diff options
| -rw-r--r-- | MdePkg/Include/Library/BaseLib.h | 56 | ||||
| -rw-r--r-- | MdePkg/Library/BaseLib/String.c | 331 |
2 files changed, 387 insertions, 0 deletions
diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h index c58e4b089d..9c42f82a7d 100644 --- a/MdePkg/Include/Library/BaseLib.h +++ b/MdePkg/Include/Library/BaseLib.h @@ -2761,6 +2761,62 @@ AsciiCharToUpper ( );
/**
+ Convert binary data to a Base64 encoded ascii string based on RFC4648.
+
+ Produce a Null-terminated Ascii string in the output buffer specified by Destination and DestinationSize.
+ The Ascii string is produced by converting the data string specified by Source and SourceLength.
+
+ @param Source Input UINT8 data
+ @param SourceLength Number of UINT8 bytes of data
+ @param Destination Pointer to output string buffer
+ @param DestinationSize Size of ascii buffer. Set to 0 to get the size needed.
+ Caller is responsible for passing in buffer of DestinationSize
+
+ @retval RETURN_SUCCESS When ascii buffer is filled in.
+ @retval RETURN_INVALID_PARAMETER If Source is NULL or DestinationSize is NULL.
+ @retval RETURN_INVALID_PARAMETER If SourceLength or DestinationSize is bigger than (MAX_ADDRESS - (UINTN)Destination).
+ @retval RETURN_BUFFER_TOO_SMALL If SourceLength is 0 and DestinationSize is <1.
+ @retval RETURN_BUFFER_TOO_SMALL If Destination is NULL or DestinationSize is smaller than required buffersize.
+
+**/
+RETURN_STATUS
+EFIAPI
+Base64Encode (
+ IN CONST UINT8 *Source,
+ IN UINTN SourceLength,
+ OUT CHAR8 *Destination OPTIONAL,
+ IN OUT UINTN *DestinationSize
+ );
+
+/**
+ Convert Base64 ascii string to binary data based on RFC4648.
+
+ Produce Null-terminated binary data in the output buffer specified by Destination and DestinationSize.
+ The binary data is produced by converting the Base64 ascii string specified by Source and SourceLength.
+
+ @param Source Input ASCII characters
+ @param SourceLength Number of ASCII characters
+ @param Destination Pointer to output buffer
+ @param DestinationSize Caller is responsible for passing in buffer of at least DestinationSize.
+ Set 0 to get the size needed. Set to bytes stored on return.
+
+ @retval RETURN_SUCCESS When binary buffer is filled in.
+ @retval RETURN_INVALID_PARAMETER If Source is NULL or DestinationSize is NULL.
+ @retval RETURN_INVALID_PARAMETER If SourceLength or DestinationSize is bigger than (MAX_ADDRESS -(UINTN)Destination ).
+ @retval RETURN_INVALID_PARAMETER If there is any invalid character in input stream.
+ @retval RETURN_BUFFER_TOO_SMALL If buffer length is smaller than required buffer size.
+
+ **/
+RETURN_STATUS
+EFIAPI
+Base64Decode (
+ IN CONST CHAR8 *Source,
+ IN UINTN SourceLength,
+ OUT UINT8 *Destination OPTIONAL,
+ IN OUT UINTN *DestinationSize
+ );
+
+/**
Converts an 8-bit value to an 8-bit BCD value.
Converts the 8-bit value specified by Value to BCD. The BCD value is
diff --git a/MdePkg/Library/BaseLib/String.c b/MdePkg/Library/BaseLib/String.c index 467d91069d..53ff730e9e 100644 --- a/MdePkg/Library/BaseLib/String.c +++ b/MdePkg/Library/BaseLib/String.c @@ -1763,6 +1763,337 @@ AsciiStrToUnicodeStr ( #endif
+//
+// The basis for Base64 encoding is RFC 4686 https://tools.ietf.org/html/rfc4648
+//
+// RFC 4686 has a number of MAY and SHOULD cases. This implementation chooses
+// the more restrictive versions for security concerns (see RFC 4686 section 3.3).
+//
+// A invalid character, if encountered during the decode operation, causes the data
+// to be rejected. In addition, the '=' padding character is only allowed at the end
+// of the Base64 encoded string.
+//
+#define BAD_V 99
+
+STATIC CHAR8 EncodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789+/";
+
+STATIC UINT8 DecodingTable[] = {
+ //
+ // Valid characters ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
+ // Also, set '=' as a zero for decoding
+ // 0 , 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // 0
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // 10
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, 62, BAD_V, BAD_V, BAD_V, 63, // 20
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, BAD_V, BAD_V, BAD_V, 0, BAD_V, BAD_V, // 30
+ BAD_V, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 40
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // 50
+ BAD_V, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 60
+ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // 70
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // 80
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // 90
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // a0
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // b0
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // c0
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // d0
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, // d0
+ BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V, BAD_V // f0
+};
+
+/**
+ Convert binary data to a Base64 encoded ascii string based on RFC4648.
