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The maximum count is SKEY_MAX_SEQ + 1 not SKEY_MAX_SEQ - 1.
Sequence numbers are in the range [0, SKEY_MAX_SEQ] inclusive. This means the maximum value for the -n option (count) should be SKEY_MAX_SEQ + 1. From Denis Bodor.
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@ -1,4 +1,4 @@
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/* $OpenBSD: skey.c,v 1.35 2019/01/25 00:19:26 millert Exp $ */
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/* $OpenBSD: skey.c,v 1.36 2024/08/03 22:00:31 millert Exp $ */
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/*
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* OpenBSD S/Key (skey.c)
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*
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@ -60,7 +60,8 @@ main(int argc, char *argv[])
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case 'n':
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if (++i == argc)
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usage();
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cnt = strtonum(argv[i], 1, SKEY_MAX_SEQ -1, &errstr);
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cnt = strtonum(argv[i], 1, SKEY_MAX_SEQ + 1,
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&errstr);
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if (errstr)
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usage();
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break;
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