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.
84 rindas
2.2 KiB
C
84 rindas
2.2 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 xmssmt_sign
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#else
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#define XMSS_PARSE_OID xmss_parse_oid
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#define XMSS_SIGN xmss_sign
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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 *m_file;
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xmss_params params;
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uint32_t oid_pk;
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uint32_t oid_sk;
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unsigned long long mlen;
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if (argc != 3) {
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fprintf(stderr, "Expected keypair and message filenames as two "
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"parameters.\n"
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"The keypair is updated with the changed state, "
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"and the message + signature is output via stdout.\n");
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return -1;
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}
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keypair_file = fopen(argv[1], "r+b");
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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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m_file = fopen(argv[2], "rb");
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if (m_file == NULL) {
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fprintf(stderr, "Could not open 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(m_file, 0, SEEK_END);
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mlen = ftell(m_file);
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/* Read the OID from the public key, as we need its length to seek past it */
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fread(&oid_pk, 1, XMSS_OID_LEN, keypair_file);
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XMSS_PARSE_OID(¶ms, oid_pk);
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/* fseek past the public key */
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fseek(keypair_file, params.pk_bytes, SEEK_CUR);
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/* This is the OID we're actually going to use. Likely the same, but still. */
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fread(&oid_sk, 1, XMSS_OID_LEN, keypair_file);
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XMSS_PARSE_OID(¶ms, oid_sk);
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unsigned char sk[XMSS_OID_LEN + params.sk_bytes];
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unsigned char *m = malloc(mlen);
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unsigned char *sm = malloc(params.sig_bytes + mlen);
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unsigned long long smlen;
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/* fseek back to start of sk. */
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fseek(keypair_file, -((long int)XMSS_OID_LEN), SEEK_CUR);
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fseek(m_file, 0, SEEK_SET);
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fread(sk, 1, XMSS_OID_LEN + params.sk_bytes, keypair_file);
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fread(m, 1, mlen, m_file);
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XMSS_SIGN(sk, sm, &smlen, m, mlen);
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fseek(keypair_file, -((long int)params.sk_bytes), SEEK_CUR);
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fwrite(sk + XMSS_OID_LEN, 1, params.sk_bytes, keypair_file);
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fwrite(sm, 1, smlen, stdout);
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fclose(keypair_file);
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fclose(m_file);
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free(m);
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free(sm);
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return 0;
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}
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