Annotation of src/usr.bin/ssh/digest-openssl.c, Revision 1.4
1.4 ! djm 1: /* $OpenBSD: digest-openssl.c,v 1.3 2014/06/24 01:13:21 djm 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:
1.3 djm 25: #include "sshbuf.h"
1.1 markus 26: #include "digest.h"
1.3 djm 27: #include "ssherr.h"
1.1 markus 28:
29: struct ssh_digest_ctx {
30: int alg;
31: EVP_MD_CTX mdctx;
32: };
33:
34: struct ssh_digest {
35: int id;
36: const char *name;
37: size_t digest_len;
38: const EVP_MD *(*mdfunc)(void);
39: };
40:
41: /* NB. Indexed directly by algorithm number */
42: const struct ssh_digest digests[] = {
43: { SSH_DIGEST_MD5, "MD5", 16, EVP_md5 },
44: { SSH_DIGEST_RIPEMD160, "RIPEMD160", 20, EVP_ripemd160 },
45: { SSH_DIGEST_SHA1, "SHA1", 20, EVP_sha1 },
46: { SSH_DIGEST_SHA256, "SHA256", 32, EVP_sha256 },
47: { SSH_DIGEST_SHA384, "SHA384", 48, EVP_sha384 },
48: { SSH_DIGEST_SHA512, "SHA512", 64, EVP_sha512 },
49: { -1, NULL, 0, NULL },
50: };
51:
52: static const struct ssh_digest *
53: ssh_digest_by_alg(int alg)
54: {
55: if (alg < 0 || alg >= SSH_DIGEST_MAX)
56: return NULL;
57: if (digests[alg].id != alg) /* sanity */
58: return NULL;
59: return &(digests[alg]);
60: }
61:
62: size_t
63: ssh_digest_bytes(int alg)
64: {
65: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
66:
67: return digest == NULL ? 0 : digest->digest_len;
68: }
69:
70: size_t
71: ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
72: {
73: return EVP_MD_CTX_block_size(&ctx->mdctx);
74: }
75:
76: struct ssh_digest_ctx *
77: ssh_digest_start(int alg)
78: {
79: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
80: struct ssh_digest_ctx *ret;
81:
82: if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL))
83: return NULL;
84: ret->alg = alg;
85: EVP_MD_CTX_init(&ret->mdctx);
86: if (EVP_DigestInit_ex(&ret->mdctx, digest->mdfunc(), NULL) != 1) {
87: free(ret);
88: return NULL;
89: }
90: return ret;
91: }
92:
93: int
94: ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
95: {
1.3 djm 96: if (from->alg != to->alg)
97: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 98: /* we have bcopy-style order while openssl has memcpy-style */
99: if (!EVP_MD_CTX_copy_ex(&to->mdctx, &from->mdctx))
1.3 djm 100: return SSH_ERR_LIBCRYPTO_ERROR;
1.1 markus 101: return 0;
102: }
103:
104: int
105: ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
106: {
107: if (EVP_DigestUpdate(&ctx->mdctx, m, mlen) != 1)
1.3 djm 108: return SSH_ERR_LIBCRYPTO_ERROR;
1.1 markus 109: return 0;
110: }
111:
112: int
1.3 djm 113: ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
1.1 markus 114: {
1.3 djm 115: return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
1.1 markus 116: }
117:
118: int
119: ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
120: {
121: const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
122: u_int l = dlen;
123:
124: if (dlen > UINT_MAX)
1.3 djm 125: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 126: if (dlen < digest->digest_len) /* No truncation allowed */
1.3 djm 127: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 128: if (EVP_DigestFinal_ex(&ctx->mdctx, d, &l) != 1)
1.3 djm 129: return SSH_ERR_LIBCRYPTO_ERROR;
1.1 markus 130: if (l != digest->digest_len) /* sanity */
1.3 djm 131: return SSH_ERR_INTERNAL_ERROR;
1.1 markus 132: return 0;
133: }
134:
135: void
136: ssh_digest_free(struct ssh_digest_ctx *ctx)
137: {
138: if (ctx != NULL) {
139: EVP_MD_CTX_cleanup(&ctx->mdctx);
1.2 djm 140: explicit_bzero(ctx, sizeof(*ctx));
1.1 markus 141: free(ctx);
142: }
143: }
144:
145: int
146: ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
147: {
1.4 ! djm 148: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
! 149: u_int mdlen;
1.1 markus 150:
1.4 ! djm 151: if (digest == NULL)
! 152: return SSH_ERR_INVALID_ARGUMENT;
! 153: if (dlen > UINT_MAX)
1.3 djm 154: return SSH_ERR_INVALID_ARGUMENT;
1.4 ! djm 155: if (dlen < digest->digest_len)
! 156: return SSH_ERR_INVALID_ARGUMENT;
! 157: mdlen = dlen;
! 158: if (!EVP_Digest(m, mlen, d, &mdlen, digest->mdfunc(), NULL))
! 159: return SSH_ERR_LIBCRYPTO_ERROR;
1.1 markus 160: return 0;
161: }
162:
163: int
1.3 djm 164: ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
1.1 markus 165: {
1.3 djm 166: return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
1.1 markus 167: }
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