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3b4a06f52b
common/onion is going to need to use this for the case where it finds a blinding seed inside the TLV. But how it does ecdh is daemon-specific. We already had this problem for devtools/gossipwith, which supplied a special hsm_do_ecdh(). This just makes it more general. So we create a generic ecdh() interface, with a specific implementation which subdaemons and lightningd can use. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
30 lines
827 B
C
30 lines
827 B
C
#include <common/ecdh_hsmd.h>
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#include <hsmd/gen_hsm_wire.h>
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#include <wire/wire_sync.h>
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static int stashed_hsm_fd = -1;
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static void (*stashed_failed)(enum status_failreason, const char *fmt, ...);
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void ecdh(const struct pubkey *point, struct secret *ss)
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{
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const u8 *msg = towire_hsm_ecdh_req(NULL, point);
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if (!wire_sync_write(stashed_hsm_fd, take(msg)))
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stashed_failed(STATUS_FAIL_HSM_IO, "Write ECDH to hsmd failed");
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msg = wire_sync_read(tmpctx, stashed_hsm_fd);
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if (!msg)
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stashed_failed(STATUS_FAIL_HSM_IO, "No hsmd ECDH response");
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if (!fromwire_hsm_ecdh_resp(msg, ss))
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stashed_failed(STATUS_FAIL_HSM_IO, "Invalid hsmd ECDH response");
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}
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void ecdh_hsmd_setup(int hsm_fd,
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void (*failed)(enum status_failreason,
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const char *fmt, ...))
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{
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stashed_hsm_fd = hsm_fd;
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stashed_failed = failed;
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}
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