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235 lines
7.5 KiB
C
235 lines
7.5 KiB
C
/*
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* SRT - Secure, Reliable, Transport
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* Copyright (c) 2019 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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2019-06-27 (jdube)
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GnuTLS/Nettle CRYSPR/4SRT (CRYypto Service PRovider for SRT)
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*****************************************************************************/
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#include "hcrypt.h"
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#include <string.h>
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#include <mbedtls/aes.h>
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#include <mbedtls/md.h>
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#include <mbedtls/pkcs5.h>
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#include <mbedtls/entropy.h>
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// Static members of cryspr::mbedtls class.
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static mbedtls_ctr_drbg_context crysprMbedtls_ctr_drbg;
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static mbedtls_entropy_context crysprMbedtls_entropy;
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static mbedtls_md_context_t crysprMbedtls_mdctx;
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typedef struct tag_crysprGnuTLS_AES_cb {
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CRYSPR_cb ccb; /* CRYSPR control block */
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/* Add other cryptolib specific data here */
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} crysprMbedtls_cb;
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int crysprMbedtls_Prng(unsigned char *rn, int len)
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{
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int ret = mbedtls_ctr_drbg_random( &crysprMbedtls_ctr_drbg, rn, len );
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if (ret != 0)
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{
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return -1;
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}
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return 0;
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}
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int crysprMbedtls_AES_SetKey(
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bool bEncrypt, /* true:encrypt key, false:decrypt key*/
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const unsigned char *kstr, /* key string */
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size_t kstr_len, /* kstr length in bytes (16, 24, or 32 bytes, for AES128,AES192, or AES256) */
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CRYSPR_AESCTX *aes_key) /* Cryptolib Specific AES key context */
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{
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if (!(kstr_len == 16 || kstr_len == 24 || kstr_len == 32)) {
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HCRYPT_LOG(LOG_ERR, "%s", "AES_set_encrypt_key(kek) bad length\n");
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return -1;
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}
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int ret;
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// mbedtls uses the "bits" convention (128, 192, 254), just like openssl.
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// kstr_len is in "bytes" convention (16, 24, 32).
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if (bEncrypt) { /* Encrypt key */
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ret = mbedtls_aes_setkey_enc(aes_key, kstr, kstr_len*8);
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} else { /* Decrypt key */
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ret = mbedtls_aes_setkey_dec(aes_key, kstr, kstr_len*8);
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}
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return ret == 0 ? 0 : -1;
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}
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int crysprMbedtls_AES_EcbCipher( /* AES Electronic Codebook cipher*/
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bool bEncrypt, /* true:encrypt, false:decrypt */
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CRYSPR_AESCTX *aes_key, /* CryptoLib AES context */
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const unsigned char *indata,/* src (clear text)*/
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size_t inlen, /* length */
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unsigned char *out_txt, /* dst (cipher text) */
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size_t *outlen) /* dst len */
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{
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int nblk = inlen/CRYSPR_AESBLKSZ;
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int nmore = inlen%CRYSPR_AESBLKSZ;
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int i;
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if (bEncrypt) {
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/* Encrypt packet payload, block by block, in output buffer */
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for (i = 0; i < nblk; i++) {
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// NOTE: CRYSPR_AESBLKSZ is implicitly the ONLY POSSIBLE
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// size of the block.
