#include "Digest.h"
#include "SecDigestTransform.h"
#include "Utilities.h"
Digest::Digest(CFStringRef digestType, size_t digestLength) : mDigestType(digestType), mDigestLength(digestLength)
{
}
Digest::~Digest()
{
}
int Digest::LengthForType(CFStringRef type)
{
if (!CFStringCompare(kSecDigestSHA1, type, kCFCompareAnchored)) {
return CC_SHA1_DIGEST_LENGTH;
} else if (!CFStringCompare(kSecDigestSHA2, type, kCFCompareAnchored)) {
return CC_SHA256_DIGEST_LENGTH;
} else if (!CFStringCompare(kSecDigestMD2, type, kCFCompareAnchored)) {
return CC_MD2_DIGEST_LENGTH;
} else if (!CFStringCompare(kSecDigestMD4, type, kCFCompareAnchored)) {
return CC_MD4_DIGEST_LENGTH;
} else if (!CFStringCompare(kSecDigestMD5, type, kCFCompareAnchored)) {
return CC_MD5_DIGEST_LENGTH;
} else {
return transforms_assume(type == CFSTR("A supported digest type"));
}
}
CFDictionaryRef Digest::CopyState()
{
CFMutableDictionaryRef dr = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CFDictionaryAddValue(dr, kSecDigestTypeAttribute, mDigestType);
CFIndex size = mDigestLength;
CFNumberRef nr = CFNumberCreate(NULL, kCFNumberCFIndexType, &size);
CFDictionaryAddValue(dr, kSecDigestLengthAttribute, nr);
CFRelease(nr);
return dr;
}
MD2Digest::MD2Digest() : Digest(kSecDigestMD2, CC_MD2_DIGEST_LENGTH)
{
CC_MD2_Init(&mContext);
}
void MD2Digest::Update(const void* buffer, size_t length)
{
CC_MD2_Update(&mContext, buffer, (CC_LONG)length);
}
size_t MD2Digest::DigestLength()
{
return CC_MD2_DIGEST_LENGTH;
}
const void* MD2Digest::Finalize()
{
CC_MD2_Final(mDigestBuffer, &mContext);
return mDigestBuffer;
}
MD4Digest::MD4Digest() : Digest(kSecDigestMD4, CC_MD4_DIGEST_LENGTH)
{
CC_MD4_Init(&mContext);
}
void MD4Digest::Update(const void* buffer, size_t length)
{
CC_MD4_Update(&mContext, buffer, (CC_LONG)length);
}
size_t MD4Digest::DigestLength()
{
return CC_MD4_DIGEST_LENGTH;
}
const void* MD4Digest::Finalize()
{
CC_MD4_Final(mDigestBuffer, &mContext);
return mDigestBuffer;
}
MD5Digest::MD5Digest() : Digest(kSecDigestMD5, CC_MD5_DIGEST_LENGTH)
{
CC_MD5_Init(&mContext);
}
void MD5Digest::Update(const void* buffer, size_t length)
{
CC_MD5_Update(&mContext, buffer, (CC_LONG)length);
}
size_t MD5Digest::DigestLength()
{
return CC_MD5_DIGEST_LENGTH;
}
const void* MD5Digest::Finalize()
{
CC_MD5_Final(mDigestBuffer, &mContext);
return mDigestBuffer;
}
SHA1Digest::SHA1Digest() : Digest(kSecDigestSHA1, CC_SHA1_DIGEST_LENGTH)
{
CC_SHA1_Init(&mContext);
}
void SHA1Digest::Update(const void* buffer, size_t length)
{
CC_SHA1_Update(&mContext, buffer, (CC_LONG)length);
}
size_t SHA1Digest::DigestLength()
{
return CC_SHA1_DIGEST_LENGTH;
}
const void* SHA1Digest::Finalize()
{
CC_SHA1_Final(mDigestBuffer, &mContext);
return mDigestBuffer;
}
SHA256Digest::SHA256Digest() : Digest(kSecDigestSHA2, CC_SHA256_DIGEST_LENGTH)
{
CC_SHA256_Init(&mContext);
}
void SHA256Digest::Update(const void* buffer, size_t length)
{
CC_SHA256_Update(&mContext, buffer, (CC_LONG)length);
}
size_t SHA256Digest::DigestLength()
{
return CC_SHA256_DIGEST_LENGTH;
}
const void* SHA256Digest::Finalize()
{
CC_SHA256_Final(mDigestBuffer, &mContext);
return mDigestBuffer;
}
SHA224Digest::SHA224Digest() : Digest(kSecDigestSHA2, CC_SHA224_DIGEST_LENGTH)
{
CC_SHA224_Init(&mContext);
}
void SHA224Digest::Update(const void* buffer, size_t length)
{
CC_SHA224_Update(&mContext, buffer, (CC_LONG)length);
}
size_t SHA224Digest::DigestLength()
{
