1 files changed, 0 insertions, 53 deletions
diff --git a/libs/libaxolotl/src/curve25519/ed25519/additions/sign_modified.c b/libs/libaxolotl/src/curve25519/ed25519/additions/sign_modified.c
deleted file mode 100644
index b2fb8c20d3..0000000000
--- a/libs/libaxolotl/src/curve25519/ed25519/additions/sign_modified.c
+++ /dev/null
@@ -1,53 +0,0 @@
-#include <string.h>
-#include "crypto_sign.h"
-#include "crypto_hash_sha512.h"
-#include "ge.h"
-#include "sc.h"
-#include "zeroize.h"
-#include "crypto_additions.h"
-
-/* NEW: Compare to pristine crypto_sign() 
-   Uses explicit private key for nonce derivation and as scalar,
-   instead of deriving both from a master key.
-*/
-int crypto_sign_modified(
-  unsigned char *sm,
-  const unsigned char *m,unsigned long long mlen,
-  const unsigned char *sk, const unsigned char* pk,
-  const unsigned char* random
-)
-{
-  unsigned char nonce[64];
-  unsigned char hram[64];
-  ge_p3 R;
-  int count=0;
-
-  memmove(sm + 64,m,mlen);
-  memmove(sm + 32,sk,32); /* NEW: Use privkey directly for nonce derivation */
-
-  /* NEW : add prefix to separate hash uses - see .h */
-  sm[0] = 0xFE;
-  for (count = 1; count < 32; count++)
-    sm[count] = 0xFF;
-
-  /* NEW: add suffix of random data */
-  memmove(sm + mlen + 64, random, 64);
-
-  crypto_hash_sha512(nonce,sm,mlen + 128);
-  memmove(sm + 32,pk,32);
-
-  sc_reduce(nonce);
-  
-  ge_scalarmult_base(&R,nonce);
-  ge_p3_tobytes(sm,&R);
-
-  crypto_hash_sha512(hram,sm,mlen + 64);
-  sc_reduce(hram);
-  sc_muladd(sm + 32,hram,sk,nonce); /* NEW: Use privkey directly */
-
-  /* Erase any traces of private scalar or
-     nonce left in the stack from sc_muladd */
-  zeroize_stack();
-  zeroize(nonce, 64);
-  return 0;
-}