DER_Keys.c

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/* Copyright (c) 2005-2007 Apple Inc.  All Rights Reserved. */
 
/*
 * DER_Cert.c - support for decoding RSA keys
 *
 * Created Nov. 8 2005 by Doug Mitchell.
 */
 
#include "DER_Decode.h"
#include "DER_Encode.h"
#include "DER_Keys.h"
#include "asn1Types.h"
#include "libDER_config.h"
 
#ifndef DER_DECODE_ENABLE
#error Please define DER_DECODE_ENABLE.
#endif
#if   DER_DECODE_ENABLE
 
/* 
 * DERItemSpecs for decoding RSA keys. 
 */
 
/* Algorithm Identifier */
const DERItemSpec DERAlgorithmIdItemSpecs[] = 
{
  { DER_OFFSET(DERAlgorithmId, oid),
      ASN1_OBJECT_ID,
      DER_DEC_NO_OPTS },
  { DER_OFFSET(DERAlgorithmId, params),
      0,        /* no tag - any */
      DER_DEC_ASN_ANY | DER_DEC_OPTIONAL | DER_DEC_SAVE_DER }
};
const DERShort DERNumAlgorithmIdItemSpecs = 
  sizeof(DERAlgorithmIdItemSpecs) / sizeof(DERItemSpec);
 
/* X509 SubjectPublicKeyInfo */
const DERItemSpec DERSubjPubKeyInfoItemSpecs[] = 
{
  { DER_OFFSET(DERSubjPubKeyInfo, algId),
      ASN1_CONSTR_SEQUENCE, 
      DER_DEC_NO_OPTS },    
  { DER_OFFSET(DERSubjPubKeyInfo, pubKey),
      ASN1_BIT_STRING,  
      DER_DEC_NO_OPTS },    
 
};
const DERShort DERNumSubjPubKeyInfoItemSpecs = 
  sizeof(DERSubjPubKeyInfoItemSpecs) / sizeof(DERItemSpec);
 
/* 
 * RSA private key in CRT format
 */
const DERItemSpec DERRSAPrivKeyCRTItemSpecs[] = 
{
  /* version, n, e, d - skip */
  { 0,
      ASN1_INTEGER,
      DER_DEC_SKIP },
  { 0,
      ASN1_INTEGER,
      DER_DEC_SKIP },
  { 0,
      ASN1_INTEGER,
      DER_DEC_SKIP },
  { 0,
      ASN1_INTEGER,
      DER_DEC_SKIP },
  { DER_OFFSET(DERRSAPrivKeyCRT, p),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS },    
  { DER_OFFSET(DERRSAPrivKeyCRT, q),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS },    
  { DER_OFFSET(DERRSAPrivKeyCRT, dp),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS },    
  { DER_OFFSET(DERRSAPrivKeyCRT, dq),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS },    
  { DER_OFFSET(DERRSAPrivKeyCRT, qInv),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS },    
  /* ignore the (optional) rest */
};
const DERShort DERNumRSAPrivKeyCRTItemSpecs = 
  sizeof(DERRSAPrivKeyCRTItemSpecs) / sizeof(DERItemSpec);
 
#endif  /* DER_DECODE_ENABLE */
 
#if   DER_DECODE_ENABLE || DER_ENCODE_ENABLE
 
/* RSA public key in PKCS1 format - encode and decode */
const DERItemSpec DERRSAPubKeyPKCS1ItemSpecs[] = 
{
  { DER_OFFSET(DERRSAPubKeyPKCS1, modulus),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS | DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAPubKeyPKCS1, pubExponent),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS | DER_ENC_SIGNED_INT },   
};
const DERShort DERNumRSAPubKeyPKCS1ItemSpecs = 
  sizeof(DERRSAPubKeyPKCS1ItemSpecs) / sizeof(DERItemSpec);
 
/* RSA public key in Apple custome format with reciprocal - encode and decode */
const DERItemSpec DERRSAPubKeyAppleItemSpecs[] = 
{
  { DER_OFFSET(DERRSAPubKeyApple, modulus),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS | DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAPubKeyApple, reciprocal),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS | DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAPubKeyApple, pubExponent),
      ASN1_INTEGER, 
      DER_DEC_NO_OPTS | DER_ENC_SIGNED_INT },   
};
const DERShort DERNumRSAPubKeyAppleItemSpecs = 
  sizeof(DERRSAPubKeyAppleItemSpecs) / sizeof(DERItemSpec);
 
 
#endif    /* DER_DECODE_ENABLE || DER_ENCODE_ENABLE */
 
#ifndef DER_ENCODE_ENABLE
#error Please define DER_ENCODE_ENABLE.
#endif
 
#if   DER_ENCODE_ENABLE
 
/* RSA Key Pair, encode only */
const DERItemSpec DERRSAKeyPairItemSpecs[] = 
{
  { DER_OFFSET(DERRSAKeyPair, version),
      ASN1_INTEGER, 
      DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAKeyPair, n),
      ASN1_INTEGER, 
      DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAKeyPair, e),
      ASN1_INTEGER, 
      DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAKeyPair, d),
      ASN1_INTEGER, 
      DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAKeyPair, p),
      ASN1_INTEGER, 
      DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAKeyPair, q),
      ASN1_INTEGER, 
      DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAKeyPair, dp),
      ASN1_INTEGER, 
      DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAKeyPair, dq),
      ASN1_INTEGER, 
      DER_ENC_SIGNED_INT },   
  { DER_OFFSET(DERRSAKeyPair, qInv),
      ASN1_INTEGER, 
      DER_ENC_SIGNED_INT },   
};
 
const DERShort DERNumRSAKeyPairItemSpecs = 
  sizeof(DERRSAKeyPairItemSpecs) / sizeof(DERItemSpec);
 
#endif  /* DER_ENCODE_ENABLE */