62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
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#include <stdio.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#define CHUNK_SIZE 8 * 1024
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int main(int argc, char *argv[]) {
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if (argc == 0) {
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fprintf(stderr, "Usage: streamhash <algorithm>\n");
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return 1;
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}
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <algorithm>\n", argv[0]);
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return 1;
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}
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const EVP_MD *type = EVP_get_digestbyname(argv[1]);
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if (!type) {
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fprintf(stderr, "Invalid algorithm: %s\n", argv[1]);
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return 1;
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}
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EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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if (EVP_DigestInit(ctx, type) != 1) {
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ERR_print_errors_fp(stderr);
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return 1;
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}
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char chunk[CHUNK_SIZE];
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char loop = 1;
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while (loop) {
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size_t size = fread(chunk, 1, CHUNK_SIZE, stdin);
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if (size != CHUNK_SIZE) {
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if (feof(stdin))
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loop = 0;
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else {
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EVP_MD_CTX_free(ctx);
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perror("fread");
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return 1;
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}
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}
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if (fwrite(chunk, 1, size, stdout) != size) {
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EVP_MD_CTX_free(ctx);
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perror("fwrite");
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return 1;
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}
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if (EVP_DigestUpdate(ctx, chunk, size) != 1) {
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EVP_MD_CTX_free(ctx);
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ERR_print_errors_fp(stderr);
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return 1;
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}
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}
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unsigned char md[EVP_MAX_MD_SIZE];
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unsigned int size;
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if (EVP_DigestFinal(ctx, md, &size) != 1) {
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ERR_print_errors_fp(stderr);
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EVP_MD_CTX_free(ctx);
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return 1;
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}
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for (unsigned int i=0; i < size; i++)
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fprintf(stderr, "%02x", md[i]);
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fprintf(stderr, "\n");
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return 0;
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}
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