2 * Copyright (C) 2011 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file gcrypt.c Libgrcypt-based encryption/decryption routines. */
17 #include "crypt_backend.h"
20 //#define GCRYPT_DEBUG 1
23 static void dump_buffer(const char *msg
, unsigned char *buf
, int len
)
27 fprintf(stderr
, "%s (%u bytes): ", msg
, len
);
28 for (i
= 0; i
< len
; i
++)
29 fprintf(stderr
, "%02x ", buf
[i
]);
30 fprintf(stderr
, "\n");
33 /** Empty. Define GCRYPT_DEBUG to dump buffers. */
34 #define dump_buffer(a, b, c)
37 void hash_function(const char *data
, unsigned long len
, unsigned char *hash
)
43 gret
= gcry_md_open(&handle
, GCRY_MD_SHA1
, 0);
45 gcry_md_write(handle
, data
, (size_t)len
);
46 gcry_md_final(handle
);
47 md
= gcry_md_read(handle
, GCRY_MD_SHA1
);
49 memcpy(hash
, md
, HASH_SIZE
);
50 gcry_md_close(handle
);
53 void get_random_bytes_or_die(unsigned char *buf
, int num
)
55 gcry_randomize(buf
, (size_t)num
, GCRY_STRONG_RANDOM
);
59 * This is called at the beginning of every program that uses libgcrypt. We
60 * don't have to initialize any random seed here, but the call to gcry_control
61 * is necessary to avoid warnings of the form "missing initialization - please
62 * fix the application".
64 void init_random_seed_or_die(void)
66 gcry_control(GCRYCTL_INITIALIZATION_FINISHED
, 0);
69 /** S-expression for the public part of an RSA key. */
70 #define RSA_PUBKEY_SEXP "(public-key (rsa (n %m) (e %m)))"
71 /** S-expression for a private RSA key. */
72 #define RSA_PRIVKEY_SEXP "(private-key (rsa (n %m) (e %m) (d %m) (p %m) (q %m) (u %m)))"
74 /* rfc 3447, appendix B.2 */
75 static void mgf1(unsigned char *seed
, size_t seed_len
, unsigned result_len
,
76 unsigned char *result
)
82 unsigned char octet_string
[4], *rp
= result
, *end
= rp
+ result_len
;
84 assert(result_len
/ HASH_SIZE
< 1ULL << 31);
85 gret
= gcry_md_open(&handle
, GCRY_MD_SHA1
, 0);
87 for (n
= 0; rp
< end
; n
++) {
88 gcry_md_write(handle
, seed
, seed_len
);
89 octet_string
[0] = (unsigned char)((n
>> 24) & 255);
90 octet_string
[1] = (unsigned char)((n
>> 16) & 255);
91 octet_string
[2] = (unsigned char)((n
>> 8)) & 255;
92 octet_string
[3] = (unsigned char)(n
& 255);
93 gcry_md_write(handle
, octet_string
, 4);
94 gcry_md_final(handle
);
95 md
= gcry_md_read(handle
, GCRY_MD_SHA1
);
96 memcpy(rp
, md
, PARA_MIN(HASH_SIZE
, (int)(end
- rp
)));
98 gcry_md_reset(handle
);
100 gcry_md_close(handle
);
103 /** The sha1 hash of an empty file. */
104 static const unsigned char empty_hash
[HASH_SIZE
] =
105 "\xda" "\x39" "\xa3" "\xee" "\x5e"
106 "\x6b" "\x4b" "\x0d" "\x32" "\x55"
107 "\xbf" "\xef" "\x95" "\x60" "\x18"
