Alawn/shadowsocks-libev
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This commit is contained in:
Max Lv
2013-07-28 17:29:37 +08:00
parent c2302b432a
commit d4b000090f
4 changed files with 266 additions and 243 deletions
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src/encrypt.c
+53 -7
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@@ -150,8 +150,29 @@ void enc_table_init(const char *pass) {
}
}
char* ss_encrypt_all(int buf_size, char *plaintext, ssize_t *len, struct enc_ctx *ctx) {
if (ctx != NULL) {
char* ss_encrypt_all(int buf_size, char *plaintext, ssize_t *len, int method) {
if (method > TABLE) {
const EVP_CIPHER *cipher = EVP_get_cipherbyname(supported_ciphers[method]);
if (cipher == NULL) {
LOGE("Cipher %s not found in OpenSSL library", supported_ciphers[method]);
FATAL("Cannot initialize cipher");
}
EVP_CIPHER_CTX evp;
EVP_CIPHER_CTX_init(&evp);
if (!EVP_CipherInit_ex&(evp, cipher, NULL, NULL, NULL, enc)) {
LOGE("Cannot initialize cipher %s", supported_ciphers[method]);
exit(EXIT_FAILURE);
}
if (!EVP_CIPHER_CTX_set_key_length(&evp, enc_key_len)) {
EVP_CIPHER_CTX_cleanup(&evp);
LOGE("Invalid key length: %d", enc_key_len);
exit(EXIT_FAILURE);
}
if (method > RC4) {
EVP_CIPHER_CTX_set_padding(&evp, 1);
}
int c_len = *len + BLOCK_SIZE;
int iv_len = 0;
int err = 0;
@@ -160,9 +181,8 @@ char* ss_encrypt_all(int buf_size, char *plaintext, ssize_t *len, struct enc_ctx
uint8_t iv[EVP_MAX_IV_LENGTH];
iv_len = enc_iv_len;
RAND_bytes(iv, iv_len);
EVP_CipherInit_ex(&ctx->evp, NULL, NULL, enc_key, iv, 1);
EVP_CipherInit_ex(&evp, NULL, NULL, enc_key, iv, 1);
memcpy(ciphertext, iv, iv_len);
ctx->init = 1;
#ifdef DEBUG
dump("IV", iv);
@@ -174,6 +194,7 @@ char* ss_encrypt_all(int buf_size, char *plaintext, ssize_t *len, struct enc_ctx
if (!err) {
free(ciphertext);
free(plaintext);
EVP_CIPHER_CTX_cleanup(&evp);
return NULL;
}
@@ -184,6 +205,8 @@ char* ss_encrypt_all(int buf_size, char *plaintext, ssize_t *len, struct enc_ctx
*len = iv_len + c_len;
free(plaintext);
EVP_CIPHER_CTX_cleanup(&evp);
return ciphertext;
} else {
@@ -240,8 +263,29 @@ char* ss_encrypt(int buf_size, char *plaintext, ssize_t *len, struct enc_ctx *ct
}
}
char* ss_decrypt_all(int buf_size, char *ciphertext, ssize_t *len, struct enc_ctx *ctx) {
if (ctx != NULL) {
char* ss_decrypt_all(int buf_size, char *ciphertext, ssize_t *len, int method) {
if (method > TABLE) {
const EVP_CIPHER *cipher = EVP_get_cipherbyname(supported_ciphers[method]);
if (cipher == NULL) {
LOGE("Cipher %s not found in OpenSSL library", supported_ciphers[method]);
FATAL("Cannot initialize cipher");
}
EVP_CIPHER_CTX evp;
EVP_CIPHER_CTX_init(&evp);
if (!EVP_CipherInit_ex&(evp, cipher, NULL, NULL, NULL, enc)) {
LOGE("Cannot initialize cipher %s", supported_ciphers[method]);
exit(EXIT_FAILURE);
}
if (!EVP_CIPHER_CTX_set_key_length(&evp, enc_key_len)) {
EVP_CIPHER_CTX_cleanup(&evp);
LOGE("Invalid key length: %d", enc_key_len);
exit(EXIT_FAILURE);
}
if (method > RC4) {
EVP_CIPHER_CTX_set_padding(&evp, 1);
}
int p_len = *len + BLOCK_SIZE;
int iv_len = 0;
int err = 0;
@@ -250,7 +294,7 @@ char* ss_decrypt_all(int buf_size, char *ciphertext, ssize_t *len, struct enc_ct
uint8_t iv[EVP_MAX_IV_LENGTH];
iv_len = enc_iv_len;
memcpy(iv, ciphertext, iv_len);
EVP_CipherInit_ex(&ctx->evp, NULL, NULL, enc_key, iv, 0);
EVP_CipherInit_ex(&evp, NULL, NULL, enc_key, iv, 0);
#ifdef DEBUG
dump("IV", iv);
@@ -261,6 +305,7 @@ char* ss_decrypt_all(int buf_size, char *ciphertext, ssize_t *len, struct enc_ct
if (!err) {
free(ciphertext);
free(plaintext);
EVP_CIPHER_CTX_cleanup(&evp);
return NULL;
}
@@ -271,6 +316,7 @@ char* ss_decrypt_all(int buf_size, char *ciphertext, ssize_t *len, struct enc_ct
*len = p_len;
free(ciphertext);
EVP_CIPHER_CTX_cleanup(&evp);
return plaintext;
} else {
char *begin = ciphertext;