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/*
* SRT - Secure, Reliable, Transport
* Copyright (c) 2019 Haivision Systems Inc.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
/*****************************************************************************
written by
Haivision Systems Inc.
2019-06-26 (jdube)
OpenSSL CRYSPR/4SRT (CRYypto Service PRovider for SRT).
*****************************************************************************/
#include "hcrypt.h"
#include <string.h>
typedef struct tag_crysprOpenSSL_AES_cb {
CRYSPR_cb ccb;
/* Add cryptolib specific data here */
} crysprOpenSSL_cb;
int crysprOpenSSL_Prng(unsigned char *rn, int len)
{
return(RAND_bytes(rn, len) <= 0 ? -1 : 0);
}
int crysprOpenSSL_AES_SetKey(
bool bEncrypt, /* true Enxcrypt key, false: decrypt */
const unsigned char *kstr, /* key sttring*/
size_t kstr_len, /* kstr len in bytes (16, 24, or 32 bytes (for AES128,AES192, or AES256) */
CRYSPR_AESCTX *aes_key) /* CRYpto Service PRovider AES Key context */
{
if (bEncrypt) { /* Encrypt key */
if (AES_set_encrypt_key(kstr, kstr_len * 8, aes_key)) {
HCRYPT_LOG(LOG_ERR, "%s", "AES_set_encrypt_key(kek) failed\n");
return(-1);
}
} else { /* Decrypt key */
if (AES_set_decrypt_key(kstr, kstr_len * 8, aes_key)) {
HCRYPT_LOG(LOG_ERR, "%s", "AES_set_decrypt_key(kek) failed\n");
return(-1);
}
}
return(0);
}
#if !(CRYSPR_HAS_AESCTR && CRYSPR_HAS_AESKWRAP)
int crysprOpenSSL_AES_EcbCipher(
bool bEncrypt, /* true:encrypt, false:decrypt */
CRYSPR_AESCTX *aes_key, /* CRYpto Service PRovider AES Key context */
const unsigned char *indata,/* src (clear text if encrypt, cipher text otherwise)*/
size_t inlen, /* indata length */
unsigned char *out_txt, /* dst (cipher text if encrypt, clear text otherwise) */
size_t *outlen) /* in/out dst len */
{
int nblk = inlen/CRYSPR_AESBLKSZ;
int nmore = inlen%CRYSPR_AESBLKSZ;
size_t outsiz = (outlen ? *outlen : 0);
int i;
if (outsiz % CRYSPR_AESBLKSZ) return(-1); /* output buf size must be a multiple of AES block size (16) */
if (bEncrypt) {
if (outsiz > 16 && outsiz < (nblk+nmore)*CRYSPR_AESBLKSZ) return(-1); /* output buf size must have room for PKCS7 padding */
/* Encrypt packet payload, block by block, in output buffer */
for (i=0; i<nblk; i++){
AES_ecb_encrypt(&indata[(i*CRYSPR_AESBLKSZ)],
&out_txt[(i*CRYSPR_AESBLKSZ)], aes_key, AES_ENCRYPT);
}
/* Encrypt last incomplete block */
if (0 < nmore) {
unsigned char intxt[CRYSPR_AESBLKSZ];
/* PKCS7 padding: padding value is number of bytes padded */
memcpy(intxt, &indata[(nblk*CRYSPR_AESBLKSZ)], nmore);
memset(intxt+nmore, CRYSPR_AESBLKSZ-nmore, CRYSPR_AESBLKSZ-nmore);
AES_ecb_encrypt(intxt, &out_txt[(nblk*CRYSPR_AESBLKSZ)], aes_key, AES_ENCRYPT);
nblk++;
}
if (outlen != NULL) *outlen = nblk*CRYSPR_AESBLKSZ;
} else { /* Decrypt */
for (i=0; i<nblk; i++){
AES_ecb_encrypt(&indata[(i*CRYSPR_AESBLKSZ)],
&out_txt[(i*CRYSPR_AESBLKSZ)], aes_key, AES_DECRYPT);
}
/* Encrypt last incomplete block */
if (0 < nmore) {
//shall not happens in decrypt
}
if (outlen != NULL) *outlen = nblk*CRYSPR_AESBLKSZ;
}
return 0;
}
#endif /* !(CRYSPR_HAS_AESCTR && CRYSPR_HAS_AESKWRAP) */
int crysprOpenSSL_AES_CtrCipher(
bool bEncrypt, /* true:encrypt, false:decrypt */
CRYSPR_AESCTX *aes_key, /* CRYpto Service PRovider AES Key context */
unsigned char *iv, /* iv */
const unsigned char *indata,/* src */