108 "\x90" "\xaf" "\xd8" "\x07" "\x09";
110 /* rfc3447, section 7.1.1 */
111 static void pad_oaep(unsigned char *in
, size_t in_len
, unsigned char *out
,
114 size_t ps_len
= out_len
- in_len
- 2 * HASH_SIZE
- 2;
115 size_t n
, mask_len
= out_len
- HASH_SIZE
- 1;
116 unsigned char *seed
= out
+ 1, *db
= seed
+ HASH_SIZE
,
117 *ps
= db
+ HASH_SIZE
, *one
= ps
+ ps_len
;
118 unsigned char *db_mask
, seed_mask
[HASH_SIZE
];
120 assert(in_len
<= out_len
- 2 - 2 * HASH_SIZE
);
121 assert(out_len
> 2 * HASH_SIZE
+ 2);
122 PARA_DEBUG_LOG("padding %zu byte input -> %zu byte output\n",
124 dump_buffer("unpadded buffer", in
, in_len
);
127 get_random_bytes_or_die(seed
, HASH_SIZE
);
128 memcpy(db
, empty_hash
, HASH_SIZE
);
129 memset(ps
, 0, ps_len
);
131 memcpy(one
+ 1, in
, in_len
);
132 db_mask
= para_malloc(mask_len
);
133 mgf1(seed
, HASH_SIZE
, mask_len
, db_mask
);
134 for (n
= 0; n
< mask_len
; n
++)
136 mgf1(db
, mask_len
, HASH_SIZE
, seed_mask
);
137 for (n
= 0; n
< HASH_SIZE
; n
++)
138 seed
[n
] ^= seed_mask
[n
];
140 dump_buffer("padded buffer", out
, out_len
);
143 /* rfc 3447, section 7.1.2 */
144 static int unpad_oaep(unsigned char *in
, size_t in_len
, unsigned char *out
,
147 unsigned char *masked_seed
= in
+ 1;
148 unsigned char *db
= in
+ 1 + HASH_SIZE
;
149 unsigned char seed
[HASH_SIZE
], seed_mask
[HASH_SIZE
];
150 unsigned char *db_mask
, *p
;
151 size_t n
, mask_len
= in_len
- HASH_SIZE
- 1;
153 mgf1(db
, mask_len
, HASH_SIZE
, seed_mask
);
154 for (n
= 0; n
< HASH_SIZE
; n
++)
155 seed
[n
] = masked_seed
[n
] ^ seed_mask
[n
];
156 db_mask
= para_malloc(mask_len
);
157 mgf1(seed
, HASH_SIZE
, mask_len
, db_mask
);
158 for (n
= 0; n
< mask_len
; n
++)
161 if (memcmp(db
, empty_hash
, HASH_SIZE
))
163 for (p
= db
+ HASH_SIZE
; p
< in
+ in_len
- 1; p
++)
166 if (p
>= in
+ in_len
- 1)
169 *out_len
= in
+ in_len
- p
;
170 memcpy(out
, p
, *out_len
);
174 struct asymmetric_key
{
179 static const char *gcrypt_strerror(gcry_error_t gret
)
181 return gcry_strerror(gcry_err_code(gret
));
184 static int decode_key(const char *key_file
, const char *header_str
,
185 const char *footer_str
, unsigned char **result
)
189 size_t map_size
, key_size
, blob_size
;
190 unsigned char *blob
= NULL
;
191 char *begin
, *footer
, *key
;
193 ret
= mmap_full_file(key_file
, O_RDONLY
, &map
, &map_size
, NULL
);
197 if (strncmp(map
, header_str
, strlen(header_str
)))
199 footer
= strstr(map
, footer_str
);
203 begin
= map
+ strlen(header_str
);
204 /* skip whitespace at the beginning */
205 for (; begin
< footer
; begin
++) {
206 if (para_isspace(*begin
))
214 key_size
= footer
- begin
;
215 key
