748 lines
16 KiB
C
748 lines
16 KiB
C
/**
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* WinPR: Windows Portable Runtime
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*
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* Copyright 2015 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <winpr/config.h>
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#include <winpr/crt.h>
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#include <winpr/assert.h>
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#include <winpr/crypto.h>
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#include "../log.h"
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#define TAG WINPR_TAG("crypto.cipher")
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#if defined(WITH_INTERNAL_RC4)
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#include "rc4.h"
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#endif
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#ifdef WITH_OPENSSL
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#include <openssl/aes.h>
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#include <openssl/rc4.h>
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#include <openssl/des.h>
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#include <openssl/evp.h>
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#endif
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#ifdef WITH_MBEDTLS
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#include <mbedtls/md.h>
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#include <mbedtls/aes.h>
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#include <mbedtls/des.h>
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#include <mbedtls/cipher.h>
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#if MBEDTLS_VERSION_MAJOR < 3
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#define mbedtls_cipher_info_get_iv_size(_info) (_info->iv_size)
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#define mbedtls_cipher_info_get_key_bitlen(_info) (_info->key_bitlen)
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#endif
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#endif
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/**
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* RC4
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*/
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struct winpr_rc4_ctx_private_st
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{
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#if defined(WITH_INTERNAL_RC4)
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winpr_int_RC4_CTX* ictx;
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#else
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#if defined(WITH_OPENSSL)
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EVP_CIPHER_CTX* ctx;
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#endif
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#endif
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};
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static WINPR_RC4_CTX* winpr_RC4_New_Internal(const BYTE* key, size_t keylen, BOOL override_fips)
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{
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if (!key || (keylen == 0))
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return NULL;
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WINPR_RC4_CTX* ctx = (WINPR_RC4_CTX*)calloc(1, sizeof(WINPR_RC4_CTX));
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if (!ctx)
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return NULL;
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#if defined(WITH_INTERNAL_RC4)
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WINPR_UNUSED(override_fips);
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ctx->ictx = winpr_int_rc4_new(key, keylen);
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if (!ctx->ictx)
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goto fail;
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#elif defined(WITH_OPENSSL)
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const EVP_CIPHER* evp = NULL;
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if (keylen > INT_MAX)
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goto fail;
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ctx->ctx = EVP_CIPHER_CTX_new();
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if (!ctx->ctx)
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goto fail;
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evp = EVP_rc4();
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if (!evp)
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goto fail;
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EVP_CIPHER_CTX_reset(ctx->ctx);
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if (EVP_EncryptInit_ex(ctx->ctx, evp, NULL, NULL, NULL) != 1)
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goto fail;
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/* EVP_CIPH_FLAG_NON_FIPS_ALLOW does not exist before openssl 1.0.1 */
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#if !(OPENSSL_VERSION_NUMBER < 0x10001000L)
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if (override_fips == TRUE)
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EVP_CIPHER_CTX_set_flags(ctx->ctx, EVP_CIPH_FLAG_NON_FIPS_ALLOW);
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#endif
