From c29f4739ceb69343c92c3f24d2a16b609747e5a9 Mon Sep 17 00:00:00 2001
From: jsing <jsing@openbsd.org>
Date: Sat, 17 Feb 2018 14:53:58 +0000
Subject: [PATCH] Provide HMAC_CTX_new(), HMAC_CTX_free(), HMAC_CTX_reset() and
 HMAC_CTX_get_md().

---
 lib/libcrypto/Symbols.list |  4 +++
 lib/libcrypto/hmac/hmac.c  | 56 ++++++++++++++++++++++++++++++++------
 lib/libcrypto/hmac/hmac.h  |  7 +++--
 3 files changed, 56 insertions(+), 11 deletions(-)

diff --git a/lib/libcrypto/Symbols.list b/lib/libcrypto/Symbols.list
index bee42ac1641..1da0493c73e 100644
--- a/lib/libcrypto/Symbols.list
+++ b/lib/libcrypto/Symbols.list
@@ -1604,7 +1604,11 @@ HKDF_extract
 HMAC
 HMAC_CTX_cleanup
 HMAC_CTX_copy
+HMAC_CTX_free
+HMAC_CTX_get_md
 HMAC_CTX_init
+HMAC_CTX_new
+HMAC_CTX_reset
 HMAC_CTX_set_flags
 HMAC_Final
 HMAC_Init
diff --git a/lib/libcrypto/hmac/hmac.c b/lib/libcrypto/hmac/hmac.c
index 84917662ca8..7bf17eed965 100644
--- a/lib/libcrypto/hmac/hmac.c
+++ b/lib/libcrypto/hmac/hmac.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: hmac.c,v 1.24 2017/03/03 10:39:07 inoguchi Exp $ */
+/* $OpenBSD: hmac.c,v 1.25 2018/02/17 14:53:58 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -171,6 +171,38 @@ err:
 	return 0;
 }
 
+HMAC_CTX *
+HMAC_CTX_new(void)
+{
+	HMAC_CTX *ctx;
+
+	if ((ctx = calloc(1, sizeof(*ctx))) == NULL)
+		return NULL;
+
+	HMAC_CTX_init(ctx);
+
+	return ctx;
+}
+
+void
+HMAC_CTX_free(HMAC_CTX *ctx)
+{
+	if (ctx == NULL)
+		return;
+
+	HMAC_CTX_cleanup(ctx);
+
+	free(ctx);
+}
+
+int
+HMAC_CTX_reset(HMAC_CTX *ctx)
+{
+	HMAC_CTX_cleanup(ctx);
+	HMAC_CTX_init(ctx);
+	return 1;
+}
+
 void
 HMAC_CTX_init(HMAC_CTX *ctx)
 {
@@ -206,6 +238,20 @@ HMAC_CTX_cleanup(HMAC_CTX *ctx)
 	explicit_bzero(ctx, sizeof(*ctx));
 }
 
+void
+HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
+{
+	EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
+	EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
+	EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
+}
+
+const EVP_MD *
+HMAC_CTX_get_md(const HMAC_CTX *ctx)
+{
+	return ctx->md;
+}
+
 unsigned char *
 HMAC(const EVP_MD *evp_md, const void *key, int key_len, const unsigned char *d,
     size_t n, unsigned char *md, unsigned int *md_len)
@@ -228,11 +274,3 @@ err:
 	HMAC_CTX_cleanup(&c);
 	return NULL;
 }
-
-void
-HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
-{
-	EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
-	EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
-	EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
-}
diff --git a/lib/libcrypto/hmac/hmac.h b/lib/libcrypto/hmac/hmac.h
index f3418b3cb75..e787c62ac89 100644
--- a/lib/libcrypto/hmac/hmac.h
+++ b/lib/libcrypto/hmac/hmac.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: hmac.h,v 1.12 2014/06/21 13:39:46 jsing Exp $ */
+/* $OpenBSD: hmac.h,v 1.13 2018/02/17 14:53:59 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -83,8 +83,10 @@ typedef struct hmac_ctx_st {
 
 #define HMAC_size(e)	(EVP_MD_size((e)->md))
 
-
+HMAC_CTX *HMAC_CTX_new(void);
+void HMAC_CTX_free(HMAC_CTX *ctx);
 void HMAC_CTX_init(HMAC_CTX *ctx);
+int HMAC_CTX_reset(HMAC_CTX *ctx);
 void HMAC_CTX_cleanup(HMAC_CTX *ctx);
 
 #define HMAC_cleanup(ctx) HMAC_CTX_cleanup(ctx) /* deprecated */
@@ -100,6 +102,7 @@ unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
 int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx);
 
 void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags);
+const EVP_MD *HMAC_CTX_get_md(const HMAC_CTX *ctx);
 
 #ifdef  __cplusplus
 }
-- 
2.20.1