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98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/*
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* SRT - Secure, Reliable, Transport
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* Copyright (c) 2018 Haivision Systems Inc.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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*/
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/*****************************************************************************
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written by
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Haivision Systems Inc.
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2011-06-23 (jdube)
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HaiCrypt initial implementation.
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2014-03-11 (jdube)
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Adaptation for SRT.
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*****************************************************************************/
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#ifndef HCRYPT_CTX_H
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#define HCRYPT_CTX_H
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#include <stdbool.h>
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#include <sys/types.h>
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#include "hcrypt.h"
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#if !defined(HAISRT_VERSION_INT)
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#include "haicrypt.h"
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#include "hcrypt_msg.h"
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#else
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// Included by haisrt.h or similar
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#include "haisrt/haicrypt.h"
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#include "haisrt/hcrypt_msg.h"
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#endif
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typedef struct {
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unsigned char *pfx; //Prefix described by transport msg info (in ctx)
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unsigned char *payload;
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size_t len; //Payload size
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}hcrypt_DataDesc;
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typedef struct tag_hcrypt_Ctx {
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struct tag_hcrypt_Ctx * alt; /* Alternative ctx (even/odd) */
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#define HCRYPT_CTX_F_MSG 0x00FF /* Aligned with message header flags */
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#define HCRYPT_CTX_F_eSEK HCRYPT_MSG_F_eSEK
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#define HCRYPT_CTX_F_oSEK HCRYPT_MSG_F_oSEK
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#define HCRYPT_CTX_F_xSEK HCRYPT_MSG_F_xSEK
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#define HCRYPT_CTX_F_ENCRYPT 0x0100 /* 0:decrypt 1:encrypt */
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#define HCRYPT_CTX_F_ANNOUNCE 0x0200 /* Announce KM */
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#define HCRYPT_CTX_F_TTSEND 0x0400 /* time to send */
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unsigned flags;
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#define hcryptCtx_GetKeyFlags(ctx) ((ctx)->flags & HCRYPT_CTX_F_xSEK)
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#define hcryptCtx_GetKeyIndex(ctx) (((ctx)->flags & HCRYPT_CTX_F_xSEK)>>1)
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#define HCRYPT_CTX_S_INIT 1
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#define HCRYPT_CTX_S_SARDY 2 /* Security Association (KEK) ready */
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#define HCRYPT_CTX_S_KEYED 3 /* Media Stream Encrypting Key (SEK) ready */
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#define HCRYPT_CTX_S_ACTIVE 4 /* Announced and in use */
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#define HCRYPT_CTX_S_DEPRECATED 5 /* Still announced but no longer used */
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unsigned status;
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#define HCRYPT_CTX_MODE_CLRTXT 0 /* NULL cipher (for tests) */
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#define HCRYPT_CTX_MODE_AESECB 1 /* Electronic Code Book mode */
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#define HCRYPT_CTX_MODE_AESCTR 2 /* Counter mode */
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#define HCRYPT_CTX_MODE_AESCBC 3 /* Cipher-block chaining mode */
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#define HCRYPT_CTX_MODE_AESGCM 4 /* AES GCM authenticated encryption */
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unsigned mode;
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struct {
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size_t key_len;
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size_t pwd_len;
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char pwd[HAICRYPT_PWD_MAX_SZ];
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} cfg;
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size_t salt_len;
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unsigned char salt[HAICRYPT_SALT_SZ];
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size_t sek_len;
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unsigned char sek[HAICRYPT_KEY_MAX_SZ];
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hcrypt_MsgInfo * msg_info; /* Transport message handler */
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unsigned pkt_cnt; /* Key usage counter */
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#define HCRYPT_CTX_MAX_KM_PFX_SZ 16
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size_t KMmsg_len;
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unsigned char KMmsg_cache[HCRYPT_CTX_MAX_KM_PFX_SZ + HCRYPT_MSG_KM_MAX_SZ];
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#define HCRYPT_CTX_MAX_MS_PFX_SZ 16
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unsigned char MSpfx_cache[HCRYPT_CTX_MAX_MS_PFX_SZ];
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} hcrypt_Ctx;
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#endif /* HCRYPT_CTX_H */
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