= para_malloc(key_size
+ 1);
216 for (i
= 0, j
= 0; begin
+ i
< footer
; i
++) {
217 if (para_isspace(begin
[i
]))
222 //PARA_CRIT_LOG("key: %s\n", key);
223 blob_size
= key_size
* 2;
224 blob
= para_malloc(blob_size
);
225 ret
= base64_decode(key
, blob
, blob_size
);
234 ret2
= para_munmap(map
, map_size
);
235 if (ret
>= 0 && ret2
< 0)
245 /** ASN Types and their code. */
247 /** The next object is an integer. */
248 ASN1_TYPE_INTEGER
= 0x2,
249 /** Bit string object. */
250 ASN1_TYPE_BIT_STRING
= 0x03,
251 /** Keys start with one big type sequence. */
252 ASN1_TYPE_SEQUENCE
= 0x30,
255 /* bit 6 has value 0 */
256 static inline bool is_primitive(unsigned char c
)
258 return ((c
& (1<<6)) == 0);
261 static inline bool is_primitive_integer(unsigned char c
)
263 if (!is_primitive(c
))
265 return ((c
& 0x1f) == ASN1_TYPE_INTEGER
);
268 /* Bit 8 is zero (and bits 7-1 give the length) */
269 static inline bool is_short_form(unsigned char c
)
271 return (c
& 0x80) == 0;
274 static inline int get_short_form_length(unsigned char c
)
279 static inline int get_long_form_num_length_bytes(unsigned char c
)
284 static int find_pubkey_bignum_offset(const unsigned char *data
, int len
)
286 const unsigned char *p
= data
, *end
= data
+ len
;
288 /* the whole thing istarts with one sequence */
289 if (*p
!= ASN1_TYPE_SEQUENCE
)
290 return -E_ASN1_PARSE
;
293 return -E_ASN1_PARSE
;
294 if (is_short_form(*p
))
297 p
+= 1 + get_long_form_num_length_bytes(*p
);
299 return -E_ASN1_PARSE
;
300 /* another sequence containing the object id, skip it */
301 if (*p
!= ASN1_TYPE_SEQUENCE
)
302 return -E_ASN1_PARSE
;
305 return -E_ASN1_PARSE
;
306 if (!is_short_form(*p
))
307 return -E_ASN1_PARSE
;
308 p
+= 1 + get_short_form_length(*p
);
310 return -E_ASN1_PARSE
;
311 /* all numbers are wrapped in a bit string object that follows */
312 if (*p
!= ASN1_TYPE_BIT_STRING
)
313 return -E_ASN1_PARSE
;
316 return -E_ASN1_PARSE
;
317 if (is_short_form(*p
))
320 p
+= 1 + get_long_form_num_length_bytes(*p
);
321 p
++; /* skip number of unused bits in the bit string */
323 return -E_ASN1_PARSE
;
325 /* next, we have a sequence of two integers (n and e) */
326 if (*p
!= ASN1_TYPE_SEQUENCE
)
327 return -E_ASN1_PARSE
;
330 return -E_ASN1_PARSE
;
331 if (is_short_form(*p
))
334 p
+= 1 + get_long_form_num_length_bytes(*p
);
336 return -E_ASN1_PARSE
;
337 if (*p
!= ASN1_TYPE_INTEGER
)
338 return -E_ASN1_PARSE
;
343 * Returns: Number of bytes scanned. This may differ from the value returned via
344 * bn_bytes because the latter does not include the ASN.1 prefix and a leading
345 * zero is not considered as an additional byte for bn_bytes.
