OSX/libsecurity_apple_csp/lib/FEESignatureObject.cpp

   1 /*
   2  * Copyright (c) 2000-2001,2011-2012,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /*
  20  * FEESignatureObject.cpp - implementations of FEE-style raw sign/verify classes
  21  *
  22  */
  23
  24 #ifdef  CRYPTKIT_CSP_ENABLE
  25
  26 #include "FEESignatureObject.h"
  27 #include <security_cryptkit/feePublicKey.h>
  28 #include <security_cryptkit/feeDigitalSignature.h>
  29 #include <security_cryptkit/falloc.h>
  30 #include <stdexcept>
  31 #include <security_utilities/simulatecrash_assert.h>
  32 #include <security_utilities/debugging.h>
  33
  34 #define feeSigObjDebug(args...)         secinfo("feeSig", ##args)
  35
  36 CryptKit::FEESigner::~FEESigner()
  37 {
  38         if(mWeMallocdFeeKey) {
  39                 assert(mFeeKey != NULL);
  40                 feePubKeyFree(mFeeKey);
  41         }
  42 }
  43
  44 /*
  45  * padding from context
  46  */
  47 void CryptKit::FEESigner::sigFormatFromContext(
  48                                          const Context  &context)
  49 {
  50     CSSM_PADDING padding = context.getInt(CSSM_ATTRIBUTE_PADDING);
  51     switch(padding) {
  52         case CSSM_PADDING_SIGRAW:
  53             mSigFormat=FSF_RAW;
  54             break;
  55         default:
  56             mSigFormat=FSF_DER;
  57     }
  58 }
  59 /*
  60  * obtain key from context, validate, convert to native FEE key
  61  */
  62 void CryptKit::FEESigner::keyFromContext(
  63         const Context   &context)
  64 {
  65         if(initFlag() && (mFeeKey != NULL)) {
  66                 /* reusing context, OK */
  67                 return;
  68         }
  69
  70         CSSM_KEYCLASS   keyClass;
  71         CSSM_KEYUSE             keyUse;
  72         if(isSigning()) {
  73                 /* signing with private key */
  74                 keyClass = CSSM_KEYCLASS_PRIVATE_KEY;
  75                 keyUse   = CSSM_KEYUSE_SIGN;
  76         }
  77         else {
  78                 /* verifying with public key */
  79                 keyClass = CSSM_KEYCLASS_PUBLIC_KEY;
  80                 keyUse   = CSSM_KEYUSE_VERIFY;
  81         }
  82         if(mFeeKey == NULL) {
  83                 mFeeKey = contextToFeeKey(context,
  84                         mSession,
  85                         CSSM_ATTRIBUTE_KEY,
  86                         keyClass,
  87                         keyUse,
  88                         mWeMallocdFeeKey);
  89         }
  90 }
  91
  92 /* reusable init */
  93 void CryptKit::FEESigner::signerInit(
  94         const Context   &context,
  95         bool                    isSigning)
  96 {
  97         setIsSigning(isSigning);
  98         keyFromContext(context);
  99     sigFormatFromContext(context);
 100         setInitFlag(true);
 101 }
 102
 103 /*
 104  * Note that, unlike the implementation in security_cryptkit/feePublicKey.c, we ignore
 105  * the Pm which used to be used as salt for the digest. That made staged verification
 106  * impossible and I do not believe it increased security.
