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Crypt/Base: fix continuous mode in CBC / decryption / OpenSSL

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This commit is contained in:
terrafrost 2016-02-05 23:50:30 -06:00
parent b972a4b36d
commit bfd467532b
1 changed files with 8 additions and 2 deletions
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10
phpseclib/Crypt/Base.php
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@ -746,10 +746,13 @@ class Crypt_Base
return !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result; return !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result;
case CRYPT_MODE_CBC: case CRYPT_MODE_CBC:
$result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->encryptIV); $result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->encryptIV);
if (!defined('OPENSSL_RAW_DATA')) {
$result = substr($result, 0, -$this->block_size);
}
if ($this->continuousBuffer) { if ($this->continuousBuffer) {
$this->encryptIV = substr($result, -$this->block_size); $this->encryptIV = substr($result, -$this->block_size);
} }
return !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result; return $result;
case CRYPT_MODE_CTR: case CRYPT_MODE_CTR:
return $this->_openssl_ctr_process($plaintext, $this->encryptIV, $this->enbuffer); return $this->_openssl_ctr_process($plaintext, $this->encryptIV, $this->enbuffer);
case CRYPT_MODE_CFB: case CRYPT_MODE_CFB:
@ -1052,10 +1055,13 @@ class Crypt_Base
if (!defined('OPENSSL_RAW_DATA')) { if (!defined('OPENSSL_RAW_DATA')) {
$padding = str_repeat(chr($this->block_size), $this->block_size) ^ substr($ciphertext, -$this->block_size); $padding = str_repeat(chr($this->block_size), $this->block_size) ^ substr($ciphertext, -$this->block_size);
$ciphertext.= substr(openssl_encrypt($padding, $this->cipher_name_openssl_ecb, $this->key, true), 0, $this->block_size); $ciphertext.= substr(openssl_encrypt($padding, $this->cipher_name_openssl_ecb, $this->key, true), 0, $this->block_size);
$offset = 2 * $this->block_size;
} else {
$offset = $this->block_size;
} }
$plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->decryptIV); $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->decryptIV);
if ($this->continuousBuffer) { if ($this->continuousBuffer) {
$this->decryptIV = substr($ciphertext, -$this->block_size); $this->decryptIV = substr($ciphertext, -$offset, $this->block_size);
} }
break; break;
case CRYPT_MODE_CTR: case CRYPT_MODE_CTR: