diff options
Diffstat (limited to 'crypto/openssh/digest-openssl.c')
| -rw-r--r-- | crypto/openssh/digest-openssl.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/crypto/openssh/digest-openssl.c b/crypto/openssh/digest-openssl.c new file mode 100644 index 0000000..863d37d --- /dev/null +++ b/crypto/openssh/digest-openssl.c @@ -0,0 +1,166 @@ +/* $OpenBSD: digest-openssl.c,v 1.2 2014/02/02 03:44:31 djm Exp $ */ +/* + * Copyright (c) 2013 Damien Miller <djm@mindrot.org> + * + * 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" + +#include <sys/types.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> + +#include <openssl/evp.h> + +#include "openbsd-compat/openssl-compat.h" + +#include "buffer.h" +#include "digest.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_RIPEMD160, "RIPEMD160", 20, EVP_ripemd160 }, + { SSH_DIGEST_SHA1, "SHA1", 20, EVP_sha1 }, +#ifdef HAVE_EVP_SHA256 /* XXX replace with local if missing */ + { SSH_DIGEST_SHA256, "SHA256", 32, EVP_sha256 }, + { SSH_DIGEST_SHA384, "SHA384", 48, EVP_sha384 }, + { SSH_DIGEST_SHA512, "SHA512", 64, EVP_sha512 }, +#endif + { -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]); +} + +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; + + if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL)) + return NULL; + ret->alg = alg; + EVP_MD_CTX_init(&ret->mdctx); + if (EVP_DigestInit_ex(&ret->mdctx, digest->mdfunc(), NULL) != 1) { + free(ret); + return NULL; + } + return ret; +} + +int +ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to) +{ + /* we have bcopy-style order while openssl has memcpy-style */ + if (!EVP_MD_CTX_copy_ex(&to->mdctx, &from->mdctx)) + return -1; + 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 -1; + return 0; +} + +int +ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b) +{ + return ssh_digest_update(ctx, buffer_ptr(b), buffer_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 (dlen > UINT_MAX) + return -1; + if (dlen < digest->digest_len) /* No truncation allowed */ + return -1; + if (EVP_DigestFinal_ex(&ctx->mdctx, d, &l) != 1) + return -1; + if (l != digest->digest_len) /* sanity */ + return -1; + return 0; +} + +void +ssh_digest_free(struct ssh_digest_ctx *ctx) +{ + if (ctx != NULL) { + EVP_MD_CTX_cleanup(&ctx->mdctx); + explicit_bzero(ctx, sizeof(*ctx)); + free(ctx); + } +} + +int +ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen) +{ + struct ssh_digest_ctx *ctx = ssh_digest_start(alg); + + if (ctx == NULL) + return -1; + if (ssh_digest_update(ctx, m, mlen) != 0 || + ssh_digest_final(ctx, d, dlen) != 0) + return -1; + ssh_digest_free(ctx); + return 0; +} + +int +ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen) +{ + return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen); +} |
