1 files changed, 100 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/krb5/sp800-108-kdf.c b/third_party/heimdal/lib/krb5/sp800-108-kdf.c
new file mode 100755
index 0000000..4a12067
--- /dev/null
+++ b/third_party/heimdal/lib/krb5/sp800-108-kdf.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2015, Secure Endpoints Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in
+ *   the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "krb5_locl.h"
+
+/*
+ * SP800-108 KDF
+ */
+
+/**
+ * As described in SP800-108 5.1 (for HMAC)
+ *
+ * @param context	Kerberos 5 context
+ * @param kdf_K1	Base key material.
+ * @param kdf_label	A string that identifies the purpose for the derived key.
+ * @param kdf_context   A binary string containing parties, nonce, etc.
+ * @param md		Message digest function to use for PRF.
+ * @param kdf_K0	Derived key data.
+ *
+ * @return Return an error code for an failure or 0 on success.
+ * @ingroup krb5_crypto
+ */
+krb5_error_code
+_krb5_SP800_108_HMAC_KDF(krb5_context context,
+			 const krb5_data *kdf_K1,
+			 const krb5_data *kdf_label,
+			 const krb5_data *kdf_context,
+			 const EVP_MD *md,
+			 krb5_data *kdf_K0)
+{
+    HMAC_CTX c;
+    unsigned char *p = kdf_K0->data;
+    size_t i, n, left = kdf_K0->length;
+    unsigned char hmac[EVP_MAX_MD_SIZE];
+    unsigned int h = EVP_MD_size(md);
+    const size_t L = kdf_K0->length;
+
+    heim_assert(md != NULL, "SP800-108 KDF internal error");
+
+    HMAC_CTX_init(&c);
+
+    n = L / h;
+
+    for (i = 0; i <= n; i++) {
+	unsigned char tmp[4];
+	size_t len;
+
+        if (HMAC_Init_ex(&c, kdf_K1->data, kdf_K1->length, md, NULL) == 0) {
+            HMAC_CTX_cleanup(&c);
+            return krb5_enomem(context);
+        }
+
+	_krb5_put_int(tmp, i + 1, 4);
+	HMAC_Update(&c, tmp, 4);
+	HMAC_Update(&c, kdf_label->data, kdf_label->length);
+	HMAC_Update(&c, (unsigned char *)"", 1);
+	if (kdf_context)
+	    HMAC_Update(&c, kdf_context->data, kdf_context->length);
+	_krb5_put_int(tmp, L * 8, 4);
+	HMAC_Update(&c, tmp, 4);
+
+	HMAC_Final(&c, hmac, &h);
+	len = h > left ? left : h;
+	memcpy(p, hmac, len);
+	p += len;
+	left -= len;
+    }
+
+    HMAC_CTX_cleanup(&c);
+
+    return 0;
+}