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     40 
     41 /*
     42 //
     43 //  Purpose:
     44 //     Cryptography Primitive.
     45 //     RSASSA-PKCS-v1_5
     46 //
     47 */
     48 
     49 #include "owndefs.h"
     50 #include "owncp.h"
     51 #include "pcpngrsa.h"
     52 #include "pcphash.h"
     53 #include "pcptool.h"
     54 
     55 #include "pcprsa_emsa_pkcs1v15.h"
     56 
     57 static int GenerateSing(const Ipp8u* pMsg, int msgLen,  /* message representation */
     58     const Ipp8u* pSalt, int saltLen, /* fied string */
     59     Ipp8u* pSign,
     60     const IppsRSAPrivateKeyState* pPrvKey,
     61     const IppsRSAPublicKeyState*  pPubKey,
     62     BNU_CHUNK_T* pBuffer)
     63 {
     64     /* size of RSA modulus in bytes and chunks */
     65     cpSize rsaBits = RSA_PRV_KEY_BITSIZE_N(pPrvKey);
     66     cpSize k = BITS2WORD8_SIZE(rsaBits);
     67     cpSize nsN = BITS_BNU_CHUNK(rsaBits);
     68 
     69     /* EMSA-PKCS-v1_5 encoding */
     70     int result = EMSA_PKCSv15(pMsg, msgLen, pSalt, saltLen, pSign, k);
     71 
     72     if (result) {
     73         /* temporary BNs */
     74         __ALIGN8 IppsBigNumState bnC;
     75         __ALIGN8 IppsBigNumState bnP;
     76 
     77         /* make BNs */
     78         BN_Make(pBuffer, pBuffer + nsN + 1, nsN, &bnC);
     79         pBuffer += (nsN + 1) * 2;
     80         BN_Make(pBuffer, pBuffer + nsN + 1, nsN, &bnP);
     81         pBuffer += (nsN + 1) * 2;
     82 
     83         /*
     84         // private-key operation
     85         */
     86         ippsSetOctString_BN(pSign, k, &bnC);
     87 
     88         if (RSA_PRV_KEY1_VALID_ID(pPrvKey))
     89             gsRSAprv_cipher(&bnP, &bnC, pPrvKey, pBuffer);
     90         else
     91             gsRSAprv_cipher_crt(&bnP, &bnC, pPrvKey, pBuffer);
     92 
     93         ippsGetOctString_BN(pSign, k, &bnP);
     94 
     95         /* check the result before send it out (fault attack mitigatioin) */
     96         if (pPubKey) {
     97             gsRSApub_cipher(&bnP, &bnP, pPubKey, pBuffer);
     98 
     99             /* check signature before send it out (fault attack mitigatioin) */
    100             if (0 != cpBN_cmp(&bnP, &bnC)) {
    101                 PaddBlock(0, pSign, k);
    102                 result = 0;
    103             }
    104         }
    105     }
    106 
    107     return result;
    108 }