Annotation of src/usr.bin/ssh/ssh-rsa.c, Revision 1.72
1.72 ! djm 1: /* $OpenBSD: ssh-rsa.c,v 1.71 2022/10/28 00:37:24 djm Exp $ */
1.1 markus 2: /*
1.30 markus 3: * Copyright (c) 2000, 2003 Markus Friedl <markus@openbsd.org>
1.1 markus 4: *
1.30 markus 5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
1.1 markus 8: *
1.30 markus 9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 markus 16: */
1.39 deraadt 17:
18: #include <sys/types.h>
1.5 markus 19:
20: #include <openssl/evp.h>
21: #include <openssl/err.h>
1.38 stevesk 22:
23: #include <string.h>
1.1 markus 24:
1.52 djm 25: #include "sshbuf.h"
1.8 markus 26: #include "compat.h"
1.52 djm 27: #include "ssherr.h"
28: #define SSHKEY_INTERNAL
29: #include "sshkey.h"
1.50 djm 30: #include "digest.h"
1.64 djm 31: #include "log.h"
1.1 markus 32:
1.52 djm 33: static int openssh_RSA_verify(int, u_char *, size_t, u_char *, size_t, RSA *);
1.25 markus 34:
1.69 djm 35: static u_int
36: ssh_rsa_size(const struct sshkey *key)
37: {
38: const BIGNUM *rsa_n;
39:
40: if (key->rsa == NULL)
41: return 0;
42: RSA_get0_key(key->rsa, &rsa_n, NULL, NULL);
43: return BN_num_bits(rsa_n);
44: }
45:
46: static int
47: ssh_rsa_alloc(struct sshkey *k)
48: {
49: if ((k->rsa = RSA_new()) == NULL)
50: return SSH_ERR_ALLOC_FAIL;
51: return 0;
52: }
53:
54: static void
55: ssh_rsa_cleanup(struct sshkey *k)
56: {
57: RSA_free(k->rsa);
58: k->rsa = NULL;
59: }
60:
1.70 djm 61: static int
62: ssh_rsa_equal(const struct sshkey *a, const struct sshkey *b)
63: {
64: const BIGNUM *rsa_e_a, *rsa_n_a;
65: const BIGNUM *rsa_e_b, *rsa_n_b;
66:
67: if (a->rsa == NULL || b->rsa == NULL)
68: return 0;
69: RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL);
70: RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL);
71: if (rsa_e_a == NULL || rsa_e_b == NULL)
72: return 0;
73: if (rsa_n_a == NULL || rsa_n_b == NULL)
74: return 0;
75: if (BN_cmp(rsa_e_a, rsa_e_b) != 0)
76: return 0;
77: if (BN_cmp(rsa_n_a, rsa_n_b) != 0)
78: return 0;
79: return 1;
80: }
81:
1.71 djm 82: static int
83: ssh_rsa_serialize_public(const struct sshkey *key, struct sshbuf *b,
84: const char *typename, enum sshkey_serialize_rep opts)
85: {
86: int r;
87: const BIGNUM *rsa_n, *rsa_e;
88:
89: if (key->rsa == NULL)
90: return SSH_ERR_INVALID_ARGUMENT;
91: RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL);
92: if ((r = sshbuf_put_cstring(b, typename)) != 0 ||
93: (r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
94: (r = sshbuf_put_bignum2(b, rsa_n)) != 0)
95: return r;
96:
97: return 0;
98: }
99:
1.72 ! djm 100: static int
! 101: ssh_rsa_generate(struct sshkey *k, int bits)
! 102: {
! 103: RSA *private = NULL;
! 104: BIGNUM *f4 = NULL;
! 105: int ret = SSH_ERR_INTERNAL_ERROR;
! 106:
! 107: if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
