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-rw-r--r--src/noscrypt.c71
-rw-r--r--src/noscryptutil.c47
2 files changed, 74 insertions, 44 deletions
diff --git a/src/noscrypt.c b/src/noscrypt.c
index deadca6..fededaf 100644
--- a/src/noscrypt.c
+++ b/src/noscrypt.c
@@ -310,7 +310,7 @@ static _nc_fn_inline NCResult _encryptNip44Ex(
result = NC_SUCCESS;
- ncSpanInitC(&nonceSpan, args->nonceData, NC_ENCRYPTION_NONCE_SIZE);
+ ncSpanInitC(&nonceSpan, args->nonceData, NC_NIP44_IV_SIZE);
/* Message key will be derrived on every encryption call */
if (_getMessageKey(ck, nonceSpan, &messageKey) != CSTATUS_OK)
@@ -344,13 +344,14 @@ static _nc_fn_inline NCResult _decryptNip44Ex(const NCContext* ctx, const struct
struct message_key messageKey;
const struct nc_expand_keys* cipherKeys;
- DEBUG_ASSERT2(ctx != NULL, "Expected valid context")
- DEBUG_ASSERT2(ck != NULL, "Expected valid conversation key")
- DEBUG_ASSERT2(args != NULL, "Expected valid encryption args")
+ DEBUG_ASSERT2(ctx != NULL, "Expected valid context");
+ DEBUG_ASSERT2(ck != NULL, "Expected valid conversation key");
+ DEBUG_ASSERT2(args != NULL, "Expected valid encryption args");
+ DEBUG_ASSERT(args->version == NC_ENC_VERSION_NIP44);
result = NC_SUCCESS;
- ncSpanInitC(&nonceSpan, args->nonceData, NC_ENCRYPTION_NONCE_SIZE);
+ ncSpanInitC(&nonceSpan, args->nonceData, NC_NIP44_IV_SIZE);
if (_getMessageKey(ck, nonceSpan, &messageKey) != CSTATUS_OK)
{
@@ -401,7 +402,7 @@ static NCResult _verifyMacEx(
DEBUG_ASSERT2(conversationKey != NULL, "Expected valid conversation key")
DEBUG_ASSERT2(args != NULL, "Expected valid mac verification args")
- ncSpanInitC(&nonceSpan, args->nonce32, NC_ENCRYPTION_NONCE_SIZE);
+ ncSpanInitC(&nonceSpan, args->nonce32, NC_NIP44_IV_SIZE);
ncSpanInitC(&payloadSpan, args->payload, args->payloadSize);
/*
@@ -979,7 +980,7 @@ Cleanup:
return result;
}
-NC_EXPORT NCResult NCComputeMac(
+NC_EXPORT NCResult NC_CC NCComputeMac(
const NCContext* ctx,
const uint8_t hmacKey[NC_HMAC_KEY_SIZE],
const uint8_t* payload,
@@ -1069,13 +1070,14 @@ Cleanup:
#define ENSURE_ENC_MODE(args, mode) if(args->version != mode) return E_VERSION_NOT_SUPPORTED;
-NC_EXPORT NCResult NCSetEncryptionPropertyEx(
+NC_EXPORT NCResult NC_CC NCEncryptionSetPropertyEx(
NCEncryptionArgs* args,
uint32_t property,
uint8_t* value,
uint32_t valueLen
)
{
+ uint32_t ivSize;
CHECK_NULL_ARG(args, 0)
CHECK_NULL_ARG(value, 2)
@@ -1091,22 +1093,6 @@ NC_EXPORT NCResult NCSetEncryptionPropertyEx(
return NC_SUCCESS;
- case NC_ENC_SET_NIP04_IV:
- /*
- * The safest way to store the nip04 IV is in the nonce
- * field. An IV is essentially a nonce. A secure random
- * number used to encrypt the first block of a CBC chain.
