X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fopenssl%2Fcipher.c;h=17ad408b317dd7465eb576c06c28040aa7708f33;hb=edc1efed3c0cf5aebb1c765066c0413757229a31;hp=1ca15abb1817693f9a37b73946f116bd9e90f94d;hpb=268c8545aaf83b7433f43402f5c77e39e20006ef;p=tinc diff --git a/src/openssl/cipher.c b/src/openssl/cipher.c index 1ca15abb..17ad408b 100644 --- a/src/openssl/cipher.c +++ b/src/openssl/cipher.c @@ -1,6 +1,6 @@ /* cipher.c -- Symmetric block cipher handling - Copyright (C) 2007 Guus Sliepen + Copyright (C) 2007-2016 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -17,71 +17,80 @@ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ -#include "system.h" +#include "../system.h" #include #include +#include + +#include "../cipher.h" +#include "../logger.h" +#include "../xalloc.h" + +struct cipher { + EVP_CIPHER_CTX *ctx; + const EVP_CIPHER *cipher; +}; + +static cipher_t *cipher_open(const EVP_CIPHER *evp_cipher) { + cipher_t *cipher = xzalloc(sizeof *cipher); + cipher->cipher = evp_cipher; + cipher->ctx = EVP_CIPHER_CTX_new(); + if(!cipher->ctx) + abort(); -#include "cipher.h" -#include "logger.h" -#include "xalloc.h" - -typedef struct cipher_counter { - unsigned char counter[EVP_MAX_IV_LENGTH]; - unsigned char block[EVP_MAX_IV_LENGTH]; - int n; -} cipher_counter_t; + return cipher; +} -static bool cipher_open(cipher_t *cipher) { - EVP_CIPHER_CTX_init(&cipher->ctx); +cipher_t *cipher_open_by_name(const char *name) { + const EVP_CIPHER *evp_cipher = EVP_get_cipherbyname(name); + if(!evp_cipher) { + logger(DEBUG_ALWAYS, LOG_ERR, "Unknown cipher name '%s'!", name); + return NULL; + } - return true; + return cipher_open(evp_cipher); } -bool cipher_open_by_name(cipher_t *cipher, const char *name) { - cipher->cipher = EVP_get_cipherbyname(name); - - if(cipher->cipher) - return cipher_open(cipher); +cipher_t *cipher_open_by_nid(int nid) { + const EVP_CIPHER *evp_cipher = EVP_get_cipherbynid(nid); + if(!evp_cipher) { + logger(DEBUG_ALWAYS, LOG_ERR, "Unknown cipher nid %d!", nid); + return NULL; + } - logger(DEBUG_ALWAYS, LOG_ERR, "Unknown cipher name '%s'!", name); - return false; + return cipher_open(evp_cipher); } -bool cipher_open_by_nid(cipher_t *cipher, int nid) { - cipher->cipher = EVP_get_cipherbynid(nid); - - if(cipher->cipher) - return cipher_open(cipher); +void cipher_close(cipher_t *cipher) { + if(!cipher) + return; - logger(DEBUG_ALWAYS, LOG_ERR, "Unknown cipher nid %d!", nid); - return false; + EVP_CIPHER_CTX_free(cipher->ctx); + free(cipher); } -bool cipher_open_blowfish_ofb(cipher_t *cipher) { - cipher->cipher = EVP_bf_ofb(); - return cipher_open(cipher); -} +size_t cipher_keylength(const cipher_t *cipher) { + if(!cipher || !cipher->cipher) + return 0; -void cipher_close(cipher_t *cipher) { - EVP_CIPHER_CTX_cleanup(&cipher->ctx); - if(cipher->counter) { - free(cipher->counter); - cipher->counter = 0; - } + return EVP_CIPHER_key_length(cipher->cipher) + EVP_CIPHER_iv_length(cipher->cipher); } -size_t cipher_keylength(const cipher_t *cipher) { - return cipher->cipher->key_len + cipher->cipher->block_size; +size_t cipher_blocksize(const cipher_t *cipher) { + if(!cipher || !cipher->cipher) + return 1; + + return EVP_CIPHER_block_size(cipher->cipher); } bool cipher_set_key(cipher_t *cipher, void *key, bool encrypt) { bool result; if(encrypt) - result = EVP_EncryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)key, (unsigned char *)key + cipher->cipher->key_len); + result = EVP_EncryptInit_ex(cipher->ctx, cipher->cipher, NULL, (unsigned char *)key, (unsigned char *)key + EVP_CIPHER_key_length(cipher->cipher)); else - result = EVP_DecryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)key, (unsigned char *)key + cipher->cipher->key_len); + result = EVP_DecryptInit_ex(cipher->ctx, cipher->cipher, NULL, (unsigned char *)key, (unsigned char *)key + EVP_CIPHER_key_length(cipher->cipher)); if(result) return true; @@ -94,9 +103,9 @@ bool cipher_set_key_from_rsa(cipher_t *cipher, void *key, size_t len, bool encry bool result; if(encrypt) - result = EVP_EncryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)key + len - cipher->cipher->key_len, (unsigned char *)key + len - cipher->cipher->iv_len - cipher->cipher->key_len); + result = EVP_EncryptInit_ex(cipher->ctx, cipher->cipher, NULL, (unsigned char *)key + len - EVP_CIPHER_key_length(cipher->cipher), (unsigned char *)key + len - EVP_CIPHER_iv_length(cipher->cipher) - EVP_CIPHER_key_length(cipher->cipher)); else - result = EVP_DecryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)key + len - cipher->cipher->key_len, (unsigned char *)key + len - cipher->cipher->iv_len - cipher->cipher->key_len); + result = EVP_DecryptInit_ex(cipher->ctx, cipher->cipher, NULL, (unsigned char *)key + len - EVP_CIPHER_key_length(cipher->cipher), (unsigned char *)key + len - EVP_CIPHER_iv_length(cipher->cipher) - EVP_CIPHER_key_length(cipher->cipher)); if(result) return true; @@ -105,82 +114,18 @@ bool cipher_set_key_from_rsa(cipher_t *cipher, void *key, size_t len, bool encry return false; } -bool cipher_set_counter(cipher_t *cipher, const void *counter, size_t len) { - if(len > cipher->cipher->block_size - 4) { - logger(DEBUG_ALWAYS, LOG_ERR, "Counter too long"); - abort(); - } - - memcpy(cipher->counter->counter + cipher->cipher->block_size - len, counter, len); - memset(cipher->counter->counter, 0, 4); - cipher->counter->n = 0; - - return true; -} - -bool cipher_set_counter_key(cipher_t *cipher, void *key) { - int result = EVP_EncryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)key, NULL); - if(!result) { - logger(DEBUG_ALWAYS, LOG_ERR, "Error while setting key: %s", ERR_error_string(ERR_get_error(), NULL)); - return false; - } - - if(!cipher->counter) - cipher->counter = xmalloc_and_zero(sizeof *cipher->counter); - else - cipher->counter->n = 0; - - memcpy(cipher->counter->counter, (unsigned char *)key + cipher->cipher->key_len, cipher->cipher->block_size); - - return true; -} - -bool cipher_counter_xor(cipher_t *cipher, const void *indata, size_t inlen, void *outdata) { - if(!cipher->counter) { - logger(DEBUG_ALWAYS, LOG_ERR, "Counter not initialized"); - return false; - } - - const unsigned char *in = indata; - unsigned char *out = outdata; - - while(inlen--) { - // Encrypt the new counter value if we need it - if(!cipher->counter->n) { - int len; - if(!EVP_EncryptUpdate(&cipher->ctx, cipher->counter->block, &len, cipher->counter->counter, cipher->cipher->block_size)) { - logger(DEBUG_ALWAYS, LOG_ERR, "Error while encrypting: %s", ERR_error_string(ERR_get_error(), NULL)); - return false; - } - - // Increase the counter value - for(int i = 0; i < cipher->cipher->block_size; i++) - if(++cipher->counter->counter[i]) - break; - } - - *out++ = *in++ ^ cipher->counter->counter[cipher->counter->n++]; - - if(cipher->counter->n >= cipher->cipher->block_size) - cipher->counter->n = 0; - } - - return true; -} - - bool cipher_encrypt(cipher_t *cipher, const void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot) { if(oneshot) { int len, pad; - if(EVP_EncryptInit_ex(&cipher->ctx, NULL, NULL, NULL, NULL) - && EVP_EncryptUpdate(&cipher->ctx, (unsigned char *)outdata, &len, indata, inlen) - && EVP_EncryptFinal(&cipher->ctx, (unsigned char *)outdata + len, &pad)) { + if(EVP_EncryptInit_ex(cipher->ctx, NULL, NULL, NULL, NULL) + && EVP_EncryptUpdate(cipher->ctx, (unsigned char *)outdata, &len, indata, inlen) + && EVP_EncryptFinal(cipher->ctx, (unsigned char *)outdata + len, &pad)) { if(outlen) *outlen = len + pad; return true; } } else { int len; - if(EVP_EncryptUpdate(&cipher->ctx, outdata, &len, indata, inlen)) { + if(EVP_EncryptUpdate(cipher->ctx, outdata, &len, indata, inlen)) { if(outlen) *outlen = len; return true; } @@ -193,15 +138,15 @@ bool cipher_encrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou bool cipher_decrypt(cipher_t *cipher, const void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot) { if(oneshot) { int len, pad; - if(EVP_DecryptInit_ex(&cipher->ctx, NULL, NULL, NULL, NULL) - && EVP_DecryptUpdate(&cipher->ctx, (unsigned char *)outdata, &len, indata, inlen) - && EVP_DecryptFinal(&cipher->ctx, (unsigned char *)outdata + len, &pad)) { + if(EVP_DecryptInit_ex(cipher->ctx, NULL, NULL, NULL, NULL) + && EVP_DecryptUpdate(cipher->ctx, (unsigned char *)outdata, &len, indata, inlen) + && EVP_DecryptFinal(cipher->ctx, (unsigned char *)outdata + len, &pad)) { if(outlen) *outlen = len + pad; return true; } } else { int len; - if(EVP_EncryptUpdate(&cipher->ctx, outdata, &len, indata, inlen)) { + if(EVP_EncryptUpdate(cipher->ctx, outdata, &len, indata, inlen)) { if(outlen) *outlen = len; return true; } @@ -212,9 +157,12 @@ bool cipher_decrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou } int cipher_get_nid(const cipher_t *cipher) { - return cipher->cipher ? cipher->cipher->nid : 0; + if(!cipher || !cipher->cipher) + return 0; + + return EVP_CIPHER_nid(cipher->cipher); } bool cipher_active(const cipher_t *cipher) { - return cipher->cipher && cipher->cipher->nid != 0; + return cipher && cipher->cipher && EVP_CIPHER_nid(cipher->cipher) != 0; }