Zig 0.17.0-dev (Split by item)

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verifyRsa

Certificate.verifyRsa

fn verifyRsa(
    comptime Hash: type,
    msg: []const u8,
    sig: []const u8,
    pub_key_algo: Parsed.PubKeyAlgo,
    pub_key: []const u8,
) !void

File

lib/std/crypto/Certificate.zig:778

Code

fn verifyRsa(
    comptime Hash: type,
    msg: []const u8,
    sig: []const u8,
    pub_key_algo: Parsed.PubKeyAlgo,
    pub_key: []const u8,
) !void {
    if (pub_key_algo != .rsaEncryption) return error.CertificateSignatureAlgorithmMismatch;
    const pk_components = try rsa.PublicKey.parseDer(pub_key);
    const exponent = pk_components.exponent;
    const modulus = pk_components.modulus;
    if (exponent.len > modulus.len) return error.CertificatePublicKeyInvalid;
    if (sig.len != modulus.len) return error.CertificateSignatureInvalidLength;

    switch (modulus.len) {
        inline 128, 256, 384, 512 => |modulus_len| {
            const public_key = rsa.PublicKey.fromBytes(exponent, modulus) catch
                return error.CertificateSignatureInvalid;
            rsa.PKCS1v1_5Signature.verify(modulus_len, sig[0..modulus_len].*, msg, public_key, Hash) catch
                return error.CertificateSignatureInvalid;
        },
        else => return error.CertificateSignatureUnsupportedBitCount,
    }
}