Return to digest.c CVS log

Up to [local] / src / usr.bin / ssh

Annotation of src/usr.bin/ssh/digest.c, Revision 1.1

1.1     ! djm         1: /* $OpenBSD$ */
        !             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/bn.h> /* for buffer.h */
        !            24: #include <openssl/ec.h> /* for buffer.h */
        !            25: #include <openssl/evp.h>
        !            26:
        !            27: #include "buffer.h"
        !            28: #include "digest.h"
        !            29:
        !            30: struct ssh_digest_ctx {
        !            31:        int alg;
        !            32:        EVP_MD_CTX mdctx;
        !            33: };
        !            34:
        !            35: struct ssh_digest {
        !            36:        int id;
        !            37:        const char *name;
        !            38:        size_t digest_len;
        !            39:        const EVP_MD *(*mdfunc)(void);
        !            40: };
        !            41:
        !            42: /* NB. Indexed directly by algorithm number */
        !            43: const struct ssh_digest digests[] = {
        !            44:        { SSH_DIGEST_MD5,       "MD5",          16,     EVP_md5 },
        !            45:        { SSH_DIGEST_RIPEMD160, "RIPEMD160",    20,     EVP_ripemd160 },
        !            46:        { SSH_DIGEST_SHA1,      "SHA1",         20,     EVP_sha1 },
        !            47:        { SSH_DIGEST_SHA256,    "SHA256",       32,     EVP_sha256 },
        !            48:        { SSH_DIGEST_SHA384,    "SHA384",       48,     EVP_sha384 },
        !            49:        { SSH_DIGEST_SHA512,    "SHA512",       64,     EVP_sha512 },
        !            50:        { -1,                   NULL,           0,      NULL },
        !            51: };
        !            52:
        !            53: static const struct ssh_digest *
        !            54: ssh_digest_by_alg(int alg)
        !            55: {
        !            56:        if (alg < 0 || alg >= SSH_DIGEST_MAX)
        !            57:                return NULL;
        !            58:        if (digests[alg].id != alg) /* sanity */
        !            59:                return NULL;
        !            60:        return &(digests[alg]);
        !            61: }
        !            62:
        !            63: size_t
        !            64: ssh_digest_bytes(int alg)
        !            65: {
        !            66:        const struct ssh_digest *digest = ssh_digest_by_alg(alg);
        !            67:
        !            68:        return digest == NULL ? 0 : digest->digest_len;
        !            69: }
        !            70:
        !            71: struct ssh_digest_ctx *
        !            72: ssh_digest_start(int alg)
        !            73: {
        !            74:        const struct ssh_digest *digest = ssh_digest_by_alg(alg);
        !            75:        struct ssh_digest_ctx *ret;
        !            76:
        !            77:        if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL))
        !            78:                return NULL;
        !            79:        ret->alg = alg;
        !            80:        EVP_MD_CTX_init(&ret->mdctx);
        !            81:        if (EVP_DigestInit_ex(&ret->mdctx, digest->mdfunc(), NULL) != 1) {
        !            82:                free(ret);
        !            83:                return NULL;
        !            84:        }
        !            85:        return ret;
        !            86: }
        !            87:
        !            88: int
        !            89: ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
        !            90: {
        !            91:        if (EVP_DigestUpdate(&ctx->mdctx, m, mlen) != 1)
        !            92:                return -1;
        !            93:        return 0;
        !            94: }
        !            95:
        !            96: int
        !            97: ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b)
        !            98: {
        !            99:        return ssh_digest_update(ctx, buffer_ptr(b), buffer_len(b));
        !           100: }
        !           101:
        !           102: int
        !           103: ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
        !           104: {
        !           105:        const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
        !           106:        u_int l = dlen;
        !           107:
        !           108:        if (dlen > UINT_MAX)
        !           109:                return -1;
        !           110:        if (dlen < digest->digest_len) /* No truncation allowed */
        !           111:                return -1;
        !           112:        if (EVP_DigestFinal_ex(&ctx->mdctx, d, &l) != 1)
        !           113:                return -1;
        !           114:        if (l != digest->digest_len) /* sanity */
        !           115:                return -1;
        !           116:        return 0;
        !           117: }
        !           118:
        !           119: void
        !           120: ssh_digest_free(struct ssh_digest_ctx *ctx)
        !           121: {
        !           122:        EVP_MD_CTX_cleanup(&ctx->mdctx);
        !           123:        memset(ctx, 0, sizeof(*ctx));
        !           124: }
        !           125:
        !           126: int
        !           127: ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
        !           128: {
        !           129:        struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
        !           130:
        !           131:        if (ctx == NULL)
        !           132:                return -1;
        !           133:        if (ssh_digest_update(ctx, m, mlen) != 0 ||
        !           134:            ssh_digest_final(ctx, d, dlen) != 0)
        !           135:                return -1;
        !           136:        ssh_digest_free(ctx);
        !           137:        return 0;
        !           138: }
        !           139:
        !           140: int
        !           141: ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen)
        !           142: {
        !           143:        return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen);
        !           144: }