! 108: bits > SSHBUF_MAX_BIGNUM * 8)
! 109: return SSH_ERR_KEY_LENGTH;
! 110: if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) {
! 111: ret = SSH_ERR_ALLOC_FAIL;
! 112: goto out;
! 113: }
! 114: if (!BN_set_word(f4, RSA_F4) ||
! 115: !RSA_generate_key_ex(private, bits, f4, NULL)) {
! 116: ret = SSH_ERR_LIBCRYPTO_ERROR;
! 117: goto out;
! 118: }
! 119: k->rsa = private;
! 120: private = NULL;
! 121: ret = 0;
! 122: out:
! 123: RSA_free(private);
! 124: BN_free(f4);
! 125: return ret;
! 126: }
! 127:
1.55 markus 128: static const char *
129: rsa_hash_alg_ident(int hash_alg)
130: {
131: switch (hash_alg) {
132: case SSH_DIGEST_SHA1:
133: return "ssh-rsa";
134: case SSH_DIGEST_SHA256:
135: return "rsa-sha2-256";
136: case SSH_DIGEST_SHA512:
137: return "rsa-sha2-512";
138: }
139: return NULL;
140: }
141:
1.67 djm 142: /*
143: * Returns the hash algorithm ID for a given algorithm identifier as used
144: * inside the signature blob,
145: */
1.55 markus 146: static int
1.67 djm 147: rsa_hash_id_from_ident(const char *ident)
1.55 markus 148: {
1.67 djm 149: if (strcmp(ident, "ssh-rsa") == 0)
1.55 markus 150: return SSH_DIGEST_SHA1;
151: if (strcmp(ident, "rsa-sha2-256") == 0)
152: return SSH_DIGEST_SHA256;
153: if (strcmp(ident, "rsa-sha2-512") == 0)
154: return SSH_DIGEST_SHA512;
155: return -1;
156: }
157:
1.67 djm 158: /*
159: * Return the hash algorithm ID for the specified key name. This includes
160: * all the cases of rsa_hash_id_from_ident() but also the certificate key
161: * types.
162: */
163: static int
164: rsa_hash_id_from_keyname(const char *alg)
165: {
166: int r;
167:
168: if ((r = rsa_hash_id_from_ident(alg)) != -1)
169: return r;
170: if (strcmp(alg, "ssh-rsa-cert-v01@openssh.com") == 0)
171: return SSH_DIGEST_SHA1;
172: if (strcmp(alg, "rsa-sha2-256-cert-v01@openssh.com") == 0)
173: return SSH_DIGEST_SHA256;
174: if (strcmp(alg, "rsa-sha2-512-cert-v01@openssh.com") == 0)
175: return SSH_DIGEST_SHA512;
176: return -1;
177: }
178:
1.55 markus 179: static int
180: rsa_hash_alg_nid(int type)
181: {
182: switch (type) {
183: case SSH_DIGEST_SHA1:
184: return NID_sha1;
185: case SSH_DIGEST_SHA256:
186: return NID_sha256;
187: case SSH_DIGEST_SHA512:
188: return NID_sha512;
189: default:
190: return -1;
191: }
1.62 djm 192: }
193:
194: int
1.68 djm 195: ssh_rsa_complete_crt_parameters(struct sshkey *key, const BIGNUM *iqmp)
1.62 djm 196: {
1.68 djm 197: const BIGNUM *rsa_p, *rsa_q, *rsa_d;
198: BIGNUM *aux = NULL, *d_consttime = NULL;
199: BIGNUM *rsa_dmq1 = NULL, *rsa_dmp1 = NULL, *rsa_iqmp = NULL;
1.62 djm 200: BN_CTX *ctx = NULL;
201: int r;
202:
203: if (key == NULL || key->rsa == NULL ||
204: sshkey_type_plain(key->type) != KEY_RSA)
205: return SSH_ERR_INVALID_ARGUMENT;
206:
1.68 djm 207: RSA_get0_key(key->rsa, NULL, NULL, &rsa_d);
208: RSA_get0_factors(key->rsa, &rsa_p, &rsa_q);
209:
1.62 djm 210: if ((ctx = BN_CTX_new()) == NULL)
211: return SSH_ERR_ALLOC_FAIL;
1.68 djm 212: if ((aux = BN_new()) == NULL ||
213: (rsa_dmq1 = BN_new()) == NULL ||
214: (rsa_dmp1 = BN_new()) == NULL)
215: return SSH_ERR_ALLOC_FAIL;
216: if ((d_consttime = BN_dup(rsa_d)) == NULL ||
217: (rsa_iqmp = BN_dup(iqmp)) == NULL) {
1.62 djm 218: r = SSH_ERR_ALLOC_FAIL;
219: goto out;
220: }
1.66 jsing 221: BN_set_flags(aux, BN_FLG_CONSTTIME);
1.68 djm 222: BN_set_flags(d_consttime, BN_FLG_CONSTTIME);
1.62 djm 223:
1.68 djm 224: if ((BN_sub(aux, rsa_q, BN_value_one()) == 0) ||
225: (BN_mod(rsa_dmq1, d_consttime, aux, ctx) == 0) ||
226: (BN_sub(aux, rsa_p, BN_value_one()) == 0) ||
227: (BN_mod(rsa_dmp1, d_consttime, aux, ctx) == 0)) {
228: r = SSH_ERR_LIBCRYPTO_ERROR;
229: goto out;
230: }
231: if (!RSA_set0_crt_params(key->rsa, rsa_dmp1, rsa_dmq1, rsa_iqmp)) {
1.62 djm 232: r = SSH_ERR_LIBCRYPTO_ERROR;
233: goto out;
234: }
1.68 djm 235: rsa_dmp1 = rsa_dmq1 = rsa_iqmp = NULL; /* transferred */
236: /* success */
1.62 djm 237: r = 0;
238: out:
239: BN_clear_free(aux);
1.68 djm 240: BN_clear_free(d_consttime);
241: BN_clear_free(rsa_dmp1);
242: BN_clear_free(rsa_dmq1);
243: BN_clear_free(rsa_iqmp);
1.62 djm 244: BN_CTX_free(ctx);
245: return r;
1.55 markus 246: }
247:
1.1 markus 248: /* RSASSA-PKCS1-v1_5 (PKCS #1 v2.0 signature) with SHA1 */
249: int
1.52 djm 250: ssh_rsa_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
1.55 markus 251: const u_char *data, size_t datalen, const char *alg_ident)
1.1 markus 252: {
1.68 djm 253: const BIGNUM *rsa_n;
1.52 djm 254: u_char digest[SSH_DIGEST_MAX_LENGTH], *sig = NULL;
1.65 jsing 255: size_t slen = 0;
1.52 djm 256: u_int dlen, len;
1.55 markus 257: int nid, hash_alg, ret = SSH_ERR_INTERNAL_ERROR;
1.52 djm 258: struct sshbuf *b = NULL;
259:
260: if (lenp != NULL)
261: *lenp = 0;
262: if (sigp != NULL)
263: *sigp = NULL;
264:
1.60 djm 265: if (alg_ident == NULL || strlen(alg_ident) == 0)
1.56 markus 266: hash_alg = SSH_DIGEST_SHA1;
267: else
1.67 djm 268: hash_alg = rsa_hash_id_from_keyname(alg_ident);
1.55 markus 269: if (key == NULL || key->rsa == NULL || hash_alg == -1 ||
1.61 djm 270: sshkey_type_plain(key->type) != KEY_RSA)
1.52 djm 271: return SSH_ERR_INVALID_ARGUMENT;
1.68 djm 272: RSA_get0_key(key->rsa, &rsa_n, NULL, NULL);
273: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
1.61 djm 274: return SSH_ERR_KEY_LENGTH;
1.52 djm 275: slen = RSA_size(key->rsa);
276: if (slen <= 0 || slen > SSHBUF_MAX_BIGNUM)
277: return SSH_ERR_INVALID_ARGUMENT;
1.47 djm 278:
1.50 djm 279: /* hash the data */
1.55 markus 280: nid = rsa_hash_alg_nid(hash_alg);
1.52 djm 281: if ((dlen = ssh_digest_bytes(hash_alg)) == 0)