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EVP_CIPHER_CTX_set_key_length(ctx->ctx, (int)keylen);
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if (EVP_EncryptInit_ex(ctx->ctx, NULL, NULL, key, NULL) != 1)
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goto fail;
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#endif
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return ctx;
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fail:
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WINPR_PRAGMA_DIAG_PUSH
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WINPR_PRAGMA_DIAG_IGNORED_MISMATCHED_DEALLOC
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winpr_RC4_Free(ctx);
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WINPR_PRAGMA_DIAG_POP
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return NULL;
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}
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WINPR_RC4_CTX* winpr_RC4_New_Allow_FIPS(const void* key, size_t keylen)
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{
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return winpr_RC4_New_Internal(key, keylen, TRUE);
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}
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WINPR_RC4_CTX* winpr_RC4_New(const void* key, size_t keylen)
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{
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return winpr_RC4_New_Internal(key, keylen, FALSE);
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}
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BOOL winpr_RC4_Update(WINPR_RC4_CTX* ctx, size_t length, const void* input, void* output)
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{
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WINPR_ASSERT(ctx);
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#if defined(WITH_INTERNAL_RC4)
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return winpr_int_rc4_update(ctx->ictx, length, input, output);
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#elif defined(WITH_OPENSSL)
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WINPR_ASSERT(ctx->ctx);
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int outputLength = 0;
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if (length > INT_MAX)
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return FALSE;
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WINPR_ASSERT(ctx);
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if (EVP_CipherUpdate(ctx->ctx, output, &outputLength, input, (int)length) != 1)
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return FALSE;
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return TRUE;
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#endif
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return FALSE;
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}
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void winpr_RC4_Free(WINPR_RC4_CTX* ctx)
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{
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if (!ctx)
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return;
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#if defined(WITH_INTERNAL_RC4)
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winpr_int_rc4_free(ctx->ictx);
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#elif defined(WITH_OPENSSL)
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EVP_CIPHER_CTX_free(ctx->ctx);
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#endif
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free(ctx);
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}
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/**
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* Generic Cipher API
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*/
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#ifdef WITH_OPENSSL
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extern const EVP_MD* winpr_openssl_get_evp_md(WINPR_MD_TYPE md);
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#endif
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#ifdef WITH_MBEDTLS
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extern mbedtls_md_type_t winpr_mbedtls_get_md_type(int md);
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#endif
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#if defined(WITH_OPENSSL)
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static const EVP_CIPHER* winpr_openssl_get_evp_cipher(int cipher)
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{
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const EVP_CIPHER* evp = NULL;
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switch (cipher)
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{
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case WINPR_CIPHER_NULL:
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evp = EVP_enc_null();
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break;
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case WINPR_CIPHER_AES_128_ECB:
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evp = EVP_get_cipherbyname("aes-128-ecb");
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break;
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case WINPR_CIPHER_AES_192_ECB:
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evp = EVP_get_cipherbyname("aes-192-ecb");
