| 1 | /*
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| 2 | * Copyright 1995-2017 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/bn.h>
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| 13 | #include <openssl/rsa.h>
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| 14 | #include <openssl/objects.h>
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| 15 | #include <openssl/x509.h>
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| 16 |
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| 17 | int RSA_sign_ASN1_OCTET_STRING(int type,
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| 18 | const unsigned char *m, unsigned int m_len,
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| 19 | unsigned char *sigret, unsigned int *siglen,
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| 20 | RSA *rsa)
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| 21 | {
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| 22 | ASN1_OCTET_STRING sig;
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| 23 | int i, j, ret = 1;
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| 24 | unsigned char *p, *s;
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| 25 |
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| 26 | sig.type = V_ASN1_OCTET_STRING;
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| 27 | sig.length = m_len;
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| 28 | sig.data = (unsigned char *)m;
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| 29 |
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| 30 | i = i2d_ASN1_OCTET_STRING(&sig, NULL);
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| 31 | j = RSA_size(rsa);
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| 32 | if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
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| 33 | RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,
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| 34 | RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
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| 35 | return 0;
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| 36 | }
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| 37 | s = OPENSSL_malloc((unsigned int)j + 1);
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| 38 | if (s == NULL) {
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| 39 | RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
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| 40 | return 0;
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| 41 | }
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| 42 | p = s;
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| 43 | i2d_ASN1_OCTET_STRING(&sig, &p);
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| 44 | i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
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| 45 | if (i <= 0)
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| 46 | ret = 0;
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| 47 | else
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| 48 | *siglen = i;
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| 49 |
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| 50 | OPENSSL_clear_free(s, (unsigned int)j + 1);
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| 51 | return ret;
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| 52 | }
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| 53 |
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| 54 | int RSA_verify_ASN1_OCTET_STRING(int dtype,
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| 55 | const unsigned char *m,
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| 56 | unsigned int m_len, unsigned char *sigbuf,
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| 57 | unsigned int siglen, RSA *rsa)
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| 58 | {
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| 59 | int i, ret = 0;
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| 60 | unsigned char *s;
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| 61 | const unsigned char *p;
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| 62 | ASN1_OCTET_STRING *sig = NULL;
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| 63 |
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| 64 | if (siglen != (unsigned int)RSA_size(rsa)) {
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| 65 | RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,
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| 66 | RSA_R_WRONG_SIGNATURE_LENGTH);
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| 67 | return 0;
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| 68 | }
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| 69 |
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| 70 | s = OPENSSL_malloc((unsigned int)siglen);
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| 71 | if (s == NULL) {
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| 72 | RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
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| 73 | goto err;
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| 74 | }
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| 75 | i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
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| 76 |
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| 77 | if (i <= 0)
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| 78 | goto err;
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| 79 |
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| 80 | p = s;
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| 81 | sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
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| 82 | if (sig == NULL)
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| 83 | goto err;
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| 84 |
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| 85 | if (((unsigned int)sig->length != m_len) ||
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| 86 | (memcmp(m, sig->data, m_len) != 0)) {
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| 87 | RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, RSA_R_BAD_SIGNATURE);
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| 88 | } else {
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| 89 | ret = 1;
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| 90 | }
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| 91 | err:
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| 92 | ASN1_OCTET_STRING_free(sig);
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| 93 | OPENSSL_clear_free(s, (unsigned int)siglen);
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| 94 | return ret;
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| 95 | }
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