不可逆(hash算法) md5, sha256 ...
对称加密 des, 3des，aes ...
非对称加密 rsa ...
1. aes 加密：
CCCrypt(kCCEncrypt,
kCCAlgorithmAES128,
kCCOptionPKCS7Padding,
vkey,
kCCKeySizeAES128,
vinitVec,
vplainText,
plainTextBufferSize,
(void*)bufferPtr,
bufferPtrSize,
&movedBytes);
aes 解密：
CCCrypt(kCCDecrypt,
kCCAlgorithmAES128,
kCCOptionPKCS7Padding,
vkey,
kCCKeySizeAES128,
vinitVec,
vplainText,
plainTextBufferSize,
(void*)bufferPtr,
bufferPtrSize,
&movedBytes);
2. 3des 加密：
CCCrypt(kCCEncrypt,
kCCAlgorithm3DES,
kCCOptionPKCS7Padding,
vkey,
kCCKeySize3DES,
vinitVec,
vplainText,
plainTextBufferSize,
(void*)bufferPtr,
bufferPtrSize,
&movedBytes);
3des 解密：
CCCrypt(kCCDecrypt,
kCCAlgorithm3DES,
kCCOptionPKCS7Padding,
vkey,
kCCKeySize3DES,
vinitVec,
vplainText,
plainTextBufferSize,
(void*)bufferPtr,
bufferPtrSize,
&movedBytes)
3. sha256 :
constchar*cstr = [str UTF8String];
unsignedchardigest[CC_SHA256_DIGEST_LENGTH];
CC_SHA256(cstr, strlen(cstr), digest);
NSMutableString* result = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH *2];
for(inti =0; i < CC_SHA256_DIGEST_LENGTH; i++) {
[result appendFormat:@"%02x", digest[i]];
}
returnresult;
4. md5：
constchar*cStr = [selfUTF8String];
unsignedcharresult[16];
CC_MD5(cStr, (unsignedint)strlen(cStr), result);
return[[NSStringstringWithFormat:
@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
result[0], result[1], result[2], result[3],
result[4], result[5], result[6], result[7],
result[8], result[9], result[10], result[11],
result[12], result[13], result[14], result[15]]lowercaseString];