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break;
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case WINPR_CIPHER_AES_256_ECB:
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evp = EVP_get_cipherbyname("aes-256-ecb");
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break;
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case WINPR_CIPHER_AES_128_CBC:
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evp = EVP_get_cipherbyname("aes-128-cbc");
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break;
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case WINPR_CIPHER_AES_192_CBC:
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evp = EVP_get_cipherbyname("aes-192-cbc");
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break;
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case WINPR_CIPHER_AES_256_CBC:
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evp = EVP_get_cipherbyname("aes-256-cbc");
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break;
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case WINPR_CIPHER_AES_128_CFB128:
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evp = EVP_get_cipherbyname("aes-128-cfb128");
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break;
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case WINPR_CIPHER_AES_192_CFB128:
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evp = EVP_get_cipherbyname("aes-192-cfb128");
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break;
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case WINPR_CIPHER_AES_256_CFB128:
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evp = EVP_get_cipherbyname("aes-256-cfb128");
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break;
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case WINPR_CIPHER_AES_128_CTR:
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evp = EVP_get_cipherbyname("aes-128-ctr");
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break;
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case WINPR_CIPHER_AES_192_CTR:
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evp = EVP_get_cipherbyname("aes-192-ctr");
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break;
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case WINPR_CIPHER_AES_256_CTR:
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evp = EVP_get_cipherbyname("aes-256-ctr");
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break;
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case WINPR_CIPHER_AES_128_GCM:
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evp = EVP_get_cipherbyname("aes-128-gcm");
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break;
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case WINPR_CIPHER_AES_192_GCM:
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evp = EVP_get_cipherbyname("aes-192-gcm");
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break;
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case WINPR_CIPHER_AES_256_GCM:
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evp = EVP_get_cipherbyname("aes-256-gcm");
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break;
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case WINPR_CIPHER_AES_128_CCM:
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evp = EVP_get_cipherbyname("aes-128-ccm");
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break;
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case WINPR_CIPHER_AES_192_CCM:
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evp = EVP_get_cipherbyname("aes-192-ccm");
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break;
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case WINPR_CIPHER_AES_256_CCM:
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evp = EVP_get_cipherbyname("aes-256-ccm");
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break;
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case WINPR_CIPHER_CAMELLIA_128_ECB:
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evp = EVP_get_cipherbyname("camellia-128-ecb");
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break;
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case WINPR_CIPHER_CAMELLIA_192_ECB:
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evp = EVP_get_cipherbyname("camellia-192-ecb");
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break;
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case WINPR_CIPHER_CAMELLIA_256_ECB:
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evp = EVP_get_cipherbyname("camellia-256-ecb");
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break;
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case WINPR_CIPHER_CAMELLIA_128_CBC:
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evp = EVP_get_cipherbyname("camellia-128-cbc");
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break;
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case WINPR_CIPHER_CAMELLIA_192_CBC:
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evp = EVP_get_cipherbyname("camellia-192-cbc");
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break;
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case WINPR_CIPHER_CAMELLIA_256_CBC:
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evp = EVP_get_cipherbyname("camellia-256-cbc");
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break;
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case WINPR_CIPHER_CAMELLIA_128_CFB128:
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evp = EVP_get_cipherbyname("camellia-128-cfb128");
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break;
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case WINPR_CIPHER_CAMELLIA_192_CFB128:
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evp = EVP_get_cipherbyname("camellia-192-cfb128");
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break;
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case WINPR_CIPHER_CAMELLIA_256_CFB128:
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evp = EVP_get_cipherbyname("camellia-256-cfb128");
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break;
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case WINPR_CIPHER_CAMELLIA_128_CTR:
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evp = EVP_get_cipherbyname("camellia-128-ctr");
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break;
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case WINPR_CIPHER_CAMELLIA_192_CTR:
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evp = EVP_get_cipherbyname("camellia-192-ctr");
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break;
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case WINPR_CIPHER_CAMELLIA_256_CTR:
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evp = EVP_get_cipherbyname("camellia-256-ctr");
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break;
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case WINPR_CIPHER_CAMELLIA_128_GCM:
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evp = EVP_get_cipherbyname("camellia-128-gcm");
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break;
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case WINPR_CIPHER_CAMELLIA_192_GCM:
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evp = EVP_get_cipherbyname("camellia-192-gcm");
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break;
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case WINPR_CIPHER_CAMELLIA_256_GCM:
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evp = EVP_get_cipherbyname("camellia-256-gcm");
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break;
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case WINPR_CIPHER_CAMELLIA_128_CCM:
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evp = EVP_get_cipherbyname("camellia-128-ccm");
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break;
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case WINPR_CIPHER_CAMELLIA_192_CCM:
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evp = EVP_get_cipherbyname("camellia-192-gcm");
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break;
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case WINPR_CIPHER_CAMELLIA_256_CCM:
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evp = EVP_get_cipherbyname("camellia-256-gcm");
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break;
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case WINPR_CIPHER_DES_ECB:
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evp = EVP_get_cipherbyname("des-ecb");
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break;
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case WINPR_CIPHER_DES_CBC:
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evp = EVP_get_cipherbyname("des-cbc");
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break;
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case WINPR_CIPHER_DES_EDE_ECB:
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evp = EVP_get_cipherbyname("des-ede-ecb");
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break;
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case WINPR_CIPHER_DES_EDE_CBC:
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evp = EVP_get_cipherbyname("des-ede-cbc");
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break;
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case WINPR_CIPHER_DES_EDE3_ECB:
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evp = EVP_get_cipherbyname("des-ede3-ecb");
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break;
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case WINPR_CIPHER_DES_EDE3_CBC:
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evp = EVP_get_cipherbyname("des-ede3-cbc");
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break;
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case WINPR_CIPHER_ARC4_128:
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evp = EVP_get_cipherbyname("rc4");
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break;
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case WINPR_CIPHER_BLOWFISH_ECB:
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evp = EVP_get_cipherbyname("blowfish-ecb");
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break;
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case WINPR_CIPHER_BLOWFISH_CBC:
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evp = EVP_get_cipherbyname("blowfish-cbc");
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break;
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case WINPR_CIPHER_BLOWFISH_CFB64:
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evp = EVP_get_cipherbyname("blowfish-cfb64");
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break;
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case WINPR_CIPHER_BLOWFISH_CTR:
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evp = EVP_get_cipherbyname("blowfish-ctr");
