diff options
| -rw-r--r-- | ext/openssl/ossl_cipher.c | 18 | ||||
| -rw-r--r-- | test/openssl/test_cipher.rb | 16 |
2 files changed, 31 insertions, 3 deletions
diff --git a/ext/openssl/ossl_cipher.c b/ext/openssl/ossl_cipher.c index 1910a5cdee..6f74c925c0 100644 --- a/ext/openssl/ossl_cipher.c +++ b/ext/openssl/ossl_cipher.c @@ -386,11 +386,23 @@ ossl_cipher_update(int argc, VALUE *argv, VALUE self) in = (unsigned char *)RSTRING_PTR(data); in_len = RSTRING_LEN(data); GetCipher(self, ctx); - out_len = in_len+EVP_CIPHER_CTX_block_size(ctx); - if (out_len <= 0) { + + /* + * As of OpenSSL 3.2, there is no reliable way to determine the required + * output buffer size for arbitrary cipher modes. + * https://github.com/openssl/openssl/issues/22628 + * + * in_len+block_size is usually sufficient, but AES key wrap with padding + * ciphers require in_len+15 even though they have a block size of 8 bytes. + * + * Using EVP_MAX_BLOCK_LENGTH (32) as a safe upper bound for ciphers + * currently implemented in OpenSSL, but this can change in the future. + */ + if (in_len > LONG_MAX - EVP_MAX_BLOCK_LENGTH) { ossl_raise(rb_eRangeError, "data too big to make output buffer: %ld bytes", in_len); } + out_len = in_len + EVP_MAX_BLOCK_LENGTH; if (NIL_P(str)) { str = rb_str_new(0, out_len); @@ -401,7 +413,7 @@ ossl_cipher_update(int argc, VALUE *argv, VALUE self) if (!ossl_cipher_update_long(ctx, (unsigned char *)RSTRING_PTR(str), &out_len, in, in_len)) ossl_raise(eCipherError, NULL); - assert(out_len < RSTRING_LEN(str)); + assert(out_len <= RSTRING_LEN(str)); rb_str_set_len(str, out_len); return str; diff --git a/test/openssl/test_cipher.rb b/test/openssl/test_cipher.rb index 8faa570648..41885fd59b 100644 --- a/test/openssl/test_cipher.rb +++ b/test/openssl/test_cipher.rb @@ -331,6 +331,22 @@ class OpenSSL::TestCipher < OpenSSL::TestCase assert_equal tag1, tag2 end + def test_aes_keywrap_pad + # RFC 5649 Section 6; The second example + kek = ["5840df6e29b02af1ab493b705bf16ea1ae8338f4dcc176a8"].pack("H*") + key = ["466f7250617369"].pack("H*") + wrap = ["afbeb0f07dfbf5419200f2ccb50bb24f"].pack("H*") + + begin + cipher = OpenSSL::Cipher.new("id-aes192-wrap-pad").encrypt + rescue OpenSSL::Cipher::CipherError, RuntimeError + omit "id-aes192-wrap-pad is not supported: #$!" + end + cipher.key = kek + ct = cipher.update(key) << cipher.final + assert_equal wrap, ct + end + def test_non_aead_cipher_set_auth_data assert_raise(OpenSSL::Cipher::CipherError) { cipher = OpenSSL::Cipher.new("aes-128-cfb").encrypt |