以下を参考にコピペしただけ HMAC-sha1 hexdigest http://stackoverflow.com/questions/756492/objective-c-sample-code-for-hmac-sha1 http://stackoverflow.com/questions/735714/iphone-and-hmac-sha-1-encoding ruby のコードとハッシュ値を比較して確認した。 http://ruby-doc.org/stdlib-1.9.3/libdoc/digest/rdoc/Digest/HMAC.html

hmacsha1hexdigest.m

#import <CommonCrypto/CommonDigest.h>
#import <CommonCrypto/CommonHMAC.h>

+ (NSString*)hmacsha1Hexdigest:(NSString*)data key:(NSString*)key
{
    const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
    const char *cData = [data cStringUsingEncoding:NSUTF8StringEncoding];

    uint8_t digest[CC_SHA1_DIGEST_LENGTH] = {0};
    CCHmac(kCCHmacAlgSHA1, cKey, strlen(cKey), cData, strlen(cData), digest);

    NSData *out = [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
    NSString *hash = [out description];
    hash = [hash stringByReplacingOccurrencesOfString:@" " withString:@""];
    hash = [hash stringByReplacingOccurrencesOfString:@"<" withString:@""];
    hash = [hash stringByReplacingOccurrencesOfString:@">" withString:@""];
    return hash;
}