mirror of
https://github.com/Wind4/vlmcsd.git
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270 lines
6.1 KiB
C
270 lines
6.1 KiB
C
#ifndef CONFIG
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#define CONFIG "config.h"
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#endif // CONFIG
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#include CONFIG
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#if defined(_CRYPTO_OPENSSL)
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#include "crypto.h"
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#include "crypto_openssl.h" // Required for Eclipse only
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#include <stdint.h>
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#include "endian.h"
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#ifndef _OPENSSL_NO_HMAC
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int Sha256HmacInit_OpenSSL(HMAC_CTX *c, const void *k, int l)
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{
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HMAC_CTX_init(c);
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#if OPENSSL_VERSION_NUMBER >= 0x10000000L
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int result =
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#else
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int result = TRUE;
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#endif
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HMAC_Init_ex(c, k, l, EVP_sha256(), NULL);
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return result;
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}
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int Sha256HmacFinish_OpenSSL(HMAC_CTX *c, unsigned char *h, unsigned int *l)
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{
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#if OPENSSL_VERSION_NUMBER >= 0x10000000L
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int result =
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#else
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int result = !0;
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#endif
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HMAC_Final(c, h, l);
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HMAC_CTX_cleanup(c);
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return result;
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}
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int_fast8_t Sha256Hmac(BYTE* key, BYTE* restrict data, DWORD len, BYTE* restrict hmac)
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{
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HMAC_CTX Ctx;
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# if OPENSSL_VERSION_NUMBER >= 0x10000000L
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return
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Sha256HmacInit_OpenSSL(&Ctx, key, 16) &&
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HMAC_Update(&Ctx, data, len) &&
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Sha256HmacFinish_OpenSSL(&Ctx, hmac, NULL);
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# else // OpenSSL 0.9.x
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Sha256HmacInit_OpenSSL(&Ctx, key, 16);
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HMAC_Update(&Ctx, data, len);
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Sha256HmacFinish_OpenSSL(&Ctx, hmac, NULL);
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return TRUE;
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# endif
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}
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#else // _OPENSSL_NO_HMAC (some routers have OpenSSL without support for HMAC)
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int _Sha256HmacInit(Sha256HmacCtx *Ctx, BYTE *key, size_t klen)
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{
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BYTE IPad[64];
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unsigned int i;
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memset(IPad, 0x36, sizeof(IPad));
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memset(Ctx->OPad, 0x5C, sizeof(Ctx->OPad));
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if ( klen > 64 )
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{
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BYTE *temp = (BYTE*)alloca(32);
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SHA256(key, klen, temp);
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klen = 32;
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key = temp;
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}
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for (i = 0; i < klen; i++)
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{
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IPad[ i ] ^= key[ i ];
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Ctx->OPad[ i ] ^= key[ i ];
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}
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SHA256_Init(&Ctx->ShaCtx);
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return SHA256_Update(&Ctx->ShaCtx, IPad, sizeof(IPad));
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}
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int _Sha256HmacUpdate(Sha256HmacCtx *Ctx, BYTE *data, size_t len)
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{
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int rc = SHA256_Update(&Ctx->ShaCtx, data, len);
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return rc;
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}
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int _Sha256HmacFinish(Sha256HmacCtx *Ctx, BYTE *hmac, void* dummy)
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{
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BYTE temp[32];
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SHA256_Final(temp, &Ctx->ShaCtx);
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SHA256_Init(&Ctx->ShaCtx);
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SHA256_Update(&Ctx->ShaCtx, Ctx->OPad, sizeof(Ctx->OPad));
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SHA256_Update(&Ctx->ShaCtx, temp, sizeof(temp));
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return SHA256_Final(hmac, &Ctx->ShaCtx);
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}
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int_fast8_t Sha256Hmac(BYTE* key, BYTE* restrict data, DWORD len, BYTE* restrict hmac)
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{
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Sha256HmacCtx Ctx;
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_Sha256HmacInit(&Ctx, key, 16);
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_Sha256HmacUpdate(&Ctx, data, len);
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_Sha256HmacFinish(&Ctx, hmac, NULL);
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return TRUE;
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}
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#endif
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#if defined(_USE_AES_FROM_OPENSSL)
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void TransformOpenSslEncryptKey(AES_KEY *k, const AesCtx *const Ctx)
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{
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uint32_t *rk_OpenSSL = k->rd_key, *rk_vlmcsd = (uint32_t*)Ctx->Key;
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k->rounds = Ctx->rounds;
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for (; rk_OpenSSL < k->rd_key + ((k->rounds + 1) << 2); rk_OpenSSL++, rk_vlmcsd++)
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{
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#ifdef _OPENSSL_SOFTWARE
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*rk_OpenSSL = BE32(*rk_vlmcsd);
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#else
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*rk_OpenSSL = LE32(*rk_vlmcsd);
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#endif
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}
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}
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void TransformOpenSslDecryptKey(AES_KEY *k, const AesCtx *const Ctx)
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{
