| 1 | /*
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| 2 | * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (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 "crypto/evp.h"
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| 16 |
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| 17 | int EVP_VerifyFinal_ex(EVP_MD_CTX *ctx, const unsigned char *sigbuf,
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| 18 | unsigned int siglen, EVP_PKEY *pkey, OSSL_LIB_CTX *libctx,
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| 19 | const char *propq)
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| 20 | {
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| 21 | unsigned char m[EVP_MAX_MD_SIZE];
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| 22 | unsigned int m_len = 0;
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| 23 | int i = 0;
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| 24 | EVP_PKEY_CTX *pkctx = NULL;
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| 25 |
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| 26 | if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_FINALISE)) {
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| 27 | if (!EVP_DigestFinal_ex(ctx, m, &m_len))
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| 28 | goto err;
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| 29 | } else {
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| 30 | int rv = 0;
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| 31 | EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
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| 32 |
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| 33 | if (tmp_ctx == NULL) {
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| 34 | ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
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| 35 | return 0;
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| 36 | }
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| 37 | rv = EVP_MD_CTX_copy_ex(tmp_ctx, ctx);
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| 38 | if (rv)
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| 39 | rv = EVP_DigestFinal_ex(tmp_ctx, m, &m_len);
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| 40 | else
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| 41 | rv = EVP_DigestFinal_ex(ctx, m, &m_len);
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| 42 | EVP_MD_CTX_free(tmp_ctx);
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| 43 | if (!rv)
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| 44 | return 0;
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| 45 | }
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| 46 |
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| 47 | i = -1;
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| 48 | pkctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq);
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| 49 | if (pkctx == NULL)
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| 50 | goto err;
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| 51 | if (EVP_PKEY_verify_init(pkctx) <= 0)
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| 52 | goto err;
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| 53 | if (EVP_PKEY_CTX_set_signature_md(pkctx, EVP_MD_CTX_get0_md(ctx)) <= 0)
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| 54 | goto err;
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| 55 | i = EVP_PKEY_verify(pkctx, sigbuf, siglen, m, m_len);
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| 56 | err:
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| 57 | EVP_PKEY_CTX_free(pkctx);
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| 58 | return i;
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| 59 | }
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| 60 |
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| 61 | int EVP_VerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sigbuf,
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| 62 | unsigned int siglen, EVP_PKEY *pkey)
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| 63 | {
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| 64 | return EVP_VerifyFinal_ex(ctx, sigbuf, siglen, pkey, NULL, NULL);
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| 65 | }
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