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595fbd2a19
The "path" is just a message to ourselves. This meets the minimal requirement for bolt12 invoices: that there be a blinded path (at least so we can use the path_id inside in place of "payment_secret"). We expose the method to make this path_id to a common routine: offers will need this for generating more sophisticated paths. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
20 lines
529 B
C
20 lines
529 B
C
#include "config.h"
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#include <bitcoin/privkey.h>
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#include <ccan/crypto/sha256/sha256.h>
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#include <common/invoice_path_id.h>
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u8 *invoice_path_id(const tal_t *ctx,
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const struct secret *base_secret,
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const struct sha256 *payment_hash)
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{
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struct sha256_ctx shactx;
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struct sha256 secret;
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sha256_init(&shactx);
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sha256_update(&shactx, base_secret, sizeof(*base_secret));
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sha256_update(&shactx, payment_hash, sizeof(*payment_hash));
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sha256_done(&shactx, &secret);
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return (u8 *)tal_dup(ctx, struct sha256, &secret);
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}
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