openresty中使用私钥/公钥进行加密/解密/签名/验签。

对于公钥私钥的提取，详细请看http://www.cnblogs.com/dreamer-One/p/5621134.html
另外付在线加解密工具链接：http://tool.chacuo.net/cryptrsaprikey
--公钥
local RSA_PUBLIC_KEY = [[
    -----BEGIN RSA PUBLIC KEY-----
    MIGJAoGBAJ9YqFCTlhnmTYNCezMfy7yb7xwAzRinXup1Zl51517rhJq8W0wVwNt+
    mcKwRzisA1SIqPGlhiyDb2RJKc1cCNrVNfj7xxOKCIihkIsTIKXzDfeAqrm0bU80
    BSjgjj6YUKZinUAACPoao8v+QFoRlXlsAy72mY7ipVnJqBd1AOPVAgMBAAE=
    -----END RSA PUBLIC KEY-----
    ]]
--私钥
local RSA_PRIV_KEY = [[
    -----BEGIN RSA PRIVATE KEY-----
    MIICXAIBAAKBgQCfWKhQk5YZ5k2DQnszH8u8m+8cAM0Yp17qdWZedede64SavFtM
    FcDbfpnCsEc4rANUiKjxpYYsg29kSSnNXAja1TX4+8cTigiIoZCLEyCl8w33gKq5
    tG1PNAUo4I4+mFCmYp1AAAj6GqPL/kBaEZV5bAMu9pmO4qVZyagXdQDj1QIDAQAB
    AoGBAJega3lRFvHKPlP6vPTm+p2c3CiPcppVGXKNCD42f1XJUsNTHKUHxh6XF4U0
    7HC27exQpkJbOZO99g89t3NccmcZPOCCz4aN0LcKv9oVZQz3Avz6aYreSESwLPqy
    AgmJEvuVe/cdwkhjAvIcbwc4rnI3OBRHXmy2h3SmO0Gkx3D5AkEAyvTrrBxDCQeW
    S4oI2pnalHyLi1apDI/Wn76oNKW/dQ36SPcqMLTzGmdfxViUhh19ySV5id8AddbE
    /b72yQLCuwJBAMj97VFPInOwm2SaWm3tw60fbJOXxuWLC6ltEfqAMFcv94ZT/Vpg
    nv93jkF9DLQC/CWHbjZbvtYTlzpevxYL8q8CQHiAKHkcopR2475f61fXJ1coBzYo
    suAZesWHzpjLnDwkm2i9D1ix5vDTVaJ3MF/cnLVTwbChLcXJSVabDi1UrUcCQAmn
    iNq6/mCoPw6aC3X0Uc3jEIgWZktoXmsI/jAWMDw/5ZfiOO06bui+iWrD4vRSoGH9
    G2IpDgWic0Uuf+dDM6kCQF2/UbL6MZKDC4rVeFF3vJh7EScfmfssQ/eVEz637N06
    2pzSvvB4xq6Gt9VwoGVNsn5r/K6AbT+rmewW57Jo7pg=
    -----END RSA PRIVATE KEY-----
    ]]
--公钥加密
    local resty_rsa = require "resty.rsa"
    local pub, err = resty_rsa:new({ public_key = RSA_PUBLIC_KEY })
    if not pub then
        ngx.say("new rsa err: ", err)
        return
    end
    local encrypted, err = pub:encrypt("hello")
    if not encrypted then
        ngx.say("failed to encrypt: ", err)
        return
    end
    ngx.say("encrypted length: ", #encrypted)
--私钥解密
    local priv, err = resty_rsa:new({ private_key = RSA_PRIV_KEY })
    if not priv then
        ngx.say("new rsa err: ", err)
        return
    end
    local decrypted = priv:decrypt(encrypted)
    ngx.say(decrypted == "hello")
--私钥签名
    local algorithm = "SHA"
    local priv, err = resty_rsa:new({ private_key = RSA_PRIV_KEY, algorithm = algorithm })
    if not priv then
        ngx.say("new rsa err: ", err)
        return
    end

    local str = "hello"
    local sig, err = priv:sign(str)
    if not sig then
        ngx.say("failed to sign:", err)
        return
    end
    ngx.say("sig length: ", #sig)
--公钥验签
    local pub, err = resty_rsa:new({ public_key = RSA_PUBLIC_KEY, algorithm = algorithm })
    if not pub then
        ngx.say("new rsa err: ", err)
        return
    end
    local verify, err = pub:verify(str, sig)
    if not verify then
        ngx.say("verify err: ", err)
        return
    end
    ngx.say(verify)