size_t inlen, /* length */
unsigned char *out_txt) /* dest */
{
unsigned char ctr[CRYSPR_AESBLKSZ];
unsigned blk_ofs = 0;
(void)bEncrypt; /* CTR mode encrypt for both encryption and decryption */
memset(&ctr[0], 0, sizeof(ctr));
#if (OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(OPENSSL_IS_BORINGSSL))
CRYPTO_ctr128_encrypt(indata, out_txt,
inlen, aes_key, iv, ctr, &blk_ofs, (block128_f) AES_encrypt);
#else
AES_ctr128_encrypt(indata, out_txt,
inlen, aes_key, iv, ctr, &blk_ofs);
#endif
return 0;
}
/*
* Password-based Key Derivation Function
*/
int crysprOpenSSL_KmPbkdf2(
CRYSPR_cb *cryspr_cb,
char *passwd, /* passphrase */
size_t passwd_len, /* passphrase len */
unsigned char *salt, /* salt */
size_t salt_len, /* salt_len */
int itr, /* iterations */
size_t key_len, /* key_len */
unsigned char *out) /* derived key */
{
(void)cryspr_cb;
int rc = PKCS5_PBKDF2_HMAC_SHA1(passwd,passwd_len,salt,salt_len,itr,key_len,out);
return(rc == 1? 0 : -1);
}
#if CRYSPR_HAS_AESKWRAP
int crysprOpenSSL_KmWrap(CRYSPR_cb *cryspr_cb,
unsigned char *wrap,
const unsigned char *sek,
unsigned int seklen)
{
crysprOpenSSL_cb *aes_data = (crysprOpenSSL_cb *)cryspr_cb;
AES_KEY *kek = &aes_data->ccb.aes_kek; //key encrypting key
return(((seklen + HAICRYPT_WRAPKEY_SIGN_SZ) == (unsigned int)AES_wrap_key(kek, NULL, wrap, sek, seklen)) ? 0 : -1);
}
int crysprOpenSSL_KmUnwrap(
CRYSPR_cb *cryspr_cb,
unsigned char *sek, //Stream encrypting key
const unsigned char *wrap,
unsigned int wraplen)
{
crysprOpenSSL_cb *aes_data = (crysprOpenSSL_cb *)cryspr_cb;
AES_KEY *kek = &aes_data->ccb.aes_kek; //key encrypting key
return(((wraplen - HAICRYPT_WRAPKEY_SIGN_SZ) == (unsigned int)AES_unwrap_key(kek, NULL, sek, wrap, wraplen)) ? 0 : -1);
}
#endif /*CRYSPR_HAS_AESKWRAP*/
static CRYSPR_methods crysprOpenSSL_methods;
CRYSPR_methods *crysprOpenSSL(void)
{
if(NULL == crysprOpenSSL_methods.open) {
crysprInit(&crysprOpenSSL_methods); //Default/fallback methods
crysprOpenSSL_methods.prng = crysprOpenSSL_Prng;
//--CryptoLib Primitive API-----------------------------------------------
crysprOpenSSL_methods.aes_set_key = crysprOpenSSL_AES_SetKey;
#if CRYSPR_HAS_AESCTR
crysprOpenSSL_methods.aes_ctr_cipher = crysprOpenSSL_AES_CtrCipher;
#endif
#if !(CRYSPR_HAS_AESCTR && CRYSPR_HAS_AESKWRAP)
/* AES-ECB only required if cryspr has no AES-CTR and no AES KeyWrap */
/* OpenSSL has both AESCTR and AESKWRP and the AESECB wrapper is only used
to test the falback methods */
crysprOpenSSL_methods.aes_ecb_cipher = crysprOpenSSL_AES_EcbCipher;
#endif
#if !CRYSPR_HAS_PBKDF2
crysprOpenSSL_methods.sha1_msg_digest= NULL; //Required to use eventual default/fallback KmPbkdf2
#endif
//--Crypto Session API-----------------------------------------
// crysprOpenSSL_methods.open =
// crysprOpenSSL_methods.close =
//--Keying material (km) encryption
#if CRYSPR_HAS_PBKDF2
crysprOpenSSL_methods.km_pbkdf2 = crysprOpenSSL_KmPbkdf2;
#else
#error There is no default/fallback method for PBKDF2
#endif
// crysprOpenSSL_methods.km_setkey =
#if CRYSPR_HAS_AESKWRAP
crysprOpenSSL_methods.km_wrap = crysprOpenSSL_KmWrap;
crysprOpenSSL_methods.km_unwrap = crysprOpenSSL_KmUnwrap;
#endif
//--Media stream (ms) encryption
// crysprOpenSSL_methods.ms_setkey =
// crysprOpenSSL_methods.ms_encrypt =
// crysprOpenSSL_methods.ms_decrypt =
}
return(&crysprOpenSSL_methods);
}