+
+ Produce a Null-terminated Ascii string in the output buffer specified by Destination and DestinationSize.
+ The Ascii string is produced by converting the data string specified by Source and SourceLength.
+
+ @param Source Input UINT8 data
+ @param SourceLength Number of UINT8 bytes of data
+ @param Destination Pointer to output string buffer
+ @param DestinationSize Size of ascii buffer. Set to 0 to get the size needed.
+ Caller is responsible for passing in buffer of DestinationSize
+
+ @retval RETURN_SUCCESS When ascii buffer is filled in.
+ @retval RETURN_INVALID_PARAMETER If Source is NULL or DestinationSize is NULL.
+ @retval RETURN_INVALID_PARAMETER If SourceLength or DestinationSize is bigger than (MAX_ADDRESS - (UINTN)Destination).
+ @retval RETURN_BUFFER_TOO_SMALL If SourceLength is 0 and DestinationSize is <1.
+ @retval RETURN_BUFFER_TOO_SMALL If Destination is NULL or DestinationSize is smaller than required buffersize.
+
+**/
+RETURN_STATUS
+EFIAPI
+Base64Encode (
+ IN CONST UINT8 *Source,
+ IN UINTN SourceLength,
+ OUT CHAR8 *Destination OPTIONAL,
+ IN OUT UINTN *DestinationSize
+ )
+{
+
+ UINTN RequiredSize;
+ UINTN Left;
+
+ //
+ // Check pointers, and SourceLength is valid
+ //
+ if ((Source == NULL) || (DestinationSize == NULL)) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ //
+ // Allow for RFC 4648 test vector 1
+ //
+ if (SourceLength == 0) {
+ if (*DestinationSize < 1) {
+ *DestinationSize = 1;
+ return RETURN_BUFFER_TOO_SMALL;
+ }
+ *DestinationSize = 1;
+ *Destination = '\0';
+ return RETURN_SUCCESS;
+ }
+
+ //
+ // Check if SourceLength or DestinationSize is valid
+ //
+ if ((SourceLength >= (MAX_ADDRESS - (UINTN)Source)) || (*DestinationSize >= (MAX_ADDRESS - (UINTN)Destination))){
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ //
+ // 4 ascii per 3 bytes + NULL
+ //
+ RequiredSize = ((SourceLength + 2) / 3) * 4 + 1;
+ if ((Destination == NULL) || *DestinationSize < RequiredSize) {
+ *DestinationSize = RequiredSize;
+ return RETURN_BUFFER_TOO_SMALL;
+ }
+
+ Left = SourceLength;
+
+ //
+ // Encode 24 bits (three bytes) into 4 ascii characters
+ //
+ while (Left >= 3) {
+
+ *Destination++ = EncodingTable[( Source[0] & 0xfc) >> 2 ];
+ *Destination++ = EncodingTable[((Source[0] & 0x03) << 4) + ((Source[1] & 0xf0) >> 4)];
+ *Destination++ = EncodingTable[((Source[1] & 0x0f) << 2) + ((Source[2] & 0xc0) >> 6)];
+ *Destination++ = EncodingTable[( Source[2] & 0x3f)];
+ Left -= 3;
+ Source += 3;
+ }
+
+ //
+ // Handle the remainder, and add padding '=' characters as necessary.
+ //
+ switch (Left) {
+ case 0:
+
+ //
+ // No bytes Left, done.
+ //
+ break;
+ case 1:
+
+ //
+ // One more data byte, two pad characters
+ //
+ *Destination++ = EncodingTable[( Source[0] & 0xfc) >> 2];
+ *Destination++ = EncodingTable[((Source[0] & 0x03) << 4)];
+ *Destination++ = '=';
+ *Destination++ = '=';
+ break;
+ case 2:
+
+ //
+ // Two more data bytes, and one pad character
+ //
+ *Destination++ = EncodingTable[( Source[0] & 0xfc) >> 2];
+ *Destination++ = EncodingTable[((Source[0] & 0x03) << 4) + ((Source[1] & 0xf0) >> 4)];
+ *Destination++ = EncodingTable[((Source[1] & 0x0f) << 2)];
+ *Destination++ = '=';
+ break;
+ }
+ //
+ // Add terminating NULL
+ //
+ *Destination = '\0';
+ return RETURN_SUCCESS;
+}
+
+/**
+ Convert Base64 ascii string to binary data based on RFC4648.
+
+ Produce Null-terminated binary data in the output buffer specified by Destination and DestinationSize.
+ The binary data is produced by converting the Base64 ascii string specified by Source and SourceLength.
+
+ @param Source Input ASCII characters
+ @param SourceLength Number of ASCII characters
+ @param Destination Pointer to output buffer
+ @param DestinationSize Caller is responsible for passing in buffer of at least DestinationSize.
+ Set 0 to get the size needed. Set to bytes stored on return.
+
+ @retval RETURN_SUCCESS When binary buffer is filled in.
+ @retval RETURN_INVALID_PARAMETER If Source is NULL or DestinationSize is NULL.