282: return SSH_ERR_INTERNAL_ERROR;
283: if ((ret = ssh_digest_memory(hash_alg, data, datalen,
284: digest, sizeof(digest))) != 0)
285: goto out;
286:
287: if ((sig = malloc(slen)) == NULL) {
288: ret = SSH_ERR_ALLOC_FAIL;
289: goto out;
1.50 djm 290: }
1.1 markus 291:
1.52 djm 292: if (RSA_sign(nid, digest, dlen, sig, &len, key->rsa) != 1) {
293: ret = SSH_ERR_LIBCRYPTO_ERROR;
294: goto out;
1.1 markus 295: }
296: if (len < slen) {
1.52 djm 297: size_t diff = slen - len;
1.1 markus 298: memmove(sig + diff, sig, len);
1.51 djm 299: explicit_bzero(sig, diff);
1.1 markus 300: } else if (len > slen) {
1.52 djm 301: ret = SSH_ERR_INTERNAL_ERROR;
302: goto out;
1.1 markus 303: }
304: /* encode signature */
1.52 djm 305: if ((b = sshbuf_new()) == NULL) {
306: ret = SSH_ERR_ALLOC_FAIL;
307: goto out;
308: }
1.55 markus 309: if ((ret = sshbuf_put_cstring(b, rsa_hash_alg_ident(hash_alg))) != 0 ||
1.52 djm 310: (ret = sshbuf_put_string(b, sig, slen)) != 0)
311: goto out;
312: len = sshbuf_len(b);
313: if (sigp != NULL) {
314: if ((*sigp = malloc(len)) == NULL) {
315: ret = SSH_ERR_ALLOC_FAIL;
316: goto out;
317: }
318: memcpy(*sigp, sshbuf_ptr(b), len);
319: }
1.23 markus 320: if (lenp != NULL)
321: *lenp = len;
1.52 djm 322: ret = 0;
323: out:
324: explicit_bzero(digest, sizeof(digest));
1.65 jsing 325: freezero(sig, slen);
1.58 mmcc 326: sshbuf_free(b);
1.53 djm 327: return ret;
1.1 markus 328: }
329:
330: int
1.52 djm 331: ssh_rsa_verify(const struct sshkey *key,
1.63 djm 332: const u_char *sig, size_t siglen, const u_char *data, size_t datalen,
333: const char *alg)
1.1 markus 334: {
1.68 djm 335: const BIGNUM *rsa_n;
1.63 djm 336: char *sigtype = NULL;
1.67 djm 337: int hash_alg, want_alg, ret = SSH_ERR_INTERNAL_ERROR;
1.65 jsing 338: size_t len = 0, diff, modlen, dlen;
1.52 djm 339: struct sshbuf *b = NULL;
340: u_char digest[SSH_DIGEST_MAX_LENGTH], *osigblob, *sigblob = NULL;
341:
342: if (key == NULL || key->rsa == NULL ||
343: sshkey_type_plain(key->type) != KEY_RSA ||
1.59 djm 344: sig == NULL || siglen == 0)
1.52 djm 345: return SSH_ERR_INVALID_ARGUMENT;
1.68 djm 346: RSA_get0_key(key->rsa, &rsa_n, NULL, NULL);
347: if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE)
1.61 djm 348: return SSH_ERR_KEY_LENGTH;
1.52 djm 349:
1.55 markus 350: if ((b = sshbuf_from(sig, siglen)) == NULL)
1.52 djm 351: return SSH_ERR_ALLOC_FAIL;
1.63 djm 352: if (sshbuf_get_cstring(b, &sigtype, NULL) != 0) {
1.52 djm 353: ret = SSH_ERR_INVALID_FORMAT;
354: goto out;
355: }
1.67 djm 356: if ((hash_alg = rsa_hash_id_from_ident(sigtype)) == -1) {
357: ret = SSH_ERR_KEY_TYPE_MISMATCH;
1.63 djm 358: goto out;
359: }
1.67 djm 360: /*
361: * Allow ssh-rsa-cert-v01 certs to generate SHA2 signatures for
362: * legacy reasons, but otherwise the signature type should match.
