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core/crypto: Add chacha20
This package implements the ChaCha20 stream cipher as specified in RFC 8439, and the somewhat non-standard XChaCha20 variant that supports a 192-bit nonce. While an IETF draft for XChaCha20 standardization exists, implementations that pre-date the draft use a 64-bit counter, instead of the IETF-style 32-bit one. This implementation opts for the latter as compatibility with libsodium is more important than compatibility with an expired IETF draft.
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Yawning Angel
@@ -116,6 +116,7 @@ main :: proc() {
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test_haval_256(&t)
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// "modern" crypto tests
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test_chacha20(&t)
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test_poly1305(&t)
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test_x25519(&t)
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@@ -2,8 +2,10 @@ package test_core_crypto
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import "core:testing"
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import "core:fmt"
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import "core:mem"
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import "core:time"
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import "core:crypto/chacha20"
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import "core:crypto/poly1305"
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import "core:crypto/x25519"
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@@ -28,6 +30,94 @@ _decode_hex32 :: proc(s: string) -> [32]byte{
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return b
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}
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@(test)
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test_chacha20 :: proc(t: ^testing.T) {
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log(t, "Testing (X)ChaCha20")
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// Test cases taken from RFC 8439, and draft-irtf-cfrg-xchacha-03
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plaintext_str := "Ladies and Gentlemen of the class of '99: If I could offer you only one tip for the future, sunscreen would be it."
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plaintext := transmute([]byte)(plaintext_str)
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key := [chacha20.KEY_SIZE]byte{
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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}
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nonce := [chacha20.NONCE_SIZE]byte{
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4a,
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0x00, 0x00, 0x00, 0x00,
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}
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ciphertext := [114]byte{
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0x6e, 0x2e, 0x35, 0x9a, 0x25, 0x68, 0xf9, 0x80,
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0x41, 0xba, 0x07, 0x28, 0xdd, 0x0d, 0x69, 0x81,
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0xe9, 0x7e, 0x7a, 0xec, 0x1d, 0x43, 0x60, 0xc2,
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0x0a, 0x27, 0xaf, 0xcc, 0xfd, 0x9f, 0xae, 0x0b,
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0xf9, 0x1b, 0x65, 0xc5, 0x52, 0x47, 0x33, 0xab,
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0x8f, 0x59, 0x3d, 0xab, 0xcd, 0x62, 0xb3, 0x57,
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0x16, 0x39, 0xd6, 0x24, 0xe6, 0x51, 0x52, 0xab,
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0x8f, 0x53, 0x0c, 0x35, 0x9f, 0x08, 0x61, 0xd8,
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0x07, 0xca, 0x0d, 0xbf, 0x50, 0x0d, 0x6a, 0x61,
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0x56, 0xa3, 0x8e, 0x08, 0x8a, 0x22, 0xb6, 0x5e,
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0x52, 0xbc, 0x51, 0x4d, 0x16, 0xcc, 0xf8, 0x06,
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0x81, 0x8c, 0xe9, 0x1a, 0xb7, 0x79, 0x37, 0x36,
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0x5a, 0xf9, 0x0b, 0xbf, 0x74, 0xa3, 0x5b, 0xe6,
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0xb4, 0x0b, 0x8e, 0xed, 0xf2, 0x78, 0x5e, 0x42,
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0x87, 0x4d,
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}
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ciphertext_str := hex_string(ciphertext[:])
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derived_ciphertext: [114]byte
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ctx: chacha20.Context = ---
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chacha20.init(&ctx, key[:], nonce[:])
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chacha20.seek(&ctx, 1) // The test vectors start the counter at 1.
