From: Boris Pismenny <borisp@mellanox.com>
Date: Thu, 1 Jun 2017 05:54:55 +0000 (+0300)
Subject: evp/e_aes: Expose IV
X-Git-Tag: openssl-3.0.0-alpha1~2751
X-Git-Url: https://git.openssl.org/?p=openssl.git;a=commitdiff_plain;h=ecd1557fb4589103316c65b1fd1d4217a30900c0

evp/e_aes: Expose IV

This commit exposes the cipher's IV to applications.

Signed-off-by: Boris Pismenny <borisp@mellanox.com>

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Paul Yang <yang.yang@baishancloud.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5253)
---

diff --git a/crypto/evp/e_aes.c b/crypto/evp/e_aes.c
index 7b35575f0a..09f6598b6c 100644
--- a/crypto/evp/e_aes.c
+++ b/crypto/evp/e_aes.c
@@ -2866,6 +2866,14 @@ static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
         memcpy(ptr, c->buf, arg);
         return 1;
 
+    case EVP_CTRL_GET_IV:
+        if (gctx->iv_gen != 1)
+            return 0;
+        if (gctx->ivlen != arg)
+            return 0;
+        memcpy(ptr, gctx->iv, arg);
+        return 1;
+
     case EVP_CTRL_GCM_SET_IV_FIXED:
         /* Special case: -1 length restores whole IV */
         if (arg == -1) {
diff --git a/include/openssl/evp.h b/include/openssl/evp.h
index f381a5760f..636ed1b680 100644
--- a/include/openssl/evp.h
+++ b/include/openssl/evp.h
@@ -350,6 +350,8 @@ int (*EVP_CIPHER_meth_get_ctrl(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
 # define         EVP_CTRL_SET_PIPELINE_INPUT_BUFS        0x23
 /* Set the input buffer lengths to use for a pipelined operation */
 # define         EVP_CTRL_SET_PIPELINE_INPUT_LENS        0x24
+/* Get the IV used by the cipher */
+# define         EVP_CTRL_GET_IV                         0x25
 
 /* Padding modes */
 #define EVP_PADDING_PKCS7       1