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tlse.c
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/********************************************************************************
This software is available under your choice of one of the following licenses.
Choose whichever you prefer.
===============================================================================
License Choice 1 - The 2-Clause BSD License
===============================================================================
Copyright (c) 2016-2025, Eduard Suica
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or other
materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
===============================================================================
License Choice 2 - Public Domain (Unlicense)
===============================================================================
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.
In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
For more information, please refer to <http://unlicense.org/>
********************************************************************************/
#ifndef TLSE_C
#define TLSE_C
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <time.h>
#ifdef _WIN32
#ifdef SSL_COMPATIBLE_INTERFACE
#include <winsock2.h>
#endif
#include <windows.h>
#include <wincrypt.h>
#ifndef strcasecmp
#define strcasecmp stricmp
#endif
#else
// hton* and ntoh* functions
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#endif
#ifdef TLS_AMALGAMATION
#ifdef I
#pragma push_macro("I")
#define TLS_I_MACRO
#undef I
#endif
#include "libtomcrypt.c"
#ifdef TLS_I_MACRO
#pragma pop_macro("I")
#undef TLS_I_MACRO
#endif
#else
#include <tomcrypt.h>
#endif
#if (CRYPT <= 0x0117)
#define LTC_PKCS_1_EMSA LTC_LTC_PKCS_1_EMSA
#define LTC_PKCS_1_V1_5 LTC_LTC_PKCS_1_V1_5
#define LTC_PKCS_1_PSS LTC_LTC_PKCS_1_PSS
#endif
#ifdef WITH_KTLS
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
// should get /usr/include/linux/tls.h (linux headers)
// rename it to ktls.h and add it to your project
#include "ktls.h"
// or just include tls.h instead of ktls.h
// #include "linux/tls.h"
#endif
#include "tlse.h"
#ifndef TLS_FORWARD_SECRECY
#undef TLS_ECDSA_SUPPORTED
#endif
#ifndef TLS_ECDSA_SUPPORTED
// disable client ECDSA if not supported
#undef TLS_CLIENT_ECDSA
#endif
#define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
#define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
#define TLS_DHE_KEY_SIZE 2048
// you should never use weak DH groups (1024 bits)
// but if you have old devices (like grandstream ip phones)
// that can't handle 2048bit DHE, uncomment next lines
// and define TLS_WEAK_DH_LEGACY_DEVICES
// #ifdef TLS_WEAK_DH_LEGACY_DEVICES
// #define TLS_DH_DEFAULT_P "B10B8F96A080E01DDE92DE5EAE5D54EC52C99FBCFB06A3C69A6A9DCA52D23B616073E28675A23D189838EF1E2EE652C013ECB4AEA906112324975C3CD49B83BFACCBDD7D90C4BD7098488E9C219A73724EFFD6FAE5644738FAA31A4FF55BCCC0A151AF5F0DC8B4BD45BF37DF365C1A65E68CFDA76D4DA708DF1FB2BC2E4A4371"
// #define TLS_DH_DEFAULT_G "A4D1CBD5C3FD34126765A442EFB99905F8104DD258AC507FD6406CFF14266D31266FEA1E5C41564B777E690F5504F213160217B4B01B886A5E91547F9E2749F4D7FBD7D3B9A92EE1909D0D2263F80A76A6A24C087A091F531DBF0A0169B6A28AD662A4D18E73AFA32D779D5918D08BC8858F4DCEF97C2A24855E6EEB22B3B2E5"
// #define TLS_DHE_KEY_SIZE 1024
// #endif
#ifndef TLS_MALLOC
#define TLS_MALLOC(size) malloc(size)
#endif
#ifndef TLS_REALLOC
#define TLS_REALLOC(ptr, size) realloc(ptr, size)
#endif
#ifndef TLS_FREE
#define TLS_FREE(ptr) if (ptr) free(ptr)
#endif
#define TLS_ERROR(err, statement) if (err) statement;
#ifdef DEBUG
#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)
#define DEBUG_DUMP_HEX(buf, len) {if (buf) { int _i_; for (_i_ = 0; _i_ < len; _i_++) { DEBUG_PRINT("%02X ", (unsigned int)(buf)[_i_]); } } else { fprintf(stderr, "(null)"); } }
