X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fgcrypt%2Fcipher.c;h=c1ecf50a5c94f7cb82eedfae8a341c2f2a9546ef;hb=28b7a53b693f6b4e70218a926e68a36ece54cda1;hp=ce93fb1b8e60bf49d7e39fba3aba048eab2c1b1a;hpb=d917c8cb6b69475d568ccbe82389b9f2b3eb5e80;p=tinc diff --git a/src/gcrypt/cipher.c b/src/gcrypt/cipher.c index ce93fb1b..c1ecf50a 100644 --- a/src/gcrypt/cipher.c +++ b/src/gcrypt/cipher.c @@ -1,6 +1,6 @@ /* cipher.c -- Symmetric block cipher handling - Copyright (C) 2007 Guus Sliepen + Copyright (C) 2007-2022 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 @@ -17,11 +17,12 @@ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ -#include "system.h" +#include "../system.h" #include "cipher.h" -#include "logger.h" -#include "xalloc.h" +#include "../cipher.h" +#include "../logger.h" +#include "../xalloc.h" static struct { const char *name; @@ -36,26 +37,24 @@ static struct { {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_CFB, 93}, {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_OFB, 94}, - {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 418}, - {"aes", GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CBC, 419}, - {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CFB, 421}, - {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_OFB, 420}, + {"aes-128-ecb", GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 418}, + {"aes-128-cbc", GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CBC, 419}, + {"aes-128-cfb", GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CFB, 421}, + {"aes-128-ofb", GCRY_CIPHER_AES, GCRY_CIPHER_MODE_OFB, 420}, - {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_ECB, 422}, - {"aes192", GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CBC, 423}, - {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CFB, 425}, - {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_OFB, 424}, + {"aes-192-ecb", GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_ECB, 422}, + {"aes-192-cbc", GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CBC, 423}, + {"aes-192-cfb", GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CFB, 425}, + {"aes-192-ofb", GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_OFB, 424}, - {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_ECB, 426}, - {"aes256", GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CBC, 427}, - {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CFB, 429}, - {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, 428}, + {"aes-256-ecb", GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_ECB, 426}, + {"aes-256-cbc", GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CBC, 427}, + {"aes-256-cfb", GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CFB, 429}, + {"aes-256-ofb", GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, 428}, }; static bool nametocipher(const char *name, int *algo, int *mode) { - size_t i; - - for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) { + for(size_t i = 0; i < sizeof(ciphertable) / sizeof(*ciphertable); i++) { if(ciphertable[i].name && !strcasecmp(name, ciphertable[i].name)) { *algo = ciphertable[i].algo; *mode = ciphertable[i].mode; @@ -67,9 +66,7 @@ static bool nametocipher(const char *name, int *algo, int *mode) { } static bool nidtocipher(int nid, int *algo, int *mode) { - size_t i; - - for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) { + for(size_t i = 0; i < sizeof(ciphertable) / sizeof(*ciphertable); i++) { if(nid == ciphertable[i].nid) { *algo = ciphertable[i].algo; *mode = ciphertable[i].mode; @@ -81,9 +78,7 @@ static bool nidtocipher(int nid, int *algo, int *mode) { } static bool ciphertonid(int algo, int mode, int *nid) { - size_t i; - - for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) { + for(size_t i = 0; i < sizeof(ciphertable) / sizeof(*ciphertable); i++) { if(algo == ciphertable[i].algo && mode == ciphertable[i].mode) { *nid = ciphertable[i].nid; return true; @@ -102,7 +97,7 @@ static bool cipher_open(cipher_t *cipher, int algo, int mode) { } if((err = gcry_cipher_open(&cipher->handle, algo, mode, 0))) { - logger(DEBUG_ALWAYS, LOG_DEBUG, "Unable to intialise cipher %d mode %d: %s", algo, mode, gcry_strerror(err)); + logger(DEBUG_ALWAYS, LOG_DEBUG, "Unable to initialise cipher %d mode %d: %s", algo, mode, gcry_strerror(err)); return false; } @@ -136,31 +131,54 @@ bool cipher_open_by_nid(cipher_t *cipher, int nid) { return cipher_open(cipher, algo, mode); } -bool cipher_open_blowfish_ofb(cipher_t *cipher) { - return cipher_open(cipher, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_OFB); -} - void