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/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
/* $Id$ */
#include "crypto.h"
#include <stdlib.h>
#include <assert.h>
int crypto_global_init()
{
ERR_load_crypto_strings();
return 0;
}
int crypto_global_cleanup()
{
ERR_free_strings();
return 0;
}
crypto_pk_env_t *crypto_new_pk_env(int type)
{
crypto_pk_env_t *env;
env = (crypto_pk_env_t *)malloc(sizeof(crypto_pk_env_t));
if (!env)
return 0;
env->type = type;
env->key = NULL;
env->aux = NULL;
switch(type) {
case CRYPTO_PK_RSA:
env->key = (unsigned char *)RSA_new();
if (!env->key) {
free((void *)env);
return NULL;
}
break;
default:
free((void *)env);
return NULL;
break;
}
return env;
}
void crypto_free_pk_env(crypto_pk_env_t *env)
{
assert(env);
switch(env->type) {
case CRYPTO_PK_RSA:
if (env->key)
RSA_free((RSA *)env->key);
break;
default:
break;
}
free((void *)env);
return;
}
crypto_cipher_env_t *crypto_new_cipher_env(int type)
{
crypto_cipher_env_t *env;
env = (crypto_cipher_env_t *)malloc(sizeof(crypto_cipher_env_t));
if (!env)
return NULL;
env->type = type;
env->key = NULL;
env->iv = NULL;
env->aux = NULL;
switch(type) {
case CRYPTO_CIPHER_IDENTITY:
env->aux = (unsigned char *)malloc(sizeof(EVP_CIPHER_CTX));
if (!env->aux) {
free((void *)env);
return NULL;
}
EVP_CIPHER_CTX_init((EVP_CIPHER_CTX *)env->aux);
break;
case CRYPTO_CIPHER_DES:
env->aux = (unsigned char *)malloc(sizeof(EVP_CIPHER_CTX));
if (!env->aux) {
free((void *)env);
return NULL;
}
env->key = (unsigned char *)malloc(8);
if (!env->key) {
free((void *)env->aux);
free((void *)env);
return NULL;
}
env->iv = (unsigned char *)malloc(8);
if (!env->iv) {
free((void *)env->key);
free((void *)env->aux);
return NULL;
}
EVP_CIPHER_CTX_init((EVP_CIPHER_CTX *)env->aux);
break;
case CRYPTO_CIPHER_RC4:
env->aux = (unsigned char *)malloc(sizeof(EVP_CIPHER_CTX));
if (!env->aux) {
free((void *)env);
return NULL;
}
env->key = (unsigned char *)malloc(16);
if (!env->key) {
free((void *)env->aux);
free((void *)env);
return NULL;
}
env->iv = (unsigned char *)malloc(16);
if (!env->iv) {
free((void *)env->key);
free((void *)env->aux);
return NULL;
}
break;
EVP_CIPHER_CTX_init((EVP_CIPHER_CTX *)env->aux);
default:
free((void *)env);
return NULL;
break;
}
return env;
}
void crypto_free_cipher_env(crypto_cipher_env_t *env)
{
assert(env);
switch(env->type) {
case CRYPTO_CIPHER_IDENTITY:
if (env->aux) {
EVP_CIPHER_CTX_cleanup((EVP_CIPHER_CTX *)env->aux);
free((void *)env->aux);
}
break;
case CRYPTO_CIPHER_DES:
if (env->aux) {
EVP_CIPHER_CTX_cleanup((EVP_CIPHER_CTX *)env->aux);
free((void *)env->aux);
}
if (env->key)
free((void *)env->key);
if (env->iv)
free((void *)env->iv);
break;
case CRYPTO_CIPHER_RC4:
if (env->aux) {
EVP_CIPHER_CTX_cleanup((EVP_CIPHER_CTX *)env->aux);
free((void *)env->aux);
}
if (env->key)
free((void *)env->key);
if (env->iv)
free((void *)env->iv);
break;
default:
break;
}
free((void *)env);
return;
}
/* public key crypto */
int crypto_pk_generate_key(crypto_pk_env_t *env)
{
assert(env);
switch(env->type) {
case CRYPTO_PK_RSA:
if (env->key)
RSA_free((RSA *)env->key);
env->key = (unsigned char *)RSA_generate_key(1024,65535, NULL, NULL);
if (!env->key)
return -1;
break;
default:
return -1;
}
return 0;
}
int crypto_pk_read_private_key(crypto_pk_env_t *env, FILE *src)
{
assert(env && src);
switch(env->type) {
case CRYPTO_PK_RSA:
if (env->key)
RSA_free((RSA *)env->key);
env->key = (unsigned char *)PEM_read_RSAPrivateKey(src, (RSA **)&env->key, NULL, NULL);
if (!env->key)
return -1;
break;
default :
return -1;
}
return 0;
}
int crypto_pk_read_public_key(crypto_pk_env_t *env, FILE *src)
{
assert(env && src);
switch(env->type) {
case CRYPTO_PK_RSA:
if (env->key)
RSA_free((RSA *)env->key);
env->key = (unsigned char *)PEM_read_RSAPublicKey(src, (RSA **)&env->key, NULL, NULL);
if (!env->key)
return -1;
break;
default :
return -1;
}
return 0;
}
int crypto_pk_write_private_key(crypto_pk_env_t *env, FILE *dest)
{
assert(env && dest);