363: */
364: if (alg != NULL && strcmp(alg, "ssh-rsa-cert-v01@openssh.com") != 0) {
365: if ((want_alg = rsa_hash_id_from_keyname(alg)) == -1) {
366: ret = SSH_ERR_INVALID_ARGUMENT;
367: goto out;
368: }
369: if (hash_alg != want_alg) {
370: ret = SSH_ERR_SIGNATURE_INVALID;
371: goto out;
372: }
1.1 markus 373: }
1.52 djm 374: if (sshbuf_get_string(b, &sigblob, &len) != 0) {
375: ret = SSH_ERR_INVALID_FORMAT;
376: goto out;
377: }
378: if (sshbuf_len(b) != 0) {
379: ret = SSH_ERR_UNEXPECTED_TRAILING_DATA;
380: goto out;
1.19 markus 381: }
382: /* RSA_verify expects a signature of RSA_size */
383: modlen = RSA_size(key->rsa);
384: if (len > modlen) {
1.52 djm 385: ret = SSH_ERR_KEY_BITS_MISMATCH;
386: goto out;
1.19 markus 387: } else if (len < modlen) {
1.52 djm 388: diff = modlen - len;
389: osigblob = sigblob;
390: if ((sigblob = realloc(sigblob, modlen)) == NULL) {
391: sigblob = osigblob; /* put it back for clear/free */
392: ret = SSH_ERR_ALLOC_FAIL;
393: goto out;
394: }
1.19 markus 395: memmove(sigblob + diff, sigblob, len);
1.51 djm 396: explicit_bzero(sigblob, diff);
1.19 markus 397: len = modlen;
1.1 markus 398: }
1.50 djm 399: if ((dlen = ssh_digest_bytes(hash_alg)) == 0) {
1.52 djm 400: ret = SSH_ERR_INTERNAL_ERROR;
401: goto out;
1.7 markus 402: }
1.52 djm 403: if ((ret = ssh_digest_memory(hash_alg, data, datalen,
404: digest, sizeof(digest))) != 0)
405: goto out;
1.1 markus 406:
1.50 djm 407: ret = openssh_RSA_verify(hash_alg, digest, dlen, sigblob, len,
408: key->rsa);
1.52 djm 409: out:
1.65 jsing 410: freezero(sigblob, len);
1.63 djm 411: free(sigtype);
1.58 mmcc 412: sshbuf_free(b);
1.51 djm 413: explicit_bzero(digest, sizeof(digest));
1.25 markus 414: return ret;
415: }
416:
417: /*
418: * See:
419: * http://www.rsasecurity.com/rsalabs/pkcs/pkcs-1/
420: * ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.asn
421: */
1.55 markus 422:
1.25 markus 423: /*
424: * id-sha1 OBJECT IDENTIFIER ::= { iso(1) identified-organization(3)
425: * oiw(14) secsig(3) algorithms(2) 26 }
426: */
427: static const u_char id_sha1[] = {
428: 0x30, 0x21, /* type Sequence, length 0x21 (33) */
429: 0x30, 0x09, /* type Sequence, length 0x09 */
430: 0x06, 0x05, /* type OID, length 0x05 */
431: 0x2b, 0x0e, 0x03, 0x02, 0x1a, /* id-sha1 OID */
432: 0x05, 0x00, /* NULL */
433: 0x04, 0x14 /* Octet string, length 0x14 (20), followed by sha1 hash */
434: };
435:
1.55 markus 436: /*
437: * See http://csrc.nist.gov/groups/ST/crypto_apps_infra/csor/algorithms.html
438: * id-sha256 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840)
439: * organization(1) gov(101) csor(3) nistAlgorithm(4) hashAlgs(2)
440: * id-sha256(1) }
441: */
442: static const u_char id_sha256[] = {
443: 0x30, 0x31, /* type Sequence, length 0x31 (49) */