 107  */
 108 void CryptKit::FEERawSigner::sign(
 109         const void              *data,
 110         size_t                  dataLen,
 111         void                    *sig,
 112         size_t                  *sigLen)        /* IN/OUT */
 113 {
 114         feeSig                  fsig;
 115         feeReturn               frtn;
 116         unsigned char   *feeSig = NULL;
 117         unsigned                feeSigLen=0;
 118
 119         if(mFeeKey == NULL) {
 120                 throwCryptKit(FR_BadPubKey, "FEERawSigner::sign (no key)");
 121         }
 122         fsig = feeSigNewWithKey(mFeeKey, mRandFcn, mRandRef);
 123         if(fsig == NULL) {
 124                 throwCryptKit(FR_BadPubKey, "FEERawSigner::sign");
 125         }
 126         frtn = feeSigSign(fsig,
 127                 (unsigned char *)data,
 128                 (unsigned)dataLen,
 129                 mFeeKey);
 130         if(frtn == FR_Success) {
 131                 frtn = feeSigData(fsig, &feeSig, &feeSigLen);
 132         }
 133         feeSigFree(fsig);
 134         if(frtn) {
 135                 throwCryptKit(frtn, "FEERawSigner::sign");
 136         }
 137
 138         /* copy out to caller and ffree */
 139         if(*sigLen < feeSigLen) {
 140                 feeSigObjDebug("FEERawSigner sign overflow\n");
 141                 ffree(feeSig);
 142                 CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
 143         }
 144         memmove(sig, feeSig, feeSigLen);
 145         *sigLen = feeSigLen;
 146         ffree(feeSig);
 147 }
 148
 149 void CryptKit::FEERawSigner::verify(
 150         const void              *data,
 151         size_t                  dataLen,
 152         const void              *sig,
 153         size_t                  sigLen)
 154 {
 155         feeSig          fsig;
 156         feeReturn       frtn;
 157
 158         if(mFeeKey == NULL) {
 159                 throwCryptKit(FR_BadPubKey, "FEERawSigner::verify (no key)");
 160         }
 161         frtn = feeSigParse((unsigned char *)sig, sigLen, &fsig);
 162         if(frtn) {
 163                 throwCryptKit(frtn, "feeSigParse");
 164         }
 165         frtn = feeSigVerify(fsig,
 166                 (unsigned char *)data,
 167                 (unsigned int)dataLen,
 168                 mFeeKey);
 169         feeSigFree(fsig);
 170         if(frtn) {
 171                 throwCryptKit(frtn, NULL);
 172         }
 173 }
 174
 175 size_t CryptKit::FEERawSigner::maxSigSize()
 176 {
 177         unsigned        rtn;
 178         feeReturn       frtn;
 179
 180         frtn = feeSigSize(mFeeKey, &rtn);
 181         if(frtn) {
 182                 throwCryptKit(frtn, "feeSigSize");
 183         }
 184         return rtn;
 185 }
 186
 187 /* ECDSA - this is really easy. */
 188
 189 void CryptKit::FEEECDSASigner::sign(
 190         const void              *data,
 191         size_t                  dataLen,
 192         void                    *sig,
 193         size_t                  *sigLen)        /* IN/OUT */
 194 {
 195         unsigned char   *feeSig;
 196         unsigned                feeSigLen;
 197         feeReturn               frtn;
 198
 199         if(mFeeKey == NULL) {
 200                 throwCryptKit(FR_BadPubKey, "FEERawSigner::sign (no key)");
 201         }
 202         frtn = feeECDSASign(mFeeKey,
 203         mSigFormat,
 204                 (unsigned char *)data,   // data to be signed
 205                 (unsigned int)dataLen,                          // in bytes
 206                 mRandFcn,
 207                 mRandRef,
 208                 &feeSig,
 209                 &feeSigLen);
 210         if(frtn) {
 211                 throwCryptKit(frtn, "feeECDSASign");
 212         }
 213         /* copy out to caller and ffree */
 214         if(*sigLen < feeSigLen) {
 215                 feeSigObjDebug("feeECDSASign overflow\n");
 216                 ffree(feeSig);
 217                 CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
 218         }
 219         memmove(sig, feeSig, feeSigLen);
 220         *sigLen = feeSigLen;
 221         ffree(feeSig);
 222
 223 }
 224
 225 void CryptKit::FEEECDSASigner::verify(
 226         const void      *data,
 227         size_t          dataLen,
 228         const void      *sig,
 229         size_t          sigLen)
 230 {
 231         feeReturn       frtn;
 232
 233         if(mFeeKey == NULL) {
 234                 throwCryptKit(FR_BadPubKey, "FEERawSigner::verify (no key)");
 235         }
 236         frtn = feeECDSAVerify(
 237         (unsigned char *)sig,
 238                 sigLen,
 239                 (unsigned char *)data,
 240                 (unsigned int)dataLen,
 241                 mFeeKey,
 242         mSigFormat);
 243         if(frtn) {
 244                 throwCryptKit(frtn, NULL);
 245         }
 246 }
 247
 248 size_t CryptKit::FEEECDSASigner::maxSigSize()
 249 {
 250         unsigned        rtn;
 251         feeReturn       frtn;
 252
 253         frtn = feeECDSASigSize(mFeeKey, &rtn);
 254         if(frtn) {
 255                 throwCryptKit(frtn, "feeECDSASigSize");
 256         }
 257         return rtn;
 258 }
 259
 260 #endif  /* CRYPTKIT_CSP_ENABLE */