CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaBasic.c

   1 /** @file
   2   RSA Asymmetric Cipher Wrapper Implementation over OpenSSL.
   3
   4   This file implements following APIs which provide basic capabilities for RSA:
   5   1) RsaNew
   6   2) RsaFree
   7   3) RsaSetKey
   8   4) RsaPkcs1Verify
   9
  10 Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
  11 This program and the accompanying materials
  12 are licensed and made available under the terms and conditions of the BSD License
  13 which accompanies this distribution.  The full text of the license may be found at
  14 http://opensource.org/licenses/bsd-license.php
  15
  16 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  17 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  18
  19 **/
  20
  21 #include "InternalCryptLib.h"
  22
  23 #include <openssl/rsa.h>
  24 #include <openssl/err.h>
  25
  26
  27 /**
  28   Allocates and initializes one RSA context for subsequent use.
  29
  30   @return  Pointer to the RSA context that has been initialized.
  31            If the allocations fails, RsaNew() returns NULL.
  32
  33 **/
  34 VOID *
  35 EFIAPI
  36 RsaNew (
  37   VOID
  38   )
  39 {
  40   //
  41   // Allocates & Initializes RSA Context by OpenSSL RSA_new()
  42   //
  43   return (VOID *)RSA_new ();
  44 }
  45
  46 /**
  47   Release the specified RSA context.
  48
  49   @param[in]  RsaContext  Pointer to the RSA context to be released.
  50
  51 **/
  52 VOID
  53 EFIAPI
  54 RsaFree (
  55   IN  VOID  *RsaContext
  56   )
  57 {
  58   //
  59   // Free OpenSSL RSA Context
  60   //
  61   RSA_free ((RSA *)RsaContext);
  62 }
  63
  64 /**
  65   Sets the tag-designated key component into the established RSA context.
  66
  67   This function sets the tag-designated RSA key component into the established
  68   RSA context from the user-specified non-negative integer (octet string format
  69   represented in RSA PKCS#1).
  70   If BigNumber is NULL, then the specified key componenet in RSA context is cleared.
  71
  72   If RsaContext is NULL, then return FALSE.
  73
  74   @param[in, out]  RsaContext  Pointer to RSA context being set.
  75   @param[in]       KeyTag      Tag of RSA key component being set.
  76   @param[in]       BigNumber   Pointer to octet integer buffer.
  77                                If NULL, then the specified key componenet in RSA
  78                                context is cleared.
  79   @param[in]       BnSize      Size of big number buffer in bytes.
  80                                If BigNumber is NULL, then it is ignored.
  81
  82   @retval  TRUE   RSA key component was set successfully.
  83   @retval  FALSE  Invalid RSA key component tag.
  84
  85 **/
  86 BOOLEAN
  87 EFIAPI
  88 RsaSetKey (
  89   IN OUT  VOID         *RsaContext,
  90   IN      RSA_KEY_TAG  KeyTag,
  91   IN      CONST UINT8  *BigNumber,
  92   IN      UINTN        BnSize
  93   )
  94 {
  95   RSA  *RsaKey;
  96
  97   //
  98   // Check input parameters.
  99   //
 100   if (RsaContext == NULL) {
 101     return FALSE;
 102   }
 103
 104   RsaKey = (RSA *)RsaContext;
 105   //
 106   // Set RSA Key Components by converting octet string to OpenSSL BN representation.
 107   // NOTE: For RSA public key (used in signature verification), only public components
 108   //       (N, e) are needed.
 109   //
 110   switch (KeyTag) {
 111
 112   //
 113   // RSA Public Modulus (N)
 114   //
 115   case RsaKeyN:
 116     if (RsaKey->n != NULL) {
 117       BN_free (RsaKey->n);
 118     }
 119     RsaKey->n = NULL;
 120     if (BigNumber == NULL) {
 121       break;
 122     }
 123     RsaKey->n = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->n);
 124     break;
 125
 126   //
 127   // RSA Public Exponent (e)
 128   //
 129   case RsaKeyE:
 130     if (RsaKey->e != NULL) {
 131       BN_free (RsaKey->e);
 132     }
 133     RsaKey->e = NULL;
 134     if (BigNumber == NULL) {
 135       break;
 136     }
 137     RsaKey->e = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->e);
 138     break;
 139
 140   //
 141   // RSA Private Exponent (d)
 142   //
 143   case RsaKeyD:
 144     if (RsaKey->d != NULL) {
 145       BN_free (RsaKey->d);
 146     }
 147     RsaKey->d = NULL;
 148     if (BigNumber == NULL) {
 149       break;
 150     }
 151     RsaKey->d = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->d);
 152     break;
 153
 154   //
 155   // RSA Secret Prime Factor of Modulus (p)
 156   //
 157   case RsaKeyP:
 158     if (RsaKey->p != NULL) {
 159       BN_free (RsaKey->p);
 160     }
 161     RsaKey->p = NULL;
 162     if (BigNumber == NULL) {
