Objective-C

How to Load a JWK Set Published at a Remote URL

See more JSON Web Signatures (JWS) Examples

Demonstrates how to load a JWK set published at a remote URL. In general, this example can fetch any JSON, or any text (non-binary) document from a remote URL. It uses the Chilkat HTTP API to do it. Objective-C

#import <CkoHttp.h>
#import <CkoStringBuilder.h>
#import <CkoJsonObject.h>

BOOL success = NO;

//  This example assumes the Chilkat HTTP API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

CkoHttp *http = [[CkoHttp alloc] init];

//  I put a sample JWK set at this URL: https://www.chilkatsoft.com/data/jwk-set.json
//  You can test this example with it.
CkoStringBuilder *sbJwkSet = [[CkoStringBuilder alloc] init];
success = [http QuickGetSb: @"https://www.chilkatsoft.com/data/jwk-set.json" sbContent: sbJwkSet];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

//  Load the JWK into a JSON object..
CkoJsonObject *jwkSet = [[CkoJsonObject alloc] init];
[jwkSet LoadSb: sbJwkSet];
jwkSet.EmitCompact = NO;
NSLog(@"%@",@"The full JWK Key Set:");
NSLog(@"%@",[jwkSet Emit]);

//  Iterate over each key...
CkoJsonObject *jwk = [[CkoJsonObject alloc] init];
int numKeys = [[jwkSet SizeOfArray: @"keys"] intValue];
int i = 0;
while (i < numKeys) {
    jwkSet.I = [NSNumber numberWithInt: i];
    NSLog(@"%@%d%@",@"---- JWK ",i,@" ----");

    [jwkSet ObjectOf2: @"keys[i]" jsonObj: jwk];

    jwk.EmitCompact = NO;
    NSLog(@"%@",[jwk Emit]);
    i = i + 1;
}

//  Output:

//  The full JWK Key Set:
//  { 
//    "keys": [
//      { 
//        "kty": "EC",
//        "crv": "P-256",
//        "x": "MKBCTNIcKUSDii11ySs3526iDZ8AiTo7Tu6KPAqv7D4",
//        "y": "4Etl6SRW2YiLUrN5vfvVHuhp7x8PxltmWWlbbM4IFyM",
//        "d": "870MB6gfuTJ4HtUnUvYMyJpr5eUZNP4Bk43bVdj3eAE",
//        "use": "enc",
//        "kid": "1"
//      },
//      { 
//        "kty": "RSA",
//        "n": "0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx4
//  cbbfAAtVT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMst
//  n64tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FDW2Q
//  vzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n91CbOpbIS
//  D08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINHaQ-G_xBniIqbw
//  0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw",
//        "e": "AQAB",
//        "d": "X4cTteJY_gn4FYPsXB8rdXix5vwsg1FLN5E3EaG6RJoVH-HLLKD9
//  M7dx5oo7GURknchnrRweUkC7hT5fJLM0WbFAKNLWY2vv7B6NqXSzUvxT0_YSfqij
//  wp3RTzlBaCxWp4doFk5N2o8Gy_nHNKroADIkJ46pRUohsXywbReAdYaMwFs9tv8d
//  _cPVY3i07a3t8MN6TNwm0dSawm9v47UiCl3Sk5ZiG7xojPLu4sbg1U2jx4IBTNBz
//  nbJSzFHK66jT8bgkuqsk0GjskDJk19Z4qwjwbsnn4j2WBii3RL-Us2lGVkY8fkFz
//  me1z0HbIkfz0Y6mqnOYtqc0X4jfcKoAC8Q",
//        "p": "83i-7IvMGXoMXCskv73TKr8637FiO7Z27zv8oj6pbWUQyLPQBQxtPV
//  nwD20R-60eTDmD2ujnMt5PoqMrm8RfmNhVWDtjjMmCMjOpSXicFHj7XOuVIYQyqV
//  WlWEh6dN36GVZYk93N8Bc9vY41xy8B9RzzOGVQzXvNEvn7O0nVbfs",
//        "q": "3dfOR9cuYq-0S-mkFLzgItgMEfFzB2q3hWehMuG0oCuqnb3vobLyum
//  qjVZQO1dIrdwgTnCdpYzBcOfW5r370AFXjiWft_NGEiovonizhKpo9VVS78TzFgx
//  kIdrecRezsZ-1kYd_s1qDbxtkDEgfAITAG9LUnADun4vIcb6yelxk",
//        "dp": "G4sPXkc6Ya9y8oJW9_ILj4xuppu0lzi_H7VTkS8xj5SdX3coE0oim
//  YwxIi2emTAue0UOa5dpgFGyBJ4c8tQ2VF402XRugKDTP8akYhFo5tAA77Qe_Nmtu
//  YZc3C3m3I24G2GvR5sSDxUyAN2zq8Lfn9EUms6rY3Ob8YeiKkTiBj0",
//        "dq": "s9lAH9fggBsoFR8Oac2R_E2gw282rT2kGOAhvIllETE1efrA6huUU
//  vMfBcMpn8lqeW6vzznYY5SSQF7pMdC_agI3nG8Ibp1BUb0JUiraRNqUfLhcQb_d9
//  GF4Dh7e74WbRsobRonujTYN1xCaP6TO61jvWrX-L18txXw494Q_cgk",
//        "qi": "GyM_p6JrXySiz1toFgKbWV-JdI3jQ4ypu9rbMWx3rQJBfmt0FoYzg
//  UIZEVFEcOqwemRN81zoDAaa-Bk0KWNGDjJHZDdDmFhW3AN7lI-puxk_mHZGJ11rx
//  yR8O55XLSe3SPmRfKwZI6yU24ZxvQKFYItdldUKGzO6Ia6zTKhAVRU",
//        "alg": "RS256",
//        "kid": "2011-04-29"
//      },
//      { 
//        "kty": "oct",
//        "alg": "A128KW",
//        "k": "GawgguFyGrWKav7AX4VKUg",
//        "kid": "AES KEK"
//      },
//      { 
//        "kty": "oct",
//        "k": "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75
//  aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow",
//        "kid": "HMAC key used in JWS spec Appendix A.1 example"
//      }
//    ]
//  }
//  
//  ---- JWK 0 ----
//  { 
//    "kty": "EC",
//    "crv": "P-256",
//    "x": "MKBCTNIcKUSDii11ySs3526iDZ8AiTo7Tu6KPAqv7D4",
//    "y": "4Etl6SRW2YiLUrN5vfvVHuhp7x8PxltmWWlbbM4IFyM",
//    "d": "870MB6gfuTJ4HtUnUvYMyJpr5eUZNP4Bk43bVdj3eAE",
//    "use": "enc",
//    "kid": "1"
//  }
//  
//  ---- JWK 1 ----
//  { 
//    "kty": "RSA",
//    "n": "0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx4
//  cbbfAAtVT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMst
//  n64tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FDW2Q
//  vzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n91CbOpbIS
//  D08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINHaQ-G_xBniIqbw
//  0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw",
//    "e": "AQAB",
//    "d": "X4cTteJY_gn4FYPsXB8rdXix5vwsg1FLN5E3EaG6RJoVH-HLLKD9
//  M7dx5oo7GURknchnrRweUkC7hT5fJLM0WbFAKNLWY2vv7B6NqXSzUvxT0_YSfqij
//  wp3RTzlBaCxWp4doFk5N2o8Gy_nHNKroADIkJ46pRUohsXywbReAdYaMwFs9tv8d
//  _cPVY3i07a3t8MN6TNwm0dSawm9v47UiCl3Sk5ZiG7xojPLu4sbg1U2jx4IBTNBz
//  nbJSzFHK66jT8bgkuqsk0GjskDJk19Z4qwjwbsnn4j2WBii3RL-Us2lGVkY8fkFz
//  me1z0HbIkfz0Y6mqnOYtqc0X4jfcKoAC8Q",
//    "p": "83i-7IvMGXoMXCskv73TKr8637FiO7Z27zv8oj6pbWUQyLPQBQxtPV
//  nwD20R-60eTDmD2ujnMt5PoqMrm8RfmNhVWDtjjMmCMjOpSXicFHj7XOuVIYQyqV
//  WlWEh6dN36GVZYk93N8Bc9vY41xy8B9RzzOGVQzXvNEvn7O0nVbfs",
//    "q": "3dfOR9cuYq-0S-mkFLzgItgMEfFzB2q3hWehMuG0oCuqnb3vobLyum
//  qjVZQO1dIrdwgTnCdpYzBcOfW5r370AFXjiWft_NGEiovonizhKpo9VVS78TzFgx
//  kIdrecRezsZ-1kYd_s1qDbxtkDEgfAITAG9LUnADun4vIcb6yelxk",
//    "dp": "G4sPXkc6Ya9y8oJW9_ILj4xuppu0lzi_H7VTkS8xj5SdX3coE0oim
//  YwxIi2emTAue0UOa5dpgFGyBJ4c8tQ2VF402XRugKDTP8akYhFo5tAA77Qe_Nmtu
//  YZc3C3m3I24G2GvR5sSDxUyAN2zq8Lfn9EUms6rY3Ob8YeiKkTiBj0",
//    "dq": "s9lAH9fggBsoFR8Oac2R_E2gw282rT2kGOAhvIllETE1efrA6huUU
//  vMfBcMpn8lqeW6vzznYY5SSQF7pMdC_agI3nG8Ibp1BUb0JUiraRNqUfLhcQb_d9
//  GF4Dh7e74WbRsobRonujTYN1xCaP6TO61jvWrX-L18txXw494Q_cgk",
//    "qi": "GyM_p6JrXySiz1toFgKbWV-JdI3jQ4ypu9rbMWx3rQJBfmt0FoYzg
//  UIZEVFEcOqwemRN81zoDAaa-Bk0KWNGDjJHZDdDmFhW3AN7lI-puxk_mHZGJ11rx
//  yR8O55XLSe3SPmRfKwZI6yU24ZxvQKFYItdldUKGzO6Ia6zTKhAVRU",
//    "alg": "RS256",
//    "kid": "2011-04-29"
//  }
//  
//  ---- JWK 2 ----
//  { 
//    "kty": "oct",
//    "alg": "A128KW",
//    "k": "GawgguFyGrWKav7AX4VKUg",
//    "kid": "AES KEK"
//  }
//  
//  ---- JWK 3 ----
//  { 
//    "kty": "oct",
//    "k": "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75
//  aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow",
//    "kid": "HMAC key used in JWS spec Appendix A.1 example"
//  }
//