#include <openssl/err.h>
#include <openssl/rc4.h>
#include <openssl/pem.h>
+#include <openssl/sha.h>
#include "para.h"
#include "error.h"
}
#define RC4_ALIGN 8
+struct stream_cipher {
+ RC4_KEY key;
+};
+
+/**
+ * Allocate and initialize a stream cipher structure.
+ *
+ * \param data The key.
+ * \param len The size of the key.
+ *
+ * \return A new stream cipher structure.
+ */
+struct stream_cipher *sc_new(const unsigned char *data, int len)
+{
+ struct stream_cipher *sc = para_malloc(sizeof(*sc));
+ RC4_set_key(&sc->key, len, data);
+ return sc;
+}
+
+/**
+ * Deallocate a stream cipher structure.
+ *
+ * \param sc A stream cipher previously obtained by sc_new().
+ */
+void sc_free(struct stream_cipher *sc)
+{
+ free(sc);
+}
/**
* Encrypt and send a buffer.
*
- * \param rc4c The rc4 crypt context.
+ * \param scc The context.
* \param buf The buffer to send.
* \param len The size of \a buf in bytes.
*
*
* \sa \ref write_all(), RC4(3).
*/
-int rc4_send_bin_buffer(struct rc4_context *rc4c, const char *buf, size_t len)
+int sc_send_bin_buffer(struct stream_cipher_context *scc, const char *buf,
+ size_t len)
{
int ret;
unsigned char *tmp;
assert(len);
tmp = para_malloc(l2);
- RC4(&rc4c->send_key, l1, (const unsigned char *)buf, tmp);
+ RC4(&scc->send->key, l1, (const unsigned char *)buf, tmp);
if (len > l1) {
memcpy(remainder, buf + l1, len - l1);
- RC4(&rc4c->send_key, len - l1, remainder, tmp + l1);
+ RC4(&scc->send->key, len - l1, remainder, tmp + l1);
}
- ret = write_all(rc4c->fd, (char *)tmp, &len);
+ ret = write_all(scc->fd, (char *)tmp, &len);
free(tmp);
return ret;
}
/**
* Encrypt and send a \p NULL-terminated buffer.
*
- * \param rc4c The rc4 crypt context.
+ * \param scc The context.
* \param buf The buffer to send.
*
- * \return The return value of the underyling call to rc4_send_bin_buffer().
+ * \return The return value of the underyling call to sc_send_bin_buffer().
*/
-int rc4_send_buffer(struct rc4_context *rc4c, const char *buf)
+int sc_send_buffer(struct stream_cipher_context *scc, const char *buf)
{
- return rc4_send_bin_buffer(rc4c, buf, strlen(buf));
+ return sc_send_bin_buffer(scc, buf, strlen(buf));
}
/**
* Format, encrypt and send a buffer.
*
- * \param rc4c The rc4 crypt context.
+ * \param scc The context.
* \param fmt A format string.
*
- * \return The return value of the underyling call to rc4_send_buffer().
+ * \return The return value of the underyling call to sc_send_buffer().
*/
-__printf_2_3 int rc4_send_va_buffer(struct rc4_context *rc4c, const char *fmt, ...)
+__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 = rc4_send_buffer(rc4c, msg);
+ ret = sc_send_buffer(scc, msg);
free(msg);
return ret;
}
/**
* Receive a buffer and decrypt it.
*
- * \param rc4c The rc4 crypt context.
+ * \param scc The context.
* \param buf The buffer to write the decrypted data to.
* \param size The size of \a buf.
*
*
* \sa recv(2), RC4(3).
*/
-int rc4_recv_bin_buffer(struct rc4_context *rc4c, char *buf, size_t size)
+int sc_recv_bin_buffer(struct stream_cipher_context *scc, char *buf,
+ size_t size)
{
unsigned char *tmp = para_malloc(size);
- ssize_t ret = recv(rc4c->fd, tmp, size, 0);
+ ssize_t ret = recv(scc->fd, tmp, size, 0);
if (ret > 0)
- RC4(&rc4c->recv_key, ret, tmp, (unsigned char *)buf);
+ RC4(&scc->recv->key, ret, tmp, (unsigned char *)buf);
else if (ret < 0)
ret = -ERRNO_TO_PARA_ERROR(errno);
free(tmp);
/**
* Receive a buffer, decrypt it and write terminating NULL byte.
*
- * \param rc4c The rc4 crypt context.
+ * \param scc The context.
* \param buf The buffer to write the decrypted data to.
* \param size The size of \a buf.
*
- * Read at most \a size - 1 bytes from file descriptor given by \a rc4c,
- * decrypt the received data and write a NULL byte at the end of the decrypted
- * data.
+ * Read at most \a size - 1 bytes from file descriptor given by \a scc, decrypt
+ * the received data and write a NULL byte at the end of the decrypted data.
*
* \return The return value of the underlying call to \ref
- * rc4_recv_bin_buffer().
+ * sc_recv_bin_buffer().
*/
-int rc4_recv_buffer(struct rc4_context *rc4c, char *buf, size_t size)
+int sc_recv_buffer(struct stream_cipher_context *scc, char *buf, size_t size)
{
int n;
assert(size);
- n = rc4_recv_bin_buffer(rc4c, buf, size - 1);
+ n = sc_recv_bin_buffer(scc, buf, size - 1);
if (n >= 0)
buf[n] = '\0';
else
*buf = '\0';
return n;
}
+
+/**
+ * Compute the hash of the given input data.
+ *
+ * \param data Pointer to the data to compute the hash value from.
+ * \param len The length of \a data in bytes.
+ * \param hash Result pointer.
+ *
+ * \a hash must point to an area at least \p HASH_SIZE bytes large.
+ *
+ * \sa sha(3), openssl(1).
+ * */
+void hash_function(const char *data, unsigned long len, unsigned char *hash)
+{
+ SHA_CTX c;
+ SHA1_Init(&c);
+ SHA1_Update(&c, data, len);
+ SHA1_Final(hash, &c);
+}
projects / paraslash.git / blobdiff