CryptoPkg/Library/BaseCryptLib/Pk/CryptRsa.c

   1 /** @file
   2   RSA Asymmetric Cipher Wrapper Implementation over OpenSSL.
   3
   4 Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
   5 This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <Library/BaseLib.h>
  16 #include <Library/DebugLib.h>
  17 #include <Library/BaseMemoryLib.h>
  18
  19 #include <Library/BaseCryptLib.h>
  20 #include <openssl/rsa.h>
  21
  22
  23 /**
  24   Allocates and Initializes one RSA Context for subsequent use.
  25
  26   @return  Pointer to the RSA Context that has been initialized.
  27            If the allocations fails, RsaNew() returns NULL.
  28
  29 **/
  30 VOID *
  31 EFIAPI
  32 RsaNew (
  33   VOID
  34   )
  35 {
  36   //
  37   // Allocates & Initializes RSA Context by OpenSSL RSA_new()
  38   //
  39   return (VOID *)RSA_new ();
  40 }
  41
  42
  43 /**
  44   Release the specified RSA Context.
  45
  46   @param[in]  RsaContext  Pointer to the RSA context to be released.
  47
  48 **/
  49 VOID
  50 EFIAPI
  51 RsaFree (
  52   IN  VOID  *RsaContext
  53   )
  54 {
  55   //
  56   // Free OpenSSL RSA Context
  57   //
  58   RSA_free ((RSA *)RsaContext);
  59 }
  60
  61
  62 /**
  63   Sets the tag-designated RSA key component into the established RSA context from
  64   the user-specified nonnegative integer (octet string format represented in RSA
  65   PKCS#1).
  66
  67   If RsaContext is NULL, then ASSERT().
  68
  69   @param[in, out]  RsaContext  Pointer to RSA context being set.
  70   @param[in]       KeyTag      Tag of RSA key component being set.
  71   @param[in]       BigNumber   Pointer to octet integer buffer.
  72   @param[in]       BnLength    Length of big number buffer in bytes.
  73
  74   @return  TRUE   RSA key component was set successfully.
  75   @return  FALSE  Invalid RSA key component tag.
  76
  77 **/
  78 BOOLEAN
  79 EFIAPI
  80 RsaSetKey (
  81   IN OUT VOID         *RsaContext,
  82   IN     RSA_KEY_TAG  KeyTag,
  83   IN     CONST UINT8  *BigNumber,
  84   IN     UINTN        BnLength
  85   )
  86 {
  87   RSA  *RsaKey;
  88
  89   //
  90   // ASSERT if RsaContext is NULL
  91   //
  92   ASSERT (RsaContext != NULL);
  93
  94
  95   RsaKey = (RSA *)RsaContext;
  96   //
  97   // Set RSA Key Components by converting octet string to OpenSSL BN representation.
  98   // NOTE: For RSA public key (used in signature verification), only public components
  99   //       (N, e) are needed.
 100   //
 101   switch (KeyTag) {
 102
 103   //
 104   // RSA Public Modulus (N)
 105   //
 106   case RsaKeyN:
 107     if (RsaKey->n != NULL) {
 108       BN_free (RsaKey->n);
 109     }
 110     RsaKey->n = BN_bin2bn (BigNumber, (int)BnLength, RsaKey->n);
 111     break;
 112
 113   //
 114   // RSA Public Exponent (e)
 115   //
 116   case RsaKeyE:
 117     if (RsaKey->e != NULL) {
 118       BN_free (RsaKey->e);
 119     }
 120     RsaKey->e = BN_bin2bn (BigNumber, (int)BnLength, RsaKey->e);
 121     break;
 122
 123   //
 124   // RSA Private Exponent (d)
 125   //
 126   case RsaKeyD:
 127     if (RsaKey->d != NULL) {
 128       BN_free (RsaKey->d);
 129     }
 130     RsaKey->d = BN_bin2bn (BigNumber, (int)BnLength, RsaKey->d);
 131     break;
 132
 133   //
 134   // RSA Secret Prime Factor of Modulus (p)
 135   //
 136   case RsaKeyP:
 137     if (RsaKey->p != NULL) {
 138       BN_free (RsaKey->p);
 139     }
 140     RsaKey->p = BN_bin2bn (BigNumber, (int)BnLength, RsaKey->p);
 141     break;
 142
 143   //
 144   // RSA Secret Prime Factor of Modules (q)
 145   //
 146   case RsaKeyQ:
 147     if (RsaKey->q != NULL) {
 148       BN_free (RsaKey->q);
 149     }
 150     RsaKey->q = BN_bin2bn (BigNumber, (int)BnLength, RsaKey->q);
 151     break;
 152
 153   //
 154   // p's CRT Exponent (== d mod (p - 1))
 155   //
 156   case RsaKeyDp:
 157     if (RsaKey->dmp1 != NULL) {
 158       BN_free (RsaKey->dmp1);
 159     }
 160     RsaKey->dmp1 = BN_bin2bn (BigNumber, (int)BnLength, RsaKey->dmp1);
 161     break;
 162
 163   //
 164   // q's CRT Exponent (== d mod (q - 1))
 165   //
 166   case RsaKeyDq:
 167     if (RsaKey->dmq1 != NULL) {
 168       BN_free (RsaKey->dmq1);
 169     }
 170     RsaKey->dmq1 = BN_bin2bn (BigNumber, (int)BnLength, RsaKey->dmq1);
 171     break;
 172
 173   //
 174   // The CRT Coefficient (== 1/q mod p)
 175   //
 176   case RsaKeyQInv:
 177     if (RsaKey->iqmp != NULL) {
 178       BN_free (RsaKey->iqmp);
 179     }
 180     RsaKey->iqmp = BN_bin2bn (BigNumber, (int)BnLength, RsaKey->iqmp);
 181     break;
 182
 183   default:
 184     return FALSE;
 185   }
 186
 187   return TRUE;
