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| #include<stdio.h> #include<stdlib.h> #include<string.h> #include<openssl/rsa.h> #include<openssl/pem.h> #include<openssl/err.h>
int base64_encode(char *in_str, int in_len, char *out_str) { BIO *b64, *bio; BUF_MEM *bptr = NULL; size_t size = 0;
if (in_str == NULL || out_str == NULL) return -1;
b64 = BIO_new(BIO_f_base64()); bio = BIO_new(BIO_s_mem()); bio = BIO_push(b64, bio);
BIO_write(bio, in_str, in_len); BIO_flush(bio);
BIO_get_mem_ptr(bio, &bptr); memcpy(out_str, bptr->data, bptr->length); out_str[bptr->length] = '\0'; size = bptr->length;
BIO_free_all(bio); return size; }
int base64_decode(char *in_str, int in_len, char *out_str) { BIO *b64, *bio; BUF_MEM *bptr = NULL; int counts; int size = 0;
if (in_str == NULL || out_str == NULL) return -1;
b64 = BIO_new(BIO_f_base64()); //BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
bio = BIO_new_mem_buf(in_str, in_len); bio = BIO_push(b64, bio);
size = BIO_read(bio, out_str, in_len); out_str[size] = '\0';
BIO_free_all(bio); return size; }
int main(int argc, char** argv) {
char data[3048]; char out[2048]; char data_base64_pre[3048]; char data_base64[3048]; char data_unbase64[3048];
char *pub_key_path = argv[1]; char *priv_key_path = argv[2]; char *data_path = argv[3]; RSA *pub_rsa; RSA *priv_rsa; FILE *file; int flen,rsa_len; int enc_len = 0; int dec_len = 0; int data_len = 0; int data_unbase64_len = 0; int data_base64_len = 0; int data_base64_pre_len = 0;
char* enc_buf; char* dec_buf;
BIO* bio_data;
BIO* bio; BIO* bio_enc;
BIO* bio_64; BUF_MEM *bptr;
if (argc != 4) { printf("\n usage:\n"); printf("\t %s pub_key_file priv_key_file data_file\n", argv[0]); exit(0); }
if((file=fopen(pub_key_path,"r"))==NULL){ perror("open public key file error"); return NULL; } if((pub_rsa=PEM_read_RSA_PUBKEY(file,NULL,NULL,NULL))==NULL){ ERR_print_errors_fp(stdout); return NULL; } fclose(file);
if((file=fopen(priv_key_path,"r"))==NULL){ perror("open private key file error"); return NULL; } if((priv_rsa=PEM_read_RSAPrivateKey(file,NULL,NULL,NULL))==NULL){ ERR_print_errors_fp(stdout); return NULL; } fclose(file);
bzero(data, sizeof(data)); if((file=fopen(data_path,"r"))==NULL){ perror("open private key file error"); return NULL; } data_len = fread(data, 1, sizeof(data), file); printf("read data length:%d\n", data_len); fclose(file);
bio = BIO_new(BIO_s_mem()); BIO_write(bio, data, data_len);
bio_enc = BIO_new(BIO_s_mem());
rsa_len = RSA_size(pub_rsa); //printf("pub rsa size:%d\n", rsa_len); enc_buf = malloc(rsa_len); while(1) { char data[100]; int data_len = BIO_read(bio, data, sizeof(data)); // printf("read bytes:%d\n", data_len); if (data_len <= 0) { break; } bzero(enc_buf, rsa_len); enc_len = RSA_public_encrypt(data_len, data, enc_buf, pub_rsa, RSA_PKCS1_PADDING); //printf("encoded length:%d\n", enc_len); BIO_write(bio_enc, enc_buf, enc_len); } BIO_free(bio); BIO_flush(bio_enc);
// all the data has been encript BIO_get_mem_ptr(bio_enc, &bptr); memcpy(data_base64_pre, bptr->data, bptr->length); data_base64_pre_len = bptr->length;
BIO_free(bio_enc);
//printf("length after encoded:%d\n", data_len); //now base64 encode data_base64_len = base64_encode(data_base64_pre, data_base64_pre_len, data_base64); //printf("data length after base64 encode:%d\n", data_base64_len); // printf("data content after base64 encode:\n%s\n", data_base64); int i = 0; for(i=0;i<1000;i++) { // now decript data_unbase64_len = base64_decode(data_base64, data_base64_len, data_unbase64); //printf("data length after base64 decode:%d\n", data_base64_len); //printf("data content after base64 decode:%s\n", data_unbase64);
//printf("base64 decode length:%d\n", data_unbase64_len); bio_64 = BIO_new(BIO_s_mem()); BIO_write(bio_64, data_unbase64, data_base64_len);
dec_buf = malloc(rsa_len); while(1) { dec_len = BIO_read(bio_64, dec_buf, rsa_len); if(dec_len <= 0) { break; } bzero(out, sizeof(out)); dec_len = RSA_private_decrypt(dec_len, dec_buf, out, priv_rsa, RSA_PKCS1_PADDING); //printf("%s", out); } BIO_free(bio_64); } }
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