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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
EMSA_PKCSv15(const Ipp8u * msgDg,int lenMsgDg,const Ipp8u * fixPS,int lenFixPS,Ipp8u * pEM,int lenEM)55 static int EMSA_PKCSv15(const Ipp8u* msgDg, int lenMsgDg,
56 const Ipp8u* fixPS, int lenFixPS,
57 Ipp8u* pEM, int lenEM)
58 {
59 /*
60 // encoded message format:
61 // EM = 00 || 01 || PS=(FF..FF) || 00 || T
62 // T = fixPS || msgDg
63 // len(PS) >= 8
64 */
65 int tLen = lenFixPS + lenMsgDg;
66
67 if (lenEM >= tLen + 11) {
68 int psLen = lenEM - 3 - tLen;
69
70 PaddBlock(0xFF, pEM, lenEM);
71 pEM[0] = 0x00;
72 pEM[1] = 0x01;
73 pEM[2 + psLen] = 0x00;
74 CopyBlock(fixPS, pEM + 3 + psLen, lenFixPS);
75 CopyBlock(msgDg, pEM + 3 + psLen + lenFixPS, lenMsgDg);
76 return 1;
77 }
78 else
79 return 0; /* encoded message length too long */
80 }