PRIVATEKEYBLOB to RSA struct of OpenSSL

how can i convert Mi开发者_开发知识库crosoft exported key in privatekeyblob to struct RSA, which can be used with openSSL?

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On inspection of the documents, it looks like the fields map across pretty intuitively, one to one. Have you tried implementing mapping code using this information? I would give that a go if not.

Here is the Microsoft blob (linked to RSAPUBKEY):

typedef struct _RSAPUBKEY {
  DWORD magic;
  DWORD bitlen;
  DWORD pubexp;
} RSAPUBKEY;

BLOBHEADER blobheader;
RSAPUBKEY rsapubkey;
BYTE modulus[rsapubkey.bitlen/8];
BYTE prime1[rsapubkey.bitlen/16];
BYTE prime2[rsapubkey.bitlen/16];
BYTE exponent1[rsapubkey.bitlen/16];
BYTE exponent2[rsapubkey.bitlen/16];
BYTE coefficient[rsapubkey.bitlen/16];
BYTE privateExponent[rsapubkey.bitlen/8];

Here is the RSA struct:

 struct
        {
        BIGNUM *n;              // public modulus
        BIGNUM *e;              // public exponent
        BIGNUM *d;              // private exponent
        BIGNUM *p;              // secret prime factor
        BIGNUM *q;              // secret prime factor
        BIGNUM *dmp1;           // d mod (p-1)
        BIGNUM *dmq1;           // d mod (q-1)
        BIGNUM *iqmp;           // q^-1 mod p
        // ...
        };
 RSA