cipher_close(cipher_t *cipher) { if(cipher->handle) { gcry_cipher_close(cipher->handle); cipher->handle = NULL; } - if(cipher->key) { - free(cipher->key); - cipher->key = NULL; - } + free(cipher->key); + + memset(cipher, 0, sizeof(*cipher)); } size_t cipher_keylength(const cipher_t *cipher) { + if(!cipher) { + return 0; + } + return cipher->keylen + cipher->blklen; } -void cipher_get_key(const cipher_t *cipher, void *key) { - memcpy(key, cipher->key, cipher->keylen + cipher->blklen); +uint64_t cipher_budget(const cipher_t *cipher) { + if(!cipher) { + return UINT64_MAX; // NULL cipher + } + + size_t ivlen = cipher->blklen; + size_t blklen = cipher->blklen; + + size_t len = blklen > 1 + ? blklen + : ivlen > 1 ? ivlen : 8; + size_t bits = len * 4 - 1; + + return bits < 64 + ? UINT64_C(1) << bits + : UINT64_MAX; +} + +size_t cipher_blocksize(const cipher_t *cipher) { + if(!cipher || !cipher->blklen) { + return 1; + } + + return cipher->blklen; } bool cipher_set_key(cipher_t *cipher, void *key, bool encrypt) { + (void)encrypt; + memcpy(cipher->key, key, cipher->keylen + cipher->blklen); gcry_cipher_setkey(cipher->handle, cipher->key, cipher->keylen); @@ -170,19 +188,12 @@ bool cipher_set_key(cipher_t *cipher, void *key, bool encrypt) { } bool cipher_set_key_from_rsa(cipher_t *cipher, void *key, size_t len, bool encrypt) { - memcpy(cipher->key, key + len - cipher->keylen, cipher->keylen + cipher->blklen); - memcpy(cipher->key + cipher->keylen, key + len - cipher->keylen - cipher->blklen, cipher->blklen); + (void)encrypt; + memcpy(cipher->key, (char *)key + len - cipher->keylen, cipher->keylen); gcry_cipher_setkey(cipher->handle, cipher->key, cipher->keylen); - gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen); - - return true; -} -bool cipher_regenerate_key(cipher_t *cipher, bool encrypt) { - gcry_create_nonce(cipher->key, cipher->keylen + cipher->blklen); - - gcry_cipher_setkey(cipher->handle, cipher->key, cipher->keylen); + memcpy((char *)cipher->key + cipher->keylen, (char *)key + len - cipher->blklen - cipher->keylen, cipher->blklen); gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen); return true; @@ -193,8 +204,9 @@ bool cipher_encrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou uint8_t pad[cipher->blklen]; if(cipher->padding) { - if(!oneshot) + if(!oneshot) { return false; + } size_t reqlen = ((inlen + cipher->blklen) / cipher->blklen) * cipher->blklen; @@ -207,14 +219,16 @@ bool cipher_encrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou inlen = reqlen - cipher->blklen; for(int i = 0; i < cipher->blklen; i++) - if(i < cipher->blklen - padbyte) + if(i < cipher->blklen - padbyte) { pad[i] = ((uint8_t *)indata)[inlen + i]; - else + } else { pad[i] = padbyte; + } } - if(oneshot) + if(oneshot) { gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen); + } if((err = gcry_cipher_encrypt(cipher->handle, outdata, *outlen, indata, inlen))) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while encrypting: %s", gcry_strerror(err)); @@ -222,7 +236,7 @@ bool cipher_encrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou } if(cipher->padding) { - if((err = gcry_cipher_encrypt(cipher->handle, outdata + inlen, cipher->blklen, pad, cipher->blklen))) { + if((err = gcry_cipher_encrypt(cipher->handle, (char *)outdata + inlen, cipher->blklen, pad, cipher->blklen))) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while encrypting: %s", gcry_strerror(err)); return false; } @@ -237,8 +251,9 @@ 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) { gcry_error_t err; - if(oneshot) + if(oneshot) { gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen); + } if((err = gcry_cipher_decrypt(cipher->handle, outdata, *outlen, indata, inlen))) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while decrypting: %s", gcry_strerror(err)); @@ -246,8 +261,9 @@ bool cipher_decrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou } if(cipher->padding) { - if(!oneshot) + if(!oneshot) { return false; + } uint8_t padbyte = ((uint8_t *)outdata)[inlen - 1]; @@ -258,20 +274,25 @@ bool cipher_decrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou size_t origlen = inlen - padbyte; - for(int i = inlen - 1; i >= origlen; i--) + for(size_t i = inlen - 1; i >= origlen; i--) if(((uint8_t *)outdata)[i] != padbyte) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while decrypting: invalid padding"); return false; } *outlen = origlen; - } else + } else { *outlen = inlen; + } return true; } int cipher_get_nid(const cipher_t *cipher) { + if(!cipher || !cipher->nid) { + return 0; + } + return cipher->nid; }