1 files changed, 74 insertions, 0 deletions
diff --git a/wsutil/wsgcrypt.h b/wsutil/wsgcrypt.h
new file mode 100644
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+++ b/wsutil/wsgcrypt.h
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+/** @file
+ *
+ * Wrapper around libgcrypt's include file gcrypt.h.
+ * For libgcrypt 1.5.0, including gcrypt.h directly brings up lots of
+ * compiler warnings about deprecated definitions.
+ * Try to work around these warnings to ensure a clean build with -Werror.
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 2007 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef __WSGCRYPT_H__
+#define __WSGCRYPT_H__
+
+#include <wireshark.h>
+#include <gcrypt.h>
+
+#define HASH_MD5_LENGTH      16
+#define HASH_SHA1_LENGTH     20
+#define HASH_SHA2_224_LENGTH 28
+#define HASH_SHA2_256_LENGTH 32
+#define HASH_SHA2_384_LENGTH 48
+#define HASH_SHA2_512_LENGTH 64
+
+/* Convenience function to calculate the HMAC from the data in BUFFER
+   of size LENGTH with key KEY of size KEYLEN using the algorithm ALGO avoiding the creating of a
+   hash object. The hash is returned in the caller provided buffer
+   DIGEST which must be large enough to hold the digest of the given
+   algorithm. */
+WS_DLL_PUBLIC gcry_error_t ws_hmac_buffer(int algo, void *digest, const void *buffer, size_t length, const void *key, size_t keylen);
+
+WS_DLL_PUBLIC gcry_error_t ws_cmac_buffer(int algo, void *digest, const void *buffer, size_t length, const void *key, size_t keylen);
+
+/* Convenience function to encrypt 8 bytes in BUFFER with DES using the 56 bits KEY expanded to
+   64 bits as key, encrypted data is returned in OUTPUT which must be at least 8 bytes large */
+WS_DLL_PUBLIC void crypt_des_ecb(uint8_t *output, const uint8_t *buffer, const uint8_t *key56);
+
+/* Convenience function for RSA decryption. Returns decrypted length on success, 0 on failure */
+WS_DLL_PUBLIC size_t rsa_decrypt_inplace(const unsigned len, unsigned char* data, gcry_sexp_t pk, bool pkcs1_padding, char **err);
+
+/**
+ * RFC 5869 HMAC-based Extract-and-Expand Key Derivation Function (HKDF):
+ * HKDF-Expand(PRK, info, L) -> OKM
+ *
+ * @param hashalgo  [in] Libgcrypt hash algorithm identifier.
+ * @param prk       [in] Pseudo-random key.
+ * @param prk_len   [in] Length of prk.
+ * @param info      [in] Optional context (can be NULL if info_len is zero).
+ * @param info_len  [in] Length of info.
+ * @param out       [out] Output keying material.
+ * @param out_len   [in] Size of output keying material.
+ * @return 0 on success and an error code otherwise.
+ */
+WS_DLL_PUBLIC gcry_error_t
+hkdf_expand(int hashalgo, const uint8_t *prk, unsigned prk_len, const uint8_t *info, unsigned info_len,
+            uint8_t *out, unsigned out_len);
+
+/*
+ * Calculate HKDF-Extract(salt, IKM) -> PRK according to RFC 5869.
+ * Caller MUST ensure that 'prk' is large enough to store the digest from hash
+ * algorithm 'hashalgo' (e.g. 32 bytes for SHA-256).
+ */
+static inline gcry_error_t
+hkdf_extract(int hashalgo, const uint8_t *salt, size_t salt_len, const uint8_t *ikm, size_t ikm_len, uint8_t *prk)
+{
+    /* PRK = HMAC-Hash(salt, IKM) where salt is key, and IKM is input. */
+    return ws_hmac_buffer(hashalgo, prk, ikm, ikm_len, salt, salt_len);
+}
+
+
+#endif /* __WSGCRYPT_H__ */