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| |
| /* |
| // |
| // Purpose: |
| // Cryptography Primitive. |
| // RSASSA-PKCS-v1_5 |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpngrsa.h" |
| #include "pcphash.h" |
| #include "pcptool.h" |
| |
| #include "pcprsa_emsa_pkcs1v15.h" |
| |
| static int GenerateSing(const Ipp8u* pMsg, int msgLen, /* message representation */ |
| const Ipp8u* pSalt, int saltLen, /* fied string */ |
| Ipp8u* pSign, |
| const IppsRSAPrivateKeyState* pPrvKey, |
| const IppsRSAPublicKeyState* pPubKey, |
| BNU_CHUNK_T* pBuffer) |
| { |
| /* size of RSA modulus in bytes and chunks */ |
| cpSize rsaBits = RSA_PRV_KEY_BITSIZE_N(pPrvKey); |
| cpSize k = BITS2WORD8_SIZE(rsaBits); |
| cpSize nsN = BITS_BNU_CHUNK(rsaBits); |
| |
| /* EMSA-PKCS-v1_5 encoding */ |
| int result = EMSA_PKCSv15(pMsg, msgLen, pSalt, saltLen, pSign, k); |
| |
| if (result) { |
| /* temporary BNs */ |
| __ALIGN8 IppsBigNumState bnC; |
| __ALIGN8 IppsBigNumState bnP; |
| |
| /* make BNs */ |
| BN_Make(pBuffer, pBuffer + nsN + 1, nsN, &bnC); |
| pBuffer += (nsN + 1) * 2; |
| BN_Make(pBuffer, pBuffer + nsN + 1, nsN, &bnP); |
| pBuffer += (nsN + 1) * 2; |
| |
| /* |
| // private-key operation |
| */ |
| ippsSetOctString_BN(pSign, k, &bnC); |
| |
| if (RSA_PRV_KEY1_VALID_ID(pPrvKey)) |
| gsRSAprv_cipher(&bnP, &bnC, pPrvKey, pBuffer); |
| else |
| gsRSAprv_cipher_crt(&bnP, &bnC, pPrvKey, pBuffer); |
| |
| ippsGetOctString_BN(pSign, k, &bnP); |
| |
| /* check the result before send it out (fault attack mitigatioin) */ |
| if (pPubKey) { |
| gsRSApub_cipher(&bnP, &bnP, pPubKey, pBuffer); |
| |
| /* check signature before send it out (fault attack mitigatioin) */ |
| if (0 != cpBN_cmp(&bnP, &bnC)) { |
| PaddBlock(0, pSign, k); |
| result = 0; |
| } |
| } |
| } |
| |
| return result; |
| } |