347 static int read_bignum(unsigned char *start
, unsigned char *end
, gcry_mpi_t
*bn
,
352 unsigned char *cp
= start
;
354 if (!is_primitive_integer(*cp
))
355 return -E_BAD_PRIVATE_KEY
;
357 if (is_short_form(*cp
)) {
358 bn_size
= get_short_form_length(*cp
);
361 int num_bytes
= get_long_form_num_length_bytes(*cp
);
362 if (cp
+ num_bytes
> end
)
363 return -E_BAD_PRIVATE_KEY
;
364 if (num_bytes
> 4) /* nobody has such a large modulus */
365 return -E_BAD_PRIVATE_KEY
;
368 for (i
= 0; i
< num_bytes
; i
++, cp
++)
369 bn_size
= (bn_size
<< 8) + *cp
;
371 PARA_DEBUG_LOG("bn_size %d (0x%x)\n", bn_size
, bn_size
);
372 gret
= gcry_mpi_scan(bn
, GCRYMPI_FMT_STD
, cp
, bn_size
, NULL
);
374 PARA_ERROR_LOG("%s while scanning n\n",
375 gcry_strerror(gcry_err_code(gret
)));
379 * Don't take the first leading zero into account for the size of the
389 // unsigned char *buf;
390 // gcry_mpi_aprint(GCRYMPI_FMT_HEX, &buf, NULL, *bn);
391 // PARA_CRIT_LOG("bn: %s\n", buf);
395 static int find_privkey_bignum_offset(const unsigned char *data
, int len
)
397 const unsigned char *p
= data
, *end
= data
+ len
;
399 /* like the public key, the whole thing is contained in a sequence */
400 if (*p
!= ASN1_TYPE_SEQUENCE
)
401 return -E_ASN1_PARSE
;
404 return -E_ASN1_PARSE
;
405 if (is_short_form(*p
))
408 p
+= 1 + get_long_form_num_length_bytes(*p
);
410 return -E_ASN1_PARSE
;
412 /* Skip next integer */
413 if (*p
!= ASN1_TYPE_INTEGER
)
414 return -E_ASN1_PARSE
;
417 return -E_ASN1_PARSE
;
418 if (is_short_form(*p
))
419 p
+= 1 + get_short_form_length(*p
);
421 p
+= 1 + get_long_form_num_length_bytes(*p
);
423 return -E_ASN1_PARSE
;
427 /** Private keys start with this header. */
428 #define PRIVATE_KEY_HEADER "-----BEGIN RSA PRIVATE KEY-----"
429 /** Private keys end with this footer. */
430 #define PRIVATE_KEY_FOOTER "-----END RSA PRIVATE KEY-----"
432 static int get_private_key(const char *key_file
, struct asymmetric_key
**result
)
434 gcry_mpi_t n
= NULL
, e
= NULL
, d
= NULL
, p
= NULL
, q
= NULL
,
436 unsigned char *blob
, *cp
, *end
;
437 int blob_size
, ret
, n_size
;
441 struct asymmetric_key
*key
;
443 ret
= decode_key(key_file
, PRIVATE_KEY_HEADER
, PRIVATE_KEY_FOOTER
,
448 end
= blob
+ blob_size
;
449 ret
= find_privkey_bignum_offset(blob
, blob_size
);
452 PARA_INFO_LOG("reading RSA params at offset %d\n", ret
);
455 ret
= read_bignum(cp
, end
, &n
, &n_size
);
460 ret
= read_bignum(cp
, end
, &e
, NULL
);
465 ret
= read_bignum(cp
, end
, &d
, NULL
);
470 ret
= read_bignum(cp
, end
, &p
, NULL
);
475 ret
= read_bignum(cp
, end
, &q
, NULL
);
479 ret
= read_bignum(cp
, end
, &u
, NULL
);
484 * OpenSSL uses slightly different parameters than gcrypt. To use these
485 * parameters we need to swap the values of p and q and recompute u.