#define DEBUG_INDEX(fields) print_index(fields)
#define DEBUG_DUMP(buf, length) fwrite(buf, 1, length, stderr);
#define DEBUG_DUMP_HEX_LABEL(title, buf, len) {fprintf(stderr, "%s (%i): ", title, (int)len); DEBUG_DUMP_HEX(buf, len); fprintf(stderr, "\n");}
#else
#define DEBUG_PRINT(...) { }
#define DEBUG_DUMP_HEX(buf, len) { }
#define DEBUG_INDEX(fields) { }
#define DEBUG_DUMP(buf, length) { }
#define DEBUG_DUMP_HEX_LABEL(title, buf, len) { }
#endif
#ifndef htonll
#define htonll(x) ((1==htonl(1)) ? (x) : ((uint64_t)htonl((x) & 0xFFFFFFFF) << 32) | htonl((x) >> 32))
#endif
#ifndef ntohll
#define ntohll(x) ((1==ntohl(1)) ? (x) : ((uint64_t)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
#endif
#define TLS_CHANGE_CIPHER 0x14
#define TLS_ALERT 0x15
#define TLS_HANDSHAKE 0x16
#define TLS_APPLICATION_DATA 0x17
#define TLS_SERIALIZED_OBJECT 0xFE
#define TLS_CLIENT_HELLO_MINSIZE 41
#define TLS_CLIENT_RANDOM_SIZE 32
#define TLS_SERVER_RANDOM_SIZE 32
#define TLS_MAX_SESSION_ID 32
#define TLS_SHA256_MAC_SIZE 32
#define TLS_SHA1_MAC_SIZE 20
#define TLS_SHA384_MAC_SIZE 48
#define TLS_MAX_MAC_SIZE TLS_SHA384_MAC_SIZE
// 160
#define TLS_MAX_KEY_EXPANSION_SIZE 192
// 512bits (sha256) = 64 bytes
#define TLS_MAX_HASH_LEN 64
#define TLS_AES_IV_LENGTH 16
#define TLS_AES_BLOCK_SIZE 16
#define TLS_AES_GCM_IV_LENGTH 4
#define TLS_13_AES_GCM_IV_LENGTH 12
#define TLS_GCM_TAG_LEN 16
#define TLS_MAX_TAG_LEN 16
#define TLS_MIN_FINISHED_OPAQUE_LEN 12
#define TLS_BLOB_INCREMENT 0xFFF
#define TLS_ASN1_MAXLEVEL 0xFF
#define DTLS_COOKIE_SIZE 32
#define DTLS_MAX_FRAGMENT_SIZE 0x40000
#define TLS_MAX_SHA_SIZE 48
// 16(md5) + 20(sha1)
#define TLS_V11_HASH_SIZE 36
#define TLS_MAX_HASH_SIZE TLS_MAX_SHA_SIZE
// 16(md5) + 20(sha1)
#define TLS_MAX_RSA_KEY 2048
#define TLS_MAXTLS_APP_SIZE 0x4000
// max 1 second sleep
#define TLS_MAX_ERROR_SLEEP_uS 1000000
// max 5 seconds context sleep
#define TLS_MAX_ERROR_IDLE_S 5
#define TLS_V13_MAX_KEY_SIZE 32
#define TLS_V13_MAX_IV_SIZE 12
#define VERSION_SUPPORTED(version, err) if ((version != TLS_V13) && (version != TLS_V12) && (version != TLS_V11) && (version != TLS_V10) && (version != DTLS_V13) && (version != DTLS_V12) && (version != DTLS_V10)) { if ((version == SSL_V30) && (context->connection_status == 0)) { version = TLS_V12; } else { DEBUG_PRINT("UNSUPPORTED TLS VERSION %x\n", (int)version); return err;} }
#define CHECK_SIZE(size, buf_size, err) if (((int)(size) > (int)(buf_size)) || ((int)(buf_size) < 0)) { DEBUG_PRINT("[EXPECTED AT LEAST %i IN BUFFER OF SIZE %i]\n", (int)(size), (int)(buf_size)); return err; }
#define TLS_IMPORT_CHECK_SIZE(buf_pos, size, buf_size) if (((int)size > (int)buf_size - buf_pos) || ((int)buf_pos > (int)buf_size)) { DEBUG_PRINT("IMPORT ELEMENT SIZE ERROR\n"); tls_destroy_context(context); return NULL; }
#define CHECK_HANDSHAKE_STATE(context, n, limit) { if (context->hs_messages[n] >= limit) { if (context->dtls) { DEBUG_PRINT("* REPEATED MESSAGE, RE-HASHING\n"); _private_dtls_rehash(context, type); context->hs_messages[n]++;} else { DEBUG_PRINT("* UNEXPECTED MESSAGE (%i)\n", (int)n); payload_res = TLS_UNEXPECTED_MESSAGE; break; } } context->hs_messages[n]++; }
#define TLS_24_BIT(buf, index, val) { unsigned int u_val = (unsigned int)val; buf[index] = u_val / 0x10000; u_val %= 0x10000; buf[index + 1] = u_val / 0x100; u_val %= 0x100; buf[index + 2] = u_val; }
#if CRYPT >= 0x0118
#define TLS_TOMCRYPT_PRIVATE_DP(key) (&((key)->dp))
#define TLS_TOMCRYPT_PRIVATE_SET_INDEX(key, k_idx)
#else
#define TLS_TOMCRYPT_PRIVATE_DP(key) ((key)->dp)
#define TLS_TOMCRYPT_PRIVATE_SET_INDEX(key, k_idx) key->idx = k_idx
#endif
#ifdef TLS_WITH_CHACHA20_POLY1305
#define TLS_CHACHA20_IV_LENGTH 12
// ChaCha20 implementation by D. J. Bernstein
// Public domain.
