/* $NetBSD: digest-openssl.c,v 1.8.2.1 2023/12/25 12:31:04 martin Exp $ */ /* $OpenBSD: digest-openssl.c,v 1.9 2020/10/29 02:52:43 djm Exp $ */ /* * Copyright (c) 2013 Damien Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "includes.h" __RCSID("$NetBSD: digest-openssl.c,v 1.8.2.1 2023/12/25 12:31:04 martin Exp $"); #include #include #include #include #include #include "sshbuf.h" #include "digest.h" #include "ssherr.h" struct ssh_digest_ctx { int alg; EVP_MD_CTX *mdctx; }; struct ssh_digest { int id; const char *name; size_t digest_len; const EVP_MD *(*mdfunc)(void); }; /* NB. Indexed directly by algorithm number */ const struct ssh_digest digests[] = { { SSH_DIGEST_MD5, "MD5", 16, EVP_md5 }, { SSH_DIGEST_SHA1, "SHA1", 20, EVP_sha1 }, { SSH_DIGEST_SHA256, "SHA256", 32, EVP_sha256 }, { SSH_DIGEST_SHA384, "SHA384", 48, EVP_sha384 }, { SSH_DIGEST_SHA512, "SHA512", 64, EVP_sha512 }, { -1, NULL, 0, NULL }, }; static const struct ssh_digest * ssh_digest_by_alg(int alg) { if (alg < 0 || alg >= SSH_DIGEST_MAX) return NULL; if (digests[alg].id != alg) /* sanity */ return NULL; return &(digests[alg]); } int ssh_digest_alg_by_name(const char *name) { int alg; for (alg = 0; digests[alg].id != -1; alg++) { if (strcasecmp(name, digests[alg].name) == 0) return digests[alg].id; } return -1; } const char * ssh_digest_alg_name(int alg) { const struct ssh_digest *digest = ssh_digest_by_alg(alg); return digest == NULL ? NULL : digest->name; } size_t ssh_digest_bytes(int alg) { const struct ssh_digest *digest = ssh_digest_by_alg(alg); return digest == NULL ? 0 : digest->digest_len; } size_t ssh_digest_blocksize(struct ssh_digest_ctx *ctx) { return EVP_MD_CTX_block_size(ctx->mdctx); } struct ssh_digest_ctx * ssh_digest_start(int alg) { const struct ssh_digest *digest = ssh_digest_by_alg(alg); struct ssh_digest_ctx *ret = NULL; if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL)) return NULL; ret->alg = alg; if ((ret->mdctx = EVP_MD_CTX_new()) == NULL) { free(ret); return NULL; } if (EVP_DigestInit_ex(ret->mdctx, digest->mdfunc(), NULL) != 1) { ssh_digest_free(ret); return NULL; } return ret; } int ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to) { if (from->alg != to->alg) return SSH_ERR_INVALID_ARGUMENT; /* we have bcopy-style order while openssl has memcpy-style */ if (!EVP_MD_CTX_copy_ex(to->mdctx, from->mdctx)) return SSH_ERR_LIBCRYPTO_ERROR; return 0; } int ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen) { if (EVP_DigestUpdate(ctx->mdctx, m, mlen) != 1) return SSH_ERR_LIBCRYPTO_ERROR; return 0; } int ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b) { return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b)); } int ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen) { const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); u_int l = dlen; if (digest == NULL || dlen > UINT_MAX) return SSH_ERR_INVALID_ARGUMENT; if (dlen < digest->digest_len) /* No truncation allowed */ return SSH_ERR_INVALID_ARGUMENT; if (EVP_DigestFinal_ex(ctx->mdctx, d, &l) != 1) return SSH_ERR_LIBCRYPTO_ERROR; if (l != digest->digest_len) /* sanity */ return SSH_ERR_INTERNAL_ERROR; return 0; } void ssh_digest_free(struct ssh_digest_ctx *ctx) { if (ctx == NULL) return; EVP_MD_CTX_free(ctx->mdctx); freezero(ctx, sizeof(*ctx)); } int ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen) { const struct ssh_digest *digest = ssh_digest_by_alg(alg); u_int mdlen; if (digest == NULL) return SSH_ERR_INVALID_ARGUMENT; if (dlen > UINT_MAX) return SSH_ERR_INVALID_ARGUMENT; if (dlen < digest->digest_len) return SSH_ERR_INVALID_ARGUMENT; mdlen = dlen; if (!EVP_Digest(m, mlen, d, &mdlen, digest->mdfunc(), NULL)) return SSH_ERR_LIBCRYPTO_ERROR; return 0; } int ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen) { return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen); }