1 #define _WIN32_WINNT 0x0400
8 void fatalbox(char *fmt
, ...);
10 static HCRYPTKEY
create_des_key(unsigned char *key
);
13 HCRYPTPROV hCryptProv
;
14 HCRYPTKEY hDESKey
[2][3] = { {0, 0, 0}, {0, 0, 0} }; /* global for now */
17 /* use Microsoft Enhanced Cryptographic Service Provider */
18 #define CSP MS_ENHANCED_PROV
21 static BYTE PrivateKeyWithExponentOfOne
[] = {
22 0x07, 0x02, 0x00, 0x00, 0x00, 0xA4, 0x00, 0x00,
23 0x52, 0x53, 0x41, 0x32, 0x00, 0x02, 0x00, 0x00,
24 0x01, 0x00, 0x00, 0x00, 0xAB, 0xEF, 0xFA, 0xC6,
25 0x7D, 0xE8, 0xDE, 0xFB, 0x68, 0x38, 0x09, 0x92,
26 0xD9, 0x42, 0x7E, 0x6B, 0x89, 0x9E, 0x21, 0xD7,
27 0x52, 0x1C, 0x99, 0x3C, 0x17, 0x48, 0x4E, 0x3A,
28 0x44, 0x02, 0xF2, 0xFA, 0x74, 0x57, 0xDA, 0xE4,
29 0xD3, 0xC0, 0x35, 0x67, 0xFA, 0x6E, 0xDF, 0x78,
30 0x4C, 0x75, 0x35, 0x1C, 0xA0, 0x74, 0x49, 0xE3,
31 0x20, 0x13, 0x71, 0x35, 0x65, 0xDF, 0x12, 0x20,
32 0xF5, 0xF5, 0xF5, 0xC1, 0xED, 0x5C, 0x91, 0x36,
33 0x75, 0xB0, 0xA9, 0x9C, 0x04, 0xDB, 0x0C, 0x8C,
34 0xBF, 0x99, 0x75, 0x13, 0x7E, 0x87, 0x80, 0x4B,
35 0x71, 0x94, 0xB8, 0x00, 0xA0, 0x7D, 0xB7, 0x53,
36 0xDD, 0x20, 0x63, 0xEE, 0xF7, 0x83, 0x41, 0xFE,
37 0x16, 0xA7, 0x6E, 0xDF, 0x21, 0x7D, 0x76, 0xC0,
38 0x85, 0xD5, 0x65, 0x7F, 0x00, 0x23, 0x57, 0x45,
39 0x52, 0x02, 0x9D, 0xEA, 0x69, 0xAC, 0x1F, 0xFD,
40 0x3F, 0x8C, 0x4A, 0xD0,
42 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
43 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
44 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
45 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
47 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
49 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
52 0x64, 0xD5, 0xAA, 0xB1,
53 0xA6, 0x03, 0x18, 0x92, 0x03, 0xAA, 0x31, 0x2E,
54 0x48, 0x4B, 0x65, 0x20, 0x99, 0xCD, 0xC6, 0x0C,
55 0x15, 0x0C, 0xBF, 0x3E, 0xFF, 0x78, 0x95, 0x67,
56 0xB1, 0x74, 0x5B, 0x60,
58 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
59 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
60 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
62 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
64 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
65 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
70 /* ---------------------------------------------------------*
72 * ---------------------------------------------------------*/
77 if (CryptAcquireContext(&hCryptProv
, "Putty", CSP
, PROV_RSA_FULL
,
78 CRYPT_NEWKEYSET
) == 0) {
79 if (GetLastError() == NTE_EXISTS
) {
80 if (CryptAcquireContext(&hCryptProv
, "Putty", CSP
,
81 PROV_RSA_FULL
, 0) == 0) {
82 return FALSE
; /* failed to acquire context - probably
83 * don't have high encryption installed! */
86 return FALSE
; /* failed to acquire context - probably
87 * don't have high encryption installed! */
96 for (i
= 0; i
< 2; i
++) {
97 for (j
= 0; j
< 3; j
++) {
99 CryptDestroyKey(hDESKey
[i
][j
]);
104 CryptReleaseContext(hCryptProv
, 0);
109 /* ---------------------------------------------------------*
110 * Random number functions *
111 * ---------------------------------------------------------*/
113 int random_byte(void)
116 if (!CryptGenRandom(hCryptProv
, 1, &b
))
117 fatalbox("random number generator failure!");
121 void random_add_noise(void *noise
, int length
)
125 void random_init(void)
129 void random_get_savedata(void **data
, int *len
)
133 void noise_get_heavy(void (*func
) (void *, int))
137 void noise_get_light(void (*func
) (void *, int))
141 void noise_ultralight(DWORD data
)
145 void random_save_seed(void)