+ @retval RETURN_INVALID_PARAMETER If SourceLength or DestinationSize is bigger than (MAX_ADDRESS -(UINTN)Destination ).
+ @retval RETURN_INVALID_PARAMETER If there is any invalid character in input stream.
+ @retval RETURN_BUFFER_TOO_SMALL If buffer length is smaller than required buffer size.
+ **/
+RETURN_STATUS
+EFIAPI
+Base64Decode (
+ IN CONST CHAR8 *Source,
+ IN UINTN SourceLength,
+ OUT UINT8 *Destination OPTIONAL,
+ IN OUT UINTN *DestinationSize
+ )
+{
+
+ UINT32 Value;
+ CHAR8 Chr;
+ INTN BufferSize;
+ UINTN SourceIndex;
+ UINTN DestinationIndex;
+ UINTN Index;
+ UINTN ActualSourceLength;
+
+ //
+ // Check pointers are not NULL
+ //
+ if ((Source == NULL) || (DestinationSize == NULL)) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ //
+ // Check if SourceLength or DestinationSize is valid
+ //
+ if ((SourceLength >= (MAX_ADDRESS - (UINTN)Source)) || (*DestinationSize >= (MAX_ADDRESS - (UINTN)Destination))){
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ ActualSourceLength = 0;
+ BufferSize = 0;
+
+ //
+ // Determine the actual number of valid characters in the string.
+ // All invalid characters except selected white space characters,
+ // will cause the Base64 string to be rejected. White space to allow
+ // properly formatted XML will be ignored.
+ //
+ // See section 3.3 of RFC 4648.
+ //
+ for (SourceIndex = 0; SourceIndex < SourceLength; SourceIndex++) {
+
+ //
+ // '=' is part of the quantum
+ //
+ if (Source[SourceIndex] == '=') {
+ ActualSourceLength++;
+ BufferSize--;
+
+ //
+ // Only two '=' characters can be valid.
+ //
+ if (BufferSize < -2) {
+ return RETURN_INVALID_PARAMETER;
+ }
+ }
+ else {
+ Chr = Source[SourceIndex];
+ if (BAD_V != DecodingTable[(UINT8) Chr]) {
+
+ //
+ // The '=' characters are only valid at the end, so any
+ // valid character after an '=', will be flagged as an error.
+ //
+ if (BufferSize < 0) {
+ return RETURN_INVALID_PARAMETER;
+ }
+ ActualSourceLength++;
+ }
+ else {
+
+ //
+ // The reset of the decoder will ignore all invalid characters allowed here.
+ // Ignoring selected white space is useful. In this case, the decoder will
+ // ignore ' ', '\t', '\n', and '\r'.
+ //
+ if ((Chr != ' ') &&(Chr != '\t') &&(Chr != '\n') &&(Chr != '\r')) {
+ return RETURN_INVALID_PARAMETER;
+ }
+ }
+ }
+ }
+
+ //
+ // The Base64 character string must be a multiple of 4 character quantums.
+ //
+ if (ActualSourceLength % 4 != 0) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ BufferSize += ActualSourceLength / 4 * 3;
+ if (BufferSize < 0) {
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ //
+ // BufferSize is >= 0
+ //
+ if ((Destination == NULL) || (*DestinationSize < (UINTN) BufferSize)) {
+ *DestinationSize = BufferSize;
+ return RETURN_BUFFER_TOO_SMALL;
+ }
+
+ //
+ // If no decodable characters, return a size of zero. RFC 4686 test vector 1.
+ //
+ if (ActualSourceLength == 0) {
+ *DestinationSize = 0;
+ return RETURN_SUCCESS;
+ }
+
+ //
+ // Input data is verified to be a multiple of 4 valid charcters. Process four
+ // characters at a time. Uncounted (ie. invalid) characters will be ignored.
+ //
+ for (SourceIndex = 0, DestinationIndex = 0; (SourceIndex < SourceLength) && (DestinationIndex < *DestinationSize); ) {
+ Value = 0;
+
+ //
+ // Get 24 bits of data from 4 input characters, each character representing 6 bits
+ //
+ for (Index = 0; Index < 4; Index++) {
+ do {
+ Chr = DecodingTable[(UINT8) Source[SourceIndex++]];
+ } while (Chr == BAD_V);
+ Value <<= 6;
+ Value |= Chr;
+ }
+
+ //
+ // Store 3 bytes of binary data (24 bits)
+ //
+ *Destination++ = (UINT8) (Value >> 16);
+ DestinationIndex++;
+
+ //
+ // Due to the '=' special cases for the two bytes at the end,
+ // we have to check the length and not store the padding data
+ //
+ if (DestinationIndex++ < *DestinationSize) {
+ *Destination++ = (UINT8) (Value >> 8);
+ }
+ if (DestinationIndex++ < *DestinationSize) {
+ *Destination++ = (UINT8) Value;
+ }
+ }
+
+ return RETURN_SUCCESS;
+}
+
/**
Converts an 8-bit value to an 8-bit BCD value.
|