487 if (gcry_mpi_cmp(p
, q
) > 0) {
489 gcry_mpi_invm(u
, p
, q
);
491 gret
= gcry_sexp_build(&sexp
, &erroff
, RSA_PRIVKEY_SEXP
,
495 PARA_ERROR_LOG("offset %zu: %s\n", erroff
,
496 gcry_strerror(gcry_err_code(gret
)));
500 key
= para_malloc(sizeof(*key
));
504 PARA_INFO_LOG("succesfully read %d bit private key\n", ret
);
522 /** Public keys start with this header. */
523 #define PUBLIC_KEY_HEADER "-----BEGIN PUBLIC KEY-----"
524 /** Public keys end with this footer. */
525 #define PUBLIC_KEY_FOOTER "-----END PUBLIC KEY-----"
527 static int get_asn_public_key(const char *key_file
, struct asymmetric_key
**result
)
529 gcry_mpi_t n
= NULL
, e
= NULL
;
530 unsigned char *blob
, *cp
, *end
;
531 int blob_size
, ret
, n_size
;
535 struct asymmetric_key
*key
;
537 ret
= decode_key(key_file
, PUBLIC_KEY_HEADER
, PUBLIC_KEY_FOOTER
,
542 end
= blob
+ blob_size
;
543 ret
= find_pubkey_bignum_offset(blob
, blob_size
);
546 PARA_DEBUG_LOG("decoding public RSA params at offset %d\n", ret
);
549 ret
= read_bignum(cp
, end
, &n
, &n_size
);
554 ret
= read_bignum(cp
, end
, &e
, NULL
);
559 gret
= gcry_sexp_build(&sexp
, &erroff
, RSA_PUBKEY_SEXP
, n
, e
);
561 PARA_ERROR_LOG("offset %zu: %s\n", erroff
,
562 gcry_strerror(gcry_err_code(gret
)));
566 key
= para_malloc(sizeof(*key
));
570 PARA_INFO_LOG("successfully read %u bit asn public key\n", n_size
* 8);
581 static int get_ssh_public_key(unsigned char *data
, int size
, gcry_sexp_t
*result
)
585 unsigned char *blob
= NULL
, *p
, *end
;
586 size_t nr_scanned
, erroff
, decoded_size
;
587 gcry_mpi_t e
= NULL
, n
= NULL
;
589 PARA_DEBUG_LOG("decoding %d byte public rsa-ssh key\n", size
);
590 if (size
> INT_MAX
/ 4)
591 return -ERRNO_TO_PARA_ERROR(EOVERFLOW
);
592 blob
= para_malloc(2 * size
);
593 ret
= uudecode((char *)data
, blob
, 2 * size
);
597 end
= blob
+ decoded_size
;
598 dump_buffer("decoded key", blob
, decoded_size
);
599 ret
= check_ssh_key_header(blob
, decoded_size
);
606 PARA_DEBUG_LOG("scanning modulus and public exponent\n");
607 gret
= gcry_mpi_scan(&e
, GCRYMPI_FMT_SSH
, p
, end
- p
, &nr_scanned
);
610 PARA_CRIT_LOG("%s\n", gcry_strerror(gcry_err_code(gret
)));
613 PARA_DEBUG_LOG("scanned e (%zu bytes)\n", nr_scanned
);
614 // gcry_mpi_aprint(GCRYMPI_FMT_HEX, &buf, NULL, rsa_e);
615 // PARA_CRIT_LOG("e: %s\n", buf);
619 gret
= gcry_mpi_scan(&n
, GCRYMPI_FMT_SSH
, p
, end
- p
, &nr_scanned
);
622 PARA_ERROR_LOG("%s\n", gcry_strerror(gcry_err_code(gret
)));
625 PARA_DEBUG_LOG("scanned n (%zu bytes)\n", nr_scanned
);
626 // gcry_mpi_aprint(GCRYMPI_FMT_HEX, &buf, NULL, rsa_n);
627 // PARA_CRIT_LOG("n: %s\n", buf);
628 gret
= gcry_sexp_build(result
, &erroff
, RSA_PUBKEY_SEXP
, n
, e
);
630 PARA_ERROR_LOG("offset %zu: %s\n", erroff