#define CHACHA_MINKEYLEN 16
#define CHACHA_NONCELEN 8
#define CHACHA_NONCELEN_96 12
#define CHACHA_CTRLEN 8
#define CHACHA_CTRLEN_96 4
#define CHACHA_STATELEN (CHACHA_NONCELEN+CHACHA_CTRLEN)
#define CHACHA_BLOCKLEN 64
#define POLY1305_MAX_AAD 32
#define POLY1305_KEYLEN 32
#define POLY1305_TAGLEN 16
#define u_int unsigned int
#define uint8_t unsigned char
#define u_char unsigned char
#ifndef NULL
#define NULL (void *)0
#endif
#if (CRYPT >= 0x0117) && (0)
// to do: use ltc chacha/poly1305 implementation (working on big-endian machines)
#define chacha_ctx chacha20poly1305_state
#define poly1305_context poly1305_state
#define _private_tls_poly1305_init(ctx, key, len) poly1305_init(ctx, key, len)
#define _private_tls_poly1305_update(ctx, in, len) poly1305_process(ctx, in, len)
#define _private_tls_poly1305_finish(ctx, mac) poly1305_done(ctx, mac, 16)
#else
struct chacha_ctx {
u_int input[16];
uint8_t ks[CHACHA_BLOCKLEN];
uint8_t unused;
};
static inline void chacha_keysetup(struct chacha_ctx *x, const u_char *k, u_int kbits);
static inline void chacha_ivsetup(struct chacha_ctx *x, const u_char *iv, const u_char *ctr);
static inline void chacha_ivsetup_96bitnonce(struct chacha_ctx *x, const u_char *iv, const u_char *ctr);
static inline void chacha_encrypt_bytes(struct chacha_ctx *x, const u_char *m, u_char *c, u_int bytes);
static inline int poly1305_generate_key(unsigned char *key256, unsigned char *nonce, unsigned int noncelen, unsigned char *poly_key, unsigned int counter);
#define poly1305_block_size 16
#define poly1305_context poly1305_state_internal_t
//========== ChaCha20 from D. J. Bernstein ========= //
// Source available at https://cr.yp.to/chacha.html //
typedef unsigned char djb_u8;
typedef unsigned int djb_u32;
typedef struct chacha_ctx chacha_ctx;
#define U8C(v) (v##U)
#define U32C(v) (v##U)
#define U8V(v) ((djb_u8)(v) & U8C(0xFF))
#define U32V(v) ((djb_u32)(v) & U32C(0xFFFFFFFF))
#define ROTL32(v, n) \
(U32V((v) << (n)) | ((v) >> (32 - (n))))
#define _private_tls_U8TO32_LITTLE(p) \
(((djb_u32)((p)[0])) | \
((djb_u32)((p)[1]) << 8) | \
((djb_u32)((p)[2]) << 16) | \
((djb_u32)((p)[3]) << 24))
#define _private_tls_U32TO8_LITTLE(p, v) \
do { \
(p)[0] = U8V((v)); \
(p)[1] = U8V((v) >> 8); \
(p)[2] = U8V((v) >> 16); \
(p)[3] = U8V((v) >> 24); \
} while (0)
#define ROTATE(v,c) (ROTL32(v,c))
#define XOR(v,w) ((v) ^ (w))
#define PLUS(v,w) (U32V((v) + (w)))
#define PLUSONE(v) (PLUS((v),1))
#define QUARTERROUND(a,b,c,d) \
a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \
c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \
a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \
c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
static const char sigma[] = "expand 32-byte k";
static const char tau[] = "expand 16-byte k";
static inline void chacha_keysetup(chacha_ctx *x, const djb_u8 *k, djb_u32 kbits) {
const char *constants;
x->input[4] = _private_tls_U8TO32_LITTLE(k + 0);
x->input[5] = _private_tls_U8TO32_LITTLE(k + 4);
x->input[6] = _private_tls_U8TO32_LITTLE(k + 8);
x->input[7] = _private_tls_U8TO32_LITTLE(k + 12);
if (kbits == 256) { /* recommended */
k += 16;
constants = sigma;
} else { /* kbits == 128 */
constants = tau;
}
x->input[8] = _private_tls_U8TO32_LITTLE(k + 0);
x->input[9] = _private_tls_U8TO32_LITTLE(k + 4);
x->input[10] = _private_tls_U8TO32_LITTLE(k + 8);
x->input[11] = _private_tls_U8TO32_LITTLE(k + 12);
x->input[0] = _private_tls_U8TO32_LITTLE(constants + 0);
x->input[1] = _private_tls_U8TO32_LITTLE(constants + 4);
x->input[2] = _private_tls_U8TO32_LITTLE(constants + 8);
