补位函数RSA_padding_add_PKCS1_type_1等

#include "stdafx.h" #define RSA_PKCS1_PADDING_SIZE 11 int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen, const unsigned char *from, int flen) { int j; unsigned char *p; if (flen > (tlen-RSA_PKCS1_PADDING_SIZE)) { //RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); return(0); } p=(unsigned char *)to; *(p++)=0; *(p++)=1; /* Private Key BT (Block Type) */ /* pad out with 0xff data */ j=tlen-3-flen; memset(p,0xff,j); p+=j; *(p++)='\0'; memcpy(p,from,(unsigned int)flen); return(1); } int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen, const unsigned char *from, int flen, int num) { int i,j; const unsigned char *p; p=from; if ((num != (flen+1)) || (*(p++) != 01)) { //RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BLOCK_TYPE_IS_NOT_01); return(-1); } /* scan over padding data */ j=flen-1; /* one for type. */ for (i=0; i<j; i++) { if (*p != 0xff) /* should decrypt to 0xff */ { if (*p == 0) { p++; break; } else { //RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_FIXED_HEADER_DECRYPT); return(-1); } } p++; } if (i == j) { //RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_NULL_BEFORE_BLOCK_MISSING); return(-1); } if (i < 8) { //RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_PAD_BYTE_COUNT); return(-1); } i++; /* Skip over the '\0' */ j-=i; if (j > tlen) { //RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE); return(-1); } memcpy(to,p,(unsigned int)j); return(j); } int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen, const unsigned char *from, int flen) { //int i,j; //unsigned char *p; // //if (flen > (tlen-11)) // { // //RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); // return(0); // } // //p=(unsigned char *)to; //*(p++)=0; //*(p++)=2; /* Public Key BT (Block Type) */ ///* pad out with non-zero random data */ //j=tlen-3-flen; //if (RAND_bytes(p,j) <= 0) // return(0); //for (i=0; i<j; i++) // { // if (*p == '\0') // do { // if (RAND_bytes(p,1) <= 0) // return(0); // } while (*p == '\0'); // p++; // } //*(p++)='\0'; //memcpy(p,from,(unsigned int)flen); return(1); } int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen, const unsigned char *from, int flen, int num) { int i,j; const unsigned char *p; p=from; if ((num != (flen+1)) || (*(p++) != 02)) { //RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BLOCK_TYPE_IS_NOT_02); return(-1); } #ifdef PKCS1_CHECK return(num-11); #endif /* scan over padding data */ j=flen-1; /* one for type. */ for (i=0; i<j; i++) if (*(p++) == 0) break; if (i == j) { //RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_NULL_BEFORE_BLOCK_MISSING); return(-1); } if (i < 8) { //RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BAD_PAD_BYTE_COUNT); return(-1); } i++; /* Skip over the '\0' */ j-=i; if (j > tlen) { //RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE); return(-1); } memcpy(to,p,(unsigned int)j); return(j); }