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make pem private key buffers smaller with comments

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Muki Kiboigo
2026-03-04 05:52:32 -08:00
parent 6161c0d701
commit e4b32a1a91
1 changed files with 5 additions and 4 deletions
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9
src/browser/WebBotAuth.zig
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@@ -41,8 +41,8 @@ fn parsePemPrivateKey(pem: []const u8) !*crypto.EVP_PKEY {
const b64 = std.mem.trim(u8, pem[start_idx + begin.len .. end_idx], &std.ascii.whitespace); const b64 = std.mem.trim(u8, pem[start_idx + begin.len .. end_idx], &std.ascii.whitespace);
// strip newlines from b64 // Ed25519 PKCS#8 DER is always 48 bytes, which base64-encodes to exactly 64 chars
var clean: [4096]u8 = undefined; var clean: [64]u8 = undefined;
var clean_len: usize = 0; var clean_len: usize = 0;
for (b64) |ch| { for (b64) |ch| {
if (ch != '\n' and ch != '\r') { if (ch != '\n' and ch != '\r') {
@@ -51,11 +51,12 @@ fn parsePemPrivateKey(pem: []const u8) !*crypto.EVP_PKEY {
} }
} }
var der: [128]u8 = undefined; // decode base64 into 48-byte DER buffer
var der: [48]u8 = undefined;
const decoded_len = try std.base64.standard.Decoder.calcSizeForSlice(clean[0..clean_len]); const decoded_len = try std.base64.standard.Decoder.calcSizeForSlice(clean[0..clean_len]);
try std.base64.standard.Decoder.decode(der[0..decoded_len], clean[0..clean_len]); try std.base64.standard.Decoder.decode(der[0..decoded_len], clean[0..clean_len]);
// Ed25519 PKCS#8: key bytes are at offset 16, 32 bytes long // Ed25519 PKCS#8 structure always places the 32-byte raw private key at offset 16.
const key_bytes = der[16..48]; const key_bytes = der[16..48];
const pkey = crypto.EVP_PKEY_new_raw_private_key(crypto.EVP_PKEY_ED25519, null, key_bytes.ptr, 32); const pkey = crypto.EVP_PKEY_new_raw_private_key(crypto.EVP_PKEY_ED25519, null, key_bytes.ptr, 32);