Annotation of src/usr.bin/ssh/digest-openssl.c, Revision 1.2
1.2 ! djm 1: /* $OpenBSD: digest-openssl.c,v 1.1 2014/01/28 20:13:46 markus Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2013 Damien Miller <djm@mindrot.org>
4: *
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.
8: *
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.
16: */
17:
18: #include <sys/types.h>
19: #include <limits.h>
20: #include <stdlib.h>
21: #include <string.h>
22:
23: #include <openssl/evp.h>
24:
25: #include "buffer.h"
26: #include "digest.h"
27:
28: struct ssh_digest_ctx {
29: int alg;
30: EVP_MD_CTX mdctx;
31: };
32:
33: struct ssh_digest {
34: int id;
35: const char *name;
36: size_t digest_len;
37: const EVP_MD *(*mdfunc)(void);
38: };
39:
40: /* NB. Indexed directly by algorithm number */
41: const struct ssh_digest digests[] = {
42: { SSH_DIGEST_MD5, "MD5", 16, EVP_md5 },
43: { SSH_DIGEST_RIPEMD160, "RIPEMD160", 20, EVP_ripemd160 },
44: { SSH_DIGEST_SHA1, "SHA1", 20, EVP_sha1 },
45: { SSH_DIGEST_SHA256, "SHA256", 32, EVP_sha256 },
46: { SSH_DIGEST_SHA384, "SHA384", 48, EVP_sha384 },
47: { SSH_DIGEST_SHA512, "SHA512", 64, EVP_sha512 },
48: { -1, NULL, 0, NULL },
49: };
50:
51: static const struct ssh_digest *
52: ssh_digest_by_alg(int alg)
53: {
54: if (alg < 0 || alg >= SSH_DIGEST_MAX)
55: return NULL;
56: if (digests[alg].id != alg) /* sanity */
57: return NULL;
58: return &(digests[alg]);
59: }
60:
61: size_t
62: ssh_digest_bytes(int alg)
63: {
64: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
65:
66: return digest == NULL ? 0 : digest->digest_len;
67: }
68:
69: size_t
70: ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
71: {
72: return EVP_MD_CTX_block_size(&ctx->mdctx);
73: }
74:
75: struct ssh_digest_ctx *
76: ssh_digest_start(int alg)
77: {
78: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
79: struct ssh_digest_ctx *ret;
80:
81: if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL))
82: return NULL;
83: ret->alg = alg;
84: EVP_MD_CTX_init(&ret->mdctx);
85: if (EVP_DigestInit_ex(&ret->mdctx, digest->mdfunc(), NULL) != 1) {
86: free(ret);
87: return NULL;
88: }
89: return ret;
90: }
91:
92: int
93: ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
94: {
95: /* we have bcopy-style order while openssl has memcpy-style */
96: if (!EVP_MD_CTX_copy_ex(&to->mdctx, &from->mdctx))
97: return -1;
98: return 0;
99: }
100:
101: int
102: ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
103: {
104: if (EVP_DigestUpdate(&ctx->mdctx, m, mlen) != 1)
105: return -1;
106: return 0;
107: }
108:
109: int
110: ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b)
111: {
112: return ssh_digest_update(ctx, buffer_ptr(b), buffer_len(b));
113: }
114:
115: int
116: ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
117: {
118: const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
119: u_int l = dlen;
120:
121: if (dlen > UINT_MAX)
122: return -1;
123: if (dlen < digest->digest_len) /* No truncation allowed */
124: return -1;
125: if (EVP_DigestFinal_ex(&ctx->mdctx, d, &l) != 1)
126: return -1;
127: if (l != digest->digest_len) /* sanity */
128: return -1;
129: return 0;
130: }
131:
132: void
133: ssh_digest_free(struct ssh_digest_ctx *ctx)
134: {
135: if (ctx != NULL) {
136: EVP_MD_CTX_cleanup(&ctx->mdctx);
1.2 ! djm 137: explicit_bzero(ctx, sizeof(*ctx));
1.1 markus 138: free(ctx);
139: }
140: }
141:
142: int
143: ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
144: {
145: struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
146:
147: if (ctx == NULL)
148: return -1;
149: if (ssh_digest_update(ctx, m, mlen) != 0 ||
150: ssh_digest_final(ctx, d, dlen) != 0)
151: return -1;
152: ssh_digest_free(ctx);
153: return 0;
154: }
155:
156: int
157: ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen)
158: {
159: return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen);
160: }
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