,
631 gcry_strerror(gcry_err_code(gret
)));
635 ret
= nr_scanned
/ 32 * 32;
636 PARA_INFO_LOG("successfully read %u bit ssh public key\n", ret
* 8);
646 int get_asymmetric_key(const char *key_file
, int private,
647 struct asymmetric_key
**result
)
652 unsigned char *start
, *end
;
654 struct asymmetric_key
*key
;
657 return get_private_key(key_file
, result
);
658 ret
= mmap_full_file(key_file
, O_RDONLY
, &map
, &map_size
, NULL
);
661 ret
= is_ssh_rsa_key(map
, map_size
);
663 ret
= para_munmap(map
, map_size
);
666 return get_asn_public_key(key_file
, result
);
669 end
= map
+ map_size
;
673 ret
= get_ssh_public_key(start
, end
- start
, &sexp
);
676 key
= para_malloc(sizeof(*key
));
677 key
->num_bytes
= ret
;
680 ret
= key
->num_bytes
;
682 ret2
= para_munmap(map
, map_size
);
683 if (ret
>= 0 && ret2
< 0)
688 void free_asymmetric_key(struct asymmetric_key
*key
)
692 gcry_sexp_release(key
->sexp
);
696 int priv_decrypt(const char *key_file
, unsigned char *outbuf
,
697 unsigned char *inbuf
, int inlen
)
701 struct asymmetric_key
*priv
;
702 gcry_mpi_t in_mpi
= NULL
, out_mpi
= NULL
;
703 gcry_sexp_t in
, out
, priv_key
;
705 unsigned char oaep_buf
[512];
707 PARA_INFO_LOG("decrypting %d byte input\n", inlen
);
708 /* key_file -> asymmetric key priv */
709 ret
= get_private_key(key_file
, &priv
);
714 /* asymmetric key priv -> sexp priv_key */
716 priv_key
= gcry_sexp_find_token(priv
->sexp
, "private-key", 0);
720 /* inbuf -> in_mpi */
721 gret
= gcry_mpi_scan(&in_mpi
, GCRYMPI_FMT_USG
, inbuf
,
724 PARA_ERROR_LOG("%s\n", gcrypt_strerror(gret
));
729 /* in_mpi -> in sexp */
730 gret
= gcry_sexp_build(&in
, NULL
, "(enc-val(rsa(a %m)))", in_mpi
);
732 PARA_ERROR_LOG("%s\n", gcrypt_strerror(gret
));
737 /* rsa decryption: in sexp -> out sexp */
738 gret
= gcry_pk_decrypt(&out
, in
, priv_key
);
740 PARA_ERROR_LOG("decrypt: %s\n", gcrypt_strerror(gret
));
741 ret
= -E_SEXP_DECRYPT
;
744 out_mpi
= gcry_sexp_nth_mpi(out
, 0, GCRYMPI_FMT_USG
);
749 gret
= gcry_mpi_print(GCRYMPI_FMT_USG
, oaep_buf
, sizeof(oaep_buf
),
752 PARA_ERROR_LOG("mpi_print: %s\n", gcrypt_strerror(gret
));
754 goto out_mpi_release
;
757 * An oaep-encoded buffer always starts with at least one zero byte.
758 * However, leading zeroes in an mpi are omitted in the output of
759 * gcry_mpi_print() when using the GCRYMPI_FMT_USG format. The
760 * alternative, GCRYMPI_FMT_STD, does not work either because here the
761 * leading zero(es) might also be omitted, depending on the value of
764 * To circumvent this, we shift the oaep buffer to the right. But first
765 * we check that the buffer actually started with a zero byte, i.e. that
766 * nbytes < key_size. Otherwise a decoding error occurred.
