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POrnddata digest issue
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12731747
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0
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2012-10-04T16:33:41.270
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2012-10-10T15:39:57.597
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2012-10-04T16:40:00.207
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311966
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1703846
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text
Body
I tried to generate a big file for digest. When I used below openssl rand 8096 | head -c 8096 > rnddata, it was ok. ./hash_test sha1 Digest is: a0a4dab4a16d247fb625ca2abf07373d2123e4a5 openssl dgst -sha1 rnddata SHA1(rnddata)= a0a4dab4a16d247fb625ca2abf07373d2123e4a5 But the digest result was different when the rnddata's size is equal to or greater then 9000. openssl rand 9000 | head -c 9000 > rnddata openssl dgst -sha1 rnddata SHA1(rnddata)= 4ef5b73ee39f0f2ac6d341c55467c182786cab65 ./hash_test sha1 Digest is: 691747a97aee32ddf04b3bf5644b5d74c4b69657 Below is my c code for test <pre><code>#include <stdio.h> #include <openssl/evp.h> main(int argc, char *argv[]) { EVP_MD_CTX mdctx; const EVP_MD *md; FILE *fr; size_t bytes; char mystring[32]; fr = fopen("/home/root/rnddata", "r"); if(fr == NULL) printf("Error opening file\n"); unsigned char md_value[EVP_MAX_MD_SIZE]; int md_len, i; OpenSSL_add_all_digests(); //OpenSSL_add_all_algorithms(); if(!argv[1]) { printf("Usage: mdtest digestname\n"); exit(1); } //md = EVP_get_digestbyname(argv[1]); md = EVP_sha1(); if(!md) { printf("Unknown message digest %s\n", argv[1]); exit(1); } EVP_MD_CTX_init(&mdctx); EVP_DigestInit_ex(&mdctx, md, NULL); while ((bytes = fread (mystring, 1, 32, fr)) != 0) EVP_DigestUpdate(&mdctx, mystring, bytes); EVP_DigestFinal_ex(&mdctx, md_value, &md_len); EVP_MD_CTX_cleanup(&mdctx); printf("Digest is: "); for(i = 0; i < md_len; i++) printf("%02x", md_value[i]); printf("\n"); fclose(fr); } </code></pre> Any help is appreciated. 
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<c><random><openssl><digest>
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rnddata digest issue
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