Visual FoxPro

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. Visual FoxPro

LOCAL lnSuccess
LOCAL loHttp
LOCAL loSbJwkSet
LOCAL loJwkSet
LOCAL loJwk
LOCAL lnNumKeys
LOCAL i

lnSuccess = 0

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

loHttp = CreateObject('Chilkat.Http')

* I put a sample JWK set at this URL: https://www.chilkatsoft.com/data/jwk-set.json
* You can test this example with it.
loSbJwkSet = CreateObject('Chilkat.StringBuilder')
lnSuccess = loHttp.QuickGetSb("https://www.chilkatsoft.com/data/jwk-set.json",loSbJwkSet)
IF (lnSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    RELEASE loSbJwkSet
    CANCEL
ENDIF

* Load the JWK into a JSON object..
loJwkSet = CreateObject('Chilkat.JsonObject')
loJwkSet.LoadSb(loSbJwkSet)
loJwkSet.EmitCompact = 0
? "The full JWK Key Set:"
? loJwkSet.Emit()

* Iterate over each key...
loJwk = CreateObject('Chilkat.JsonObject')
lnNumKeys = loJwkSet.SizeOfArray("keys")
i = 0
DO WHILE i < lnNumKeys
    loJwkSet.I = i
    ? "---- JWK " + STR(i) + " ----"

    loJwkSet.ObjectOf2("keys[i]",loJwk)

    loJwk.EmitCompact = 0
    ? loJwk.Emit()
    i = i + 1
ENDDO

* 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"
* }
* 

RELEASE loHttp
RELEASE loSbJwkSet
RELEASE loJwkSet
RELEASE loJwk