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break;
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}
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return evp;
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}
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#elif defined(WITH_MBEDTLS)
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mbedtls_cipher_type_t winpr_mbedtls_get_cipher_type(int cipher)
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{
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mbedtls_cipher_type_t type = MBEDTLS_CIPHER_NONE;
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switch (cipher)
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{
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case WINPR_CIPHER_NONE:
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type = MBEDTLS_CIPHER_NONE;
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break;
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case WINPR_CIPHER_NULL:
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type = MBEDTLS_CIPHER_NULL;
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break;
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case WINPR_CIPHER_AES_128_ECB:
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type = MBEDTLS_CIPHER_AES_128_ECB;
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break;
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case WINPR_CIPHER_AES_192_ECB:
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type = MBEDTLS_CIPHER_AES_192_ECB;
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break;
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case WINPR_CIPHER_AES_256_ECB:
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type = MBEDTLS_CIPHER_AES_256_ECB;
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break;
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case WINPR_CIPHER_AES_128_CBC:
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type = MBEDTLS_CIPHER_AES_128_CBC;
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break;
|
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case WINPR_CIPHER_AES_192_CBC:
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type = MBEDTLS_CIPHER_AES_192_CBC;
|
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break;
|
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|
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case WINPR_CIPHER_AES_256_CBC:
|
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type = MBEDTLS_CIPHER_AES_256_CBC;
|
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break;
|
|
|
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case WINPR_CIPHER_AES_128_CFB128:
|
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type = MBEDTLS_CIPHER_AES_128_CFB128;
|
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break;
|
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|
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case WINPR_CIPHER_AES_192_CFB128:
|
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type = MBEDTLS_CIPHER_AES_192_CFB128;
|
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break;
|
|
|
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case WINPR_CIPHER_AES_256_CFB128:
|
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type = MBEDTLS_CIPHER_AES_256_CFB128;
|
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break;
|
|
|
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case WINPR_CIPHER_AES_128_CTR:
|
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type = MBEDTLS_CIPHER_AES_128_CTR;
|
|
break;
|
|
|
|
case WINPR_CIPHER_AES_192_CTR:
|
|
type = MBEDTLS_CIPHER_AES_192_CTR;
|
|
break;
|
|
|
|
case WINPR_CIPHER_AES_256_CTR:
|
|
type = MBEDTLS_CIPHER_AES_256_CTR;
|
|
break;
|
|
|
|
case WINPR_CIPHER_AES_128_GCM:
|
|
type = MBEDTLS_CIPHER_AES_128_GCM;
|
|
break;
|
|
|
|
case WINPR_CIPHER_AES_192_GCM:
|
|
type = MBEDTLS_CIPHER_AES_192_GCM;
|
|
break;
|
|
|
|
case WINPR_CIPHER_AES_256_GCM:
|
|
type = MBEDTLS_CIPHER_AES_256_GCM;
|
|
break;
|
|
|
|
case WINPR_CIPHER_AES_128_CCM:
|
|
type = MBEDTLS_CIPHER_AES_128_CCM;
|
|
break;
|
|
|
|
case WINPR_CIPHER_AES_192_CCM:
|
|
type = MBEDTLS_CIPHER_AES_192_CCM;
|
|
break;
|
|
|
|
case WINPR_CIPHER_AES_256_CCM:
|
|
type = MBEDTLS_CIPHER_AES_256_CCM;
|
|
break;
|
|
}
|
|
|
|
return type;
|
|
}
|
|
#endif
|
|
|
|
WINPR_CIPHER_CTX* winpr_Cipher_New(int cipher, int op, const void* key, const void* iv)
|
|
{
|
|
WINPR_CIPHER_CTX* ctx = NULL;
|
|
#if defined(WITH_OPENSSL)
|
|
int operation = 0;
|
|
const EVP_CIPHER* evp = NULL;
|
|
EVP_CIPHER_CTX* octx = NULL;
|
|
|
|
if (!(evp = winpr_openssl_get_evp_cipher(cipher)))
|
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return NULL;
|
|
|
|
if (!(octx = EVP_CIPHER_CTX_new()))
|
|
return NULL;
|
|
|
|
operation = (op == WINPR_ENCRYPT) ? 1 : 0;
|
|
|
|
if (EVP_CipherInit_ex(octx, evp, NULL, key, iv, operation) != 1)
|
|
{
|
|
EVP_CIPHER_CTX_free(octx);
|
|
return NULL;
|
|
}
|
|
|
|
EVP_CIPHER_CTX_set_padding(octx, 0);
|
|
ctx = (WINPR_CIPHER_CTX*)octx;
|
|
#elif defined(WITH_MBEDTLS)
|
|
int key_bitlen;
|
|
mbedtls_operation_t operation;
|
|
mbedtls_cipher_context_t* mctx;
|
|
mbedtls_cipher_type_t cipher_type = winpr_mbedtls_get_cipher_type(cipher);
|
|
const mbedtls_cipher_info_t* cipher_info = mbedtls_cipher_info_from_type(cipher_type);
|
|
|
|
if (!cipher_info)
|
|
return NULL;
|
|
|
|
if (!(mctx = (mbedtls_cipher_context_t*)calloc(1, sizeof(mbedtls_cipher_context_t))))
|
|
return NULL;
|
|
|