 188 }
 189
 190
 191 /**
 192   Verifies the RSA-SSA signature with EMSA-PKCS1-v1_5 encoding scheme defined in
 193   RSA PKCS#1.
 194
 195   If RsaContext is NULL, then ASSERT().
 196   If MessageHash is NULL, then ASSERT().
 197   If Signature is NULL, then ASSERT().
 198   If HashLength is not equal to the size of MD5, SHA-1 or SHA-256 digest, then ASSERT().
 199
 200   @param[in]  RsaContext   Pointer to RSA context for signature verification.
 201   @param[in]  MessageHash  Pointer to octet message hash to be checked.
 202   @param[in]  HashLength   Length of the message hash in bytes.
 203   @param[in]  Signature    Pointer to RSA PKCS1-v1_5 signature to be verified.
 204   @param[in]  SigLength    Length of signature in bytes.
 205
 206   @return  TRUE   Valid signature encoded in PKCS1-v1_5.
 207   @return  FALSE  Invalid signature or invalid RSA context.
 208
 209 **/
 210 BOOLEAN
 211 EFIAPI
 212 RsaPkcs1Verify (
 213   IN  VOID         *RsaContext,
 214   IN  CONST UINT8  *MessageHash,
 215   IN  UINTN        HashLength,
 216   IN  UINT8        *Signature,
 217   IN  UINTN        SigLength
 218   )
 219 {
 220   INTN     Length;
 221
 222   //
 223   // ASSERT if RsaContext, MessageHash or Signature is NULL
 224   //
 225   ASSERT (RsaContext  != NULL);
 226   ASSERT (MessageHash != NULL);
 227   ASSERT (Signature   != NULL);
 228
 229   //
 230   // ASSERT if unsupported hash length:
 231   //    Only MD5, SHA-1 or SHA-256 digest size is supported
 232   //
 233   ASSERT ((HashLength == MD5_DIGEST_SIZE) || (HashLength == SHA1_DIGEST_SIZE) ||
 234           (HashLength == SHA256_DIGEST_SIZE));
 235
 236   //
 237   // RSA PKCS#1 Signature Decoding using OpenSSL RSA Decryption with Public Key
 238   //
 239   Length = RSA_public_decrypt (
 240              (int)SigLength,
 241              Signature,
 242              Signature,
 243              RsaContext,
 244              RSA_PKCS1_PADDING
 245              );
 246
 247   //
 248   // Invalid RSA Key or PKCS#1 Padding Checking Failed (if Length < 0)
 249   // NOTE: Length should be the addition of HashLength and some DER value.
 250   //       Ignore more strict length checking here.
 251   //
 252   if (Length < (INTN) HashLength) {
 253     return FALSE;
 254   }
 255
 256   //
 257   // Validate the MessageHash and Decoded Signature
 258   // NOTE: The decoded Signature should be the DER encoding of the DigestInfo value
 259   //       DigestInfo ::= SEQUENCE {
 260   //           digestAlgorithm AlgorithmIdentifier
 261   //           digest OCTET STRING
 262   //       }
 263   //       Then Memory Comparing should skip the DER value of the underlying SEQUENCE
 264   //       type and AlgorithmIdentifier.
 265   //
 266   if (CompareMem (MessageHash, Signature + Length - HashLength, HashLength) == 0) {
 267     //
 268     // Valid RSA PKCS#1 Signature
 269     //
 270     return TRUE;
 271   } else {
 272     //
 273     // Failed to verification
 274     //
 275     return FALSE;
 276   }
 277 }