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Simplify ed25519 instruction index

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Allow u16::MAX to be specified for the instruction index. This makes it
possible to specify the current instruction, so it is not necessary to
know the instruction number.
This commit is contained in:
Sean Young
2021-09-13 18:03:15 +01:00
parent db4252c688
commit 2400e86d13
2 changed files with 34 additions and 27 deletions
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11
docs/src/developing/runtime-facilities/programs.md
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@ -71,7 +71,7 @@ Verify ed25519 signature program. This program takes an ed25519 signature, publi
Multiple signatures can be verified. If any of the signatures fail to verify, an error is returned.
- Program id: `Ed25519SigVerify111111111111111111111111111`
- Instructions: [new_ed25519_instruction](https://github.com/solana-labs/solana/blob/master/sdk/src/ed25519_instruction.rs#L31)
- Instructions: [new_ed25519_instruction](https://github.com/solana-labs/solana/blob/master/sdk/src/ed25519_instruction.rs#L45)
The ed25519 program processes an instruction. The first `u8` is a count of the number of
signatures to check, which is followed by a single byte padding. After that, the
@ -96,9 +96,12 @@ process_instruction() {
for i in 0..count {
// i'th index values referenced:
instructions = &transaction.message().instructions
signature = instructions[ed25519_signature_instruction_index].data[ed25519_signature_offset..ed25519_signature_offset + 64]
pubkey = instructions[ed25519_pubkey_instruction_index].data[ed25519_pubkey_offset..ed25519_pubkey_offset + 32]
message = instructions[ed25519_message_instruction_index].data[ed25519_message_data_offset..ed25519_message_data_offset + ed25519_message_data_size]
instruction_index = ed25519_signature_instruction_index != u16::MAX ? ed25519_signature_instruction_index : current_instruction;
signature = instructions[instruction_index].data[ed25519_signature_offset..ed25519_signature_offset + 64]
instruction_index = ed25519_pubkey_instruction_index != u16::MAX ? ed25519_pubkey_instruction_index : current_instruction;
pubkey = instructions[instruction_index].data[ed25519_pubkey_offset..ed25519_pubkey_offset + 32]
instruction_index = ed25519_message_instruction_index != u16::MAX ? ed25519_message_instruction_index : current_instruction;
message = instructions[instruction_index].data[ed25519_message_data_offset..ed25519_message_data_offset + ed25519_message_data_size]
if pubkey.verify(signature, message) != Success {
return Error
}