[英]Objective c RSA with OAEP padding sha256 prior ios 10
我正在使用RSA加密方法在iPhone中使用加密方法,到目前為止,我可以通過此方法獲得加密字符串,該字符串由服務器成功解密。
SecKeyRef keyRef = [self addPublicKey:pubKey];
SecKeyAlgorithm algorithm = kSecKeyAlgorithmRSAEncryptionOAEPSHA256;
if (!keyRef) {
return nil;
}
BOOL canEncrypt = SecKeyIsAlgorithmSupported(keyRef, kSecKeyOperationTypeEncrypt, algorithm);
if (canEncrypt) {
CFErrorRef error = NULL;
NSData *encryptedData = (NSData *)CFBridgingRelease(
SecKeyCreateEncryptedData(keyRef, algorithm, (__bridge CFDataRef) content, &error)
);
if (encryptedData) {
return encryptedData;
}else{
NSError *err = CFBridgingRelease(error);
NSLog(@"Ocurrió un error %@", err.localizedDescription);
return nil;
}
}
這個方法適用於ios 10和更新版本,我需要知道如何在以前的ios版本中設置算法,我的代碼是以下
SecKeyRef keyRef = [self addPublicKey:pubKey];
if (!keyRef) {
return nil;
}
size_t cipherBufferSize = SecKeyGetBlockSize(keyRef);
uint8_t *cipherBuffer = malloc(cipherBufferSize * sizeof(uint8_t));
memset((void *)cipherBuffer, 0*0, cipherBufferSize);
NSData *plainTextBytes = content;
size_t blockSize = cipherBufferSize - 11;
size_t blockCount = (size_t)ceil([plainTextBytes length] / (double)blockSize);
NSMutableData *encryptedData = [NSMutableData dataWithCapacity:0];
for (int i=0; i<blockCount; i++) {
int bufferSize = (int)MIN(blockSize,[plainTextBytes length] - i * blockSize);
NSData *buffer = [plainTextBytes subdataWithRange:NSMakeRange(i * blockSize, bufferSize)];
OSStatus status = SecKeyEncrypt(keyRef,
kSecPaddingOAEP,
(const uint8_t *)[buffer bytes],
[buffer length],
cipherBuffer,
&cipherBufferSize);
if (status == noErr){
NSData *encryptedBytes = [NSData dataWithBytes:(const void *)cipherBuffer length:cipherBufferSize];
[encryptedData appendData:encryptedBytes];
}else{
if (cipherBuffer) {
free(cipherBuffer);
}
return nil;
}
}
if (cipherBuffer) free(cipherBuffer);
到目前為止,我可以看到在ios 10的版本中,您可以使用此行設置算法
SecKeyAlgorithm algorithm = kSecKeyAlgorithmRSAEncryptionOAEPSHA256;
我的問題是,如何在早期版本的ios中獲得該算法,我發布的第二個代碼無法解密。
謝謝你的幫助
如果使用帶有SecKeyEncrypt
OAEP填充,則只能使用kSecPaddingOAEP
,即SHA1。 遺憾的是,您不能將OAEP SHA256與SecKeyEncrypt
一起SecKeyEncrypt
。
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