 163       break;
 164     }
 165     RsaKey->p = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->p);
 166     break;
 167
 168   //
 169   // RSA Secret Prime Factor of Modules (q)
 170   //
 171   case RsaKeyQ:
 172     if (RsaKey->q != NULL) {
 173       BN_free (RsaKey->q);
 174     }
 175     RsaKey->q = NULL;
 176     if (BigNumber == NULL) {
 177       break;
 178     }
 179     RsaKey->q = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->q);
 180     break;
 181
 182   //
 183   // p's CRT Exponent (== d mod (p - 1))
 184   //
 185   case RsaKeyDp:
 186     if (RsaKey->dmp1 != NULL) {
 187       BN_free (RsaKey->dmp1);
 188     }
 189     RsaKey->dmp1 = NULL;
 190     if (BigNumber == NULL) {
 191       break;
 192     }
 193     RsaKey->dmp1 = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->dmp1);
 194     break;
 195
 196   //
 197   // q's CRT Exponent (== d mod (q - 1))
 198   //
 199   case RsaKeyDq:
 200     if (RsaKey->dmq1 != NULL) {
 201       BN_free (RsaKey->dmq1);
 202     }
 203     RsaKey->dmq1 = NULL;
 204     if (BigNumber == NULL) {
 205       break;
 206     }
 207     RsaKey->dmq1 = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->dmq1);
 208     break;
 209
 210   //
 211   // The CRT Coefficient (== 1/q mod p)
 212   //
 213   case RsaKeyQInv:
 214     if (RsaKey->iqmp != NULL) {
 215       BN_free (RsaKey->iqmp);
 216     }
 217     RsaKey->iqmp = NULL;
 218     if (BigNumber == NULL) {
 219       break;
 220     }
 221     RsaKey->iqmp = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->iqmp);
 222     break;
 223
 224   default:
 225     return FALSE;
 226   }
 227
 228   return TRUE;
 229 }
 230
 231 /**
 232   Verifies the RSA-SSA signature with EMSA-PKCS1-v1_5 encoding scheme defined in
 233   RSA PKCS#1.
 234
 235   If RsaContext is NULL, then return FALSE.
 236   If MessageHash is NULL, then return FALSE.
 237   If Signature is NULL, then return FALSE.
 238   If HashSize is not equal to the size of MD5, SHA-1 or SHA-256 digest, then return FALSE.
 239
 240   @param[in]  RsaContext   Pointer to RSA context for signature verification.
 241   @param[in]  MessageHash  Pointer to octet message hash to be checked.
 242   @param[in]  HashSize     Size of the message hash in bytes.
 243   @param[in]  Signature    Pointer to RSA PKCS1-v1_5 signature to be verified.
 244   @param[in]  SigSize      Size of signature in bytes.
 245
 246   @retval  TRUE   Valid signature encoded in PKCS1-v1_5.
 247   @retval  FALSE  Invalid signature or invalid RSA context.
 248
 249 **/
 250 BOOLEAN
 251 EFIAPI
 252 RsaPkcs1Verify (
 253   IN  VOID         *RsaContext,
 254   IN  CONST UINT8  *MessageHash,
 255   IN  UINTN        HashSize,
 256   IN  UINT8        *Signature,
 257   IN  UINTN        SigSize
 258   )
 259 {
 260   INTN     Length;
 261
 262   //
 263   // Check input parameters.
 264   //
 265   if (RsaContext == NULL || MessageHash == NULL || Signature == NULL) {
 266     return FALSE;
 267   }
 268
 269
 270   //
 271   // Check for unsupported hash size:
 272   //    Only MD5, SHA-1 or SHA-256 digest size is supported
 273   //
 274   if (HashSize != MD5_DIGEST_SIZE && HashSize != SHA1_DIGEST_SIZE && HashSize != SHA256_DIGEST_SIZE) {
 275     return FALSE;
 276   }
 277
 278   //
 279   // RSA PKCS#1 Signature Decoding using OpenSSL RSA Decryption with Public Key
 280   //
 281   Length = RSA_public_decrypt (
 282              (UINT32) SigSize,
 283              Signature,
 284              Signature,
 285              RsaContext,
 286              RSA_PKCS1_PADDING
 287              );
 288
 289   //
 290   // Invalid RSA Key or PKCS#1 Padding Checking Failed (if Length < 0)
 291   // NOTE: Length should be the addition of HashSize and some DER value.
 292   //       Ignore more strict length checking here.
 293   //
 294   if (Length < (INTN) HashSize) {
 295     return FALSE;
 296   }
 297
 298   //
 299   // Validate the MessageHash and Decoded Signature
 300   // NOTE: The decoded Signature should be the DER encoding of the DigestInfo value
 301   //       DigestInfo ::= SEQUENCE {
 302   //           digestAlgorithm AlgorithmIdentifier
 303   //           digest OCTET STRING
 304   //       }
 305   //       Then Memory Comparing should skip the DER value of the underlying SEQUENCE
 306   //       type and AlgorithmIdentifier.
 307   //
 308   if (CompareMem (MessageHash, Signature + Length - HashSize, HashSize) == 0) {
 309     //
 310     // Valid RSA PKCS#1 Signature
 311     //
 312     return TRUE;
 313   } else {
 314     //
 315     // Failed to verification
 316     //
 317     return FALSE;
 318   }
 319 }