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chacha20.xor_bytes(&ctx, derived_ciphertext[:], plaintext[:])
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derived_ciphertext_str := hex_string(derived_ciphertext[:])
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expect(t, derived_ciphertext_str == ciphertext_str, fmt.tprintf("Expected %s for xor_bytes(plaintext_str), but got %s instead", ciphertext_str, derived_ciphertext_str))
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xkey := [chacha20.KEY_SIZE]byte{
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0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
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0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
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0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
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}
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xnonce := [chacha20.XNONCE_SIZE]byte{
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0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
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0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
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0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
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}
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xciphertext := [114]byte{
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0xbd, 0x6d, 0x17, 0x9d, 0x3e, 0x83, 0xd4, 0x3b,
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0x95, 0x76, 0x57, 0x94, 0x93, 0xc0, 0xe9, 0x39,
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0x57, 0x2a, 0x17, 0x00, 0x25, 0x2b, 0xfa, 0xcc,
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0xbe, 0xd2, 0x90, 0x2c, 0x21, 0x39, 0x6c, 0xbb,
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0x73, 0x1c, 0x7f, 0x1b, 0x0b, 0x4a, 0xa6, 0x44,
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0x0b, 0xf3, 0xa8, 0x2f, 0x4e, 0xda, 0x7e, 0x39,
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0xae, 0x64, 0xc6, 0x70, 0x8c, 0x54, 0xc2, 0x16,
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0xcb, 0x96, 0xb7, 0x2e, 0x12, 0x13, 0xb4, 0x52,
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0x2f, 0x8c, 0x9b, 0xa4, 0x0d, 0xb5, 0xd9, 0x45,
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0xb1, 0x1b, 0x69, 0xb9, 0x82, 0xc1, 0xbb, 0x9e,
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0x3f, 0x3f, 0xac, 0x2b, 0xc3, 0x69, 0x48, 0x8f,
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0x76, 0xb2, 0x38, 0x35, 0x65, 0xd3, 0xff, 0xf9,
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0x21, 0xf9, 0x66, 0x4c, 0x97, 0x63, 0x7d, 0xa9,
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0x76, 0x88, 0x12, 0xf6, 0x15, 0xc6, 0x8b, 0x13,
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0xb5, 0x2e,
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}
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xciphertext_str := hex_string(xciphertext[:])
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chacha20.init(&ctx, xkey[:], xnonce[:])
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chacha20.seek(&ctx, 1)
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chacha20.xor_bytes(&ctx, derived_ciphertext[:], plaintext[:])
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derived_ciphertext_str = hex_string(derived_ciphertext[:])
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expect(t, derived_ciphertext_str == xciphertext_str, fmt.tprintf("Expected %s for xor_bytes(plaintext_str), but got %s instead", xciphertext_str, derived_ciphertext_str))
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}
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@(test)
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test_poly1305 :: proc(t: ^testing.T) {
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log(t, "Testing poly1305")
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@@ -141,24 +231,49 @@ test_x25519 :: proc(t: ^testing.T) {
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bench_modern :: proc(t: ^testing.T) {
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fmt.println("Starting benchmarks:")
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bench_chacha20(t)
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bench_poly1305(t)
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bench_x25519(t)
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}
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_setup_poly1305 :: proc(options: ^time.Benchmark_Options, allocator := context.allocator) -> (err: time.Benchmark_Error) {
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_setup_sized_buf :: proc(options: ^time.Benchmark_Options, allocator := context.allocator) -> (err: time.Benchmark_Error) {
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assert(options != nil)
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options.input = make([]u8, options.bytes, allocator)
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return nil if len(options.input) == options.bytes else .Allocation_Error
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}
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_teardown_poly1305 :: proc(options: ^time.Benchmark_Options, allocator := context.allocator) -> (err: time.Benchmark_Error) {
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_teardown_sized_buf :: proc(options: ^time.Benchmark_Options, allocator := context.allocator) -> (err: time.Benchmark_Error) {
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assert(options != nil)
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delete(options.input)
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return nil
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}
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_benchmark_chacha20 :: proc(options: ^time.Benchmark_Options, allocator := context.allocator) -> (err: time.Benchmark_Error) {
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buf := options.input
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key := [chacha20.KEY_SIZE]byte{
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0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef,
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0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef,
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0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef,
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0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef,
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}
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nonce := [chacha20.NONCE_SIZE]byte{
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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}
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ctx: chacha20.Context = ---
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chacha20.init(&ctx, key[:], nonce[:])
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for _ in 0..=options.rounds {
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chacha20.xor_bytes(&ctx, buf, buf)
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}
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options.count = options.rounds
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options.processed = options.rounds * options.bytes
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return nil
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}
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_benchmark_poly1305 :: proc(options: ^time.Benchmark_Options, allocator := context.allocator) -> (err: time.Benchmark_Error) {
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buf := options.input
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key := [poly1305.KEY_SIZE]byte{
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@@ -189,14 +304,41 @@ benchmark_print :: proc(name: string, options: ^time.Benchmark_Options) {
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)
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}
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bench_chacha20 :: proc(t: ^testing.T) {
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name := "ChaCha20 64 bytes"
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options := &time.Benchmark_Options{
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rounds = 1_000,
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bytes = 64,
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setup = _setup_sized_buf,
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bench = _benchmark_chacha20,
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teardown = _teardown_sized_buf,
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}
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err := time.benchmark(options, context.allocator)
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expect(t, err == nil, name)
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benchmark_print(name, options)
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name = "ChaCha20 1024 bytes"
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options.bytes = 1024
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err = time.benchmark(options, context.allocator)
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expect(t, err == nil, name)
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benchmark_print(name, options)
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name = "ChaCha20 65536 bytes"
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options.bytes = 65536
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err = time.benchmark(options, context.allocator)
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expect(t, err == nil, name)
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benchmark_print(name, options)
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}
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bench_poly1305 :: proc(t: ^testing.T) {
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name := "Poly1305 64 zero bytes"
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options := &time.Benchmark_Options{
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rounds = 1_000,
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bytes = 64,
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setup = _setup_poly1305,
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setup = _setup_sized_buf,
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bench = _benchmark_poly1305,
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teardown = _teardown_poly1305,
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teardown = _teardown_sized_buf,
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}
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err := time.benchmark(options, context.allocator)
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