77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/**
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* Adapted from https://github.com/Densaugeo/base64_arduino
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*/
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/**
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* Base64 encoding and decoding of strings. Uses '+' for 62, '\' for 63, '=' for padding
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* This has been modified to use '-' for 62, '_' for 63 as per the JWT specification
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*/
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#ifndef BASE64_H_INCLUDED
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#define BASE64_H_INCLUDED
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/* binary_to_base64:
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* Description:
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* Converts a single byte from a binary value to the corresponding base64 character
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* Parameters:
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* v - Byte to convert
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* Returns:
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* ascii code of base64 character. If byte is >= 64, then there is not corresponding base64 character
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* and 255 is returned
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*/
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unsigned char binary_to_base64(unsigned char v);
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/* base64_to_binary:
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* Description:
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* Converts a single byte from a base64 character to the corresponding binary value
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* Parameters:
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* c - Base64 character (as ascii code)
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* Returns:
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* 6-bit binary value
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*/
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unsigned char base64_to_binary(unsigned char v);
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/* encode_base64_length:
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* Description:
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* Calculates length of base64 string needed for a given number of binary bytes
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* Parameters:
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* input_length - Amount of binary data in bytes
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* Returns:
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* Number of base64 characters needed to encode input_length bytes of binary data
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*/
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unsigned int encode_base64_length(unsigned int input_length);
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/* decode_base64_length:
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* Description:
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* Calculates number of bytes of binary data in a base64 string
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* Parameters:
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* input - Base64-encoded null-terminated string
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* Returns:
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* Number of bytes of binary data in input
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*/
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unsigned int decode_base64_length(unsigned char input[]);
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/* encode_base64:
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* Description:
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* Converts an array of bytes to a base64 null-terminated string
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* Parameters:
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* input - Pointer to input data
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* input_length - Number of bytes to read from input pointer
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* output - Pointer to output string. Null terminator will be added automatically
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* Returns:
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* Length of encoded string in bytes (not including null terminator)
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*/
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unsigned int encode_base64(unsigned char input[], unsigned int input_length, unsigned char output[]);
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/* decode_base64:
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* Description:
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* Converts a base64 null-terminated string to an array of bytes
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* Parameters:
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* input - Pointer to input string
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* output - Pointer to output array
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* Returns:
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* Number of bytes in the decoded binary
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*/
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unsigned int decode_base64(unsigned char input[], unsigned char output[]);
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#endif // ifndef
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