[PATCH 08/20] libgcrypt: make it compatible with chacha20

[Alberto Aguirre <albaguirre@xxxxxxxxx>]

From: Aris Adamantiadis <aris@xxxxxxxxxxxx>

---
 include/libssh/libgcrypt.h |  1 +
 src/dh.c                   |  1 +
 src/libgcrypt.c            | 15 +++++++++++++++
 3 files changed, 17 insertions(+)

diff --git a/include/libssh/libgcrypt.h b/include/libssh/libgcrypt.h
index ec353910..307920d3 100644
--- a/include/libssh/libgcrypt.h
+++ b/include/libssh/libgcrypt.h
@@ -88,6 +88,7 @@ ssh_string ssh_sexp_extract_mpi(const gcry_sexp_t sexp,
 
 #endif /* HAVE_LIBGCRYPT */
 
+void libgcrypt_init(void);
 struct ssh_cipher_struct *ssh_get_ciphertab(void);
 
 #endif /* LIBGCRYPT_H_ */
diff --git a/src/dh.c b/src/dh.c
index f29627c5..1b5b9a47 100644
--- a/src/dh.c
+++ b/src/dh.c
@@ -190,6 +190,7 @@ int ssh_crypto_init(void) {
       p_group1 = NULL;
       return -1;
     }
+    libgcrypt_init();
 
 #elif defined HAVE_LIBCRYPTO
     p_group1 = bignum_new();
diff --git a/src/libgcrypt.c b/src/libgcrypt.c
index d9dd5be6..7f836aa1 100644
--- a/src/libgcrypt.c
+++ b/src/libgcrypt.c
@@ -35,6 +35,8 @@
 #ifdef HAVE_LIBGCRYPT
 #include <gcrypt.h>
 
+extern const struct ssh_cipher_struct chacha20poly1305_cipher;
+
 struct ssh_mac_ctx_struct {
   enum ssh_mac_e mac_type;
   gcry_md_hd_t ctx;
@@ -637,6 +639,9 @@ static struct ssh_cipher_struct ssh_ciphertab[] = {
     .encrypt     = des1_1_encrypt,
     .decrypt     = des1_1_decrypt
   },
+  {
+    .name = "chacha20-poly1305@xxxxxxxxxxx"
+  },
   {
     .name            = NULL,
     .blocksize       = 0,
@@ -650,6 +655,16 @@ static struct ssh_cipher_struct ssh_ciphertab[] = {
   }
 };
 
+void libgcrypt_init(void){
+    int i;
+    for (i=0; ssh_ciphertab[i].name != NULL; ++i){
+        if(strcmp(ssh_ciphertab[i].name, "chacha20-poly1305@xxxxxxxxxxx") == 0){
+            memcpy(&ssh_ciphertab[i], &chacha20poly1305_cipher, sizeof(struct ssh_cipher_struct));
+            break;
+        }
+    }
+}
+
 struct ssh_cipher_struct *ssh_get_ciphertab(void)
 {
   return ssh_ciphertab;
-- 
2.14.1