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40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive.
45 // RSASSA-PKCS-v1_5
46 //
47 //
48 */
49
50 #include "owndefs.h"
51 #include "owncp.h"
52 #include "pcpngrsa.h"
53 #include "pcphash.h"
54 #include "pcptool.h"
55
56 #include "pcprsa_emsa_pkcs1v15.h"
57
VerifySing(const Ipp8u * pMsg,int msgLen,const Ipp8u * pSalt,int saltLen,const Ipp8u * pSign,int * pIsValid,const IppsRSAPublicKeyState * pKey,BNU_CHUNK_T * pBuffer)58 static int VerifySing(const Ipp8u* pMsg, int msgLen, /* message representation */
59 const Ipp8u* pSalt, int saltLen, /* fied string */
60 const Ipp8u* pSign,
61 int* pIsValid,
62 const IppsRSAPublicKeyState* pKey,
63 BNU_CHUNK_T* pBuffer)
64 {
65 /* size of RSA modulus in bytes and chunks */
66 cpSize rsaBits = RSA_PUB_KEY_BITSIZE_N(pKey);
67 cpSize k = BITS2WORD8_SIZE(rsaBits);
68 cpSize nsN = BITS_BNU_CHUNK(rsaBits);
69
70 /* temporary BNs */
71 __ALIGN8 IppsBigNumState bnC;
72 __ALIGN8 IppsBigNumState bnP;
73
74 /* make BNs */
75 BN_Make(pBuffer, pBuffer + nsN + 1, nsN, &bnC);
76 pBuffer += (nsN + 1) * 2;
77 BN_Make(pBuffer, pBuffer + nsN + 1, nsN, &bnP);
78 pBuffer += (nsN + 1) * 2;
79
80 /*
81 // public-key operation
82 */
83 ippsSetOctString_BN(pSign, k, &bnP);
84 gsRSApub_cipher(&bnC, &bnP, pKey, pBuffer);
85
86 /* convert EM into the string */
87 ippsGetOctString_BN((Ipp8u*)(BN_BUFFER(&bnC)), k, &bnC);
88
89 /* EMSA-PKCS-v1_5 encoding */
90 if (EMSA_PKCSv15(pMsg, msgLen, pSalt, saltLen, (Ipp8u*)(BN_NUMBER(&bnC)), k)) {
91 *pIsValid = 1 == EquBlock((Ipp8u*)(BN_BUFFER(&bnC)), (Ipp8u*)(BN_NUMBER(&bnC)), k);
92 return 1;
93 }
94 else
95 return 0;
96 }