Beginnings of a crypto abstraction layer.

svn:r73

1 files changed, 74 insertions, 0 deletions

diff --git a/src/common/crypto.h b/src/common/crypto.h
new file mode 100644
index 0000000000..63615a13b9
--- /dev/null
+++ b/src/common/crypto.h
@@ -0,0 +1,74 @@
+/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
+/* See LICENSE for licensing information */
+/* $Id$ */
+
+#ifndef __CRYPTO_H
+#define __CRYPTO_H
+
+#include <openssl/err.h>
+#include <openssl/rsa.h>
+#include <openssl/pem.h>
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+
+/* available encryption primitives */
+#define CRYPTO_CIPHER_IDENTITY 0
+#define CRYPTO_CIPHER_DES 1
+#define CRYPTO_CIPHER_RC4 2
+
+#define CRYPTO_PK_RSA 0
+
+typedef struct 
+{
+  int type;
+  unsigned char *key;
+  /* auxiliary data structure(s) used by the underlying crypto library */
+  unsigned char *aux;
+} crypto_pk_env_t;
+
+typedef struct
+{
+  int type;
+  unsigned char *key;
+  unsigned char *iv;
+  /* auxiliary data structure(s) used by the underlying crypto library */
+  unsigned char *aux;
+} crypto_cipher_env_t;
+
+/* global state */
+int crypto_global_init();
+int crypto_global_cleanup();
+
+/* environment setup */
+crypto_pk_env_t *crypto_new_pk_env(int type);
+void crypto_free_pk_env(crypto_pk_env_t *env);
+
+crypto_cipher_env_t *crypto_new_cipher_env(int type);
+void crypto_free_cipher_env(crypto_cipher_env_t *env);
+
+/* public key crypto */
+int crypto_pk_generate_key(crypto_pk_env_t *env);
+
+int crypto_pk_read_private_key(crypto_pk_env_t *env, FILE *src);
+int crypto_pk_read_public_key(crypto_pk_env_t *env, FILE *src);
+int crypto_pk_write_private_key(crypto_pk_env_t *env, FILE *dest);
+int crypto_pk_write_public_key(crypto_pk_env_t *env, FILE *dest);
+
+int crypto_pk_set_key(crypto_pk_env_t *env, unsigned char *key);
+
+/* symmetric crypto */
+int crypto_cipher_set_iv(crypto_cipher_env_t *env, unsigned char *iv);
+int crypto_cipher_set_key(crypto_cipher_env_t *env, unsigned char *key);
+int crypto_cipher_init_cipher();
+
+int crypto_cipher_encrypt(crypto_cipher_env_t *env, unsigned char *from, unsigned int fromlen, unsigned char *to);
+int crypto_cipher_decrypt(crypto_cipher_env_t *env, unsigned char *from, unsigned int fromlen, unsigned char *to);
+
+/* SHA-1 */
+int crypto_SHA_digest(unsigned char *m, unsigned char *digest);
+
+/* random numbers */
+int crypto_rand(unsigned int n, unsigned char *to);
+int crypto_pseudo_rand(unsigned int n, unsigned char *to);
+
+#endif