return CC_SHA224_DIGEST_LENGTH;
}
const void* SHA224Digest::Finalize()
{
CC_SHA224_Final(mDigestBuffer, &mContext);
return mDigestBuffer;
}
SHA512Digest::SHA512Digest() : Digest(kSecDigestSHA2, CC_SHA512_DIGEST_LENGTH)
{
CC_SHA512_Init(&mContext);
}
void SHA512Digest::Update(const void* buffer, size_t length)
{
CC_SHA512_Update(&mContext, buffer, (CC_LONG)length);
}
size_t SHA512Digest::DigestLength()
{
return CC_SHA512_DIGEST_LENGTH;
}
const void* SHA512Digest::Finalize()
{
CC_SHA512_Final(mDigestBuffer, &mContext);
return mDigestBuffer;
}
SHA384Digest::SHA384Digest() : Digest(kSecDigestSHA2, CC_SHA384_DIGEST_LENGTH)
{
CC_SHA384_Init(&mContext);
}
void SHA384Digest::Update(const void* buffer, size_t length)
{
CC_SHA384_Update(&mContext, buffer, (CC_LONG)length);
}
size_t SHA384Digest::DigestLength()
{
return CC_SHA384_DIGEST_LENGTH;
}
const void* SHA384Digest::Finalize()
{
CC_SHA384_Final(mDigestBuffer, &mContext);
return mDigestBuffer;
}
DigestTransform::DigestTransform() : Transform(CFSTR("Digest Transform"))
{
mDigest = NULL;
}
CFErrorRef DigestTransform::Setup(CFTypeRef dt, CFIndex length)
{
if (dt == NULL)
{
dt = kSecDigestSHA2;
length = 512;
}
transforms_assume_zero(mDigest);
CFStringRef digestType = (CFStringRef) dt;
if (CFStringCompare(digestType, kSecDigestMD2, 0) == kCFCompareEqualTo)
{
mDigest = new MD2Digest();
}
else if (CFStringCompare(digestType, kSecDigestMD4, 0) == kCFCompareEqualTo)
{
mDigest = new MD4Digest();
}
else if (CFStringCompare(digestType, kSecDigestMD5, 0) == kCFCompareEqualTo)
{
mDigest = new MD5Digest();
}
else if (CFStringCompare(digestType, kSecDigestSHA1, 0) == kCFCompareEqualTo)
{
mDigest = new SHA1Digest();
}
else if (CFStringCompare(digestType, kSecDigestSHA2, 0) == kCFCompareEqualTo)
{
switch (length)
{
case 224:
mDigest = new SHA224Digest();
break;
case 256:
mDigest = new SHA256Digest();
break;
case 384:
mDigest = new SHA384Digest();
break;
case 0:
case 512:
mDigest = new SHA512Digest();
break;
default:
{
CFErrorRef result = CreateSecTransformErrorRef(kSecTransformErrorInvalidLength, "%d is an invalid digest size (use 224, 256, 384, 512, or 0).", length);
return result;
}
}
}
else
{
if (CFStringCompare(digestType, kSecDigestHMACMD5, 0) == kCFCompareEqualTo)
{
mDigest = new Hmac(this, digestType, kCCHmacAlgMD5, CC_MD5_DIGEST_LENGTH);
}
else if (CFStringCompare(digestType, kSecDigestHMACSHA1, 0) == kCFCompareEqualTo)
{
mDigest = new Hmac(this, digestType, kCCHmacAlgSHA1, CC_SHA1_DIGEST_LENGTH);
}
else if (CFStringCompare(digestType, kSecDigestHMACSHA2, 0) == kCFCompareEqualTo)
{
switch (length)
{
case 224:
{
mDigest = new Hmac(this, digestType, kCCHmacAlgSHA224, CC_SHA224_DIGEST_LENGTH);
}
break;
case 256:
{
mDigest = new Hmac(this, digestType, kCCHmacAlgSHA256, CC_SHA256_DIGEST_LENGTH);
}
break;
case 384:
{
mDigest = new Hmac(this, digestType, kCCHmacAlgSHA384, CC_SHA384_DIGEST_LENGTH);
}
break;
case 0:
case 512:
{
mDigest = new Hmac(this, digestType, kCCHmacAlgSHA512, CC_SHA512_DIGEST_LENGTH);
}
break;
default:
{
CFErrorRef result = CreateSecTransformErrorRef(kSecTransformErrorInvalidLength, "%d is an invalid digest size (use 224, 256, 384, 512, or 0).", length);
return result;
}
}
}
else
{
CFErrorRef result = CreateSecTransformErrorRef(kSecTransformErrorInvalidAlgorithm, "%@ is not a supported digest algorithm (use kSecDigestSHA2, kSecDigestMD2, kSecDigestMD5, kSecDigestSHA or kSecDigestSHA2", digestType);
return result;
}
}
