crypto/rsa/rsa_saos.c

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * RSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <stdio.h>
  17 #include "internal/cryptlib.h"
  18 #include <openssl/bn.h>
  19 #include <openssl/rsa.h>
  20 #include <openssl/objects.h>
  21 #include <openssl/x509.h>
  22
  23 int RSA_sign_ASN1_OCTET_STRING(int type,
  24                                const unsigned char *m, unsigned int m_len,
  25                                unsigned char *sigret, unsigned int *siglen,
  26                                RSA *rsa)
  27 {
  28     ASN1_OCTET_STRING sig;
  29     int i, j, ret = 1;
  30     unsigned char *p, *s;
  31
  32     sig.type = V_ASN1_OCTET_STRING;
  33     sig.length = m_len;
  34     sig.data = (unsigned char *)m;
  35
  36     i = i2d_ASN1_OCTET_STRING(&sig, NULL);
  37     j = RSA_size(rsa);
  38     if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
  39         ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
  40         return 0;
  41     }
  42     s = OPENSSL_malloc((unsigned int)j + 1);
  43     if (s == NULL)
  44         return 0;
  45     p = s;
  46     i2d_ASN1_OCTET_STRING(&sig, &p);
  47     i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
  48     if (i <= 0)
  49         ret = 0;
  50     else
  51         *siglen = i;
  52
  53     OPENSSL_clear_free(s, (unsigned int)j + 1);
  54     return ret;
  55 }
  56
  57 int RSA_verify_ASN1_OCTET_STRING(int dtype,
  58                                  const unsigned char *m,
  59                                  unsigned int m_len, unsigned char *sigbuf,
  60                                  unsigned int siglen, RSA *rsa)
  61 {
  62     int i, ret = 0;
  63     unsigned char *s;
  64     const unsigned char *p;
  65     ASN1_OCTET_STRING *sig = NULL;
  66
  67     if (siglen != (unsigned int)RSA_size(rsa)) {
  68         ERR_raise(ERR_LIB_RSA, RSA_R_WRONG_SIGNATURE_LENGTH);
  69         return 0;
  70     }
  71
  72     s = OPENSSL_malloc((unsigned int)siglen);
  73     if (s == NULL)
  74         goto err;
  75     i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
  76
  77     if (i <= 0)
  78         goto err;
  79
  80     p = s;
  81     sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
  82     if (sig == NULL)
  83         goto err;
  84
  85     if (((unsigned int)sig->length != m_len) ||
  86         (memcmp(m, sig->data, m_len) != 0)) {
  87         ERR_raise(ERR_LIB_RSA, RSA_R_BAD_SIGNATURE);
  88     } else {
  89         ret = 1;
  90     }
  91  err:
  92     ASN1_OCTET_STRING_free(sig);
  93     OPENSSL_clear_free(s, (unsigned int)siglen);
  94     return ret;
  95 }