switch(env->type) {
case CRYPTO_PK_RSA:
if (!env->key)
return -1;
if (PEM_write_RSAPrivateKey(dest, (RSA *)env->key, NULL, NULL, 0,0, NULL) == 0)
return -1;
break;
default :
return -1;
}
return 0;
}
int crypto_pk_write_public_key(crypto_pk_env_t *env, FILE *dest)
{
assert(env && dest);
switch(env->type) {
case CRYPTO_PK_RSA:
if (!env->key)
return -1;
if (PEM_write_RSAPublicKey(dest, (RSA *)env->key) == 0)
return -1;
break;
default :
return -1;
}
return 0;
}
int crypto_pk_check_key(crypto_pk_env_t *env)
{
assert(env);
switch(env->type) {
case CRYPTO_PK_RSA:
return RSA_check_key((RSA *)env->key);
default:
return -1;
}
}
int crypto_pk_set_key(crypto_pk_env_t *env, unsigned char *key)
{
assert(env && key);
switch(env->type) {
case CRYPTO_PK_RSA:
if (env->key)
RSA_free((RSA *)env->key);
env->key = key;
break;
default :
return -1;
}
return 0;
}
int crypto_pk_public_encrypt(crypto_pk_env_t *env, unsigned char *from, int fromlen, unsigned char *to, int padding)
{
assert(env && from && to);
switch(env->type) {
case CRYPTO_PK_RSA:
return RSA_public_encrypt(fromlen, from, to, (RSA *)env->key, padding);
default:
return -1;
}
}
int crypto_pk_private_decrypt(crypto_pk_env_t *env, unsigned char *from, int fromlen, unsigned char *to, int padding)
{
assert(env && from && to);
switch(env->type) {
case CRYPTO_PK_RSA:
return RSA_private_decrypt(fromlen, from, to, (RSA *)env->key, padding);
default:
return -1;
}
}
/* symmetric crypto */
int crypto_cipher_set_iv(crypto_cipher_env_t *env, unsigned char *iv)
{
assert(env && iv);
switch(env->type) {
case CRYPTO_CIPHER_IDENTITY:
break;
case CRYPTO_CIPHER_DES:
case CRYPTO_CIPHER_RC4:
if (env->iv)
free((void *)env->iv);
env->iv = iv;
break;
default:
return -1;
}
return 0;
}
int crypto_cipher_set_key(crypto_cipher_env_t *env, unsigned char *key)
{
assert(env && key);
switch(env->type) {
case CRYPTO_CIPHER_IDENTITY:
break;
case CRYPTO_CIPHER_DES:
case CRYPTO_CIPHER_RC4:
if (env->key)
free((void *)env->key);
env->key = key;
break;
default:
return -1;
}
return 0;
}
int crypto_cipher_encrypt_init_cipher(crypto_cipher_env_t *env)
{
assert(env);
switch(env->type) {
case CRYPTO_CIPHER_IDENTITY:
return !(EVP_EncryptInit((EVP_CIPHER_CTX *)env->aux, EVP_enc_null(), env->key, env->iv));
case CRYPTO_CIPHER_DES:
return !(EVP_EncryptInit((EVP_CIPHER_CTX *)env->aux, EVP_des_ofb(), env->key, env->iv));
case CRYPTO_CIPHER_RC4:
return !(EVP_EncryptInit((EVP_CIPHER_CTX *)env->aux, EVP_rc4(), env->key, env->iv));
default:
return -1;
}
return 0;
}
int crypto_cipher_decrypt_init_cipher(crypto_cipher_env_t *env)
{
assert(env);
switch(env->type) {
case CRYPTO_CIPHER_IDENTITY:
return !(EVP_DecryptInit((EVP_CIPHER_CTX *)env->aux, EVP_enc_null(), env->key, env->iv));
case CRYPTO_CIPHER_DES:
return !(EVP_DecryptInit((EVP_CIPHER_CTX *)env->aux, EVP_des_ofb(), env->key, env->iv));
case CRYPTO_CIPHER_RC4:
return !(EVP_DecryptInit((EVP_CIPHER_CTX *)env->aux, EVP_rc4(), env->key, env->iv));
default:
return -1;
}
return 0;
}
int crypto_cipher_encrypt(crypto_cipher_env_t *env, unsigned char *from, unsigned int fromlen, unsigned char *to)
{
int tolen;
assert(env && from && to);
return !(EVP_EncryptUpdate((EVP_CIPHER_CTX *)env->aux, to, &tolen, from, fromlen));
}
int crypto_cipher_decrypt(crypto_cipher_env_t *env, unsigned char *from, unsigned int fromlen, unsigned char *to)
{
int tolen;
assert(env && from && to);
return !(EVP_DecryptUpdate((EVP_CIPHER_CTX *)env->aux, to, &tolen, from, fromlen));
}
/* SHA-1 */
int crypto_SHA_digest(unsigned char *m, int len, unsigned char *digest)
{
assert(m && digest);
return (SHA1(m,len,digest) == NULL);
}
/* random numbers */
int crypto_rand(unsigned int n, unsigned char *to)
{
assert(to);
return (RAND_bytes(to, n) == -1);
}
int crypto_pseudo_rand(unsigned int n, unsigned char *to)
{
assert(to);
return (RAND_pseudo_bytes(to, n) == -1);
}
/* errors */
char *crypto_perror()
{
return (char *)ERR_reason_error_string(ERR_get_error());
}
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