81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
#include <stdio.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/err.h>
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#include <string.h>
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#define MAXBUF 1024
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void handle_errors(){
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ERR_print_errors_fp(stderr);
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abort();
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}
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int main(int argc, char **argv){
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unsigned char key[] = "keykeykeykeykeykey";
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if(argc != 3){
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fprintf(stderr,"Invalid parameters. Usage: %s filename\n",argv[0]);
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exit(1);
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}
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FILE *f_in,*f_in2;
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if((f_in = fopen(argv[1],"r")) == NULL) {
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fprintf(stderr,"Couldn't open the input file, try again\n");
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exit(1);
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}
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if((f_in2 = fopen(argv[2],"r")) == NULL) {
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fprintf(stderr,"Couldn't open the second input file, try again\n");
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exit(1);
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}
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//EVP_MD_CTX *EVP_MD_CTX_new(void);
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//pedantic mode? Check if md == NULL
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EVP_MD_CTX *hmac_ctx = EVP_MD_CTX_new();
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//int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type);
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// int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl);
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// Returns 1 for success and 0 for failure.
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EVP_PKEY *hkey;
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hkey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, key, 18);
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if(!EVP_DigestSignInit(hmac_ctx, NULL, EVP_sha256(), NULL, hkey))
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handle_errors();
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size_t n;
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unsigned char buffer[MAXBUF];
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while((n = fread(buffer,1,MAXBUF,f_in)) > 0){
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// Returns 1 for success and 0 for failure.
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if(!EVP_DigestSignUpdate(hmac_ctx, buffer, n))
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handle_errors();
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}
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unsigned char buf2[MAXBUF];
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while((n = fread(buf2,1,MAXBUF,f_in2)) > 0){
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if(!EVP_DigestSignUpdate(hmac_ctx, buf2, n))
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handle_errors();
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}
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unsigned char hmac_value[EVP_MD_size(EVP_sha256())];
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size_t hmac_len = EVP_MD_size(EVP_sha256());
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//int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned size_t *s);
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// EVP_DigestSignFinal(hmac_ctx, NULL, &hmac_len);
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if(!EVP_DigestSignFinal(hmac_ctx, hmac_value, &hmac_len))
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handle_errors();
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// void EVP_MD_CTX_free(EVP_MD_CTX *ctx);
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EVP_MD_CTX_free(hmac_ctx);
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printf("The HMAC is: ");
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for(int i = 0; i < hmac_len; i++)
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printf("%02x", hmac_value[i]);
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printf("\n");
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return 0;
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} |