384b228c58
Previous code allocated an array on the stack of mlen bytes, but it should be possible to also sign heap-space messages. By relying on the fact that sm and m fit the message + signature, we move the message so that 4*n bytes of prefix can be added.
79 rader
1.8 KiB
C
79 rader
1.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "../params.h"
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#include "../xmss.h"
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#ifdef XMSSMT
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#define XMSS_PARSE_OID xmssmt_parse_oid
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#define XMSS_SIGN_OPEN xmssmt_sign_open
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#else
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#define XMSS_PARSE_OID xmss_parse_oid
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#define XMSS_SIGN_OPEN xmss_sign_open
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#endif
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int main(int argc, char **argv) {
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FILE *keypair_file;
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FILE *sm_file;
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xmss_params params;
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uint32_t oid;
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unsigned long long smlen;
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int ret;
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if (argc != 3) {
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fprintf(stderr, "Expected keypair and signature + message filenames "
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"as two parameters.\n"
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"Keypair file needs only to contain the public key.\n"
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"The return code 0 indicates verification success.\n");
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return -1;
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}
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keypair_file = fopen(argv[1], "rb");
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if (keypair_file == NULL) {
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fprintf(stderr, "Could not open keypair file.\n");
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return -1;
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}
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sm_file = fopen(argv[2], "rb");
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if (sm_file == NULL) {
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fprintf(stderr, "Could not open signature + message file.\n");
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return -1;
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}
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/* Find out the message length. */
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fseek(sm_file, 0, SEEK_END);
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smlen = ftell(sm_file);
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fread(&oid, 1, XMSS_OID_LEN, keypair_file);
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XMSS_PARSE_OID(¶ms, oid);
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unsigned char pk[XMSS_OID_LEN + params.pk_bytes];
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unsigned char *sm = malloc(smlen);
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unsigned char *m = malloc(smlen);
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unsigned long long mlen;
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fseek(keypair_file, 0, SEEK_SET);
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fseek(sm_file, 0, SEEK_SET);
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fread(pk, 1, XMSS_OID_LEN + params.pk_bytes, keypair_file);
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fread(sm, 1, smlen, sm_file);
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ret = XMSS_SIGN_OPEN(m, &mlen, sm, smlen, pk);
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if (ret) {
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printf("Verification failed!\n");
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}
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else {
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printf("Verification succeeded.\n");
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}
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fclose(keypair_file);
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fclose(sm_file);
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free(m);
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free(sm);
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return ret;
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}
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