53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
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#include "../params.h"
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#include "../xmss_core.h"
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#include <stdio.h>
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#define MLEN 32
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int main(int argc, char **argv) {
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FILE *keypair;
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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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if (argc != 2) {
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fprintf(stderr, "Expected keypair filename as only parameter, "
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"and the message via stdin.\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 = fopen(argv[1], "rb");
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if (keypair == 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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// 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);
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xmssmt_parse_oid(¶ms, oid_pk);
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// fseek past the public key
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fseek(keypair, params.publickey_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);
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xmssmt_parse_oid(¶ms, oid_sk);
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unsigned char sk[params.privatekey_bytes];
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unsigned char m[MLEN];
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unsigned char sm[params.bytes + MLEN];
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unsigned long long smlen;
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fread(sk, 1, params.privatekey_bytes, keypair);
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fread(m, 1, MLEN, stdin);
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xmssmt_core_sign(¶ms, sk, sm, &smlen, m, MLEN);
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fseek(keypair, -params.privatekey_bytes, SEEK_CUR);
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fwrite(sk, 1, params.privatekey_bytes, keypair);
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fwrite(sm, 1, params.bytes + MLEN, stdout);
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fclose(keypair);
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fclose(stdout);
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}
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