ( aesctx->iv ) );
  30 }
  31
  32 static void aes_encrypt ( void *ctx, const void *data, void *dst,
  33                           size_t len ) {
  34         AES_CTX *aesctx = ctx;
  35
  36         AES_cbc_encrypt ( aesctx, data, dst, len );
  37 }
  38
  39 static void aes_decrypt ( void *ctx, const void *data, void *dst,
  40                           size_t len ) {
  41         AES_CTX *aesctx = ctx;
  42
  43         AES_cbc_decrypt ( aesctx, data, dst, len );
  44 }
  45
  46 struct crypto_algorithm aes_algorithm = {
  47         .name           = "aes",
  48         .ctxsize        = sizeof ( AES_CTX ),
  49         .blocksize      = 16,
  50         .setkey         = aes_setkey,
  51         .setiv          = aes_setiv,
  52         .encode         = aes_encrypt,
  53         .decode         = aes_decrypt,
  54 };