54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
#include <stdio.h>
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#include <openssl/evp.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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int main(int argc, char **argv){
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if(argc != 2){
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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;
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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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//EVP_MD_CTX *EVP_MD_CTX_new(void);
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EVP_MD_CTX *md = 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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EVP_DigestInit(md, EVP_sha256());
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int 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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EVP_DigestUpdate(md, buffer, n);
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}
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unsigned char md_value[EVP_MD_size(EVP_sha256())];
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int md_len;
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//int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *s);
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EVP_DigestFinal_ex(md, md_value, &md_len);
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// void EVP_MD_CTX_free(EVP_MD_CTX *ctx);
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EVP_MD_CTX_free(md);
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printf("The digest is: ");
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for(int i = 0; i < md_len; i++)
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printf("%02x", md_value[i]);
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printf("\n");
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return 0;
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}
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