768 ret
= -E_SEXP_DECRYPT
;
769 if (nbytes
>= key_size
)
770 goto out_mpi_release
;
771 memmove(oaep_buf
+ key_size
- nbytes
, oaep_buf
, nbytes
);
772 memset(oaep_buf
, 0, key_size
- nbytes
);
774 PARA_DEBUG_LOG("decrypted buffer before unpad (%d bytes):\n",
776 dump_buffer("non-unpadded decrypted buffer", oaep_buf
, key_size
);;
777 unpad_oaep(oaep_buf
, key_size
, outbuf
, &nbytes
);
778 PARA_DEBUG_LOG("decrypted buffer after unpad (%zu bytes):\n",
780 dump_buffer("unpadded decrypted buffer", outbuf
, nbytes
);;
782 PARA_INFO_LOG("successfully decrypted %u byte message\n", ret
);
784 gcry_mpi_release(out_mpi
);
786 gcry_sexp_release(out
);
788 gcry_sexp_release(in
);
790 gcry_mpi_release(in_mpi
);
792 gcry_sexp_release(priv_key
);
794 free_asymmetric_key(priv
);
798 int pub_encrypt(struct asymmetric_key
*pub
, unsigned char *inbuf
,
799 unsigned len
, unsigned char *outbuf
)
802 const size_t pad_size
= 256;
803 gcry_sexp_t pub_key
, in
, out
, out_a
;
804 gcry_mpi_t out_mpi
= NULL
;
807 unsigned char padded_input
[256];
809 PARA_INFO_LOG("encrypting %u byte input with %d-byte key\n", len
, pub
->num_bytes
);
812 pub_key
= gcry_sexp_find_token(pub
->sexp
, "public-key", 0);
816 /* inbuf -> padded inbuf */
817 pad_oaep(inbuf
, len
, padded_input
, pad_size
);
819 /* padded inbuf -> in sexp */
820 gret
= gcry_sexp_build(&in
, NULL
, "(data(flags raw)(value %b))",
821 pad_size
, padded_input
);
823 PARA_ERROR_LOG("%s\n", gcrypt_strerror(gret
));
827 /* rsa sexp encryption: in -> out */
828 gret
= gcry_pk_encrypt(&out
, in
, pub_key
);
830 PARA_ERROR_LOG("%s\n", gcrypt_strerror(gret
));
831 ret
= -E_SEXP_ENCRYPT
;
834 /* extract a, an MPI with the result of the RSA operation */
836 out_a
= gcry_sexp_find_token(out
, "a", 0);
839 /* convert sexp out_a -> out_mpi */
840 out_mpi
= gcry_sexp_nth_mpi(out_a
, 1, GCRYMPI_FMT_STD
);
845 gret
= gcry_mpi_print(GCRYMPI_FMT_USG
, outbuf
, 512 /* FIXME */, &nbytes
, out_mpi
);
847 PARA_ERROR_LOG("%s\n", gcrypt_strerror(gret
));
848 ret
= -E_SEXP_ENCRYPT
;
849 goto out_mpi_release
;
851 PARA_INFO_LOG("encrypted buffer is %zu bytes\n", nbytes
);
852 dump_buffer("enc buf", outbuf
, nbytes
);
856 gcry_mpi_release(out_mpi
);
858 gcry_sexp_release(out_a
);
860 gcry_sexp_release(out
);
862 gcry_sexp_release(in
);
864 gcry_sexp_release(pub_key
);
868 struct stream_cipher
{
869 gcry_cipher_hd_t handle
;
872 struct stream_cipher
*sc_new(const unsigned char *data
, int len
)
876 struct stream_cipher
*sc
= para_malloc(sizeof(*sc
));
877 gret
= gcry_cipher_open(&sc
->handle
, GCRY_CIPHER_ARCFOUR
,
878 GCRY_CIPHER_MODE_STREAM
, 0);
880 PARA_ERROR_LOG("%s\n", gcrypt_strerror(gret
));
884 gret
= gcry_cipher_setkey(sc
->handle
, data
, (size_t)len
);
889 void sc_free(struct stream_cipher
*sc
)
893 gcry_cipher_close(sc
->handle
);
897 int sc_send_bin_buffer(struct stream_cipher_context
*scc
, char *buf
,
902 unsigned char *tmp
= para_malloc(size
);
905 gret
= gcry_cipher_encrypt(scc
->send
->handle
, tmp
, size
,
906 (unsigned char *)buf
, size
);
908 ret
= write_all(scc
->fd
, (char *)tmp
, &size
);
913 int sc_recv_bin_buffer(struct stream_cipher_context
*scc
, char *buf
,
917 ssize_t ret
= recv(scc
->fd
, buf
, size
, 0);
920 ret
= -ERRNO_TO_PARA_ERROR(errno
);
923 /* perform in-place encryption */
924 gret
= gcry_cipher_encrypt(scc
->recv
->handle
, (unsigned char *)buf
, ret
,