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Enable use of nullptr for 0 length plaintext/ciphertext in crypto #10198

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Oct 4, 2021
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Enable use of nullptr for 0 length plaintext/ciphertext in crypto #10198

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183d0d1
Enable use of nullptr for 0 length plaintext/ciphertext in crypto
pan-apple Oct 4, 2021
9182e18
address review comments
pan-apple Oct 4, 2021
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8 changes: 6 additions & 2 deletions src/crypto/CHIPCryptoPAL.h
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Original file line number Diff line number Diff line change
Expand Up @@ -477,7 +477,9 @@ CHIP_ERROR ConvertIntegerRawToDerWithoutTag(const ByteSpan & raw_integer, Mutabl
* @brief A function that implements AES-CCM encryption
*
* This implements the CHIP_Crypto_AEAD_GenerateEncrypt() cryptographic primitive
* from the specification.
* from the specification. For an empty plaintext, the user of the API can provide
* an empty string, or a nullptr, and provide plaintext_length as 0. The output buffer,
* ciphertext can also be an empty string, or a nullptr for this case.
*
* @param plaintext Plaintext to encrypt
* @param plaintext_length Length of plain_text
Expand All @@ -500,7 +502,9 @@ CHIP_ERROR AES_CCM_encrypt(const uint8_t * plaintext, size_t plaintext_length, c
* @brief A function that implements AES-CCM decryption
*
* This implements the CHIP_Crypto_AEAD_DecryptVerify() cryptographic primitive
* from the specification.
* from the specification. For an empty ciphertext, the user of the API can provide
* an empty string, or a nullptr, and provide ciphertext_length as 0. The output buffer,
* plaintext can also be an empty string, or a nullptr for this case.
*
* @param ciphertext Ciphertext to decrypt
* @param ciphertext_length Length of ciphertext
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24 changes: 24 additions & 0 deletions src/crypto/CHIPCryptoPALOpenSSL.cpp
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Expand Up @@ -132,6 +132,18 @@ CHIP_ERROR AES_CCM_encrypt(const uint8_t * plaintext, size_t plaintext_length, c
int result = 1;
const EVP_CIPHER * type = nullptr;

const uint8_t * empty_plaintext = Uint8::from_const_char("");
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if (plaintext_length != 0)
{
VerifyOrExit(plaintext != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(ciphertext != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
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}
else if (plaintext == nullptr)
{
plaintext = empty_plaintext;
}

VerifyOrExit(key != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(_isValidKeyLength(key_length), error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(iv != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
Expand Down Expand Up @@ -214,6 +226,18 @@ CHIP_ERROR AES_CCM_decrypt(const uint8_t * ciphertext, size_t ciphertext_length,
int result = 1;
const EVP_CIPHER * type = nullptr;

const uint8_t * empty_ciphertext = Uint8::from_const_char("");

if (ciphertext_length != 0)
{
VerifyOrExit(ciphertext != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(plaintext != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
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}
else if (ciphertext == nullptr)
{
ciphertext = empty_ciphertext;
}

VerifyOrExit(tag != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(_isValidTagLength(tag_length), error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(key != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
Expand Down
12 changes: 12 additions & 0 deletions src/crypto/CHIPCryptoPALmbedTLS.cpp
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Expand Up @@ -112,6 +112,12 @@ CHIP_ERROR AES_CCM_encrypt(const uint8_t * plaintext, size_t plaintext_length, c
mbedtls_ccm_context context;
mbedtls_ccm_init(&context);

if (plaintext_length != 0)
{
VerifyOrExit(plaintext != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(ciphertext != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
}
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VerifyOrExit(key != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(_isValidKeyLength(key_length), error = CHIP_ERROR_UNSUPPORTED_ENCRYPTION_TYPE);
VerifyOrExit(iv != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
Expand Down Expand Up @@ -151,6 +157,12 @@ CHIP_ERROR AES_CCM_decrypt(const uint8_t * ciphertext, size_t ciphertext_len, co
mbedtls_ccm_context context;
mbedtls_ccm_init(&context);

if (ciphertext_len != 0)
{
VerifyOrExit(ciphertext != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(plaintext != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
}

VerifyOrExit(tag != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(_isValidTagLength(tag_length), error = CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrExit(key != nullptr, error = CHIP_ERROR_INVALID_ARGUMENT);
Expand Down
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