x->input[3] = _private_tls_U8TO32_LITTLE(constants + 12);
}
static inline void chacha_key(chacha_ctx *x, djb_u8 *k) {
_private_tls_U32TO8_LITTLE(k, x->input[4]);
_private_tls_U32TO8_LITTLE(k + 4, x->input[5]);
_private_tls_U32TO8_LITTLE(k + 8, x->input[6]);
_private_tls_U32TO8_LITTLE(k + 12, x->input[7]);
_private_tls_U32TO8_LITTLE(k + 16, x->input[8]);
_private_tls_U32TO8_LITTLE(k + 20, x->input[9]);
_private_tls_U32TO8_LITTLE(k + 24, x->input[10]);
_private_tls_U32TO8_LITTLE(k + 28, x->input[11]);
}
static inline void chacha_nonce(chacha_ctx *x, djb_u8 *nonce) {
_private_tls_U32TO8_LITTLE(nonce + 0, x->input[13]);
_private_tls_U32TO8_LITTLE(nonce + 4, x->input[14]);
_private_tls_U32TO8_LITTLE(nonce + 8, x->input[15]);
}
static inline void chacha_ivsetup(chacha_ctx *x, const djb_u8 *iv, const djb_u8 *counter) {
x->input[12] = counter == NULL ? 0 : _private_tls_U8TO32_LITTLE(counter + 0);
x->input[13] = counter == NULL ? 0 : _private_tls_U8TO32_LITTLE(counter + 4);
if (iv) {
x->input[14] = _private_tls_U8TO32_LITTLE(iv + 0);
x->input[15] = _private_tls_U8TO32_LITTLE(iv + 4);
}
}
static inline void chacha_ivsetup_96bitnonce(chacha_ctx *x, const djb_u8 *iv, const djb_u8 *counter) {
x->input[12] = counter == NULL ? 0 : _private_tls_U8TO32_LITTLE(counter + 0);
if (iv) {
x->input[13] = _private_tls_U8TO32_LITTLE(iv + 0);
x->input[14] = _private_tls_U8TO32_LITTLE(iv + 4);
x->input[15] = _private_tls_U8TO32_LITTLE(iv + 8);
}
}
static inline void chacha_ivupdate(chacha_ctx *x, const djb_u8 *iv, const djb_u8 *aad, const djb_u8 *counter) {
x->input[12] = counter == NULL ? 0 : _private_tls_U8TO32_LITTLE(counter + 0);
x->input[13] = _private_tls_U8TO32_LITTLE(iv + 0);
x->input[14] = _private_tls_U8TO32_LITTLE(iv + 4) ^ _private_tls_U8TO32_LITTLE(aad);
x->input[15] = _private_tls_U8TO32_LITTLE(iv + 8) ^ _private_tls_U8TO32_LITTLE(aad + 4);
}
static inline void chacha_encrypt_bytes(chacha_ctx *x, const djb_u8 *m, djb_u8 *c, djb_u32 bytes) {
djb_u32 x0, x1, x2, x3, x4, x5, x6, x7;
djb_u32 x8, x9, x10, x11, x12, x13, x14, x15;
djb_u32 j0, j1, j2, j3, j4, j5, j6, j7;
djb_u32 j8, j9, j10, j11, j12, j13, j14, j15;
djb_u8 *ctarget = NULL;
djb_u8 tmp[64];
u_int i;
if (!bytes)
return;
j0 = x->input[0];
j1 = x->input[1];
j2 = x->input[2];
j3 = x->input[3];
j4 = x->input[4];
j5 = x->input[5];
j6 = x->input[6];
j7 = x->input[7];
j8 = x->input[8];
j9 = x->input[9];
j10 = x->input[10];
j11 = x->input[11];
j12 = x->input[12];
j13 = x->input[13];
j14 = x->input[14];
j15 = x->input[15];
for (;;) {
if (bytes < 64) {
for (i = 0; i < bytes; ++i)
tmp[i] = m[i];
m = tmp;
ctarget = c;
c = tmp;
}
x0 = j0;
x1 = j1;
x2 = j2;
x3 = j3;
x4 = j4;
x5 = j5;
x6 = j6;
x7 = j7;
x8 = j8;
x9 = j9;
x10 = j10;
x11 = j11;
x12 = j12;
x13 = j13;
x14 = j14;
x15 = j15;
for (i = 20; i > 0; i -= 2) {
QUARTERROUND(x0, x4, x8, x12)
QUARTERROUND(x1, x5, x9, x13)
QUARTERROUND(x2, x6, x10, x14)
QUARTERROUND(x3, x7, x11, x15)
QUARTERROUND(x0, x5, x10, x15)
QUARTERROUND(x1, x6, x11, x12)
QUARTERROUND(x2, x7, x8, x13)
QUARTERROUND(x3, x4, x9, x14)
}
x0 = PLUS(x0, j0);
x1 = PLUS(x1, j1);
x2 = PLUS(x2, j2);
x3 = PLUS(x3, j3);
x4 = PLUS(x4, j4);
x5 = PLUS(x5, j5);
x6 = PLUS(x6, j6);
x7 = PLUS(x7, j7);
x8 = PLUS(x8, j8);
x9 = PLUS(x9, j9);
x10 = PLUS(x10, j10);
x11 = PLUS(x11, j11);
x12 = PLUS(x12, j12);
x13 = PLUS(x13, j13);
x14 = PLUS(x14, j14);
x15 = PLUS(x15, j15);
if (bytes < 64) {
_private_tls_U32TO8_LITTLE(x->ks + 0, x0);
_private_tls_U32TO8_LITTLE(x->ks + 4, x1);
_private_tls_U32TO8_LITTLE(x->ks + 8, x2);
_private_tls_U32TO8_LITTLE(x->ks + 12, x3);
_private_tls_U32TO8_LITTLE(x->ks + 16, x4);
