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/* $OpenBSD: digest-openssl.c,v 1.2 2014/02/02 03:44:31 djm Exp $ */ |
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/* |
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* Copyright (c) 2013 Damien Miller <djm@mindrot.org> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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|
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#include "includes.h" |
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|
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#include <sys/types.h> |
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#include <limits.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include <openssl/evp.h> |
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|
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#include "openbsd-compat/openssl-compat.h" |
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|
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#include "buffer.h" |
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#include "digest.h" |
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|
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struct ssh_digest_ctx { |
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int alg; |
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EVP_MD_CTX mdctx; |
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}; |
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|
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struct ssh_digest { |
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int id; |
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const char *name; |
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size_t digest_len; |
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const EVP_MD *(*mdfunc)(void); |
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}; |
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|
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/* NB. Indexed directly by algorithm number */ |
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const struct ssh_digest digests[] = { |
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{ SSH_DIGEST_MD5, "MD5", 16, EVP_md5 }, |
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{ SSH_DIGEST_RIPEMD160, "RIPEMD160", 20, EVP_ripemd160 }, |
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{ SSH_DIGEST_SHA1, "SHA1", 20, EVP_sha1 }, |
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#ifdef HAVE_EVP_SHA256 /* XXX replace with local if missing */ |
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{ SSH_DIGEST_SHA256, "SHA256", 32, EVP_sha256 }, |
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{ SSH_DIGEST_SHA384, "SHA384", 48, EVP_sha384 }, |
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{ SSH_DIGEST_SHA512, "SHA512", 64, EVP_sha512 }, |
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#endif |
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{ -1, NULL, 0, NULL }, |
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}; |
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|
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static const struct ssh_digest * |
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ssh_digest_by_alg(int alg) |
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{ |
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if (alg < 0 || alg >= SSH_DIGEST_MAX) |
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return NULL; |
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if (digests[alg].id != alg) /* sanity */ |
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return NULL; |
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return &(digests[alg]); |
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} |
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|
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size_t |
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ssh_digest_bytes(int alg) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
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|
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return digest == NULL ? 0 : digest->digest_len; |
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} |
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|
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size_t |
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ssh_digest_blocksize(struct ssh_digest_ctx *ctx) |
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{ |
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return EVP_MD_CTX_block_size(&ctx->mdctx); |
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} |
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|
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struct ssh_digest_ctx * |
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ssh_digest_start(int alg) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
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struct ssh_digest_ctx *ret; |
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|
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if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL)) |
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return NULL; |
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ret->alg = alg; |
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EVP_MD_CTX_init(&ret->mdctx); |
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if (EVP_DigestInit_ex(&ret->mdctx, digest->mdfunc(), NULL) != 1) { |
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free(ret); |
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return NULL; |
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} |
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return ret; |
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} |
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|
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int |
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ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to) |
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{ |
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/* we have bcopy-style order while openssl has memcpy-style */ |
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if (!EVP_MD_CTX_copy_ex(&to->mdctx, &from->mdctx)) |
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return -1; |
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return 0; |
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} |
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|
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int |
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ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen) |
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{ |
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if (EVP_DigestUpdate(&ctx->mdctx, m, mlen) != 1) |
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return -1; |
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return 0; |
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} |
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|
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int |
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ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b) |
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{ |
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return ssh_digest_update(ctx, buffer_ptr(b), buffer_len(b)); |
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} |
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|
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int |
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ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen) |
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{ |
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const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
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u_int l = dlen; |
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|
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if (dlen > UINT_MAX) |
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return -1; |
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if (dlen < digest->digest_len) /* No truncation allowed */ |
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return -1; |
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if (EVP_DigestFinal_ex(&ctx->mdctx, d, &l) != 1) |
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return -1; |
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if (l != digest->digest_len) /* sanity */ |
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return -1; |
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return 0; |
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} |
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|
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void |
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ssh_digest_free(struct ssh_digest_ctx *ctx) |
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{ |
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if (ctx != NULL) { |
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EVP_MD_CTX_cleanup(&ctx->mdctx); |
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explicit_bzero(ctx, sizeof(*ctx)); |
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free(ctx); |
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} |
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} |
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|
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int |
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ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen) |
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{ |
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struct ssh_digest_ctx *ctx = ssh_digest_start(alg); |
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|
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if (ctx == NULL) |
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return -1; |
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if (ssh_digest_update(ctx, m, mlen) != 0 || |
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ssh_digest_final(ctx, d, dlen) != 0) |
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return -1; |
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ssh_digest_free(ctx); |
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return 0; |
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} |
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|
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int |
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ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen) |
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{ |
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return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen); |
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} |