151 /* ---------------------------------------------------------*
152 * MD5 hash functions *
153 * ---------------------------------------------------------*/
156 void MD5Init(struct MD5Context
*ctx
)
158 if (!CryptCreateHash(hCryptProv
, CALG_MD5
, 0, 0, &ctx
->hHash
))
159 fatalbox("Error during CryptBeginHash!\n");
163 void MD5Update(struct MD5Context
*ctx
,
164 unsigned char const *buf
, unsigned len
)
166 if (CryptHashData(ctx
->hHash
, buf
, len
, 0) == 0)
167 fatalbox("Error during CryptHashSessionKey!\n");
171 void MD5Final(unsigned char digest
[16], struct MD5Context
*ctx
)
174 if (CryptGetHashParam(ctx
->hHash
, HP_HASHVAL
, digest
, &cb
, 0) == 0)
175 fatalbox("Error during CryptGetHashParam!\n");
177 CryptDestroyHash(ctx
->hHash
);
182 /* ---------------------------------------------------------*
183 * RSA public key functions *
184 * ---------------------------------------------------------*/
186 int makekey(unsigned char *data
, struct RSAKey
*result
,
187 unsigned char **keystr
)
190 unsigned char *p
= data
;
194 /* get size (bits) of modulus */
196 for (i
= 0; i
< 4; i
++)
197 result
->bits
= (result
->bits
<< 8) + *p
++;
199 /* get size (bits) of public exponent */
201 for (i
= 0; i
< 2; i
++)
203 b
= (w
+ 7) / 8; /* bits -> bytes */
205 /* convert exponent to DWORD */
206 result
->exponent
= 0;
207 for (i
= 0; i
< b
; i
++)
208 result
->exponent
= (result
->exponent
<< 8) + *p
++;
210 /* get size (bits) of modulus */
212 for (i
= 0; i
< 2; i
++)
214 result
->bytes
= b
= (w
+ 7) / 8; /* bits -> bytes */
216 /* allocate buffer for modulus & copy it */
217 result
->modulus
= malloc(b
);
218 memcpy(result
->modulus
, p
, b
);
220 /* update callers pointer */
222 *keystr
= p
; /* point at key string, second time */
224 return (p
- data
) + b
;
228 void rsaencrypt(unsigned char *data
, int length
, struct RSAKey
*rsakey
)
232 unsigned char *pKeybuf
, *pKeyin
;
234 PUBLICKEYSTRUC
*pBlob
;
240 /* allocate buffer for public key blob */
241 if ((pBlob
= malloc(sizeof(PUBLICKEYSTRUC
) + sizeof(RSAPUBKEY
) +
242 rsakey
->bytes
)) == NULL
)
243 fatalbox("Out of memory");
245 /* allocate buffer for message encryption block */
246 bufsize
= (length
+ rsakey
->bytes
) << 1;
247 if ((buf
= malloc(bufsize
)) == NULL
)
248 fatalbox("Out of memory");
250 /* construct public key blob from host public key */
251 pKeybuf
= ((unsigned char *) pBlob
) + sizeof(PUBLICKEYSTRUC
) +
253 pKeyin
= ((unsigned char *) rsakey
->modulus
);
254 /* change big endian to little endian */
255 for (i
= 0; i
< rsakey
->bytes
; i
++)
256 pKeybuf
[i
] = pKeyin
[rsakey
->bytes
- i
- 1];
257 pBlob
->bType
= PUBLICKEYBLOB
;
258 pBlob
->bVersion
= 0x02;
260 pBlob
->aiKeyAlg
= CALG_RSA_KEYX
;
262 (RSAPUBKEY
*) (((unsigned char *) pBlob
) + sizeof(PUBLICKEYSTRUC
));
263 pRPK
->magic
= 0x31415352; /* "RSA1" */
264 pRPK
->bitlen
= rsakey
->bits
;
265 pRPK
->pubexp
= rsakey
->exponent
;
267 /* import public key blob into key container */
268 if (CryptImportKey(hCryptProv
, (void *) pBlob
,
269 sizeof(PUBLICKEYSTRUC
) + sizeof(RSAPUBKEY
) +
270 rsakey
->bytes
, 0, 0, &hRsaKey
) == 0)
271 fatalbox("Error importing RSA key!");
273 /* copy message into buffer */
274 memcpy(buf
, data
, length
);
277 /* using host public key, encrypt the message */
278 if (CryptEncrypt(hRsaKey
, 0, TRUE
, 0, buf
, &dlen
, bufsize
) == 0)
279 fatalbox("Error encrypting using RSA key!");
282 * For some strange reason, Microsoft CryptEncrypt using public
283 * key, returns the cyphertext in backwards (little endian)
284 * order, so reverse it!