- */
-
- CHECK_ARG_RANGE(valueLen, AES_IV_SIZE, UINT32_MAX, 3)
-
- ENSURE_ENC_MODE(args, NC_ENC_VERSION_NIP04)
-
- args->nonceData = value;
-
- return NC_SUCCESS;
-
-
case NC_ENC_SET_NIP04_KEY:
/*
* The AES key is stored in the hmac key field, since
@@ -1122,13 +1108,17 @@ NC_EXPORT NCResult NCSetEncryptionPropertyEx(
return NC_SUCCESS;
- case NC_ENC_SET_NIP44_NONCE:
+ case NC_ENC_SET_IV:
+
+ ivSize = NCEncryptionGetIvSize(args->version);
- /* Nonce buffer must be at least the size, max doesnt matter */
- CHECK_ARG_RANGE(valueLen, NC_ENCRYPTION_NONCE_SIZE, UINT32_MAX, 3)
+ /* Gaurd invalid version */
+ if (ivSize == 0)
+ {
+ return E_VERSION_NOT_SUPPORTED;
+ }
- /* Nonce is only used in nip44 mode */
- ENSURE_ENC_MODE(args, NC_ENC_VERSION_NIP44)
+ CHECK_ARG_RANGE(valueLen, ivSize, ivSize, 3)
args->nonceData = value;
@@ -1155,13 +1145,13 @@ NC_EXPORT NCResult NCSetEncryptionPropertyEx(
return E_INVALID_ARG;
}
-NC_EXPORT NCResult NCSetEncryptionProperty(
+NC_EXPORT NCResult NC_CC NCEncryptionSetProperty(
NCEncryptionArgs* args,
uint32_t property,
uint32_t value
)
{
- return NCSetEncryptionPropertyEx(
+ return NCEncryptionSetPropertyEx(
args,
property,
(uint8_t*)&value,
@@ -1169,7 +1159,7 @@ NC_EXPORT NCResult NCSetEncryptionProperty(
);
}
-NC_EXPORT NCResult NCSetEncryptionData(
+NC_EXPORT NCResult NC_CC NCEncryptionSetData(
NCEncryptionArgs* args,
const uint8_t* input,
uint8_t* output,
@@ -1186,4 +1176,19 @@ NC_EXPORT NCResult NCSetEncryptionData(
args->dataSize = dataSize;
return NC_SUCCESS;
-} \ No newline at end of file
+}
+
+NC_EXPORT uint32_t NC_CC NCEncryptionGetIvSize(uint32_t version)
+{
+ switch (version)
+ {
+ case NC_ENC_VERSION_NIP04:
+ return NC_NIP04_IV_SIZE;
+
+ case NC_ENC_VERSION_NIP44:
+ return NC_NIP44_IV_SIZE;
+
+ default:
+ return 0;
+ }
+}
diff --git a/src/noscryptutil.c b/src/noscryptutil.c
index 4cee2c3..0d7a55c 100644
--- a/src/noscryptutil.c
+++ b/src/noscryptutil.c
@@ -37,6 +37,7 @@
#define MIN_PADDING_SIZE 0x20u
#define NIP44_VERSION_SIZE 0x01u
#define NIP44_PT_LEN_SIZE sizeof(uint16_t)
+#define NIP44_NONCE_SIZE NC_NIP44_IV_SIZE
/*
* minimum size for a valid nip44 payload
@@ -200,7 +201,7 @@ static _nc_fn_inline uint32_t _calcNip44TotalOutSize(uint32_t inputSize)
bufferSize = NIP44_VERSION_SIZE;
- bufferSize += NC_ENCRYPTION_NONCE_SIZE;
+ bufferSize += NIP44_NONCE_SIZE;
bufferSize += NIP44_PT_LEN_SIZE;
@@ -267,7 +268,7 @@ static _nc_fn_inline int _nip44ParseSegments(
*nonce = ncSpanSliceC(
payload,
NIP44_VERSION_SIZE,
- NC_ENCRYPTION_NONCE_SIZE
+ NIP44_NONCE_SIZE
);
/*
@@ -293,8 +294,8 @@ static _nc_fn_inline int _nip44ParseSegments(
*/
*cipherText = ncSpanSliceC(
payload,
- NIP44_VERSION_SIZE + NC_ENCRYPTION_NONCE_SIZE,
- payload.size - (NIP44_VERSION_SIZE + NC_ENCRYPTION_NONCE_SIZE + NC_ENCRYPTION_MAC_SIZE)
+ NIP44_VERSION_SIZE + NIP44_NONCE_SIZE,
+ payload.size - (NIP44_VERSION_SIZE + NIP44_NONCE_SIZE + NC_ENCRYPTION_MAC_SIZE)
);
return 1;
