Encode and decode JWT tokens. Lightweight and no need to external library, suitable for using in microcontrollers.
At this moment, only HS256 algorithm supported.
char *data = "{\"uname\":\"user\"}";
char *key = "secretkey";
char *token;
token = jwt_encode(data, strlen(data), key, strlen(key));
/* your codes ... */
free(token)For compile and run example:
cd example
cmake .
make
./examplechar data[100];
JWTDecode decode_result;
char *key = "secretkey";
decode_result = jwt_decode(token, strlen(token),
key, strlen(key),
data, sizeof(data));decode_result is a typedef in jwt.h file:
typedef enum {
JWTDecode_Verified = 0, // Everything is fine
JWTDecode_NotVerified = -1, // Signture verification failed
JWTDecode_BadToken = -2, // Bad JWT Token
JWTDecode_NoBufSpace = -3 // No input buffer space to copy decoded payload
} JWTDecode;jwt_decode output explaination:
-
JWTDecode_Verified: Token signture verified successfully and data copied to given buffer. -
JWTDecode_NotVerified: Token signture is wrong, but data copied to given buffer. -
JWTDecode_BadToken: Given token is not in JWT format. -
JWTDecode_NoBufSpace: No enough space to copy token's payload data
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