|
operation = (op == WINPR_ENCRYPT) ? MBEDTLS_ENCRYPT : MBEDTLS_DECRYPT;
|
|
mbedtls_cipher_init(mctx);
|
|
|
|
if (mbedtls_cipher_setup(mctx, cipher_info) != 0)
|
|
{
|
|
free(mctx);
|
|
return NULL;
|
|
}
|
|
|
|
key_bitlen = mbedtls_cipher_get_key_bitlen(mctx);
|
|
|
|
if (mbedtls_cipher_setkey(mctx, key, key_bitlen, operation) != 0)
|
|
{
|
|
mbedtls_cipher_free(mctx);
|
|
free(mctx);
|
|
return NULL;
|
|
}
|
|
|
|
if (mbedtls_cipher_set_padding_mode(mctx, MBEDTLS_PADDING_NONE) != 0)
|
|
{
|
|
mbedtls_cipher_free(mctx);
|
|
free(mctx);
|
|
return NULL;
|
|
}
|
|
|
|
ctx = (WINPR_CIPHER_CTX*)mctx;
|
|
#endif
|
|
return ctx;
|
|
}
|
|
|
|
BOOL winpr_Cipher_SetPadding(WINPR_CIPHER_CTX* ctx, BOOL enabled)
|
|
{
|
|
WINPR_ASSERT(ctx);
|
|
|
|
#if defined(WITH_OPENSSL)
|
|
EVP_CIPHER_CTX_set_padding((EVP_CIPHER_CTX*)ctx, enabled);
|
|
#elif defined(WITH_MBEDTLS)
|
|
mbedtls_cipher_padding_t option = enabled ? MBEDTLS_PADDING_PKCS7 : MBEDTLS_PADDING_NONE;
|
|
if (mbedtls_cipher_set_padding_mode((mbedtls_cipher_context_t*)ctx, option) != 0)
|
|
return FALSE;
|
|
#else
|
|
return FALSE;
|
|
#endif
|
|
return TRUE;
|
|
}
|
|
|
|
BOOL winpr_Cipher_Update(WINPR_CIPHER_CTX* ctx, const void* input, size_t ilen, void* output,
|
|
size_t* olen)
|
|
{
|
|
#if defined(WITH_OPENSSL)
|
|
int outl = (int)*olen;
|
|
|
|
if (ilen > INT_MAX)
|
|
{
|
|
WLog_ERR(TAG, "input length %" PRIuz " > %d, abort", ilen, INT_MAX);
|
|
return FALSE;
|
|
}
|
|
|
|
WINPR_ASSERT(ctx);
|
|
if (EVP_CipherUpdate((EVP_CIPHER_CTX*)ctx, output, &outl, input, (int)ilen) == 1)
|
|
{
|
|
*olen = (size_t)outl;
|
|
return TRUE;
|
|
}
|
|
|
|
#elif defined(WITH_MBEDTLS)
|
|
|
|
if (mbedtls_cipher_update((mbedtls_cipher_context_t*)ctx, input, ilen, output, olen) == 0)
|
|
return TRUE;
|
|
|
|
#endif
|
|
|
|
WLog_ERR(TAG, "Failed to update the data");
|
|
return FALSE;
|
|
}
|
|
|
|
BOOL winpr_Cipher_Final(WINPR_CIPHER_CTX* ctx, void* output, size_t* olen)
|
|
{
|
|
#if defined(WITH_OPENSSL)
|
|
int outl = (int)*olen;
|
|
|
|
if (EVP_CipherFinal_ex((EVP_CIPHER_CTX*)ctx, output, &outl) == 1)
|
|
{
|
|
*olen = (size_t)outl;
|
|
return TRUE;
|
|
}
|
|
|
|
#elif defined(WITH_MBEDTLS)
|
|
|
|
if (mbedtls_cipher_finish((mbedtls_cipher_context_t*)ctx, output, olen) == 0)
|
|
return TRUE;
|
|
|
|
#endif
|
|
return FALSE;
|
|
}
|
|
|
|
void winpr_Cipher_Free(WINPR_CIPHER_CTX* ctx)
|
|
{
|
|
if (!ctx)
|
|
return;
|
|
|
|
#if defined(WITH_OPENSSL)
|
|
EVP_CIPHER_CTX_free((EVP_CIPHER_CTX*)ctx);
|
|
#elif defined(WITH_MBEDTLS)
|
|
mbedtls_cipher_free((mbedtls_cipher_context_t*)ctx);
|
|
free(ctx);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Key Generation
|
|
*/
|
|
|
|
int winpr_Cipher_BytesToKey(int cipher, WINPR_MD_TYPE md, const void* salt, const void* data,
|
|
size_t datal, size_t count, void* key, void* iv)
|
|
{
|
|
/**
|
|
* Key and IV generation compatible with OpenSSL EVP_BytesToKey():
|
|
* https://www.openssl.org/docs/manmaster/crypto/EVP_BytesToKey.html
|
|
*/
|
|
#if defined(WITH_OPENSSL)
|
|
const EVP_MD* evp_md = NULL;
|
|
const EVP_CIPHER* evp_cipher = NULL;
|
|
evp_md = winpr_openssl_get_evp_md((WINPR_MD_TYPE)md);
|
|
evp_cipher = winpr_openssl_get_evp_cipher(cipher);
|
|
return EVP_BytesToKey(evp_cipher, evp_md, salt, data, datal, count, key, iv);
|
|
#elif defined(WITH_MBEDTLS)
|
|
int rv = 0;
|
|
BYTE md_buf[64];
|
|
int niv, nkey, addmd = 0;
|
|
unsigned int mds = 0;
|
|
mbedtls_md_context_t ctx;
|
|
const mbedtls_md_info_t* md_info;
|
|
mbedtls_cipher_type_t cipher_type;
|
|
const mbedtls_cipher_info_t* cipher_info;
|
|
mbedtls_md_type_t md_type = winpr_mbedtls_get_md_type(md);
|
|
md_info = mbedtls_md_info_from_type(md_type);
|
|
cipher_type = winpr_mbedtls_get_cipher_type(cipher);
|
|
cipher_info = mbedtls_cipher_info_from_type(cipher_type);
|
|
nkey = mbedtls_cipher_info_get_key_bitlen(cipher_info) / 8;
|
|
niv = mbedtls_cipher_info_get_iv_size(cipher_info);
|
|
|
|
if ((nkey > 64) || (niv > 64))
|
|
return 0;
|
|
|
|
if (!data)
|
|
return nkey;
|
|
|
|
mbedtls_md_init(&ctx);
|
|
|
|
if (mbedtls_md_setup(&ctx, md_info, 0) != 0)
|
|
goto err;
|
|
|
|
while (1)
|
|
{
|
|
if (mbedtls_md_starts(&ctx) != 0)
|
|
goto err;
|
|
|
|
if (addmd++)
|
|
{
|
|
if (mbedtls_md_update(&ctx, md_buf, mds) != 0)
|
|
goto err;
|
|
}
|
|
|
|
if (mbedtls_md_update(&ctx, data, datal) != 0)
|
|
goto err;
|
|
|
|
if (salt)
|
|
{
|
|
if (mbedtls_md_update(&ctx, salt, 8) != 0)
|
|
goto err;
|
|
}
|
|
|
|
if (mbedtls_md_finish(&ctx, md_buf) != 0)
|
|
goto err;
|
|
|
|
mds = mbedtls_md_get_size(md_info);
|
|
|
|
for (unsigned int i = 1; i < (unsigned int)count; i++)
|
|
{
|
|
if (mbedtls_md_starts(&ctx) != 0)
|
|
goto err;
|
|
|
|
if (mbedtls_md_update(&ctx, md_buf, mds) != 0)
|
|
goto err;
|
|
|
|
if (mbedtls_md_finish(&ctx, md_buf) != 0)
|
|
goto err;
|
|
}
|
|
|
|
i = 0;
|
|
|
|
if (nkey)
|
|
{
|
|
while (1)
|
|
{
|
|
if (nkey == 0)
|
|
break;
|
|
|
|
if (i == mds)
|
|
break;
|
|
|
|
if (key)
|
|
*(BYTE*)(key++) = md_buf[i];
|
|
|
|
nkey--;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
if (niv && (i != mds))
|
|
{
|
|
while (1)
|
|
{
|
|
if (niv == 0)
|
|
break;
|
|
|
|
if (i == mds)
|
|
break;
|
|
|
|
if (iv)
|
|
*(BYTE*)(iv++) = md_buf[i];
|
|
|
|
niv--;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
if ((nkey == 0) && (niv == 0))
|
|
break;
|
|
}
|
|
|
|
rv = mbedtls_cipher_info_get_key_bitlen(cipher_info) / 8;
|
|
err:
|
|
mbedtls_md_free(&ctx);
|
|
SecureZeroMemory(md_buf, 64);
|
|
return rv;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|