long lengthInt = mDigest->DigestLength();
CFNumberRef lengthNumber = CFNumberCreate(NULL, kCFNumberLongType, &lengthInt);
SendAttribute(kSecDigestLengthAttribute, lengthNumber);
CFRelease(lengthNumber);
return NULL;
}
static CFStringRef gDigestTransformName = CFSTR("SecDigestTransform");
CFTypeRef DigestTransform::Make()
{
DigestTransform* dt = new DigestTransform();
return CoreFoundationHolder::MakeHolder(gDigestTransformName, dt);
}
DigestTransform::~DigestTransform()
{
if (mDigest != NULL)
{
delete mDigest;
}
}
void DigestTransform::AttributeChanged(CFStringRef name, CFTypeRef value)
{
if (CFStringCompare(name, kSecTransformInputAttributeName, 0) == kCFCompareEqualTo)
{
if (value == NULL)
{
const void* result = mDigest->Finalize();
CFDataRef resultRef = CFDataCreate(NULL, (UInt8*) result, mDigest->DigestLength());
SendAttribute(kSecTransformOutputAttributeName, resultRef);
CFRelease(resultRef);
SendAttribute(kSecTransformOutputAttributeName, NULL);
}
else
{
CFTypeID valueType = CFGetTypeID(value);
if (valueType == CFErrorGetTypeID())
{
SendAttribute(kSecTransformOutputAttributeName, value);
}
else if (valueType != CFDataGetTypeID())
{
CFStringRef idType = CFCopyTypeIDDescription(valueType);
CFErrorRef result = CreateSecTransformErrorRef(kSecTransformErrorInvalidType, "value is not a CFDataRef -- it's a %@ instead", idType);
CFRelease(idType);
SetAttributeNoCallback(kSecTransformOutputAttributeName, result);
}
else
{
CFDataRef valueRef = (CFDataRef) value;
mDigest->Update(CFDataGetBytePtr(valueRef), CFDataGetLength(valueRef));
}
}
}
}
class DigestTransformFactory : public TransformFactory
{
public:
DigestTransformFactory();
virtual CFTypeRef Make();
};
DigestTransformFactory::DigestTransformFactory() : TransformFactory(gDigestTransformName, true)
{
}
CFTypeRef DigestTransformFactory::Make()
{
return DigestTransform::Make();
}
TransformFactory* DigestTransform::MakeTransformFactory()
{
return new DigestTransformFactory();
}
CFDictionaryRef DigestTransform::CopyState()
{
return mDigest->CopyState();
}
void DigestTransform::RestoreState(CFDictionaryRef state)
{
if (mDigest != NULL)
{
delete mDigest;
}
CFStringRef type = (CFStringRef) CFDictionaryGetValue(state, kSecDigestTypeAttribute);
CFNumberRef size = (CFNumberRef) CFDictionaryGetValue(state, kSecDigestLengthAttribute);
CFIndex realSize;
CFNumberGetValue(size, kCFNumberCFIndexType, &realSize);
Setup(type, realSize);
}
CFTypeID DigestTransform::GetCFTypeID()
{
return CoreFoundationObject::FindObjectType(gDigestTransformName);
}
Hmac::Hmac(Transform* parentTransform, CFStringRef digestType, CCHmacAlgorithm alg, size_t length) :
Digest(digestType, length), mInitialized(false), mParentTransform(parentTransform), mAlg(alg)
{
}
Hmac::~Hmac()
{
free(mDigestBuffer);
}
void Hmac::Initialize()
{
const UInt8* data = NULL;
size_t dataLength = 0;
CFDataRef key = (CFDataRef) mParentTransform->GetAttribute(kSecDigestHMACKeyAttribute);
if (key)
{
data = CFDataGetBytePtr(key);
dataLength = CFDataGetLength(key);
}
CCHmacInit(&mHMACContext, mAlg, data, dataLength);
mDigestBuffer = (UInt8*) malloc(mDigestLength);
mInitialized = true;
}
void Hmac::Update(const void* buffer, size_t length)
{
if (!mInitialized)
{
Initialize();
}
CCHmacUpdate(&mHMACContext, buffer, length);
}
size_t Hmac::DigestLength()
{
return mDigestLength;
}
const void* Hmac::Finalize()
{
CCHmacFinal(&mHMACContext, mDigestBuffer);
return mDigestBuffer;
}