Start cryptobox library.

1 files changed, 119 insertions, 0 deletions

diff --git a/src/libcryptobox/cryptobox.h b/src/libcryptobox/cryptobox.h
new file mode 100644
index 000000000..af857197a
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+++ b/src/libcryptobox/cryptobox.h
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+/* Copyright (c) 2015, Vsevolod Stakhov
+ * 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 ''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 AUTHOR 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.
+ */
+#ifndef CRYPTOBOX_H_
+#define CRYPTOBOX_H_
+
+#include "config.h"
+
+#define rspamd_cryptobox_NONCEBYTES 24
+#define rspamd_cryptobox_PKBYTES 32
+#define rspamd_cryptobox_SKBYTES 32
+#define rspamd_cryptobox_MACBYTES 16
+#define rspamd_cryptobox_NMBYTES 32
+
+typedef guchar rspamd_pk_t[rspamd_cryptobox_PKBYTES];
+typedef guchar rspamd_sk_t[rspamd_cryptobox_SKBYTES];
+typedef guchar rspamd_sig_t[rspamd_cryptobox_MACBYTES];
+typedef guchar rspamd_nm_t[rspamd_cryptobox_NMBYTES];
+
+struct rspamd_encrypt_segment {
+	guchar *buf;
+	gsize len;
+};
+
+/**
+ * Init cryptobox library
+ */
+void rspamd_cryptobox_init (void);
+
+/**
+ * Generate new keypair
+ * @param pk public key buffer
+ * @param sk secret key buffer
+ */
+void rspamd_cryptobox_keypair (rspamd_pk_t pk, rspamd_sk_t sk);
+
+/**
+ * Encrypt segments of data inplace adding signature to sig afterwards
+ * @param segments segments of data
+ * @param cnt count of segments
+ * @param pk remote pubkey
+ * @param sk local secret key
+ * @param sig output signature
+ */
+void rspamd_cryptobox_encrypt_inplace (struct rspamd_encrypt_segment *segments,
+		gsize cnt, const rspamd_pk_t pk, const rspamd_sk_t sk, rspamd_sig_t sig);
+
+
+/**
+ * Decrypt and verify data chunk inplace
+ * @param data data to decrypt
+ * @param len lenght of data
+ * @param pk remote pubkey
+ * @param sk local privkey
+ * @param sig signature input
+ * @return TRUE if input has been verified successfully
+ */
+gboolean rspamd_cryptobox_decrypt_inplace (guchar *data, gsize len,
+		 const rspamd_pk_t pk, const rspamd_sk_t sk, const rspamd_sig_t sig);
+
+/**
+ * Encrypt segments of data inplace adding signature to sig afterwards
+ * @param segments segments of data
+ * @param cnt count of segments
+ * @param pk remote pubkey
+ * @param sk local secret key
+ * @param sig output signature
+ */
+void rspamd_cryptobox_encrypt_nm_inplace (struct rspamd_encrypt_segment *segments,
+		gsize cnt, const rspamd_nm_t nm, rspamd_sig_t sig);
+
+
+/**
+ * Decrypt and verify data chunk inplace
+ * @param data data to decrypt
+ * @param len lenght of data
+ * @param pk remote pubkey
+ * @param sk local privkey
+ * @param sig signature input
+ * @return TRUE if input has been verified successfully
+ */
+gboolean rspamd_cryptobox_decrypt_nm_inplace (guchar *data, gsize len,
+		 const rspamd_nm_t nm, const rspamd_sig_t sig);
+
+/**
+ * Generate shared secret from local sk and remote pk
+ * @param nm shared secret
+ * @param pk remote pubkey
+ * @param sk local privkey
+ */
+void rspamd_cryptobox_nm (rspamd_nm_t nm, rspamd_pk_t pk, rspamd_sk_t sk);
+
+/**
+ * Securely clear the buffer specified
+ * @param buf buffer to zero
+ * @param buflen length of buffer
+ */
+void rspamd_explicit_memzero (void * const buf, gsize buflen);
+
+#endif /* CRYPTOBOX_H_ */