| 74 | } |
| 75 | |
| 76 | func P2SPMultiSigProgram(pubkeys []ed25519.PublicKey, nrequired int) ([]byte, error) { |
| 77 | err := checkMultiSigParams(int64(nrequired), int64(len(pubkeys))) |
| 78 | if err != nil { |
| 79 | return nil, err |
| 80 | } |
| 81 | builder := NewBuilder() |
| 82 | // Expected stack: [... NARGS SIG SIG SIG PREDICATE] |
| 83 | // Number of sigs must match nrequired. |
| 84 | builder.AddOp(vm.OP_DUP).AddOp(vm.OP_TOALTSTACK) // stash a copy of the predicate |
| 85 | builder.AddOp(vm.OP_SHA3) // stack is now [... NARGS SIG SIG SIG PREDICATEHASH] |
| 86 | for _, p := range pubkeys { |
| 87 | builder.AddData(p) |
| 88 | } |
| 89 | builder.AddInt64(int64(nrequired)) // stack is now [... SIG SIG SIG PREDICATEHASH PUB PUB PUB M] |
| 90 | builder.AddInt64(int64(len(pubkeys))) // stack is now [... SIG SIG SIG PREDICATEHASH PUB PUB PUB M N] |
| 91 | builder.AddOp(vm.OP_CHECKMULTISIG).AddOp(vm.OP_VERIFY) // stack is now [... NARGS] |
| 92 | builder.AddOp(vm.OP_FROMALTSTACK) // stack is now [... NARGS PREDICATE] |
| 93 | builder.AddInt64(0).AddOp(vm.OP_CHECKPREDICATE) |
| 94 | return builder.Program, nil |
| 95 | } |
| 96 | |
| 97 | func ParseP2SPMultiSigProgram(program []byte) ([]ed25519.PublicKey, int, error) { |
| 98 | pops, err := vm.ParseProgram(program) |