python 中将字符串加载为公钥

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示例：

import base64
import rsa


def strkey(strk):
    b_str = base64.b64decode(strk)

    if len(b_str) < 162:
        return False

    hex_str = ''

    # 按位转换成16进制
    for x in b_str:
        h = hex(ord(x))[2:]
        h = h.rjust(2, '0')
        hex_str += h

    # 找到模数和指数的开头结束位置
    m_start = 29 * 2
    e_start = 159 * 2
    m_len = 128 * 2
    e_len = 3 * 2

    modulus = hex_str[m_start:m_start + m_len]
    exponent = hex_str[e_start:e_start + e_len]

    return modulus, exponent


if __name__ == '__main__':
    pub_str = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDPg0O4rPQJL1O+jqJ4rBjFVNRAuDmBSoii9pYfPQBaescCVY0irkWWoLyfTT65TjvnPpOx+IfNzBTlB13qCEFm7algREoeUHjFgFNHiXJ2LK/R0+VWgXe5+EDFfbrFCPnmLKG3OcKDGQszP0VOf6VVTM1t56CpgaRMm1/+Tzd2TQIDAQAB"
    modulus, exponent = strkey(pub_str)
    modulus = int(modulus, 16)
    exponent = int(exponent, 16)
    pub_key = rsa.PublicKey(modulus, exponent)
    print pub_key