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uint_fast8_t i;
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#ifdef _DEBUG_OPENSSL
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AES_set_decrypt_key((BYTE*)Ctx->Key, 128, k);
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errorout("Correct V5 round key:");
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for (i = 0; i < (Ctx->rounds + 1) << 4; i++)
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{
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if (!(i % 16)) errorout("\n");
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if (!(i % 4)) errorout(" ");
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errorout("%02X", ((BYTE*)(k->rd_key))[i]);
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}
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errorout("\n");
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#endif
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k->rounds = Ctx->rounds;
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/* invert the order of the round keys blockwise (1 Block = AES_BLOCK_SIZE = 16): */
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for (i = 0; i < (Ctx->rounds + 1) << 2; i++)
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{
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#ifdef _OPENSSL_SOFTWARE
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k->rd_key[((Ctx->rounds-(i >> 2)) << 2) + (i & 3)] = BE32(Ctx->Key[i]);
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#else
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k->rd_key[((Ctx->rounds-(i >> 2)) << 2) + (i & 3)] = LE32(Ctx->Key[i]);
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#endif
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}
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/* apply the inverse MixColumn transform to all round keys but the first and the last: */
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uint32_t *rk = k->rd_key + 4;
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for (i = 0; i < (Ctx->rounds - 1); i++)
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{
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MixColumnsR((BYTE*)(rk + (i << 2)));
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}
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#ifdef _DEBUG_OPENSSL
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errorout("Real round key:");
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for (i = 0; i < (Ctx->rounds + 1) << 4; i++)
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{
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if (!(i % 16)) errorout("\n");
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if (!(i % 4)) errorout(" ");
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errorout("%02X", ((BYTE*)(k->rd_key))[i]);
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}
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errorout("\n");
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#endif
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}
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static BYTE NullIV[AES_BLOCK_SIZE + 8]; // OpenSSL may overwrite bytes behind IV
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void AesEncryptCbc(const AesCtx *const Ctx, BYTE *iv, BYTE *data, size_t *len)
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{
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AES_KEY k;
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// OpenSSL overwrites IV plus 4 bytes
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BYTE localIV[24]; // 4 spare bytes for safety
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if (iv) memcpy(localIV, iv, AES_BLOCK_SIZE);
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// OpenSSL Low-Level APIs do not pad. Could use EVP API instead but needs more code to access the expanded key
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uint_fast8_t pad = (~*len & (AES_BLOCK_SIZE - 1)) + 1;
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#if defined(__GNUC__) && (__GNUC__ == 4 && __GNUC_MINOR__ == 8) // gcc 4.8 memset bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56977
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size_t i;
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for (i = 0; i < pad; i++) data[*len + i] = pad;
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#else
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memset(data + *len, pad, pad);
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#endif
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*len += pad;
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memset(NullIV, 0, sizeof(NullIV));
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TransformOpenSslEncryptKey(&k, Ctx);
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AES_cbc_encrypt(data, data, *len, &k, iv ? localIV : NullIV, AES_ENCRYPT);
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}
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void AesDecryptBlock(const AesCtx *const Ctx, BYTE *block)
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{
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AES_KEY k;
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TransformOpenSslDecryptKey(&k, Ctx);
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AES_decrypt(block, block, &k);
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}
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#if defined(_CRYPTO_OPENSSL) && defined(_USE_AES_FROM_OPENSSL) && !defined(_OPENSSL_SOFTWARE)
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void AesEncryptBlock(const AesCtx *const Ctx, BYTE *block)
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{
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AES_KEY k;
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TransformOpenSslEncryptKey(&k, Ctx);
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AES_encrypt(block, block, &k);
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}
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#endif
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void AesDecryptCbc(const AesCtx *const Ctx, BYTE *iv, BYTE *data, size_t len)
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{
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AES_KEY k;
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memset(NullIV, 0, sizeof(NullIV));
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TransformOpenSslDecryptKey(&k, Ctx);
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AES_cbc_encrypt(data, data, len, &k, iv ? iv : NullIV, AES_DECRYPT);
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}
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#ifndef _OPENSSL_SOFTWARE
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void AesCmacV4(BYTE *Message, size_t MessageSize, BYTE *HashOut)
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{
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size_t i;
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BYTE hash[AES_BLOCK_BYTES];
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AesCtx Ctx;
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AES_KEY k;
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AesInitKey(&Ctx, AesKeyV4, FALSE, V4_KEY_BYTES);
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TransformOpenSslEncryptKey(&k, &Ctx);
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memset(hash, 0, sizeof(hash));
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memset(Message + MessageSize, 0, AES_BLOCK_BYTES);
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Message[MessageSize] = 0x80;
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for (i = 0; i <= MessageSize; i += AES_BLOCK_BYTES)
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{
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XorBlock(Message + i, hash);
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AES_encrypt(hash, hash, &k);
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}
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memcpy(HashOut, hash, AES_BLOCK_BYTES);
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}
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#endif // !_OPENSSL_SOFTWARE
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#endif // defined(_USE_AES_FROM_OPENSSL)
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#endif // _CRYPTO_OPENSSL
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