这是从 pgp 密钥中提取算法特定值的正确方法吗？我有一个奇怪的问题，除了 DSA 和 ElGamal 的最后一个值之外的所有值都可以正确提取，这会弄乱我程序的其余部分
def algorithm(data, pka):
#data is a large binary string with the algorithm specific values,
#along with the rest of the data
# MPI is defined as: 2 byte showing how many bits the value is + the value
if pka in [pub[1], pub[2], pub[3]]: # the 3 different RSA values/types
'''MPI of RSA public modulus n'''
# I havent actually used this part of the code yet
length = int(data[:16], 2) # get the length of the value in bits
n = int(data[16:16 + length], 2) # get the value
data = data[16 + length:] # remove the MPI from the data
'''MPI of RSA public modulus e'''
length = int(data[:16], 2)
e = int(data[16:16 + length], 2)
data = data[16 + length:]
temp = [n, e]
elif pka == 'DSA':
'''MPI of DSA prime p'''
length = int(data[:16], 2)
p = int(data[16:16 + length], 2)
data = data[16 + length:]
'''MPI of DSA group order q (q is a prime divisor of p-1)'''
length = int(data[:16], 2)
q = int(data[16:16 + length], 2)
data = data[16 + length:]
'''MPI of DSA group generator g'''
length = int(data[:16], 2)
g = int(data[16:16 + length], 2)
data = data[16 + length:]
'''MPI of DSA public-key value y (= g**x mod p where x is secret)'''
length = int(data[:16], 2)
y = int(data[16:16 + length], 2)
data = data[16 + length:]
temp = [p, q, g, y]
elif pka == 'Elgamal (Encrypt-Only)':
'''MPI of Elgamal prime p'''
length = int(data[:16], 2)
p = int(data[16:16 + length], 2)
data = data[16 + length:]
'''MPI of Elgamal group generator g'''
length = int(data[:16], 2)
g = int(data[16:16 + length], 2)
data = data[16 + length:]
'''MPI of Elgamal public key value y (= g**x mod p where x
is secret)'''
length = int(data[:16], 2)
y = int(data[16:16 + length], 2)
data = data[16 + length:]
temp = [p, g, y]
return data, temp
例如：我有一个从网上某处获得的密钥，其中的数据（从 pgpdump.net 转储）为：
Old: Public Subkey Packet(tag 14)(525 bytes) Ver 4 - new Public key creation time - Sat Oct 24 20:28:43 UTC 1998 Pub alg - ElGamal Encrypt-Only(pub 16) ElGamal p(2048 bits) - ... ElGamal g(2 bits) - ... ElGamal y(2044 bits) - ...
我会得到除了 y 之外的所有东西，这会弄乱我的程序的其余部分。我得到的 y 长度是 2079，这是没有意义的，因为其他一切都是正确的，但是当我查看二进制数据时，程序并没有读错，所以我不知道我的编程哪里出错了。
有任何想法吗？