gost_crypt: Fix Magma CBC in-place decryption

Simplest fix not concerned with performance, still should not impact it
too much.

diff --git a/gost_crypt.c b/gost_crypt.c
index ffb577db84dbae00eee4d700dc1b11c336faf8ed..33dc668cba088cbf88fa1053d432bf835f7390a5 100644 (file)
--- a/gost_crypt.c
+++ b/gost_crypt.c
@@ -774,10 +774,11 @@ int magma_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
                 d[7 - i] = in_ptr[i];
             }
             gostdecrypt(&(c->cctx), d, b);
+            memcpy(d, in_ptr, 8);
             for (i = 0; i < 8; i++) {
                 out_ptr[i] = iv[i] ^ b[7 - i];
             }
-            memcpy(iv, in_ptr, 8);
+            memcpy(iv, d, 8);
             out_ptr += 8;
             in_ptr += 8;
             inl -= 8;