[331] | 1 | /*
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| 2 | * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/evp.h>
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| 13 | #include <openssl/objects.h>
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| 14 | #include <openssl/x509.h>
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| 15 | #include "internal/evp_int.h"
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| 16 | #include "evp_locl.h"
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| 17 |
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| 18 | static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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| 19 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
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| 20 | int ver)
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| 21 | {
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| 22 | if (ctx->pctx == NULL)
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| 23 | ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
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| 24 | if (ctx->pctx == NULL)
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| 25 | return 0;
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| 26 |
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| 27 | if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
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| 28 |
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| 29 | if (type == NULL) {
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| 30 | int def_nid;
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| 31 | if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
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| 32 | type = EVP_get_digestbynid(def_nid);
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| 33 | }
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| 34 |
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| 35 | if (type == NULL) {
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| 36 | EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
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| 37 | return 0;
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| 38 | }
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| 39 | }
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| 40 |
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| 41 | if (ver) {
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| 42 | if (ctx->pctx->pmeth->verifyctx_init) {
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| 43 | if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
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| 44 | return 0;
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| 45 | ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
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| 46 | } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
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| 47 | return 0;
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| 48 | } else {
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| 49 | if (ctx->pctx->pmeth->signctx_init) {
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| 50 | if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
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| 51 | return 0;
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| 52 | ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
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| 53 | } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
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| 54 | return 0;
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| 55 | }
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| 56 | if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
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| 57 | return 0;
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| 58 | if (pctx)
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| 59 | *pctx = ctx->pctx;
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| 60 | if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
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| 61 | return 1;
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| 62 | if (!EVP_DigestInit_ex(ctx, type, e))
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| 63 | return 0;
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| 64 | return 1;
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| 65 | }
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| 66 |
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| 67 | int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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| 68 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
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| 69 | {
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| 70 | return do_sigver_init(ctx, pctx, type, e, pkey, 0);
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| 71 | }
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| 72 |
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| 73 | int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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| 74 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
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| 75 | {
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| 76 | return do_sigver_init(ctx, pctx, type, e, pkey, 1);
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| 77 | }
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| 78 |
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| 79 | int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
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| 80 | size_t *siglen)
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| 81 | {
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| 82 | int sctx = 0, r = 0;
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| 83 | EVP_PKEY_CTX *pctx = ctx->pctx;
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| 84 | if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
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| 85 | if (!sigret)
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| 86 | return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
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| 87 | if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
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| 88 | r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
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| 89 | else {
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| 90 | EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(ctx->pctx);
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| 91 | if (!dctx)
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| 92 | return 0;
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| 93 | r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
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| 94 | EVP_PKEY_CTX_free(dctx);
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| 95 | }
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| 96 | return r;
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| 97 | }
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| 98 | if (pctx->pmeth->signctx)
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| 99 | sctx = 1;
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| 100 | else
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| 101 | sctx = 0;
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| 102 | if (sigret) {
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| 103 | unsigned char md[EVP_MAX_MD_SIZE];
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| 104 | unsigned int mdlen = 0;
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| 105 | if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
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| 106 | if (sctx)
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| 107 | r = ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx);
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| 108 | else
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| 109 | r = EVP_DigestFinal_ex(ctx, md, &mdlen);
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| 110 | } else {
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| 111 | EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
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| 112 | if (tmp_ctx == NULL || !EVP_MD_CTX_copy_ex(tmp_ctx, ctx))
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| 113 | return 0;
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| 114 | if (sctx)
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| 115 | r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
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| 116 | sigret, siglen, tmp_ctx);
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| 117 | else
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| 118 | r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
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| 119 | EVP_MD_CTX_free(tmp_ctx);
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| 120 | }
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| 121 | if (sctx || !r)
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| 122 | return r;
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| 123 | if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
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| 124 | return 0;
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| 125 | } else {
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| 126 | if (sctx) {
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| 127 | if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
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| 128 | return 0;
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| 129 | } else {
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| 130 | int s = EVP_MD_size(ctx->digest);
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| 131 | if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
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| 132 | return 0;
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| 133 | }
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| 134 | }
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| 135 | return 1;
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| 136 | }
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| 137 |
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| 138 | int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
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| 139 | size_t siglen)
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| 140 | {
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| 141 | unsigned char md[EVP_MAX_MD_SIZE];
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| 142 | int r = 0;
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| 143 | unsigned int mdlen = 0;
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| 144 | int vctx = 0;
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| 145 |
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| 146 | if (ctx->pctx->pmeth->verifyctx)
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| 147 | vctx = 1;
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| 148 | else
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| 149 | vctx = 0;
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| 150 | if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
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| 151 | if (vctx) {
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| 152 | r = ctx->pctx->pmeth->verifyctx(ctx->pctx, sig, siglen, ctx);
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| 153 | } else
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| 154 | r = EVP_DigestFinal_ex(ctx, md, &mdlen);
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| 155 | } else {
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| 156 | EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
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| 157 | if (tmp_ctx == NULL || !EVP_MD_CTX_copy_ex(tmp_ctx, ctx))
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| 158 | return -1;
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| 159 | if (vctx) {
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| 160 | r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
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| 161 | sig, siglen, tmp_ctx);
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| 162 | } else
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| 163 | r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
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| 164 | EVP_MD_CTX_free(tmp_ctx);
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| 165 | }
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| 166 | if (vctx || !r)
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| 167 | return r;
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| 168 | return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
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| 169 | }
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