On Feb 10, 2013, at 10:03 PM, Damien Cooke <dam...@smartphonedev.com> wrote:

> Is there any chance you could share the ComputeSHA1 message with me?  I know 
> you said it was only a wrapper for commonCrypto but I am so lost in this 
> stuff I want t check everything.

Sure; it’s pretty trivial:

typedef struct {
    uint8_t bytes[20];
} SHA1Digest;

SHA1Digest ComputeSHA1(NSData* data) {
    NSCParameterAssert(data);
    SHA1Digest digest;
    CC_SHA1(data.bytes, (CC_LONG)data.length, digest.bytes);
    return digest;
}

—Jens
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