_private_tls_U32TO8_LITTLE(x->ks + 20, x5);
_private_tls_U32TO8_LITTLE(x->ks + 24, x6);
_private_tls_U32TO8_LITTLE(x->ks + 28, x7);
_private_tls_U32TO8_LITTLE(x->ks + 32, x8);
_private_tls_U32TO8_LITTLE(x->ks + 36, x9);
_private_tls_U32TO8_LITTLE(x->ks + 40, x10);
_private_tls_U32TO8_LITTLE(x->ks + 44, x11);
_private_tls_U32TO8_LITTLE(x->ks + 48, x12);
_private_tls_U32TO8_LITTLE(x->ks + 52, x13);
_private_tls_U32TO8_LITTLE(x->ks + 56, x14);
_private_tls_U32TO8_LITTLE(x->ks + 60, x15);
}
x0 = XOR(x0, _private_tls_U8TO32_LITTLE(m + 0));
x1 = XOR(x1, _private_tls_U8TO32_LITTLE(m + 4));
x2 = XOR(x2, _private_tls_U8TO32_LITTLE(m + 8));
x3 = XOR(x3, _private_tls_U8TO32_LITTLE(m + 12));
x4 = XOR(x4, _private_tls_U8TO32_LITTLE(m + 16));
x5 = XOR(x5, _private_tls_U8TO32_LITTLE(m + 20));
x6 = XOR(x6, _private_tls_U8TO32_LITTLE(m + 24));
x7 = XOR(x7, _private_tls_U8TO32_LITTLE(m + 28));
x8 = XOR(x8, _private_tls_U8TO32_LITTLE(m + 32));
x9 = XOR(x9, _private_tls_U8TO32_LITTLE(m + 36));
x10 = XOR(x10, _private_tls_U8TO32_LITTLE(m + 40));
x11 = XOR(x11, _private_tls_U8TO32_LITTLE(m + 44));
x12 = XOR(x12, _private_tls_U8TO32_LITTLE(m + 48));
x13 = XOR(x13, _private_tls_U8TO32_LITTLE(m + 52));
x14 = XOR(x14, _private_tls_U8TO32_LITTLE(m + 56));
x15 = XOR(x15, _private_tls_U8TO32_LITTLE(m + 60));
j12 = PLUSONE(j12);
if (!j12) {
j13 = PLUSONE(j13);
/*
* Stopping at 2^70 bytes per nonce is the user's
* responsibility.
*/
}
_private_tls_U32TO8_LITTLE(c + 0, x0);
_private_tls_U32TO8_LITTLE(c + 4, x1);
_private_tls_U32TO8_LITTLE(c + 8, x2);
_private_tls_U32TO8_LITTLE(c + 12, x3);
_private_tls_U32TO8_LITTLE(c + 16, x4);
_private_tls_U32TO8_LITTLE(c + 20, x5);
_private_tls_U32TO8_LITTLE(c + 24, x6);
_private_tls_U32TO8_LITTLE(c + 28, x7);
_private_tls_U32TO8_LITTLE(c + 32, x8);
_private_tls_U32TO8_LITTLE(c + 36, x9);
_private_tls_U32TO8_LITTLE(c + 40, x10);
_private_tls_U32TO8_LITTLE(c + 44, x11);
_private_tls_U32TO8_LITTLE(c + 48, x12);
_private_tls_U32TO8_LITTLE(c + 52, x13);
_private_tls_U32TO8_LITTLE(c + 56, x14);
_private_tls_U32TO8_LITTLE(c + 60, x15);
if (bytes <= 64) {
if (bytes < 64) {
for (i = 0; i < bytes; ++i)
ctarget[i] = c[i];
}
x->input[12] = j12;
x->input[13] = j13;
x->unused = 64 - bytes;
return;
}
bytes -= 64;
c += 64;
m += 64;
}
}
static inline void chacha20_block(chacha_ctx *x, unsigned char *c, u_int len) {
u_int i;
unsigned int state[16];
for (i = 0; i < 16; i++)
state[i] = x->input[i];
for (i = 20; i > 0; i -= 2) {
QUARTERROUND(state[0], state[4], state[8], state[12])
QUARTERROUND(state[1], state[5], state[9], state[13])
QUARTERROUND(state[2], state[6], state[10], state[14])
QUARTERROUND(state[3], state[7], state[11], state[15])
QUARTERROUND(state[0], state[5], state[10], state[15])
QUARTERROUND(state[1], state[6], state[11], state[12])
QUARTERROUND(state[2], state[7], state[8], state[13])
QUARTERROUND(state[3], state[4], state[9], state[14])
}
for (i = 0; i < 16; i++)
x->input[i] = PLUS(x->input[i], state[i]);
for (i = 0; i < len; i += 4) {
_private_tls_U32TO8_LITTLE(c + i, x->input[i/4]);
}
}
static inline int poly1305_generate_key(unsigned char *key256, unsigned char *nonce, unsigned int noncelen, unsigned char *poly_key, unsigned int counter) {
struct chacha_ctx ctx;
uint64_t ctr;
memset(&ctx, 0, sizeof(ctx));
chacha_keysetup(&ctx, key256, 256);
switch (noncelen) {
case 8:
ctr = counter;
chacha_ivsetup(&ctx, nonce, (unsigned char *)&ctr);
break;
case 12:
chacha_ivsetup_96bitnonce(&ctx, nonce, (unsigned char *)&counter);
break;
default:
return -1;
}
chacha20_block(&ctx, poly_key, POLY1305_KEYLEN);
return 0;
}
