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47 changes: 47 additions & 0 deletions
47
packages/extension/src/providers/bitcoin/libs/sign-message-utils.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| import { sha256 } from "ethereumjs-util"; | ||
|
|
||
| const MAGIC_BYTES = Buffer.from("Bitcoin Signed Message:\n"); | ||
|
|
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| const varintBufNum = (n: number) => { | ||
| let buf; | ||
| if (n < 253) { | ||
| buf = Buffer.alloc(1); | ||
| buf.writeUInt8(n, 0); | ||
| } else if (n < 0x10000) { | ||
| buf = Buffer.alloc(1 + 2); | ||
| buf.writeUInt8(253, 0); | ||
| buf.writeUInt16LE(n, 1); | ||
| } else if (n < 0x100000000) { | ||
| buf = Buffer.alloc(1 + 4); | ||
| buf.writeUInt8(254, 0); | ||
| buf.writeUInt32LE(n, 1); | ||
| } else { | ||
| buf = Buffer.alloc(1 + 8); | ||
| buf.writeUInt8(255, 0); | ||
| buf.writeInt32LE(n & -1, 1); | ||
| buf.writeUInt32LE(Math.floor(n / 0x100000000), 5); | ||
| } | ||
| return buf; | ||
| }; | ||
|
|
||
| export const magicHash = (messageBuffer: Buffer) => { | ||
| const prefix1 = varintBufNum(MAGIC_BYTES.length); | ||
| const prefix2 = varintBufNum(messageBuffer.length); | ||
| const buf = Buffer.concat([prefix1, MAGIC_BYTES, prefix2, messageBuffer]); | ||
| return sha256(sha256(buf)); | ||
| }; | ||
|
|
||
| export const toCompact = ( | ||
| i: number, | ||
| signature: Uint8Array, | ||
| compressed: boolean | ||
| ) => { | ||
| if (!(i === 0 || i === 1 || i === 2 || i === 3)) { | ||
| throw new Error("i must be equal to 0, 1, 2, or 3"); | ||
| } | ||
| let val = i + 27 + 4; | ||
| if (!compressed) { | ||
| val = val - 4; | ||
| } | ||
| return Buffer.concat([Uint8Array.of(val), Uint8Array.from(signature)]); | ||
| }; |
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Virus total analysis
chrome:
https://www.virustotal.com/gui/file/ccd3f84a022f26c83b56bee89a01288cb64c1c5acea21da20dfb2ff02b9dae2e
firefox:
https://www.virustotal.com/gui/file/c8937a0e25ca67e0cd8a9836815b669ee47c72235bd6ab2c7ba56c02c5c4f5dd