@@ -357,12 +358,23 @@ static NCResult _nip44EncryptCompleteCore(
ZERO_FILL(hmacKeyOut, sizeof(hmacKeyOut));
+ /* Get the nonce/iv size so we know how much nonce data to write */
+ result = NCUtilCipherGetIvSize(state);
+ DEBUG_ASSERT(result > 0);
+
/* Start by appending the version number */
ncSpanAppend(message, &outPos, Nip44VersionValue, sizeof(Nip44VersionValue));
/* next is nonce data */
- ncSpanAppend(message, &outPos, encArgs.nonceData, NC_ENCRYPTION_NONCE_SIZE);
- DEBUG_ASSERT(outPos == 1 + NC_ENCRYPTION_NONCE_SIZE);
+ ncSpanAppend(message, &outPos, encArgs.nonceData, (uint32_t)result);
+
+ /*
+ * Assert the output points to the end of the nonce segment
+ * for nip44 this is exactly 33 bytes. This assert also doubles
+ * to check the output of NCUtilCipherGetIvSize() to ensure
+ * it's returning the correct size for nip44
+ */
+ DEBUG_ASSERT(outPos == 1 + NIP44_NONCE_SIZE);
/*
* Assign the hmac key from the stack buffer. Since the args structure
@@ -372,7 +384,7 @@ static NCResult _nip44EncryptCompleteCore(
* addresses.
*/
- result = NCSetEncryptionPropertyEx(
+ result = NCEncryptionSetPropertyEx(
&encArgs,
NC_ENC_SET_NIP44_MAC_KEY,
hmacKeyOut,
@@ -397,7 +409,7 @@ static NCResult _nip44EncryptCompleteCore(
* plainText size field.
*/
- result = NCSetEncryptionData(
+ result = NCEncryptionSetData(
&encArgs,
ncSpanGetOffset(message, outPos), /* in place encryption */
ncSpanGetOffset(message, outPos),
@@ -517,7 +529,7 @@ static NCResult _nip44DecryptCompleteCore(
if ((state->_flags & NC_UTIL_CIPHER_MAC_NO_VERIFY) == 0)
{
DEBUG_ASSERT(ncSpanGetSizeC(macValue) == NC_ENCRYPTION_MAC_SIZE);
- DEBUG_ASSERT(ncSpanGetSizeC(macData) > NC_ENCRYPTION_NONCE_SIZE + MIN_PADDING_SIZE);
+ DEBUG_ASSERT(ncSpanGetSizeC(macData) > NIP44_NONCE_SIZE + MIN_PADDING_SIZE);
/* Assign the mac data to the mac verify args */
macArgs.mac32 = ncSpanGetOffsetC(macValue, 0);
@@ -550,7 +562,7 @@ static NCResult _nip44DecryptCompleteCore(
DEBUG_ASSERT2(cipherText.size >= MIN_PADDING_SIZE, "Cipertext segment was parsed incorrectly. Too small");
- result = NCSetEncryptionData(
+ result = NCEncryptionSetData(
&encArgs,
ncSpanGetOffsetC(cipherText, 0),
ncSpanGetOffset(output, 0), /*decrypt ciphertext and write directly to the output buffer */
@@ -852,7 +864,7 @@ NC_EXPORT NCResult NCUtilCipherSetProperty(
CHECK_NULL_ARG(ctx, 0)
/* All other arguments are verified */
- return NCSetEncryptionPropertyEx(
+ return NCEncryptionSetPropertyEx(
&ctx->encArgs,
property,
value,
@@ -908,3 +920,16 @@ NC_EXPORT NCResult NC_CC NCUtilCipherUpdate(
return E_VERSION_NOT_SUPPORTED;
}
}
+
+NC_EXPORT NCResult NC_CC NCUtilCipherGetIvSize(const NCUtilCipherContext* encCtx)
+{
+ uint32_t ivSize;
+
+ CHECK_NULL_ARG(encCtx, 0);
+
+ ivSize = NCEncryptionGetIvSize(encCtx->encArgs.version);
+
+ return ivSize == 0
+ ? E_VERSION_NOT_SUPPORTED
+ : (NCResult)ivSize;
+}
generated by cgit (git 2.46.0) at 2024-10-01 19:33:14 +0000