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/*
WhatsApp plugin for Miranda NG
Copyright © 2019-22 George Hazan
*/
#include "stdafx.h"
MBinBuffer aesDecrypt(
const EVP_CIPHER *cipher,
const uint8_t *key,
const uint8_t *iv,
const void *data, size_t dataLen,
const void *additionalData, size_t additionalLen)
{
int tag_len = 0, dec_len = 0, final_len = 0;
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
EVP_DecryptInit_ex(ctx, cipher, NULL, key, iv);
if (additionalLen)
EVP_DecryptUpdate(ctx, nullptr, &tag_len, (uint8_t *)additionalData, (int)additionalLen);
if (cipher == EVP_aes_256_gcm()) {
dataLen -= 16;
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, 16, (uint8_t *)data + dataLen);
}
MBinBuffer ret;
uint8_t outbuf[2000];
for (size_t len = 0; len < dataLen; len += 1024) {
size_t portionSize = dataLen - len;
EVP_DecryptUpdate(ctx, outbuf, &dec_len, (uint8_t *)data + len, (int)min(portionSize, 1024));
ret.append(outbuf, dec_len);
}
EVP_DecryptFinal_ex(ctx, outbuf, &final_len);
if (final_len)
ret.append(outbuf, final_len);
EVP_CIPHER_CTX_free(ctx);
return ret;
}
MBinBuffer aesEncrypt(
const EVP_CIPHER *cipher,
const uint8_t *key,
const uint8_t *iv,
const void *data, size_t dataLen,
const void *additionalData, size_t additionalLen)
{
int tag_len = 0, dec_len = 0, final_len = 0;
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
EVP_EncryptInit_ex(ctx, cipher, NULL, key, iv);
if (additionalLen)
EVP_EncryptUpdate(ctx, nullptr, &tag_len, (uint8_t *)additionalData, (int)additionalLen);
if (cipher == EVP_aes_256_gcm()) {
dataLen -= 16;
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, 16, (uint8_t *)data + dataLen);
}
MBinBuffer ret;
uint8_t outbuf[2000];
for (size_t len = 0; len < dataLen; len += 1024) {
size_t portionSize = dataLen - len;
EVP_EncryptUpdate(ctx, outbuf, &dec_len, (uint8_t *)data + len, (int)min(portionSize, 1024));
ret.append(outbuf, dec_len);
}
EVP_EncryptFinal_ex(ctx, outbuf, &final_len);
if (final_len)
ret.append(outbuf, final_len);
EVP_CIPHER_CTX_free(ctx);
return ret;
}
/////////////////////////////////////////////////////////////////////////////////////////
static unsigned char *HKDF_Extract(const EVP_MD *evp_md,
const unsigned char *salt, size_t salt_len,
const unsigned char *key, size_t key_len,
unsigned char *prk, size_t *prk_len)
{
unsigned int tmp_len;
if (!HMAC(evp_md, salt, (int)salt_len, key, (int)key_len, prk, &tmp_len))
return NULL;
*prk_len = tmp_len;
return prk;
}
static unsigned char *HKDF_Expand(const EVP_MD *evp_md,
const unsigned char *prk, size_t prk_len,
const unsigned char *info, size_t info_len,
unsigned char *okm, size_t okm_len)
{
HMAC_CTX *hmac;
unsigned char *ret = NULL;
unsigned int i;
unsigned char prev[EVP_MAX_MD_SIZE];
size_t done_len = 0, dig_len = EVP_MD_size(evp_md);
size_t n = okm_len / dig_len;
if (okm_len % dig_len)
n++;
if (n > 255 || okm == NULL)
return NULL;
if ((hmac = HMAC_CTX_new()) == NULL)
return NULL;
if (!HMAC_Init_ex(hmac, prk, (int)prk_len, evp_md, NULL))
goto err;
for (i = 1; i <= n; i++) {
size_t copy_len;
const unsigned char ctr = i;
if (i > 1) {
if (!HMAC_Init_ex(hmac, NULL, 0, NULL, NULL))
goto err;
if (!HMAC_Update(hmac, prev, dig_len))
goto err;
}
if (!HMAC_Update(hmac, info, info_len))
goto err;
if (!HMAC_Update(hmac, &ctr, 1))
goto err;
if (!HMAC_Final(hmac, prev, NULL))
goto err;
copy_len = (done_len + dig_len > okm_len) ?
okm_len - done_len :
dig_len;
memcpy(okm + done_len, prev, copy_len);
done_len += copy_len;
}
ret = okm;
err:
OPENSSL_cleanse(prev, sizeof(prev));
HMAC_CTX_free(hmac);
return ret;
}
unsigned char *HKDF(const EVP_MD *evp_md,
const unsigned char *salt, size_t salt_len,
const unsigned char *key, size_t key_len,
const unsigned char *info, size_t info_len,
unsigned char *okm, size_t okm_len)
{
unsigned char prk[EVP_MAX_MD_SIZE];
unsigned char *ret;
size_t prk_len;
if (!HKDF_Extract(evp_md, salt, salt_len, key, key_len, prk, &prk_len))
return NULL;
ret = HKDF_Expand(evp_md, prk, prk_len, info, info_len, okm, okm_len);
OPENSSL_cleanse(prk, sizeof(prk));
return ret;
}
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