找了很多地方都没有找到iOS关于哈希带密钥的加密方法，最终还是在朋友的帮助下搞定的。
-(NSString*) hmacForSecret:(NSString*)secret data:(NSString*)data {
constchar *cKey = [secretcStringUsingEncoding:NSASCIIStringEncoding];
constchar *cData = [datacStringUsingEncoding:NSUTF8StringEncoding];
unsignedchar cHMAC[CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, cKey,strlen(cKey), cData, strlen(cData), cHMAC);
NSData *HMAC = [[NSDataalloc] initWithBytes:cHMAClength:sizeof(cHMAC)];
NSString *hash = [HMAC base64EncodedString];
return hash;
}
再创建一个NSData的category类名字自己随意取
.h文件代码
void *NewBase64Decode(constchar *inputBuffer, size_t length, size_t *outputLength);
char *NewBase64Encode(constvoid *inputBuffer, size_t length, bool separateLines, size_t *outputLength);
@interface NSData (base64EncodedString)
+ (NSData *)dataFromBase64String:(NSString *)aString;
- (NSString *)base64EncodedString;
.m文件代码
static unsignedchar base64EncodeLookup[65] ="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
#define xx 65
static unsignedchar base64DecodeLookup[256] =
{
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, 62,xx, xx, xx, 63,
52, 53,54, 55, 56, 57, 58,59, 60, 61, xx, xx,xx, xx, xx, xx,
xx, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,11, 12, 13, 14,
15, 16,17, 18, 19, 20, 21,22, 23, 24, 25, xx,xx, xx, xx, xx,
xx, 26,27, 28, 29, 30, 31,32, 33, 34, 35, 36,37, 38, 39, 40,
41, 42,43, 44, 45, 46, 47,48, 49, 50, 51, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx, xx,xx, xx, xx, xx,
};
#define BINARY_UNIT_SIZE 3
#define BASE64_UNIT_SIZE 4
void *NewBase64Decode(constchar *inputBuffer, size_t length, size_t *outputLength)
{
if (length == -1)
{
length = strlen(inputBuffer);
}
size_t outputBufferSize = (length / BASE64_UNIT_SIZE) * BINARY_UNIT_SIZE;
unsigned char *outputBuffer = (unsignedchar *)malloc(outputBufferSize);
size_t i = 0;
size_t j = 0;
while (i < length)
{
unsigned char accumulated[BASE64_UNIT_SIZE];
size_t accumulateIndex = 0;
while (i < length)
{
unsigned char decode = base64DecodeLookup[inputBuffer[i++]];
if (decode != xx)
{
accumulated[accumulateIndex] = decode;
accumulateIndex++;
if (accumulateIndex == BASE64_UNIT_SIZE)
{
break;
}
}
}
//
// Store the 6 bits from each of the 4 characters as 3 bytes
//
outputBuffer[j] = (accumulated[0] << 2) | (accumulated[1] >> 4);
outputBuffer[j + 1] = (accumulated[1] <<4) | (accumulated[2] >>2);
outputBuffer[j + 2] = (accumulated[2] <<6) | accumulated[3];
j += accumulateIndex - 1;
}
if (outputLength)
{
*outputLength = j;
}
return outputBuffer;
}
char *NewBase64Encode(
const void *buffer,
size_t length,
bool separateLines,
size_t *outputLength)
{
const unsignedchar *inputBuffer = (constunsigned char *)buffer;
#define MAX_NUM_PADDING_CHARS 2
#define OUTPUT_LINE_LENGTH 64
#define INPUT_LINE_LENGTH ((OUTPUT_LINE_LENGTH / BASE64_UNIT_SIZE) * BINARY_UNIT_SIZE)
#define CR_LF_SIZE 2
size_t outputBufferSize =
((length / BINARY_UNIT_SIZE)
+ ((length % BINARY_UNIT_SIZE) ? 1 : 0))
* BASE64_UNIT_SIZE;
if (separateLines)
{
outputBufferSize +=
(outputBufferSize / OUTPUT_LINE_LENGTH) *CR_LF_SIZE;
}
outputBufferSize += 1;
char *outputBuffer = (char *)malloc(outputBufferSize);
if (!outputBuffer)
{
return NULL;
}
size_t i = 0;
size_t j = 0;
const size_t lineLength = separateLines ?INPUT_LINE_LENGTH : length;
size_t lineEnd = lineLength;
while (true)
{
if (lineEnd > length)
{
lineEnd = length;
}
for (; i + BINARY_UNIT_SIZE - 1 < lineEnd; i += BINARY_UNIT_SIZE)
{
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i] &0xFC) >> 2];
outputBuffer[j++] = base64EncodeLookup[((inputBuffer[i] &0x03) << 4)
| ((inputBuffer[i + 1] & 0xF0) >> 4)];
outputBuffer[j++] = base64EncodeLookup[((inputBuffer[i +1] & 0x0F) <<2)
| ((inputBuffer[i + 2] & 0xC0) >> 6)];
outputBuffer[j++] = base64EncodeLookup[inputBuffer[i +2] & 0x3F];
}
if (lineEnd == length)
{
break;
}
outputBuffer[j++] = '\r';
outputBuffer[j++] = '\n';
lineEnd += lineLength;
}
if (i + 1 < length)
{
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i] &0xFC) >> 2];
outputBuffer[j++] = base64EncodeLookup[((inputBuffer[i] &0x03) << 4)
| ((inputBuffer[i + 1] & 0xF0) >> 4)];
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i +1] & 0x0F) <<2];
outputBuffer[j++] = '=';
}
else if (i < length)
{
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i] &0xFC) >> 2];
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i] &0x03) << 4];
outputBuffer[j++] = '=';
outputBuffer[j++] = '=';
}
outputBuffer[j] = 0;
if (outputLength)
{
*outputLength = j;
}
return outputBuffer;
}
@implementation NSData (base64EncodedString)
+ (NSData *)dataFromBase64String:(NSString *)aString {
NSData *data = [aStringdataUsingEncoding:NSASCIIStringEncoding];
size_t outputLength;
void *outputBuffer = NewBase64Decode([data bytes], [data length], &outputLength);
NSData *result = [NSDatadataWithBytes:outputBuffer length:outputLength];
free(outputBuffer);
return result;
}
- (NSString *)base64EncodedString {
size_t outputLength;
char *outputBuffer = NewBase64Encode([self bytes], [self length], true, &outputLength);
NSString *result = [[NSStringalloc] initWithBytes:outputBufferlength:outputLength encoding:NSASCIIStringEncoding];
free(outputBuffer);
return result;
}
