ǰλãʱʱʹվLMD5,MD5ھ,MD5УMD5㷨

MD5 MD5ھ MD5У

MD5ܹ

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16λ󌑣 (p)

16λС (p)

32λ󌑣 (p)

32λС (p)

MD5㷨B??a id="sh" style="cursor:pointer;color:blue;" onclick="doit_sh('22em')">鿴ȫ
һЩʼ̎MD5512λֽM̎ݔıÿһֽMք֞1632λӷֽM㷨ݔĂ32λֽMM“γһ128λɢֵ
ϢʹLǡÞһ512λıHС64λĔ䷽Ǹһ1ϢҪĶ0Ȼ64λϢLȣǰ@ɲʹϢLǡ512λ㷨ಿҪˣͬr_ͬϢͬ
Ă32λ׃ʼ飺
A=0x01234567
B=0x89abcdef
C=0xfedcba98
D=0x76543210
Q朽׃chaining variable
M㷨ѭhѭhĴΔϢ512λϢֽMĔĿ
Ă׃Ƶe׃УAaBbCcDd
ѭh݆MD4ֻ݆ÿ݆Mһ݆M16βÿβabcdеһηǾԺ\ȻýYϵĂ׃ıһӷֽMһٌýYҭhһĔabcd֮һԓYȡabcd֮һ
һÿβõĂǾԺÿ݆һ
F(X,Y,Z)=(X&Y)|((~X)&Z)
G(X,Y,Z)=(X&Z)|(Y&(~Z))
H(X,Y,Z)=X^Y^Z
I(X,Y,Z)=Y^(X|(~Z))
?˵?amp;ǡc|ǡ~ǡǡ^ǡ򡱣
@Щ@OӋģXYZČλǪ;ôYÿһλҲǪ;
FǰλʽXôYtZHλż
OMjʾϢĵjӷֽM015<<<sʾѭhsλtķN飺
FF(a,b,c,d,Mj,s,ti)ʾa=b+((a+(F(b,c,d)+Mj+ti)<<<s)
GG(a,b,c,d,Mj,s,ti)ʾa=b+((a+(G(b,c,d)+Mj+ti)<<<s)
HH(a,b,c,d,Mj,s,ti)ʾa=b+((a+(H(b,c,d)+Mj+ti)<<<s)
II(a,b,c,d,Mj,s,ti)ʾa=b+((a+(I(b,c,d)+Mj+ti)<<<s)
@݆64ǣ
һ݆
FF(a,b,c,d,M0,7,0xd76aa478)
FF(d,a,b,c,M1,12,0xe8c7b756)
FF(c,d,a,b,M2,17,0x242070db)
FF(b,c,d,a,M3,22,0xc1bdceee)
FF(a,b,c,d,M4,7,0xf57c0faf)
FF(d,a,b,c,M5,12,0x4787c62a)
FF(c,d,a,b,M6,17,0xa8304613)
FF(b,c,d,a,M7,22,0xfd469501)
FF(a,b,c,d,M8,7,0x698098d8)
FF(d,a,b,c,M9,12,0x8b44f7af)
FF(c,d,a,b,M10,17,0xffff5bb1)
FF(b,c,d,a,M11,22,0x895cd7be)
FF(a,b,c,d,M12,7,0x6b901122)
FF(d,a,b,c,M13,12,0xfd987193)
FF(c,d,a,b,M14,17,0xa679438e)
FF(b,c,d,a,M15,22,0x49b40821)
ڶ݆
GG(a,b,c,d,M1,5,0xf61e2562)
GG(d,a,b,c,M6,9,0xc040b340)
GG(c,d,a,b,M11,14,0x265e5a51)
GG(b,c,d,a,M0,20,0xe9b6c7aa)
GG(a,b,c,d,M5,5,0xd62f105d)
GG(d,a,b,c,M10,9,0x02441453)
GG(c,d,a,b,M15,14,0xd8a1e681)
GG(b,c,d,a,M4,20,0xe7d3fbc8)
GG(a,b,c,d,M9,5,0x21e1cde6)
GG(d,a,b,c,M14,9,0xc33707d6)
GG(c,d,a,b,M3,14,0xf4d50d87)
GG(b,c,d,a,M8,20,0x455a14ed)
GG(a,b,c,d,M13,5,0xa9e3e905)
GG(d,a,b,c,M2,9,0xfcefa3f8)
GG(c,d,a,b,M7,14,0x676f02d9)
GG(b,c,d,a,M12,20,0x8d2a4c8a)
݆
HH(a,b,c,d,M5,4,0xfffa3942)
HH(d,a,b,c,M8,11,0x8771f681)
HH(c,d,a,b,M11,16,0x6d9d6122)
HH(b,c,d,a,M14,23,0xfde5380c)
HH(a,b,c,d,M1,4,0xa4beea44)
HH(d,a,b,c,M4,11,0x4bdecfa9)
HH(c,d,a,b,M7,16,0xf6bb4b60)
HH(b,c,d,a,M10,23,0xbebfbc70)
HH(a,b,c,d,M13,4,0x289b7ec6)
HH(d,a,b,c,M0,11,0xeaa127fa)
HH(c,d,a,b,M3,16,0xd4ef3085)
HH(b,c,d,a,M6,23,0x04881d05)
HH(a,b,c,d,M9,4,0xd9d4d039)
HH(d,a,b,c,M12,11,0xe6db99e5)
HH(c,d,a,b,M15,16,0x1fa27cf8)
HH(b,c,d,a,M2,23,0xc4ac5665)
݆
II(a,b,c,d,M0,6,0xf4292244)
II(d,a,b,c,M7,10,0x432aff97)
II(c,d,a,b,M14,15,0xab9423a7)
II(b,c,d,a,M5,21,0xfc93a039)
II(a,b,c,d,M12,6,0x655b59c3)
II(d,a,b,c,M3,10,0x8f0ccc92)
II(c,d,a,b,M10,15,0xffeff47d)
II(b,c,d,a,M1,21,0x85845dd1)
II(a,b,c,d,M8,6,0x6fa87e4f)
II(d,a,b,c,M15,10,0xfe2ce6e0)
II(c,d,a,b,M6,15,0xa3014314)
II(b,c,d,a,M13,21,0x4e0811a1)
II(a,b,c,d,M4,6,0xf7537e82)
II(d,a,b,c,M11,10,0xbd3af235)
II(c,d,a,b,M2,15,0x2ad7d2bb)
II(b,c,d,a,M9,21,0xeb86d391)
tix
ڵiti4294967296*abs(sin(i)),iĆλǻ(232η)
@Щ֮ABCDքeabcdȻһֽM^m\㷨ݔABCDļ“
MD5İȫMD5MD4ĸM
1˵݆
2ÿһΨһļӷ
3pڶ݆кGČQԏ(X&Y)|(X&Z)|(Y&Z)׃(X&Z)|(Y&(~Z))
4һһĽY,@ѩЧ
5׃˵ڶ݆͵݆LϢӷֽMĴ,ʹ
6ƃÿһ݆еѭhλԌFѩЧ݆λͬ
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վփռھWjІ}ՈSr“ϵվLc@oҰlϢվڵһrgM̎
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