444: 0x30, 0x0d, /* type Sequence, length 0x0d (13) */
445: 0x06, 0x09, /* type OID, length 0x09 */
446: 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, /* id-sha256 */
447: 0x05, 0x00, /* NULL */
448: 0x04, 0x20 /* Octet string, length 0x20 (32), followed by sha256 hash */
449: };
450:
451: /*
452: * See http://csrc.nist.gov/groups/ST/crypto_apps_infra/csor/algorithms.html
453: * id-sha512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840)
454: * organization(1) gov(101) csor(3) nistAlgorithm(4) hashAlgs(2)
455: * id-sha256(3) }
456: */
457: static const u_char id_sha512[] = {
458: 0x30, 0x51, /* type Sequence, length 0x51 (81) */
459: 0x30, 0x0d, /* type Sequence, length 0x0d (13) */
460: 0x06, 0x09, /* type OID, length 0x09 */
461: 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, /* id-sha512 */
462: 0x05, 0x00, /* NULL */
463: 0x04, 0x40 /* Octet string, length 0x40 (64), followed by sha512 hash */
464: };
465:
466: static int
467: rsa_hash_alg_oid(int hash_alg, const u_char **oidp, size_t *oidlenp)
468: {
469: switch (hash_alg) {
470: case SSH_DIGEST_SHA1:
471: *oidp = id_sha1;
472: *oidlenp = sizeof(id_sha1);
473: break;
474: case SSH_DIGEST_SHA256:
475: *oidp = id_sha256;
476: *oidlenp = sizeof(id_sha256);
477: break;
478: case SSH_DIGEST_SHA512:
479: *oidp = id_sha512;
480: *oidlenp = sizeof(id_sha512);
481: break;
482: default:
483: return SSH_ERR_INVALID_ARGUMENT;
484: }
485: return 0;
486: }
487:
1.25 markus 488: static int
1.52 djm 489: openssh_RSA_verify(int hash_alg, u_char *hash, size_t hashlen,
490: u_char *sigbuf, size_t siglen, RSA *rsa)
1.25 markus 491: {
1.54 djm 492: size_t rsasize = 0, oidlen = 0, hlen = 0;
493: int ret, len, oidmatch, hashmatch;
1.25 markus 494: const u_char *oid = NULL;
495: u_char *decrypted = NULL;
496:
1.55 markus 497: if ((ret = rsa_hash_alg_oid(hash_alg, &oid, &oidlen)) != 0)
498: return ret;
1.52 djm 499: ret = SSH_ERR_INTERNAL_ERROR;
1.55 markus 500: hlen = ssh_digest_bytes(hash_alg);
1.25 markus 501: if (hashlen != hlen) {
1.52 djm 502: ret = SSH_ERR_INVALID_ARGUMENT;
1.25 markus 503: goto done;
504: }
505: rsasize = RSA_size(rsa);
1.52 djm 506: if (rsasize <= 0 || rsasize > SSHBUF_MAX_BIGNUM ||
507: siglen == 0 || siglen > rsasize) {
508: ret = SSH_ERR_INVALID_ARGUMENT;
509: goto done;
510: }
511: if ((decrypted = malloc(rsasize)) == NULL) {
512: ret = SSH_ERR_ALLOC_FAIL;
1.25 markus 513: goto done;
514: }
515: if ((len = RSA_public_decrypt(siglen, sigbuf, decrypted, rsa,
516: RSA_PKCS1_PADDING)) < 0) {
1.52 djm 517: ret = SSH_ERR_LIBCRYPTO_ERROR;
1.25 markus 518: goto done;
519: }
1.52 djm 520: if (len < 0 || (size_t)len != hlen + oidlen) {
521: ret = SSH_ERR_INVALID_FORMAT;
1.25 markus 522: goto done;
523: }
1.44 djm 524: oidmatch = timingsafe_bcmp(decrypted, oid, oidlen) == 0;
