From: Florian Zeitz <florob@babelmonkeys.de>
Date: Fri, 16 Sep 2011 00:22:49 +0000 (+0200)
Subject: lib: Add hmac-sha1 adapted from hmac-md5
X-Git-Tag: 2.1.rc1~19
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a3350c34a257a28417c7df10b3fde97af70e4f1f;p=thirdparty%2Fdovecot%2Fcore.git

lib: Add hmac-sha1 adapted from hmac-md5
---

diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index a69ffaec6b..2f06e9357c 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -43,6 +43,7 @@ liblib_la_SOURCES = \
 	hex-binary.c \
 	hex-dec.c \
 	hmac-md5.c \
+	hmac-sha1.c \
 	home-expand.c \
 	hostpid.c \
 	imem.c \
diff --git a/src/lib/hmac-sha1.c b/src/lib/hmac-sha1.c
new file mode 100644
index 0000000000..fdaa53fc15
--- /dev/null
+++ b/src/lib/hmac-sha1.c
@@ -0,0 +1,52 @@
+/*
+ * HMAC-SHA1 (RFC-2104) implementation.
+ *
+ * Copyright (c) 2004 Andrey Panin <pazke@donpac.ru>
+ * Copyright (c) 2011 Florian Zeitz <florob@babelmonkeys.de>
+ *
+ * This software is released under the MIT license.
+ */
+
+#include "lib.h"
+#include "hmac-sha1.h"
+#include "safe-memset.h"
+
+void hmac_sha1_init(struct hmac_sha1_context *ctx,
+		   const unsigned char *key, size_t key_len)
+{
+	int i;
+	unsigned char sha1key[20];
+	unsigned char k_ipad[64];
+	unsigned char k_opad[64];
+
+	if (key_len > 64) {
+		sha1_get_digest(key, key_len, sha1key);
+		key = sha1key;
+		key_len = 20;
+	}
+
+	memcpy(k_ipad, key, key_len);
+	memset(k_ipad + key_len, 0, 64 - key_len);
+	memcpy(k_opad, k_ipad, 64);
+
+	for (i = 0; i < 64; i++) {
+		k_ipad[i] ^= 0x36;
+		k_opad[i] ^= 0x5c;
+	}
+
+	sha1_init(&ctx->ctx);
+	sha1_loop(&ctx->ctx, k_ipad, 64);
+	sha1_init(&ctx->ctxo);
+	sha1_loop(&ctx->ctxo, k_opad, 64);
+
+	safe_memset(k_ipad, 0, 64);
+	safe_memset(k_opad, 0, 64);
+}
+
+void hmac_sha1_final(struct hmac_sha1_context *ctx, unsigned char *digest)
+{
+	sha1_result(&ctx->ctx, digest);
+
+	sha1_loop(&ctx->ctxo, digest, 20);
+	sha1_result(&ctx->ctxo, digest);
+}
diff --git a/src/lib/hmac-sha1.h b/src/lib/hmac-sha1.h
new file mode 100644
index 0000000000..bac429fa00
--- /dev/null
+++ b/src/lib/hmac-sha1.h
@@ -0,0 +1,22 @@
+#ifndef HMAC_SHA1_H
+#define HMAC_SHA1_H
+
+#include "sha1.h"
+
+struct hmac_sha1_context {
+	struct sha1_ctxt ctx, ctxo;
+};
+
+void hmac_sha1_init(struct hmac_sha1_context *ctx,
+		   const unsigned char *key, size_t key_len);
+void hmac_sha1_final(struct hmac_sha1_context *ctx,
+		    unsigned char digest[SHA1_RESULTLEN]);
+
+
+static inline void
+hmac_sha1_update(struct hmac_sha1_context *ctx, const void *data, size_t size)
+{
+	sha1_loop(&ctx->ctx, data, size);
+}
+
+#endif