/* 17 + sizeof(size_t) + 14*sizeof(unsigned long) */
typedef struct poly1305_state_internal_t {
unsigned long r[5];
unsigned long h[5];
unsigned long pad[4];
size_t leftover;
unsigned char buffer[poly1305_block_size];
unsigned char final;
} poly1305_state_internal_t;
/* interpret four 8 bit unsigned integers as a 32 bit unsigned integer in little endian */
static unsigned long _private_tls_U8TO32(const unsigned char *p) {
return
(((unsigned long)(p[0] & 0xff) ) |
((unsigned long)(p[1] & 0xff) << 8) |
((unsigned long)(p[2] & 0xff) << 16) |
((unsigned long)(p[3] & 0xff) << 24));
}
/* store a 32 bit unsigned integer as four 8 bit unsigned integers in little endian */
static void _private_tls_U32TO8(unsigned char *p, unsigned long v) {
p[0] = (v ) & 0xff;
p[1] = (v >> 8) & 0xff;
p[2] = (v >> 16) & 0xff;
p[3] = (v >> 24) & 0xff;
}
void _private_tls_poly1305_init(poly1305_context *ctx, const unsigned char key[32]) {
poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;
/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
st->r[0] = (_private_tls_U8TO32(&key[ 0]) ) & 0x3ffffff;
st->r[1] = (_private_tls_U8TO32(&key[ 3]) >> 2) & 0x3ffff03;
st->r[2] = (_private_tls_U8TO32(&key[ 6]) >> 4) & 0x3ffc0ff;
st->r[3] = (_private_tls_U8TO32(&key[ 9]) >> 6) & 0x3f03fff;
st->r[4] = (_private_tls_U8TO32(&key[12]) >> 8) & 0x00fffff;
/* h = 0 */
st->h[0] = 0;
st->h[1] = 0;
st->h[2] = 0;
st->h[3] = 0;
st->h[4] = 0;
/* save pad for later */
st->pad[0] = _private_tls_U8TO32(&key[16]);
st->pad[1] = _private_tls_U8TO32(&key[20]);
st->pad[2] = _private_tls_U8TO32(&key[24]);
st->pad[3] = _private_tls_U8TO32(&key[28]);
st->leftover = 0;
st->final = 0;
}
static void _private_tls_poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m, size_t bytes) {
const unsigned long hibit = (st->final) ? 0 : (1UL << 24); /* 1 << 128 */
unsigned long r0,r1,r2,r3,r4;
unsigned long s1,s2,s3,s4;
unsigned long h0,h1,h2,h3,h4;
unsigned long long d0,d1,d2,d3,d4;
unsigned long c;
r0 = st->r[0];
r1 = st->r[1];
r2 = st->r[2];
r3 = st->r[3];
r4 = st->r[4];
s1 = r1 * 5;
s2 = r2 * 5;
s3 = r3 * 5;
s4 = r4 * 5;
h0 = st->h[0];
h1 = st->h[1];
h2 = st->h[2];
h3 = st->h[3];
h4 = st->h[4];
while (bytes >= poly1305_block_size) {
/* h += m[i] */
h0 += (_private_tls_U8TO32(m+ 0) ) & 0x3ffffff;
h1 += (_private_tls_U8TO32(m+ 3) >> 2) & 0x3ffffff;
h2 += (_private_tls_U8TO32(m+ 6) >> 4) & 0x3ffffff;
h3 += (_private_tls_U8TO32(m+ 9) >> 6) & 0x3ffffff;
h4 += (_private_tls_U8TO32(m+12) >> 8) | hibit;
/* h *= r */
d0 = ((unsigned long long)h0 * r0) + ((unsigned long long)h1 * s4) + ((unsigned long long)h2 * s3) + ((unsigned long long)h3 * s2) + ((unsigned long long)h4 * s1);
d1 = ((unsigned long long)h0 * r1) + ((unsigned long long)h1 * r0) + ((unsigned long long)h2 * s4) + ((unsigned long long)h3 * s3) + ((unsigned long long)h4 * s2);
d2 = ((unsigned long long)h0 * r2) + ((unsigned long long)h1 * r1) + ((unsigned long long)h2 * r0) + ((unsigned long long)h3 * s4) + ((unsigned long long)h4 * s3);
d3 = ((unsigned long long)h0 * r3) + ((unsigned long long)h1 * r2) + ((unsigned long long)h2 * r1) + ((unsigned long long)h3 * r0) + ((unsigned long long)h4 * s4);
d4 = ((unsigned long long)h0 * r4) + ((unsigned long long)h1 * r3) + ((unsigned long long)h2 * r2) + ((unsigned long long)h3 * r1) + ((unsigned long long)h4 * r0);
/* (partial) h %= p */
c = (unsigned long)(d0 >> 26); h0 = (unsigned long)d0 & 0x3ffffff;
d1 += c; c = (unsigned long)(d1 >> 26); h1 = (unsigned long)d1 & 0x3ffffff;
d2 += c; c = (unsigned long)(d2 >> 26); h2 = (unsigned long)d2 & 0x3ffffff;
d3 += c; c = (unsigned long)(d3 >> 26); h3 = (unsigned long)d3 & 0x3ffffff;
