gui: Clear top window only once on resize.

[paraslash.git] / crypt_common.c

diff --git a/crypt_common.c b/crypt_common.c
index 05d71de4076cee75a6c285acc5bc0334dfe1db17..71aabf53f944eea64d4214fccff354787b7e6f9b 100644 (file)
--- a/crypt_common.c
+++ b/crypt_common.c
@@ -1,20 +1,20 @@
 /*
 /*

- * Copyright (C) 2005-2011 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2014 Andre Noll <maan@systemlinux.org>

  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 

-/** \file crypt_common.c Crypto functions independent of the implementation. */
+/** \file crypt_common.c Crypto functions independent of openssl/libgcrypt. */

 
 #include <regex.h>
 
 #include <regex.h>

-#include <stdbool.h>

 
 #include "para.h"
 #include "error.h"
 #include "string.h"
 
 #include "para.h"
 #include "error.h"
 #include "string.h"

-#include "crypt_backend.h"

 #include "crypt.h"
 #include "crypt.h"

+#include "crypt_backend.h"

 
 

+/** If the key begins with this text, we treat it as an ssh key. */

 #define KEY_TYPE_TXT "ssh-rsa"
 
 /**
 #define KEY_TYPE_TXT "ssh-rsa"
 
 /**


@@ -54,11 +54,19 @@ size_t is_ssh_rsa_key(char *data, size_t size)
 static const char Base64[] =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 static const char Pad64 = '=';
 static const char Base64[] =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 static const char Pad64 = '=';

-/*
+
+/**
+ * base64-decode a buffer.
+ *
+ * \param src The buffer to decode.
+ * \param target Result is stored here.
+ * \param targsize Number of bytes of \a target.
+ *

  * Skips all whitespace anywhere. Converts characters, four at a time, starting
  * at (or after) src from base - 64 numbers into three 8 bit bytes in the
  * Skips all whitespace anywhere. Converts characters, four at a time, starting
  * at (or after) src from base - 64 numbers into three 8 bit bytes in the

- * target area. it returns the number of data bytes stored at the target, or -E_BASE64
- * on error.
+ * target area.
+ *
+ * \return The number of data bytes stored at the target, -E_BASE64 on errors.

  */
 int base64_decode(char const *src, unsigned char *target, size_t targsize)
 {
  */
 int base64_decode(char const *src, unsigned char *target, size_t targsize)
 {


@@ -77,7 +85,7 @@ int base64_decode(char const *src, unsigned char *target, size_t targsize)
                        break;
 
                pos = strchr(Base64, ch);
                        break;
 
                pos = strchr(Base64, ch);

-               if (pos == 0) /* A non-base64 character. */
+               if (pos == NULL) /* A non-base64 character. */

                        return -E_BASE64;
 
                switch (state) {
                        return -E_BASE64;
 
                switch (state) {


@@ -177,6 +185,17 @@ int base64_decode(char const *src, unsigned char *target, size_t targsize)
        return tarindex;
 }
 
        return tarindex;
 }
 

+/**
+ * uudecode a buffer.
+ *
+ * \param src The buffer to decode.
+ * \param target Result buffer.
+ * \param targsize The length of \a target in bytes.
+ *
+ * This is just a simple wrapper for base64_decode() which strips whitespace.
+ *
+ * \return The return value of the underlying call to base64_decode().
+ */

 int uudecode(const char *src, unsigned char *target, size_t targsize)
 {
        int len;
 int uudecode(const char *src, unsigned char *target, size_t targsize)
 {
        int len;


@@ -196,9 +215,15 @@ int uudecode(const char *src, unsigned char *target, size_t targsize)
        return len;
 }
 
        return len;
 }
 

-/*
- * Can not use the inline functions of portable_io.h here because the byte
- * order is different.
+/**
+ * Read a 4-byte number from a buffer in big-endian format.
+ *
+ * \param vp The buffer.
+ *
+ * The byte-order of the buffer is expected to be big-endian, unlike read_u32()
+ * of portable_io.h which expects little endian.
+ *
+ * \return The 32 bit number given by \a vp.

  */
 uint32_t read_ssh_u32(const void *vp)
 {
  */
 uint32_t read_ssh_u32(const void *vp)
 {


@@ -213,6 +238,19 @@ uint32_t read_ssh_u32(const void *vp)
        return v;
 }
 
        return v;
 }
 

+/**
+ * Sanity checks for the header of an ssh key.
+ *
+ * \param blob The buffer.
+ * \param blen The number of bytes of \a blob.
+ *
+ * This performs some checks to make sure we really have an ssh key. It also
+ * computes the offset in bytes of the start of the key values (modulus,
+ * exponent..).
+ *
+ * \return The number of bytes to skip until the start of the first encoded
+ * number (usually 11).
+ */

 int check_ssh_key_header(const unsigned char *blob, int blen)
 {
        const unsigned char *p = blob, *end = blob + blen;
 int check_ssh_key_header(const unsigned char *blob, int blen)
 {
        const unsigned char *p = blob, *end = blob + blen;


@@ -234,6 +272,18 @@ int check_ssh_key_header(const unsigned char *blob, int blen)
        return 4 + rlen;
 }
 
        return 4 + rlen;
 }
 

+/**
+ * Check existence and permissions of a key file.
+ *
+ * \param file The path of the key file.
+ * \param private_key Whether this is a private key.
+ *
+ * This checks whether the file exists. If it is a private key, we additionally
+ * check that the permissions are restrictive enough. It is considered an error
+ * if we own the file and it is readable for others.
+ *
+ * \return Standard.
+ */

 int check_key_file(const char *file, bool private_key)
 {
        struct stat st;
 int check_key_file(const char *file, bool private_key)
 {
        struct stat st;


@@ -271,33 +321,3 @@ int hash_compare(unsigned char *h1, unsigned char *h2)
        }
        return 0;
 }
        }
        return 0;
 }

-
-int sc_recv_buffer(struct stream_cipher_context *scc, char *buf, size_t size)
-{
-       int n;
-
-       assert(size);
-       n = sc_recv_bin_buffer(scc, buf, size - 1);
-       if (n >= 0)
-               buf[n] = '\0';
-       else
-               *buf = '\0';
-       return n;
-}
-
-int sc_send_buffer(struct stream_cipher_context *scc, char *buf)
-{
-       return sc_send_bin_buffer(scc, buf, strlen(buf));
-}
-
-__printf_2_3 int sc_send_va_buffer(struct stream_cipher_context *scc,
-               const char *fmt, ...)
-{
-       char *msg;
-       int ret;
-
-       PARA_VSPRINTF(fmt, msg);
-       ret = sc_send_buffer(scc, msg);
-       free(msg);
-       return ret;
-}