From 1f7af69d10fa3c88e996d38179d5f985f6c7dfe5 Mon Sep 17 00:00:00 2001 From: Mike Turner Date: Fri, 28 Dec 2018 16:00:02 +0800 Subject: MdePkg/BaseLib: Add Base64Encode() and Base64Decode() Introduce public functions Base64Encode and Base64Decode. https://bugzilla.tianocore.org/show_bug.cgi?id=1370 v2:1.Remove some white space. 2.Add unit test with test vectors in RFC 4648. https://github.com/shenglei10/edk2/tree/encode_test https://github.com/shenglei10/edk2/tree/decode_test v3:1.Align white space. 2.Update comments of Base64Encode and Base64Decode. 3.Change the use of macro RETURN_DEVICE_ERROR to RETURN_INVALID_PARAMETER in string.c. v4:Change parameters' names. v5:1.Update usage of variables. 2.Remove debug message in Base64Decode(). Cc: Michael D Kinney Cc: Liming Gao Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Shenglei Zhang Reviewed-by: Ray Ni Reviewed-by: Liming Gao --- MdePkg/Include/Library/BaseLib.h | 56 +++++++ MdePkg/Library/BaseLib/String.c | 331 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 387 insertions(+) diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h index c58e4b0..9c42f82 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 467d910..53ff730 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. -- cgit v1.1