gost_crypt.c | 6 ++++++
 gost_lcl.h   | 1 +
 2 files changed, 7 insertions(+)

diff --git a/gost_crypt.c b/gost_crypt.c
index 930d40a..6354b7d 100644
--- a/gost_crypt.c
+++ b/gost_crypt.c
@@ -1190,6 +1190,12 @@ int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
             c->dgst_size = arg;
             return 1;
         }
+    case EVP_MD_CTRL_SET_IV: {
+        struct ossl_gost_imit_ctx *gost_imit_ctx = EVP_MD_CTX_md_data(ctx);
+        OPENSSL_assert(ptr != NULL);
+        memcpy(gost_imit_ctx->buffer, ptr, arg);
+        return 1;
+    }
 
     default:
         return 0;
diff --git a/gost_lcl.h b/gost_lcl.h
index 78c6523..da5c892 100644
--- a/gost_lcl.h
+++ b/gost_lcl.h
@@ -253,6 +253,7 @@ void inc_counter(unsigned char *buffer, size_t buf_len);
 # define EVP_MD_CTRL_KEY_LEN (EVP_MD_CTRL_ALG_CTRL+3)
 # define EVP_MD_CTRL_SET_KEY (EVP_MD_CTRL_ALG_CTRL+4)
 # define EVP_MD_CTRL_MAC_LEN (EVP_MD_CTRL_ALG_CTRL+5)
+# define EVP_MD_CTRL_SET_IV  (EVP_MD_CTRL_ALG_CTRL+6)
 /* EVP_PKEY_METHOD key encryption callbacks */
 /* From gost_ec_keyx.c */
 int pkey_gost_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out,