d4 += c; c = (unsigned long)(d4 >> 26); h4 = (unsigned long)d4 & 0x3ffffff;
h0 += c * 5; c = (h0 >> 26); h0 = h0 & 0x3ffffff;
h1 += c;
m += poly1305_block_size;
bytes -= poly1305_block_size;
}
st->h[0] = h0;
st->h[1] = h1;
st->h[2] = h2;
st->h[3] = h3;
st->h[4] = h4;
}
void _private_tls_poly1305_finish(poly1305_context *ctx, unsigned char mac[16]) {
poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;
unsigned long h0,h1,h2,h3,h4,c;
unsigned long g0,g1,g2,g3,g4;
unsigned long long f;
unsigned long mask;
/* process the remaining block */
if (st->leftover) {
size_t i = st->leftover;
st->buffer[i++] = 1;
for (; i < poly1305_block_size; i++)
st->buffer[i] = 0;
st->final = 1;
_private_tls_poly1305_blocks(st, st->buffer, poly1305_block_size);
}
/* fully carry h */
h0 = st->h[0];
h1 = st->h[1];
h2 = st->h[2];
h3 = st->h[3];
h4 = st->h[4];
c = h1 >> 26; h1 = h1 & 0x3ffffff;
h2 += c; c = h2 >> 26; h2 = h2 & 0x3ffffff;
h3 += c; c = h3 >> 26; h3 = h3 & 0x3ffffff;
h4 += c; c = h4 >> 26; h4 = h4 & 0x3ffffff;
h0 += c * 5; c = h0 >> 26; h0 = h0 & 0x3ffffff;
h1 += c;
/* compute h + -p */
g0 = h0 + 5; c = g0 >> 26; g0 &= 0x3ffffff;
g1 = h1 + c; c = g1 >> 26; g1 &= 0x3ffffff;
g2 = h2 + c; c = g2 >> 26; g2 &= 0x3ffffff;
g3 = h3 + c; c = g3 >> 26; g3 &= 0x3ffffff;
g4 = h4 + c - (1UL << 26);
/* select h if h < p, or h + -p if h >= p */
mask = (g4 >> ((sizeof(unsigned long) * 8) - 1)) - 1;
g0 &= mask;
g1 &= mask;
g2 &= mask;
g3 &= mask;
g4 &= mask;
mask = ~mask;
h0 = (h0 & mask) | g0;
h1 = (h1 & mask) | g1;
h2 = (h2 & mask) | g2;
h3 = (h3 & mask) | g3;
h4 = (h4 & mask) | g4;
/* h = h % (2^128) */
h0 = ((h0 ) | (h1 << 26)) & 0xffffffff;
h1 = ((h1 >> 6) | (h2 << 20)) & 0xffffffff;
h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff;
h3 = ((h3 >> 18) | (h4 << 8)) & 0xffffffff;
/* mac = (h + pad) % (2^128) */
f = (unsigned long long)h0 + st->pad[0] ; h0 = (unsigned long)f;
f = (unsigned long long)h1 + st->pad[1] + (f >> 32); h1 = (unsigned long)f;
f = (unsigned long long)h2 + st->pad[2] + (f >> 32); h2 = (unsigned long)f;
f = (unsigned long long)h3 + st->pad[3] + (f >> 32); h3 = (unsigned long)f;
_private_tls_U32TO8(mac + 0, h0);
_private_tls_U32TO8(mac + 4, h1);
_private_tls_U32TO8(mac + 8, h2);
_private_tls_U32TO8(mac + 12, h3);
/* zero out the state */
st->h[0] = 0;
st->h[1] = 0;
st->h[2] = 0;
st->h[3] = 0;
st->h[4] = 0;
st->r[0] = 0;
st->r[1] = 0;
st->r[2] = 0;
st->r[3] = 0;
st->r[4] = 0;
st->pad[0] = 0;
st->pad[1] = 0;
st->pad[2] = 0;
st->pad[3] = 0;
}
void _private_tls_poly1305_update(poly1305_context *ctx, const unsigned char *m, size_t bytes) {
poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;
size_t i;
/* handle leftover */
if (st->leftover) {
size_t want = (poly1305_block_size - st->leftover);
if (want > bytes)
want = bytes;
for (i = 0; i < want; i++)
st->buffer[st->leftover + i] = m[i];
bytes -= want;
m += want;
st->leftover += want;
if (st->leftover < poly1305_block_size)
return;
_private_tls_poly1305_blocks(st, st->buffer, poly1305_block_size);
st->leftover = 0;
}
/* process full blocks */
if (bytes >= poly1305_block_size) {
size_t want = (bytes & ~(poly1305_block_size - 1));
_private_tls_poly1305_blocks(st, m, want);
m += want;
bytes -= want;
}
/* store leftover */
if (bytes) {
for (i = 0; i < bytes; i++)
st->buffer[st->leftover + i] = m[i];
st->leftover += bytes;
}
}
int poly1305_verify(const unsigned char mac1[16], const unsigned char mac2[16]) {
size_t i;
unsigned int dif = 0;
for (i = 0; i < 16; i++)
dif |= (mac1[i] ^ mac2[i]);
dif = (dif - 1) >> ((sizeof(unsigned int) * 8) - 1);
return (dif & 1);
}