286 for (i
= 0; i
< (int) dlen
; i
++)
287 data
[i
] = buf
[dlen
- i
- 1]; /* make it big endian */
289 CryptDestroyKey(hRsaKey
);
296 int rsastr_len(struct RSAKey
*key
)
298 return 2 * (sizeof(DWORD
) + key
->bytes
) + 10;
302 void rsastr_fmt(char *str
, struct RSAKey
*key
)
307 sprintf(str
+ len
, "%04x", key
->exponent
);
308 len
+= strlen(str
+ len
);
311 for (i
= 1; i
< key
->bytes
; i
++) {
312 sprintf(str
+ len
, "%02x", key
->modulus
[i
]);
313 len
+= strlen(str
+ len
);
320 /* ---------------------------------------------------------*
321 * DES encryption / decryption functions *
322 * ---------------------------------------------------------*/
325 void des3_sesskey(unsigned char *key
)
328 for (i
= 0; i
< 2; i
++) {
329 for (j
= 0; j
< 3; j
++) {
330 hDESKey
[i
][j
] = create_des_key(key
+ (j
* 8));
336 void des3_encrypt_blk(unsigned char *blk
, int len
)
342 if (CryptEncrypt(hDESKey
[0][0], 0, FALSE
, 0, blk
, &dlen
, len
+ 8) == 0)
343 fatalbox("Error encrypting block!\n");
344 if (CryptDecrypt(hDESKey
[0][1], 0, FALSE
, 0, blk
, &dlen
) == 0)
345 fatalbox("Error encrypting block!\n");
346 if (CryptEncrypt(hDESKey
[0][2], 0, FALSE
, 0, blk
, &dlen
, len
+ 8) == 0)
347 fatalbox("Error encrypting block!\n");
351 void des3_decrypt_blk(unsigned char *blk
, int len
)
356 if (CryptDecrypt(hDESKey
[1][2], 0, FALSE
, 0, blk
, &dlen
) == 0)
357 fatalbox("Error decrypting block!\n");
358 if (CryptEncrypt(hDESKey
[1][1], 0, FALSE
, 0, blk
, &dlen
, len
+ 8) == 0)
359 fatalbox("Error decrypting block!\n");
360 if (CryptDecrypt(hDESKey
[1][0], 0, FALSE
, 0, blk
, &dlen
) == 0)
361 fatalbox("Error decrypting block!\n");
365 struct ssh_cipher ssh_3des
= {
372 void des_sesskey(unsigned char *key
)
375 for (i
= 0; i
< 2; i
++) {
376 hDESKey
[i
][0] = create_des_key(key
);
381 void des_encrypt_blk(unsigned char *blk
, int len
)
385 if (CryptEncrypt(hDESKey
[0][0], 0, FALSE
, 0, blk
, &dlen
, len
+ 8) == 0)
386 fatalbox("Error encrypting block!\n");
390 void des_decrypt_blk(unsigned char *blk
, int len
)
394 if (CryptDecrypt(hDESKey
[1][0], 0, FALSE
, 0, blk
, &dlen
) == 0)
395 fatalbox("Error decrypting block!\n");
398 struct ssh_cipher ssh_des
= {
405 static HCRYPTKEY
create_des_key(unsigned char *key
)
408 HCRYPTKEY hSessionKey
, hPrivateKey
;
411 char buf
[sizeof(BLOBHEADER
) + sizeof(ALG_ID
) + 256];
414 * Need special private key to encrypt session key so we can
415 * import session key, since only encrypted session keys can be
418 if (CryptImportKey(hCryptProv
, PrivateKeyWithExponentOfOne
,
419 sizeof(PrivateKeyWithExponentOfOne
),
420 0, 0, &hPrivateKey
) == 0)
423 /* now encrypt session key using special private key */
424 memcpy(buf
+ sizeof(BLOBHEADER
) + sizeof(ALG_ID
), key
, 8);
425 if (CryptEncrypt(hPrivateKey
, 0, TRUE
, 0,
426 buf
+ sizeof(BLOBHEADER
) + sizeof(ALG_ID
),
430 /* build session key blob */
431 pbh
= (BLOBHEADER
*) buf
;
432 pbh
->bType
= SIMPLEBLOB
;
433 pbh
->bVersion
= 0x02;
435 pbh
->aiKeyAlg
= CALG_DES
;
436 *((ALG_ID
*) (buf
+ sizeof(BLOBHEADER
))) = CALG_RSA_KEYX
;
438 /* import session key into key container */
439 if (CryptImportKey(hCryptProv
, buf
,
440 dlen
+ sizeof(BLOBHEADER
) + sizeof(ALG_ID
),
441 hPrivateKey
, 0, &hSessionKey
) == 0)
445 CryptDestroyKey(hPrivateKey
);