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mbedtls_aes_crypt_ecb(aes_key, MBEDTLS_AES_ENCRYPT,
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&indata[(i*CRYSPR_AESBLKSZ)],
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&out_txt[(i*CRYSPR_AESBLKSZ)]);
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}
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/* Encrypt last incomplete block */
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if (0 < nmore) {
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unsigned char intxt[CRYSPR_AESBLKSZ];
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memcpy(intxt, &indata[(nblk*CRYSPR_AESBLKSZ)], nmore);
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memset(intxt+nmore, 0, CRYSPR_AESBLKSZ-nmore);
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mbedtls_aes_crypt_ecb(aes_key, MBEDTLS_AES_ENCRYPT,
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intxt,
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&out_txt[(nblk*CRYSPR_AESBLKSZ)]);
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nblk++;
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}
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if (outlen != NULL) *outlen = nblk*CRYSPR_AESBLKSZ;
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} else { /* Decrypt */
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for (i=0; i<nblk; i++){
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mbedtls_aes_crypt_ecb(aes_key, MBEDTLS_AES_DECRYPT,
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&indata[(i*CRYSPR_AESBLKSZ)],
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&out_txt[(i*CRYSPR_AESBLKSZ)]);
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}
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/* Encrypt last incomplete block */
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if (0 < nmore) {
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//shall not happens in decrypt
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}
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if (outlen != NULL) *outlen = nblk*CRYSPR_AESBLKSZ;
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}
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return 0;
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}
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int crysprMbedtls_AES_CtrCipher( /* AES-CTR128 Encryption */
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bool bEncrypt, /* true:encrypt, false:decrypt */
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CRYSPR_AESCTX *aes_key, /* CryptoLib AES context */
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unsigned char *iv, /* iv */
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const unsigned char *indata,/* src */
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size_t inlen, /* src length */
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unsigned char *out_txt) /* dest buffer[inlen] */
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{
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unsigned char ctr[CRYSPR_AESBLKSZ];
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size_t blk_ofs = 0;
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(void)bEncrypt; /* CTR mode encrypt for both encryption and decryption */
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memset(&ctr[0], 0, sizeof(ctr));
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mbedtls_aes_crypt_ctr(aes_key,
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inlen,
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&blk_ofs,
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iv,
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ctr,
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indata,
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out_txt);
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return 0;
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}
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/*
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* Password-based Key Derivation Function
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*/
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int crysprMbedtls_KmPbkdf2(
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CRYSPR_cb *cryspr_cb,
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char *passwd, /* passphrase */
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size_t passwd_len, /* passphrase len */
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unsigned char *salt, /* salt */
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size_t salt_len, /* salt_len */
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int itr, /* iterations */
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size_t key_len, /* key_len */
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unsigned char *out) /* derived key buffer[key_len]*/
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{
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(void)cryspr_cb;
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int ret = mbedtls_pkcs5_pbkdf2_hmac(&crysprMbedtls_mdctx,
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(unsigned char*)passwd, passwd_len, salt, salt_len,
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itr, key_len, out);
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if (ret == 0)
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return 0;
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// XXX report error, log?
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return -1;
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}
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static CRYSPR_methods crysprMbedtls_methods;
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CRYSPR_methods *crysprMbedtls(void)
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{
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if (crysprMbedtls_methods.open)
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return(&crysprMbedtls_methods);
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crysprInit(&crysprMbedtls_methods); /* Set default methods */
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/* CryptoLib Primitive API */
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crysprMbedtls_methods.prng = crysprMbedtls_Prng;
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crysprMbedtls_methods.aes_set_key = crysprMbedtls_AES_SetKey;
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#if CRYSPR_HAS_AESCTR
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crysprMbedtls_methods.aes_ctr_cipher = crysprMbedtls_AES_CtrCipher;
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#endif
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#if !(CRYSPR_HAS_AESCTR && CRYSPR_HAS_AESKWRAP)
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/* AES-ECB only required if cryspr has no AES-CTR or no AES KeyWrap */
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crysprMbedtls_methods.aes_ecb_cipher = crysprMbedtls_AES_EcbCipher;
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#endif
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#if !CRYSPR_HAS_PBKDF2
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crysprMbedtls_methods.sha1_msg_digest= crysprMbedtls_SHA1_MsgDigest; //Onl required if using generic KmPbkdf2
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#endif
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//--Crypto Session (Top API)
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// crysprMbedtls_methods.open =
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// crysprMbedtls_methods.close =
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//--Keying material (km) encryption
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crysprMbedtls_methods.km_pbkdf2 = crysprMbedtls_KmPbkdf2;
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// crysprMbedtls_methods.km_setkey =
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// crysprMbedtls_methods.km_wrap =
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// crysprMbedtls_methods.km_unwrap =
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//--Media stream (ms) encryption
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// crysprMbedtls_methods.ms_setkey =
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// crysprMbedtls_methods.ms_encrypt =
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// crysprMbedtls_methods.ms_decrypt =
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// Initialize extra static data
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mbedtls_entropy_init( &crysprMbedtls_entropy );
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mbedtls_ctr_drbg_init( &crysprMbedtls_ctr_drbg );
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int ret;
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if ( (ret = mbedtls_ctr_drbg_seed( &crysprMbedtls_ctr_drbg, mbedtls_entropy_func,
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&crysprMbedtls_entropy, NULL, 0)) != 0 )
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{
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HCRYPT_LOG(LOG_CRIT, "crysprMbedtls: STATIC INIT FAILED on mbedtls_ctr_drbg_init: -0x%04x", -ret);
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return NULL;
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}
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// Ok, mbedtls with all flexibility you couldn't make it more complicated.
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mbedtls_md_init(&crysprMbedtls_mdctx);
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const mbedtls_md_info_t* ifo = mbedtls_md_info_from_type(MBEDTLS_MD_SHA1);
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const int yes_use_hmac = 1;
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mbedtls_md_setup(&crysprMbedtls_mdctx, ifo, yes_use_hmac);
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return(&crysprMbedtls_methods);
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}
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