void chacha20_poly1305_key(struct chacha_ctx *ctx, unsigned char *poly1305_key) {
unsigned char key[32];
unsigned char nonce[12];
chacha_key(ctx, key);
chacha_nonce(ctx, nonce);
poly1305_generate_key(key, nonce, sizeof(nonce), poly1305_key, 0);
}
int chacha20_poly1305_aead(struct chacha_ctx *ctx, unsigned char *pt, unsigned int len, unsigned char *aad, unsigned int aad_len, unsigned char *poly_key, unsigned char *out) {
static unsigned char zeropad[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
if (aad_len > POLY1305_MAX_AAD)
return -1;
unsigned int counter = 1;
chacha_ivsetup_96bitnonce(ctx, NULL, (unsigned char *)&counter);
chacha_encrypt_bytes(ctx, pt, out, len);
poly1305_context aead_ctx;
_private_tls_poly1305_init(&aead_ctx, poly_key);
_private_tls_poly1305_update(&aead_ctx, aad, aad_len);
int rem = aad_len % 16;
if (rem)
_private_tls_poly1305_update(&aead_ctx, zeropad, 16 - rem);
_private_tls_poly1305_update(&aead_ctx, out, len);
rem = len % 16;
if (rem)
_private_tls_poly1305_update(&aead_ctx, zeropad, 16 - rem);
unsigned char trail[16];
_private_tls_U32TO8(trail, aad_len);
*(int *)(trail + 4) = 0;
_private_tls_U32TO8(trail + 8, len);
*(int *)(trail + 12) = 0;
_private_tls_poly1305_update(&aead_ctx, trail, 16);
_private_tls_poly1305_finish(&aead_ctx, out + len);
return len + POLY1305_TAGLEN;
}
#endif
#endif
typedef enum {
KEA_dhe_dss,
KEA_dhe_rsa,
KEA_dh_anon,
KEA_rsa,
KEA_dh_dss,
KEA_dh_rsa,
KEA_ec_diffie_hellman
} KeyExchangeAlgorithm;
typedef enum {
rsa_sign = 1,
dss_sign = 2,
rsa_fixed_dh = 3,
dss_fixed_dh = 4,
rsa_ephemeral_dh_RESERVED = 5,
dss_ephemeral_dh_RESERVED = 6,
fortezza_dms_RESERVED = 20,
ecdsa_sign = 64,
rsa_fixed_ecdh = 65,
ecdsa_fixed_ecdh = 66
} TLSClientCertificateType;
typedef enum {
none = 0,
md5 = 1,
sha1 = 2,
sha224 = 3,
sha256 = 4,
sha384 = 5,
sha512 = 6,
_md5_sha1 = 255
} TLSHashAlgorithm;
#define TLS_HASH_ALGO_NUMBER (sha512 - sha256 + 1)
typedef enum {
anonymous = 0,
rsa_pkcs1 = 1,
ecdsa = 3,
rsa_pss = 8
} TLSSignatureAlgorithm;
#define TLS_SIGN_ALGO_NUMBER (3) // rsa_pkcs1, rsa_pss_rsae, ecdsa
struct _private_OID_chain {
void *top;
unsigned char *oid;
};
struct TLSCertificate {
unsigned short version;
unsigned int algorithm;
unsigned int key_algorithm;
unsigned int ec_algorithm;
unsigned char *exponent;
unsigned int exponent_len;
unsigned char *pk;
unsigned int pk_len;
unsigned char *priv;
unsigned int priv_len;
unsigned char *issuer_country;
unsigned char *issuer_state;
unsigned char *issuer_location;
unsigned char *issuer_entity;
unsigned char *issuer_subject;
unsigned char *not_before;
unsigned char *not_after;
unsigned char *country;
unsigned char *state;
unsigned char *location;
unsigned char *entity;
unsigned char *subject;
unsigned char **san;
unsigned short san_length;
unsigned char *ocsp;
unsigned char *serial_number;
unsigned int serial_len;
unsigned char *sign_key;
unsigned int sign_len;
unsigned char *fingerprint;
unsigned char *der_bytes;
unsigned int der_len;
unsigned char *bytes;
unsigned int len;
};
typedef struct {
union {
symmetric_CBC aes_local;
gcm_state aes_gcm_local;
#ifdef TLS_WITH_CHACHA20_POLY1305
chacha_ctx chacha_local;
#endif
} ctx_local;
union {
symmetric_CBC aes_remote;
gcm_state aes_gcm_remote;
#ifdef TLS_WITH_CHACHA20_POLY1305
chacha_ctx chacha_remote;
#endif
} ctx_remote;
union {
unsigned char local_mac[TLS_MAX_MAC_SIZE];
unsigned char local_aead_iv[TLS_AES_GCM_IV_LENGTH];
#ifdef WITH_TLS_13
unsigned char local_iv[TLS_13_AES_GCM_IV_LENGTH];
#endif
#ifdef TLS_WITH_CHACHA20_POLY1305
unsigned char local_nonce[TLS_CHACHA20_IV_LENGTH];
#endif
} ctx_local_mac;