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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
GenerateSing(const Ipp8u * pMsg,int msgLen,const Ipp8u * pSalt,int saltLen,Ipp8u * pSign,const IppsRSAPrivateKeyState * pPrvKey,const IppsRSAPublicKeyState * pPubKey,BNU_CHUNK_T * pBuffer)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 }