525: hashmatch = timingsafe_bcmp(decrypted + oidlen, hash, hlen) == 0;
1.52 djm 526: if (!oidmatch || !hashmatch) {
527: ret = SSH_ERR_SIGNATURE_INVALID;
1.25 markus 528: goto done;
529: }
1.52 djm 530: ret = 0;
531: done:
1.65 jsing 532: freezero(decrypted, rsasize);
1.1 markus 533: return ret;
534: }
1.69 djm 535:
536: static const struct sshkey_impl_funcs sshkey_rsa_funcs = {
537: /* .size = */ ssh_rsa_size,
538: /* .alloc = */ ssh_rsa_alloc,
539: /* .cleanup = */ ssh_rsa_cleanup,
1.70 djm 540: /* .equal = */ ssh_rsa_equal,
1.71 djm 541: /* .ssh_serialize_public = */ ssh_rsa_serialize_public,
1.72 ! djm 542: /* .generate = */ ssh_rsa_generate,
1.69 djm 543: };
544:
545: const struct sshkey_impl sshkey_rsa_impl = {
546: /* .name = */ "ssh-rsa",
547: /* .shortname = */ "RSA",
548: /* .sigalg = */ NULL,
549: /* .type = */ KEY_RSA,
550: /* .nid = */ 0,
551: /* .cert = */ 0,
552: /* .sigonly = */ 0,
553: /* .keybits = */ 0,
554: /* .funcs = */ &sshkey_rsa_funcs,
555: };
556:
557: const struct sshkey_impl sshkey_rsa_cert_impl = {
558: /* .name = */ "ssh-rsa-cert-v01@openssh.com",
559: /* .shortname = */ "RSA-CERT",
560: /* .sigalg = */ NULL,
561: /* .type = */ KEY_RSA_CERT,
562: /* .nid = */ 0,
563: /* .cert = */ 1,
564: /* .sigonly = */ 0,
565: /* .keybits = */ 0,
566: /* .funcs = */ &sshkey_rsa_funcs,
567: };
568:
569: /* SHA2 signature algorithms */
570:
571: const struct sshkey_impl sshkey_rsa_sha256_impl = {
572: /* .name = */ "rsa-sha2-256",
573: /* .shortname = */ "RSA",
574: /* .sigalg = */ NULL,
575: /* .type = */ KEY_RSA,
576: /* .nid = */ 0,
577: /* .cert = */ 0,
578: /* .sigonly = */ 1,
579: /* .keybits = */ 0,
580: /* .funcs = */ &sshkey_rsa_funcs,
581: };
582:
583: const struct sshkey_impl sshkey_rsa_sha512_impl = {
584: /* .name = */ "rsa-sha2-512",
585: /* .shortname = */ "RSA",
586: /* .sigalg = */ NULL,
587: /* .type = */ KEY_RSA,
588: /* .nid = */ 0,
589: /* .cert = */ 0,
590: /* .sigonly = */ 1,
591: /* .keybits = */ 0,
592: /* .funcs = */ &sshkey_rsa_funcs,
593: };
594:
595: const struct sshkey_impl sshkey_rsa_sha256_cert_impl = {
596: /* .name = */ "rsa-sha2-256-cert-v01@openssh.com",
597: /* .shortname = */ "RSA-CERT",
598: /* .sigalg = */ "rsa-sha2-256",
599: /* .type = */ KEY_RSA_CERT,
600: /* .nid = */ 0,
601: /* .cert = */ 1,
602: /* .sigonly = */ 1,
603: /* .keybits = */ 0,
604: /* .funcs = */ &sshkey_rsa_funcs,
605: };
606:
607: const struct sshkey_impl sshkey_rsa_sha512_cert_impl = {
608: /* .name = */ "rsa-sha2-512-cert-v01@openssh.com",
609: /* .shortname = */ "RSA-CERT",
610: /* .sigalg = */ "rsa-sha2-512",
611: /* .type = */ KEY_RSA_CERT,
612: /* .nid = */ 0,
613: /* .cert = */ 1,
614: /* .sigonly = */ 1,
615: /* .keybits = */ 0,
616: /* .funcs = */ &sshkey_rsa_funcs,
617: };
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