CommonCryptorChaCha20Poly1305.c   [plain text]

/*
* Copyright (c) 2019 Apple Inc. All Rights Reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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*/

#include "ccdebug.h"
#include <CommonCrypto/CommonCryptor.h>
#include <CommonCrypto/CommonCryptorSPI.h>

#include <corecrypto/cc.h>
#include <corecrypto/cc_priv.h>
#include <corecrypto/ccchacha20poly1305.h>
#include <corecrypto/ccchacha20poly1305_priv.h>

static inline CCCryptorStatus translate_corecrypto_error_code(int error)
{
    switch (error) {
        case CCERR_OK:
            return kCCSuccess;
        case CCERR_PARAMETER:
            return kCCParamError;
        default:
            return kCCUnspecifiedError;
    }
}

static inline CCCryptorStatus validate_parameters(size_t keyLength, size_t ivLen, size_t tagLength)
{
    if (keyLength != CCCHACHA20_KEY_NBYTES) {
        return kCCKeySizeError;
    }
    if (ivLen != CCCHACHA20_NONCE_NBYTES) {
        return kCCParamError;
    }
    if (tagLength != CCPOLY1305_TAG_NBYTES) {
        return kCCParamError;
    }

    return kCCSuccess;
}

CCCryptorStatus CCCryptorChaCha20Poly1305OneshotEncrypt(const void  *key, size_t keyLength,
                                                        const void  *iv, size_t ivLen,
                                                        const void  *aData, size_t aDataLen,
                                                        const void  *dataIn, size_t dataInLength,
                                                        void *dataOut, void *tagOut, size_t tagLength)

{
    CCCryptorStatus validate_result = validate_parameters(keyLength, ivLen, tagLength);
    if (validate_result != kCCSuccess) {
        return  validate_result;
    }
    if (tagOut == NULL) {
        return kCCParamError;
    }

    int result = ccchacha20poly1305_encrypt_oneshot(ccchacha20poly1305_info(), key, iv, aDataLen, aData, dataInLength, dataIn, dataOut, tagOut);
    return translate_corecrypto_error_code(result);
}

CCCryptorStatus CCCryptorChaCha20Poly1305OneshotDecrypt(const void  *key, size_t keyLength,
                                                        const void  *iv, size_t ivLen,
                                                        const void  *aData, size_t aDataLen,
                                                        const void  *dataIn, size_t dataInLength,
                                                        void *dataOut, const void *tagIn, size_t tagLength)

{
    CCCryptorStatus validate_result = validate_parameters(keyLength, ivLen, tagLength);
    if (validate_result != kCCSuccess) {
        return  validate_result;
    }

    int result = ccchacha20poly1305_decrypt_oneshot(ccchacha20poly1305_info(), key, iv, aDataLen, aData, dataInLength, dataIn, dataOut, tagIn);
    return translate_corecrypto_error_code(result);
}