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"""
Created on Sat Dec 14 21:40:07 2024
SHA-1 对输入的明文采用utf-8编码
对输出的密文采用十六进制编码
"""
def string_to_bitstring(s):
"""
将字符串转换为二进制位串
:param s: 输入字符串
:return: 由每个字符转换成的 8 位二进制数拼接成的字符串
"""
return ''.join(format(ord(char), '08b') for char in s)
def add_padding_bits(bitstring):
if len(bitstring) < 448:
bitstring_padding=bitstring+'1'
while len(bitstring_padding)!=448:
bitstring_padding+='0'
bitstring_hex_list=[bitstring_padding[i:i+4] for i in range(0,len(bitstring_padding),4)]
else:
print("明文字符串长度 >= 56, 尚未实现")
bitstring_hex=''.join(hex(int(x,2))[2:] for x in bitstring_hex_list)
while len(bitstring_hex)!=128:
bitstring_hex+='0'
end_padding=hex(len(bitstring))[2:]
bitstring_hex=bitstring_hex[:-len(end_padding)]+end_padding
return bitstring_hex
def circular_left_shift(x, n):
"""
对32位整数x进行n位的循环左移
:param x: 输入的整数 (8位16进制数)
:param n: 左移的位数
:return: 循环左移后的结果
"""
x_int=int(x,16)
result=((x_int << n) & 0xFFFFFFFF) | (x_int >> (32 - n))
return f"{result:08x}"
def mod32_add(x, y, z, u, k):
result = (int(x, 16) + int(y, 16) + int(z, 16) + int(u, 16) + int(k, 16)) & 0xFFFFFFFF
return f"{result:08x}"
def f1(X, Y, Z):
result = (int(X, 16) & int(Y, 16)) | ((~int(X, 16)) & int(Z, 16))
return f"{result:08x}"
def f2(X, Y, Z):
result = int(X,16) ^ int(Y,16) ^ int(Z,16)
return f"{result:08x}"
def f3(X, Y, Z):
result = (int(X,16) & int(Y,16)) | (int(X,16) & int(Z,16)) | (int(Y,16) & int(Z,16))
return f"{result:08x}"
def f4(X, Y, Z):
result = int(X,16) ^ int(Y,16) ^ int(Z,16)
return f"{result:08x}"
def sha_1_encode(bitstring_hex):
A=['67452301']
B=['EFCDAB89']
C=['98BADCFE']
D=['10325476']
E=['C3D2E1F0']
w=[bitstring_hex[i:i+8] for i in range(0,len(bitstring_hex),8)]
K=['5a827999','6ed9eba1','8f1bbcdc','ca62c1d6']
function=[f1,f2,f3,f4]
for i in range(16,80):
w_tem=''.join([hex(int(a,16) ^ int(b,16) ^ int(c,16) ^ int(d,16))[2:] for a,b,c,d in zip(w[i-16],w[i-14],w[i-8],w[i-3])])
w_tem=circular_left_shift(w_tem, 1)
w.append(w_tem)
for i in range(4):
for t in range(i*20,(i+1)*20):
A_tem=mod32_add(E[len(E)-1],function[i](B[len(B)-1],C[len(C)-1],D[len(D)-1]),circular_left_shift(A[len(A)-1], 5), w[t], K[i])
A.append(A_tem)
B.append(A[len(A)-2])
C.append(circular_left_shift(B[len(B)-2], 30))
D.append(C[len(C)-2])
E.append(D[len(D)-2])
A.append(mod32_add(A[len(A)-1], A[len(A)-81], '0', '0', '0'))
B.append(mod32_add(B[len(B)-1], B[len(B)-81], '0', '0', '0'))
C.append(mod32_add(C[len(C)-1], C[len(C)-81], '0', '0', '0'))
D.append(mod32_add(D[len(D)-1], D[len(D)-81], '0', '0', '0'))
E.append(mod32_add(E[len(E)-1], E[len(E)-81], '0', '0', '0'))
ciphertext=A[len(A)-1]+B[len(B)-1]+C[len(C)-1]+D[len(D)-1]+E[len(E)-1]
return ciphertext
def main():
while True:
print("==================== SHA-1 加密======================")
print("[1] 加密")
print("[0] 退出")
print("====================================================")
try:
choice = int(input("请输入操作选项 (0 或 1 ): "))
if choice == 0:
print("\n\n程序已退出。感谢使用 SHA-1 加密工具！")
break
elif choice == 1:
plaintext = input("请输入明文 (UTF-8 编码，目前只支持字符长度 <56): ")
bitstring = string_to_bitstring(plaintext)
bitstring_hex = add_padding_bits(bitstring)
if not plaintext:
raise ValueError("明文不能为空！")
ciphertext=sha_1_encode(bitstring_hex)
print("\n加密结果 (十六进制):")
print(ciphertext)
else:
raise ValueError("无效选项")
except ValueError as e:
print(f"输入错误: {e}")
except Exception as e:
print(f"发生错误: {e}")
if __name__=="__main__":
main()
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